From 443245280f6fc4f962bcdba1d529b3707e13c13a Mon Sep 17 00:00:00 2001 From: or-else Date: Sun, 20 Dec 2020 12:14:42 -0800 Subject: [PATCH] rebuild with sdk changes --- umd/tinode.dev.js | 4 +++- umd/tinode.prod.js | 2 +- 2 files changed, 4 insertions(+), 2 deletions(-) diff --git a/umd/tinode.dev.js b/umd/tinode.dev.js index 95976eca..27a193d9 100644 --- a/umd/tinode.dev.js +++ b/umd/tinode.dev.js @@ -6668,6 +6668,7 @@ TopicMe.prototype = Object.create(Topic.prototype, { if (sub.deleted) { cont = sub; delete this._contacts[topicName]; + this._tinode.cacheDel('topic', topicName); } else { // Ensure the values are defined and are integers. if (typeof sub.seq != 'undefined') { @@ -6836,6 +6837,7 @@ TopicMe.prototype = Object.create(Topic.prototype, { break; case 'gone': // topic deleted or unsubscribed from delete this._contacts[pres.src]; + this._tinode.cacheDel('topic', pres.src); break; case 'del': // Update topic.del value. @@ -7571,4 +7573,4 @@ module.exports={"version": "0.16.9-rc2"} },{}]},{},[2])(2) }); -//# 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r(e,n,t){function o(i,f){if(!n[i]){if(!e[i]){var c=\"function\"==typeof require&&require;if(!f&&c)return c(i,!0);if(u)return u(i,!0);var a=new Error(\"Cannot find module '\"+i+\"'\");throw a.code=\"MODULE_NOT_FOUND\",a}var p=n[i]={exports:{}};e[i][0].call(p.exports,function(r){var n=e[i][1][r];return o(n||r)},p,p.exports,r,e,n,t)}return n[i].exports}for(var u=\"function\"==typeof require&&require,i=0;i<t.length;i++)o(t[i]);return o}return r})()","/**\n * @copyright 2015-2019 Tinode\n * @summary Minimally rich text representation and formatting for Tinode.\n * @license Apache 2.0\n * @version 0.16\n *\n * @file Basic parser and formatter for very simple text markup. Mostly targeted at\n * mobile use cases similar to Telegram, WhatsApp, and FB Messenger.\n *\n * <p>Supports conversion of user keyboard input to formatted text:</p>\n * <ul>\n *   <li>*abc* &rarr; <b>abc</b></li>\n *   <li>_abc_ &rarr; <i>abc</i></li>\n *   <li>~abc~ &rarr; <del>abc</del></li>\n *   <li>`abc` &rarr; <tt>abc</tt></li>\n * </ul>\n * Also supports forms and buttons.\n *\n * Nested formatting is supported, e.g. *abc _def_* -> <b>abc <i>def</i></b>\n * URLs, @mentions, and #hashtags are extracted and converted into links.\n * Forms and buttons can be added procedurally.\n * JSON data representation is inspired by Draft.js raw formatting.\n *\n *\n * @example\n * Text:\n * <pre>\n *     this is *bold*, `code` and _italic_, ~strike~\n *     combined *bold and _italic_*\n *     an url: https://www.example.com/abc#fragment and another _www.tinode.co_\n *     this is a @mention and a #hashtag in a string\n *     second #hashtag\n * </pre>\n *\n *  Sample JSON representation of the text above:\n *  {\n *     \"txt\": \"this is bold, code and italic, strike combined bold and italic an url: https://www.example.com/abc#fragment \" +\n *             \"and another www.tinode.co this is a @mention and a #hashtag in a string second #hashtag\",\n *     \"fmt\": [\n *         { \"at\":8, \"len\":4,\"tp\":\"ST\" },{ \"at\":14, \"len\":4, \"tp\":\"CO\" },{ \"at\":23, \"len\":6, \"tp\":\"EM\"},\n *         { \"at\":31, \"len\":6, \"tp\":\"DL\" },{ \"tp\":\"BR\", \"len\":1, \"at\":37 },{ \"at\":56, \"len\":6, \"tp\":\"EM\" },\n *         { \"at\":47, \"len\":15, \"tp\":\"ST\" },{ \"tp\":\"BR\", \"len\":1, \"at\":62 },{ \"at\":120, \"len\":13, \"tp\":\"EM\" },\n *         { \"at\":71, \"len\":36, \"key\":0 },{ \"at\":120, \"len\":13, \"key\":1 },{ \"tp\":\"BR\", \"len\":1, \"at\":133 },\n *         { \"at\":144, \"len\":8, \"key\":2 },{ \"at\":159, \"len\":8, \"key\":3 },{ \"tp\":\"BR\", \"len\":1, \"at\":179 },\n *         { \"at\":187, \"len\":8, \"key\":3 },{ \"tp\":\"BR\", \"len\":1, \"at\":195 }\n *     ],\n *     \"ent\": [\n *         { \"tp\":\"LN\", \"data\":{ \"url\":\"https://www.example.com/abc#fragment\" } },\n *         { \"tp\":\"LN\", \"data\":{ \"url\":\"http://www.tinode.co\" } },\n *         { \"tp\":\"MN\", \"data\":{ \"val\":\"mention\" } },\n *         { \"tp\":\"HT\", \"data\":{ \"val\":\"hashtag\" } }\n *     ]\n *  }\n */\n\n'use strict';\n\nconst MAX_FORM_ELEMENTS = 8;\nconst JSON_MIME_TYPE = 'application/json';\n\n// Regular expressions for parsing inline formats. Javascript does not support lookbehind,\n// so it's a bit messy.\nconst INLINE_STYLES = [\n  // Strong = bold, *bold text*\n  {\n    name: 'ST',\n    start: /(?:^|[\\W_])(\\*)[^\\s*]/,\n    end: /[^\\s*](\\*)(?=$|[\\W_])/\n  },\n  // Emphesized = italic, _italic text_\n  {\n    name: 'EM',\n    start: /(?:^|\\W)(_)[^\\s_]/,\n    end: /[^\\s_](_)(?=$|\\W)/\n  },\n  // Deleted, ~strike this though~\n  {\n    name: 'DL',\n    start: /(?:^|[\\W_])(~)[^\\s~]/,\n    end: /[^\\s~](~)(?=$|[\\W_])/\n  },\n  // Code block `this is monospace`\n  {\n    name: 'CO',\n    start: /(?:^|\\W)(`)[^`]/,\n    end: /[^`](`)(?=$|\\W)/\n  }\n];\n\n// RegExps for entity extraction (RF = reference)\nconst ENTITY_TYPES = [\n  // URLs\n  {\n    name: 'LN',\n    dataName: 'url',\n    pack: function(val) {\n      // Check if the protocol is specified, if not use http\n      if (!/^[a-z]+:\\/\\//i.test(val)) {\n        val = 'http://' + val;\n      }\n      return {\n        url: val\n      };\n    },\n    re: /(?:(?:https?|ftp):\\/\\/|www\\.|ftp\\.)[-A-Z0-9+&@#\\/%=~_|$?!:,.]*[A-Z0-9+&@#\\/%=~_|$]/ig\n  },\n  // Mentions @user (must be 2 or more characters)\n  {\n    name: 'MN',\n    dataName: 'val',\n    pack: function(val) {\n      return {\n        val: val.slice(1)\n      };\n    },\n    re: /\\B@(\\w\\w+)/g\n  },\n  // Hashtags #hashtag, like metion 2 or more characters.\n  {\n    name: 'HT',\n    dataName: 'val',\n    pack: function(val) {\n      return {\n        val: val.slice(1)\n      };\n    },\n    re: /\\B#(\\w\\w+)/g\n  }\n];\n\n// HTML tag name suggestions\nconst HTML_TAGS = {\n  ST: {\n    name: 'b',\n    isVoid: false\n  },\n  EM: {\n    name: 'i',\n    isVoid: false\n  },\n  DL: {\n    name: 'del',\n    isVoid: false\n  },\n  CO: {\n    name: 'tt',\n    isVoid: false\n  },\n  BR: {\n    name: 'br',\n    isVoid: true\n  },\n  LN: {\n    name: 'a',\n    isVoid: false\n  },\n  MN: {\n    name: 'a',\n    isVoid: false\n  },\n  HT: {\n    name: 'a',\n    isVoid: false\n  },\n  IM: {\n    name: 'img',\n    isVoid: true\n  },\n  FM: {\n    name: 'div',\n    isVoid: false\n  },\n  RW: {\n    name: 'div',\n    isVoid: false,\n  },\n  BN: {\n    name: 'button',\n    isVoid: false\n  },\n  HD: {\n    name: '',\n    isVoid: false\n  }\n};\n\n// Convert base64-encoded string into Blob.\nfunction base64toObjectUrl(b64, contentType) {\n  if (!b64) {\n    return null;\n  }\n\n  try {\n    const bin = atob(b64);\n    const length = bin.length;\n    const buf = new ArrayBuffer(length);\n    const arr = new Uint8Array(buf);\n    for (let i = 0; i < length; i++) {\n      arr[i] = bin.charCodeAt(i);\n    }\n\n    return URL.createObjectURL(new Blob([buf], {\n      type: contentType\n    }));\n  } catch (err) {\n    console.log(\"Drafty: failed to convert object.\", err.message);\n  }\n\n  return null;\n}\n\nfunction base64toDataUrl(b64, contentType) {\n  if (!b64) {\n    return null;\n  }\n  contentType = contentType || 'image/jpeg';\n  return 'data:' + contentType + ';base64,' + b64;\n}\n\n// Helpers for converting Drafty to HTML.\nconst DECORATORS = {\n  // Visial styles\n  ST: {\n    open: function() {\n      return '<b>';\n    },\n    close: function() {\n      return '</b>';\n    }\n  },\n  EM: {\n    open: function() {\n      return '<i>';\n    },\n    close: function() {\n      return '</i>'\n    }\n  },\n  DL: {\n    open: function() {\n      return '<del>';\n    },\n    close: function() {\n      return '</del>'\n    }\n  },\n  CO: {\n    open: function() {\n      return '<tt>';\n    },\n    close: function() {\n      return '</tt>'\n    }\n  },\n  // Line break\n  BR: {\n    open: function() {\n      return '<br/>';\n    },\n    close: function() {\n      return ''\n    }\n  },\n  // Hidden element\n  HD: {\n    open: function() {\n      return '';\n    },\n    close: function() {\n      return '';\n    }\n  },\n  // Link (URL)\n  LN: {\n    open: function(data) {\n      return '<a href=\"' + data.url + '\">';\n    },\n    close: function(data) {\n      return '</a>';\n    },\n    props: function(data) {\n      return data ? {\n        href: data.url,\n        target: \"_blank\"\n      } : null;\n    },\n  },\n  // Mention\n  MN: {\n    open: function(data) {\n      return '<a href=\"#' + data.val + '\">';\n    },\n    close: function(data) {\n      return '</a>';\n    },\n    props: function(data) {\n      return data ? {\n        name: data.val\n      } : null;\n    },\n  },\n  // Hashtag\n  HT: {\n    open: function(data) {\n      return '<a href=\"#' + data.val + '\">';\n    },\n    close: function(data) {\n      return '</a>';\n    },\n    props: function(data) {\n      return data ? {\n        name: data.val\n      } : null;\n    },\n  },\n  // Button\n  BN: {\n    open: function(data) {\n      return '<button>';\n    },\n    close: function(data) {\n      return '</button>';\n    },\n    props: function(data) {\n      return data ? {\n        'data-act': data.act,\n        'data-val': data.val,\n        'data-name': data.name,\n        'data-ref': data.ref\n      } : null;\n    },\n  },\n  // Image\n  IM: {\n    open: function(data) {\n      // Don't use data.ref for preview: it's a security risk.\n      const tmpPreviewUrl = base64toDataUrl(data._tempPreview, data.mime);\n      const previewUrl = base64toObjectUrl(data.val, data.mime);\n      const downloadUrl = data.ref || previewUrl;\n      return (data.name ? '<a href=\"' + downloadUrl + '\" download=\"' + data.name + '\">' : '') +\n        '<img src=\"' + (tmpPreviewUrl || previewUrl) + '\"' +\n        (data.width ? ' width=\"' + data.width + '\"' : '') +\n        (data.height ? ' height=\"' + data.height + '\"' : '') + ' border=\"0\" />';\n    },\n    close: function(data) {\n      return (data.name ? '</a>' : '');\n    },\n    props: function(data) {\n      if (!data) return null;\n      return {\n        // Temporary preview, or permanent preview, or external link.\n        src: base64toDataUrl(data._tempPreview, data.mime) ||\n          data.ref || base64toObjectUrl(data.val, data.mime),\n        title: data.name,\n        'data-width': data.width,\n        'data-height': data.height,\n        'data-name': data.name,\n        'data-size': data.val ? ((data.val.length * 0.75) | 0) : (data.size | 0),\n        'data-mime': data.mime\n      };\n    },\n  },\n  // Form - structured layout of elements.\n  FM: {\n    open: function(data) {\n      return '<div>';\n    },\n    close: function(data) {\n      return '</div>';\n    }\n  },\n  // Row: logic grouping of elements\n  RW: {\n    open: function(data) {\n      return '<div>';\n    },\n    close: function(data) {\n      return '</div>';\n    }\n  }\n};\n\n/**\n * The main object which performs all the formatting actions.\n * @class Drafty\n * @constructor\n */\nvar Drafty = function() {}\n\n// Take a string and defined earlier style spans, re-compose them into a tree where each leaf is\n// a same-style (including unstyled) string. I.e. 'hello *bold _italic_* and ~more~ world' ->\n// ('hello ', (b: 'bold ', (i: 'italic')), ' and ', (s: 'more'), ' world');\n//\n// This is needed in order to clear markup, i.e. 'hello *world*' -> 'hello world' and convert\n// ranges from markup-ed offsets to plain text offsets.\nfunction chunkify(line, start, end, spans) {\n  const chunks = [];\n\n  if (spans.length == 0) {\n    return [];\n  }\n\n  for (let i in spans) {\n    // Get the next chunk from the queue\n    const span = spans[i];\n\n    // Grab the initial unstyled chunk\n    if (span.start > start) {\n      chunks.push({\n        text: line.slice(start, span.start)\n      });\n    }\n\n    // Grab the styled chunk. It may include subchunks.\n    const chunk = {\n      type: span.type\n    };\n    const chld = chunkify(line, span.start + 1, span.end, span.children);\n    if (chld.length > 0) {\n      chunk.children = chld;\n    } else {\n      chunk.text = span.text;\n    }\n    chunks.push(chunk);\n    start = span.end + 1; // '+1' is to skip the formatting character\n  }\n\n  // Grab the remaining unstyled chunk, after the last span\n  if (start < end) {\n    chunks.push({\n      text: line.slice(start, end)\n    });\n  }\n\n  return chunks;\n}\n\n// Inverse of chunkify. Returns a tree of formatted spans.\nfunction forEach(line, start, end, spans, formatter, context) {\n  const result = [];\n\n  // Process ranges calling formatter for each range.\n  for (let i = 0; i < spans.length; i++) {\n    const span = spans[i];\n    if (span.at < 0) {\n      // throw out non-visual spans.\n      continue;\n    }\n    // Add un-styled range before the styled span starts.\n    if (start < span.at) {\n      result.push(formatter.call(context, null, undefined, line.slice(start, span.at), result.length));\n      start = span.at;\n    }\n    // Get all spans which are within current span.\n    const subspans = [];\n    for (let si = i + 1; si < spans.length && spans[si].at < span.at + span.len; si++) {\n      subspans.push(spans[si]);\n      i = si;\n    }\n\n    const tag = HTML_TAGS[span.tp] || {}\n    result.push(formatter.call(context, span.tp, span.data,\n      tag.isVoid ? null : forEach(line, start, span.at + span.len, subspans, formatter, context),\n      result.length));\n\n    start = span.at + span.len;\n  }\n\n  // Add the last unformatted range.\n  if (start < end) {\n    result.push(formatter.call(context, null, undefined, line.slice(start, end), result.length));\n  }\n\n  return result;\n}\n\n// Detect starts and ends of formatting spans. Unformatted spans are\n// ignored at this stage.\nfunction spannify(original, re_start, re_end, type) {\n  const result = [];\n  let index = 0;\n  let line = original.slice(0); // make a copy;\n\n  while (line.length > 0) {\n    // match[0]; // match, like '*abc*'\n    // match[1]; // match captured in parenthesis, like 'abc'\n    // match['index']; // offset where the match started.\n\n    // Find the opening token.\n    const start = re_start.exec(line);\n    if (start == null) {\n      break;\n    }\n\n    // Because javascript RegExp does not support lookbehind, the actual offset may not point\n    // at the markup character. Find it in the matched string.\n    let start_offset = start['index'] + start[0].lastIndexOf(start[1]);\n    // Clip the processed part of the string.\n    line = line.slice(start_offset + 1);\n    // start_offset is an offset within the clipped string. Convert to original index.\n    start_offset += index;\n    // Index now point to the beginning of 'line' within the 'original' string.\n    index = start_offset + 1;\n\n    // Find the matching closing token.\n    const end = re_end ? re_end.exec(line) : null;\n    if (end == null) {\n      break;\n    }\n    let end_offset = end['index'] + end[0].indexOf(end[1]);\n    // Clip the processed part of the string.\n    line = line.slice(end_offset + 1);\n    // Update offsets\n    end_offset += index;\n    // Index now point to the beginning of 'line' within the 'original' string.\n    index = end_offset + 1;\n\n    result.push({\n      text: original.slice(start_offset + 1, end_offset),\n      children: [],\n      start: start_offset,\n      end: end_offset,\n      type: type\n    });\n  }\n\n  return result;\n}\n\n// Convert linear array or spans into a tree representation.\n// Keep standalone and nested spans, throw away partially overlapping spans.\nfunction toTree(spans) {\n  if (spans.length == 0) {\n    return [];\n  }\n\n  const tree = [spans[0]];\n  let last = spans[0];\n  for (let i = 1; i < spans.length; i++) {\n    // Keep spans which start after the end of the previous span or those which\n    // are complete within the previous span.\n\n    if (spans[i].start > last.end) {\n      // Span is completely outside of the previous span.\n      tree.push(spans[i]);\n      last = spans[i];\n    } else if (spans[i].end < last.end) {\n      // Span is fully inside of the previous span. Push to subnode.\n      last.children.push(spans[i]);\n    }\n    // Span could partially overlap, ignoring it as invalid.\n  }\n\n  // Recursively rearrange the subnodes.\n  for (let i in tree) {\n    tree[i].children = toTree(tree[i].children);\n  }\n\n  return tree;\n}\n\n// Get a list of entities from a text.\nfunction extractEntities(line) {\n  let match;\n  let extracted = [];\n  ENTITY_TYPES.map(function(entity) {\n    while ((match = entity.re.exec(line)) !== null) {\n      extracted.push({\n        offset: match['index'],\n        len: match[0].length,\n        unique: match[0],\n        data: entity.pack(match[0]),\n        type: entity.name\n      });\n    }\n  });\n\n  if (extracted.length == 0) {\n    return extracted;\n  }\n\n  // Remove entities detected inside other entities, like #hashtag in a URL.\n  extracted.sort(function(a, b) {\n    return a.offset - b.offset;\n  });\n\n  let idx = -1;\n  extracted = extracted.filter(function(el) {\n    const result = (el.offset > idx);\n    idx = el.offset + el.len;\n    return result;\n  });\n\n  return extracted;\n}\n\n// Convert the chunks into format suitable for serialization.\nfunction draftify(chunks, startAt) {\n  let plain = \"\";\n  let ranges = [];\n  for (let i in chunks) {\n    const chunk = chunks[i];\n    if (!chunk.text) {\n      const drafty = draftify(chunk.children, plain.length + startAt);\n      chunk.text = drafty.txt;\n      ranges = ranges.concat(drafty.fmt);\n    }\n\n    if (chunk.type) {\n      ranges.push({\n        at: plain.length + startAt,\n        len: chunk.text.length,\n        tp: chunk.type\n      });\n    }\n\n    plain += chunk.text;\n  }\n  return {\n    txt: plain,\n    fmt: ranges\n  };\n}\n\n// Splice two strings: insert second string into the first one at the given index\nfunction splice(src, at, insert) {\n  return src.slice(0, at) + insert + src.slice(at);\n}\n\n/**\n * Parse plain text into Drafty document.\n * @memberof Drafty\n * @static\n *\n * @param {String} content plain-text content to parse.\n * @return {Drafty} parsed object or null if the source is not plain text.\n */\nDrafty.parse = function(content) {\n  // Make sure we are parsing strings only.\n  if (typeof content != 'string') {\n    return null;\n  }\n\n  // Split text into lines. It makes further processing easier.\n  const lines = content.split(/\\r?\\n/);\n\n  // Holds entities referenced from text\n  const entityMap = [];\n  const entityIndex = {};\n\n  // Processing lines one by one, hold intermediate result in blx.\n  const blx = [];\n  lines.map(function(line) {\n    let spans = [];\n    let entities;\n\n    // Find formatted spans in the string.\n    // Try to match each style.\n    INLINE_STYLES.map(function(style) {\n      // Each style could be matched multiple times.\n      spans = spans.concat(spannify(line, style.start, style.end, style.name));\n    });\n\n    let block;\n    if (spans.length == 0) {\n      block = {\n        txt: line\n      };\n    } else {\n      // Sort spans by style occurence early -> late\n      spans.sort(function(a, b) {\n        return a.start - b.start;\n      });\n\n      // Convert an array of possibly overlapping spans into a tree\n      spans = toTree(spans);\n\n      // Build a tree representation of the entire string, not\n      // just the formatted parts.\n      const chunks = chunkify(line, 0, line.length, spans);\n\n      const drafty = draftify(chunks, 0);\n\n      block = {\n        txt: drafty.txt,\n        fmt: drafty.fmt\n      };\n    }\n\n    // Extract entities from the cleaned up string.\n    entities = extractEntities(block.txt);\n    if (entities.length > 0) {\n      const ranges = [];\n      for (let i in entities) {\n        // {offset: match['index'], unique: match[0], len: match[0].length, data: ent.packer(), type: ent.name}\n        const entity = entities[i];\n        let index = entityIndex[entity.unique];\n        if (!index) {\n          index = entityMap.length;\n          entityIndex[entity.unique] = index;\n          entityMap.push({\n            tp: entity.type,\n            data: entity.data\n          });\n        }\n        ranges.push({\n          at: entity.offset,\n          len: entity.len,\n          key: index\n        });\n      }\n      block.ent = ranges;\n    }\n\n    blx.push(block);\n  });\n\n  const result = {\n    txt: \"\"\n  };\n\n  // Merge lines and save line breaks as BR inline formatting.\n  if (blx.length > 0) {\n    result.txt = blx[0].txt;\n    result.fmt = (blx[0].fmt || []).concat(blx[0].ent || []);\n\n    for (let i = 1; i < blx.length; i++) {\n      const block = blx[i];\n      const offset = result.txt.length + 1;\n\n      result.fmt.push({\n        tp: 'BR',\n        len: 1,\n        at: offset - 1\n      });\n\n      result.txt += \" \" + block.txt;\n      if (block.fmt) {\n        result.fmt = result.fmt.concat(block.fmt.map(function(s) {\n          s.at += offset;\n          return s;\n        }));\n      }\n      if (block.ent) {\n        result.fmt = result.fmt.concat(block.ent.map(function(s) {\n          s.at += offset;\n          return s;\n        }));\n      }\n    }\n\n    if (result.fmt.length == 0) {\n      delete result.fmt;\n    }\n\n    if (entityMap.length > 0) {\n      result.ent = entityMap;\n    }\n  }\n  return result;\n}\n\n/**\n * Initialize Drafty document to a plain text string.\n *\n * @param {String} plainText string to use as Drafty content.\n *\n * @returns new Drafty document or null is plainText is not a string.\n */\nDrafty.init = function(plainText) {\n  if (typeof plainText != 'string') {\n    return null;\n  }\n  return {\n    txt: plainText\n  };\n}\n\n/**\n * Append one Drafty document to another.\n *\n * @param {Drafty} first Drafty document to append to.\n * @param {Drafty} second Drafty document being appended.\n *\n * @return {Drafty} first document with the second appended to it.\n */\nDrafty.append = function(first, second) {\n  if (first == null) {\n    return second;\n  }\n  if (second == null) {\n    return first;\n  }\n\n  first.txt = first.txt || '';\n  second.txt = second.txt || '';\n  const len = first.txt.length;\n\n  first.txt += second.txt;\n  if (Array.isArray(second.fmt)) {\n    first.fmt = first.fmt || [];\n    if (Array.isArray(second.ent)) {\n      first.ent = first.ent || [];\n    }\n    second.fmt.forEach(src => {\n      const fmt = {\n        at: src.at + len,\n        len: src.len\n      };\n      if (src.tp) {\n        fmt.tp = src.tp;\n      } else {\n        fmt.key = first.ent.length;\n        first.ent.push(second.ent[src.key || 0]);\n      }\n      first.fmt.push(fmt);\n    });\n  }\n\n  return first;\n}\n\n/**\n * @typedef Drafty.ImageDesc\n * @memberof Drafty\n * @type Object\n * @param {string} mime mime-type of the image, e.g. \"image/png\"\n * @param {string} preview base64-encoded image content (or preview, if large image is attached). Could be null/undefined.\n * @param {integer} width width of the image\n * @param {integer} height height of the image\n * @param {string} filename file name suggestion for downloading the image.\n * @param {integer} size size of the image in bytes. Treat is as an untrusted hint.\n * @param {string} refurl reference to the content. Could be null/undefined.\n * @param {string} _tempPreview base64-encoded image preview used during upload process; not serializable.\n * @param {Promise} urlPromise Promise which returns content URL when resolved.\n */\n\n/**\n * Insert inline image into Drafty document.\n * @memberof Drafty\n * @static\n *\n * @param {Drafty} content object to add image to.\n * @param {integer} at index where the object is inserted. The length of the image is always 1.\n * @param {ImageDesc} imageDesc object with image paramenets and data.\n *\n * @return {Drafty} updated content.\n */\nDrafty.insertImage = function(content, at, imageDesc) {\n  content = content || {\n    txt: \" \"\n  };\n  content.ent = content.ent || [];\n  content.fmt = content.fmt || [];\n\n  content.fmt.push({\n    at: at,\n    len: 1,\n    key: content.ent.length\n  });\n\n  const ex = {\n    tp: 'IM',\n    data: {\n      mime: imageDesc.mime,\n      val: imageDesc.preview,\n      width: imageDesc.width,\n      height: imageDesc.height,\n      name: imageDesc.filename,\n      size: imageDesc.size | 0,\n      ref: imageDesc.refurl\n    }\n  };\n\n  if (imageDesc.urlPromise) {\n    ex.data._tempPreview = imageDesc._tempPreview;\n    ex.data._processing = true;\n    imageDesc.urlPromise.then(\n      (url) => {\n        ex.data.ref = url;\n        ex.data._tempPreview = undefined;\n        ex.data._processing = undefined;\n      },\n      (err) => {\n        /* catch the error, otherwise it will appear in the console. */\n        ex.data._processing = undefined;\n      }\n    );\n  }\n\n  content.ent.push(ex);\n\n  return content;\n}\n\n/**\n * Append inline image to Drafty content.\n * @memberof Drafty\n * @static\n *\n * @param {Drafty} content object to add image to.\n * @param {ImageDesc} imageDesc object with image paramenets.\n *\n * @return {Drafty} updated content.\n */\nDrafty.appendImage = function(content, imageDesc) {\n  content = content || {\n    txt: \"\"\n  };\n  content.txt += \" \";\n  return Drafty.insertImage(content, content.txt.length - 1, imageDesc);\n}\n\n/**\n * @typedef Drafty.AttachmentDesc\n * @memberof Drafty\n * @type Object\n * @param {string} mime mime-type of the image, e.g. \"image/png\"\n * @param {string} data base64-encoded in-band content of small attachments. Could be null/undefined.\n * @param {string} filename file name suggestion for downloading the attachment.\n * @param {integer} size size of the file in bytes. Treat is as an untrusted hint.\n * @param {string} refurl reference to the out-of-band content. Could be null/undefined.\n * @param {Promise} urlPromise Promise which returns content URL when resolved.\n */\n\n/**\n * Attach file to Drafty content. Either as a blob or as a reference.\n * @memberof Drafty\n * @static\n *\n * @param {Drafty} content object to attach file to.\n * @param {AttachmentDesc} object containing attachment description and data.\n *\n * @return {Drafty} updated content.\n */\nDrafty.attachFile = function(content, attachmentDesc) {\n  content = content || {\n    txt: \"\"\n  };\n  content.ent = content.ent || [];\n  content.fmt = content.fmt || [];\n\n  content.fmt.push({\n    at: -1,\n    len: 0,\n    key: content.ent.length\n  });\n\n  const ex = {\n    tp: 'EX',\n    data: {\n      mime: attachmentDesc.mime,\n      val: attachmentDesc.data,\n      name: attachmentDesc.filename,\n      ref: attachmentDesc.refurl,\n      size: attachmentDesc.size | 0\n    }\n  }\n  if (attachmentDesc.urlPromise) {\n    ex.data._processing = true;\n    attachmentDesc.urlPromise.then(\n      (url) => {\n        ex.data.ref = url;\n        ex.data._processing = undefined;\n      },\n      (err) => {\n        /* catch the error, otherwise it will appear in the console. */\n        ex.data._processing = undefined;\n      }\n    );\n  }\n  content.ent.push(ex);\n\n  return content;\n}\n\n/**\n * Wraps content into an interactive form.\n * @memberof Drafty\n * @static\n *\n * @param {Drafty|string} content to wrap into a form.\n * @param {number} at index where the forms starts.\n * @param {number} len length of the form content.\n *\n * @return {Drafty} updated content.\n */\nDrafty.wrapAsForm = function(content, at, len) {\n  if (typeof content == 'string') {\n    content = {\n      txt: content\n    };\n  }\n  content.fmt = content.fmt || [];\n\n  content.fmt.push({\n    at: at,\n    len: len,\n    tp: 'FM'\n  });\n\n  return content;\n}\n\n/**\n * Insert clickable button into Drafty document.\n * @memberof Drafty\n * @static\n *\n * @param {Drafty|string} content is Drafty object to insert button to or a string to be used as button text.\n * @param {number} at is location where the button is inserted.\n * @param {number} len is the length of the text to be used as button title.\n * @param {string} name of the button. Client should return it to the server when the button is clicked.\n * @param {string} actionType is the type of the button, one of 'url' or 'pub'.\n * @param {string} actionValue is the value to return on click:\n * @param {string} refUrl is the URL to go to when the 'url' button is clicked.\n *\n * @return {Drafty} updated content.\n */\nDrafty.insertButton = function(content, at, len, name, actionType, actionValue, refUrl) {\n  if (typeof content == 'string') {\n    content = {\n      txt: content\n    };\n  }\n\n  if (!content || !content.txt || content.txt.length < at + len) {\n    return null;\n  }\n\n  if (len <= 0 || ['url', 'pub'].indexOf(actionType) == -1) {\n    return null;\n  }\n  // Ensure refUrl is a string.\n  if (actionType == 'url' && !refUrl) {\n    return null;\n  }\n  refUrl = '' + refUrl;\n\n  content.ent = content.ent || [];\n  content.fmt = content.fmt || [];\n\n  content.fmt.push({\n    at: at,\n    len: len,\n    key: content.ent.length\n  });\n  content.ent.push({\n    tp: 'BN',\n    data: {\n      act: actionType,\n      val: actionValue,\n      ref: refUrl,\n      name: name\n    }\n  });\n\n  return content;\n}\n\n/**\n * Append clickable button to Drafty document.\n * @memberof Drafty\n * @static\n *\n * @param {Drafty|string} content is Drafty object to insert button to or a string to be used as button text.\n * @param {string} title is the text to be used as button title.\n * @param {string} name of the button. Client should return it to the server when the button is clicked.\n * @param {string} actionType is the type of the button, one of 'url' or 'pub'.\n * @param {string} actionValue is the value to return on click:\n * @param {string} refUrl is the URL to go to when the 'url' button is clicked.\n *\n * @return {Drafty} updated content.\n */\nDrafty.appendButton = function(content, title, name, actionType, actionValue, refUrl) {\n  content = content || {\n    txt: \"\"\n  };\n  const at = content.txt.length;\n  content.txt += title;\n  return Drafty.insertButton(content, at, title.length, name, actionType, actionValue, refUrl);\n}\n\n/**\n * Attach a generic JS object. The object is attached as a json string.\n * Intended for representing a form response.\n *\n * @memberof Drafty\n * @static\n *\n * @param {Drafty} content object to attach file to.\n * @param {Object} data to convert to json string and attach.\n */\nDrafty.attachJSON = function(content, data) {\n  content = content || {\n    txt: \"\"\n  };\n  content.ent = content.ent || [];\n  content.fmt = content.fmt || [];\n\n  content.fmt.push({\n    at: -1,\n    len: 0,\n    key: content.ent.length\n  });\n\n  content.ent.push({\n    tp: 'EX',\n    data: {\n      mime: JSON_MIME_TYPE,\n      val: data\n    }\n  });\n\n  return content;\n}\n\nDrafty.appendLineBreak = function(content) {\n  content = content || {\n    txt: \"\"\n  };\n  content.fmt = content.fmt || [];\n  content.fmt.push({\n    at: content.txt.length,\n    len: 1,\n    tp: 'BR'\n  });\n  content.txt += \" \";\n\n  return content;\n}\n/**\n * Given the structured representation of rich text, convert it to HTML.\n * No attempt is made to strip pre-existing html markup.\n * This is potentially unsafe because `content.txt` may contain malicious\n * markup.\n * @memberof Tinode.Drafty\n * @static\n *\n * @param {drafy} content - structured representation of rich text.\n *\n * @return HTML-representation of content.\n */\nDrafty.UNSAFE_toHTML = function(content) {\n  let {\n    txt,\n    fmt,\n    ent\n  } = content;\n\n  const markup = [];\n  if (fmt) {\n    for (let i in fmt) {\n      const range = fmt[i];\n      let tp = range.tp;\n      let data;\n      if (!tp) {\n        const entity = ent[range.key | 0];\n        if (entity) {\n          tp = entity.tp;\n          data = entity.data;\n        }\n      }\n\n      if (DECORATORS[tp]) {\n        // Because we later sort in descending order, closing markup must come first.\n        // Otherwise zero-length objects will not be represented correctly.\n        markup.push({\n          idx: range.at + range.len,\n          len: -range.len,\n          what: DECORATORS[tp].close(data)\n        });\n        markup.push({\n          idx: range.at,\n          len: range.len,\n          what: DECORATORS[tp].open(data)\n        });\n      }\n    }\n  }\n\n  markup.sort(function(a, b) {\n    return b.idx == a.idx ? b.len - a.len : b.idx - a.idx; // in descending order\n  });\n\n  for (let i in markup) {\n    if (markup[i].what) {\n      txt = splice(txt, markup[i].idx, markup[i].what);\n    }\n  }\n\n  return txt;\n}\n\n/**\n * Callback for applying custom formatting/transformation to a Drafty object.\n * Called once for each syle span.\n * @memberof Drafty\n * @static\n *\n * @callback Formatter\n * @param {string} style style code such as \"ST\" or \"IM\".\n * @param {Object} data entity's data\n * @param {Object} values possibly styled subspans contained in this style span.\n * @param {number} index of the current element among its siblings.\n */\n\n/**\n * Transform Drafty using custom formatting.\n * @memberof Drafty\n * @static\n *\n * @param {Drafty} content - content to transform.\n * @param {Formatter} formatter - callback which transforms individual elements\n * @param {Object} context - context provided to formatter as 'this'.\n *\n * @return {Object} transformed object\n */\nDrafty.format = function(content, formatter, context) {\n  let {\n    txt,\n    fmt,\n    ent\n  } = content;\n\n  // Assign default values.\n  txt = txt || \"\";\n  if (!Array.isArray(ent)) {\n    ent = [];\n  }\n\n  if (!Array.isArray(fmt)) {\n    // Handle special case when all values in fmt are 0 and fmt is skipped.\n    if (ent.length == 1) {\n      fmt = [{\n        at: 0,\n        len: 0,\n        key: 0\n      }];\n    } else {\n      return [txt];\n    }\n  }\n\n  let spans = [].concat(fmt);\n\n  // Zero values may have been stripped. Restore them.\n  // Also ensure indexes and lengths are sane.\n  spans.map(function(s) {\n    s.at = s.at || 0;\n    s.len = s.len || 0;\n    if (s.len < 0) {\n      s.len = 0;\n    }\n    if (s.at < -1) {\n      s.at = -1;\n    }\n  });\n\n  // Sort spans first by start index (asc) then by length (desc).\n  spans.sort(function(a, b) {\n    if (a.at - b.at == 0) {\n      return b.len - a.len; // longer one comes first (<0)\n    }\n    return a.at - b.at;\n  });\n\n  // Denormalize entities into spans. Create a copy of the objects to leave\n  // original Drafty object unchanged.\n  spans = spans.map((s) => {\n    let data;\n    let tp = s.tp;\n    if (!tp) {\n      s.key = s.key || 0;\n      if (ent[s.key]) {\n        data = ent[s.key].data;\n        tp = ent[s.key].tp;\n      }\n    }\n\n    // Type still not defined? Hide invalid element.\n    tp = tp || 'HD';\n\n    return {\n      tp: tp,\n      data: data,\n      at: s.at,\n      len: s.len\n    };\n  });\n\n  return forEach(txt, 0, txt.length, spans, formatter, context);\n}\n\n/**\n * Given structured representation of rich text, convert it to plain text.\n * @memberof Drafty\n * @static\n *\n * @param {Drafty} content - content to convert to plain text.\n */\nDrafty.toPlainText = function(content) {\n  return typeof content == 'string' ? content : content.txt;\n}\n\n/**\n * Returns true if content has no markup and no entities.\n * @memberof Drafty\n * @static\n *\n * @param {Drafty} content - content to check for presence of markup.\n * @returns true is content is plain text, false otherwise.\n */\nDrafty.isPlainText = function(content) {\n  return typeof content == 'string' || !(content.fmt || content.ent);\n}\n\n/**\n * Checks if the object represets is a valid Drafty document.\n * @memberof Drafty\n * @static\n *\n * @param {Drafty} content - content to check for validity.\n * @returns true is content is valid, false otherwise.\n */\nDrafty.isValid = function(content) {\n  if (!content) {\n    return false;\n  }\n\n  const {\n    txt,\n    fmt,\n    ent\n  } = content;\n\n  if (!txt && txt !== '' && !fmt && !ent) {\n    return false;\n  }\n\n  const txt_type = typeof txt;\n  if (txt_type != 'string' && txt_type != 'undefined' && txt !== null) {\n    return false;\n  }\n\n  if (typeof fmt != 'undefined' && !Array.isArray(fmt) && fmt !== null) {\n    return false;\n  }\n\n  if (typeof ent != 'undefined' && !Array.isArray(ent) && ent !== null) {\n    return false;\n  }\n  return true;\n}\n\n/**\n * Check if the drafty content has attachments.\n * @memberof Drafty\n * @static\n *\n * @param {Drafty} content - content to check for attachments.\n * @returns true if there are attachments.\n */\nDrafty.hasAttachments = function(content) {\n  if (content.ent && content.ent.length > 0) {\n    for (let i in content.ent) {\n      if (content.ent[i] && content.ent[i].tp == 'EX') {\n        return true;\n      }\n    }\n  }\n  return false;\n}\n\n/**\n * Callback for applying custom formatting/transformation to a Drafty object.\n * Called once for each syle span.\n * @memberof Drafty\n * @static\n *\n * @callback AttachmentCallback\n * @param {Object} data attachment data\n * @param {number} index attachment's index in `content.ent`.\n */\n\n/**\n * Enumerate attachments.\n * @memberof Drafty\n * @static\n *\n * @param {Drafty} content - drafty object to process for attachments.\n * @param {AttachmentCallback} callback - callback to call for each attachment.\n * @param {Object} context - value of \"this\" for callback.\n */\nDrafty.attachments = function(content, callback, context) {\n  if (content.ent && content.ent.length > 0) {\n    for (let i in content.ent) {\n      if (content.ent[i] && content.ent[i].tp == 'EX') {\n        callback.call(context, content.ent[i].data, i);\n      }\n    }\n  }\n}\n\n/**\n * Given the entity, get URL which can be used for downloading\n * entity data.\n * @memberof Drafty\n * @static\n *\n * @param {Object} entity.data to get the URl from.\n */\nDrafty.getDownloadUrl = function(entData) {\n  let url = null;\n  if (entData.mime != JSON_MIME_TYPE && entData.val) {\n    url = base64toObjectUrl(entData.val, entData.mime);\n  } else if (typeof entData.ref == 'string') {\n    url = entData.ref;\n  }\n  return url;\n}\n\n/**\n * Check if the entity data is not ready for sending, such as being uploaded to the server.\n * @memberof Drafty\n * @static\n *\n * @param {Object} entity.data to get the URl from.\n * @returns {boolean} true if upload is in progress, false otherwise.\n */\nDrafty.isProcessing = function(entData) {\n  return !!entData._processing;\n}\n\n/**\n * Given the entity, get URL which can be used for previewing\n * the entity.\n * @memberof Drafty\n * @static\n *\n * @param {Object} entity.data to get the URl from.\n *\n * @returns {string} url for previewing or null if no such url is available.\n */\nDrafty.getPreviewUrl = function(entData) {\n  return entData.val ? base64toObjectUrl(entData.val, entData.mime) : null;\n}\n\n/**\n * Get approximate size of the entity.\n * @memberof Drafty\n * @static\n *\n * @param {Object} entity.data to get the size for.\n */\nDrafty.getEntitySize = function(entData) {\n  // Either size hint or length of value. The value is base64 encoded,\n  // the actual object size is smaller than the encoded length.\n  return entData.size ? entData.size : entData.val ? (entData.val.length * 0.75) | 0 : 0;\n}\n\n/**\n * Get entity mime type.\n * @memberof Drafty\n * @static\n *\n * @param {Object} entity.data to get the type for.\n */\nDrafty.getEntityMimeType = function(entData) {\n  return entData.mime || 'text/plain';\n}\n\n/**\n * Get HTML tag for a given two-letter style name\n * @memberof Drafty\n * @static\n *\n * @param {string} style - two-letter style, like ST or LN\n *\n * @returns {string} tag name\n */\nDrafty.tagName = function(style) {\n  return HTML_TAGS[style] ? HTML_TAGS[style].name : undefined;\n}\n\n/**\n * For a given data bundle generate an object with HTML attributes,\n * for instance, given {url: \"http://www.example.com/\"} return\n * {href: \"http://www.example.com/\"}\n * @memberof Drafty\n * @static\n *\n * @param {string} style - two-letter style to generate attributes for.\n * @param {Object} data - data bundle to convert to attributes\n *\n * @returns {Object} object with HTML attributes.\n */\nDrafty.attrValue = function(style, data) {\n  if (data && DECORATORS[style]) {\n    return DECORATORS[style].props(data);\n  }\n\n  return undefined;\n}\n\n/**\n * Drafty MIME type.\n * @memberof Drafty\n * @static\n *\n * @returns {string} HTTP Content-Type \"text/x-drafty\".\n */\nDrafty.getContentType = function() {\n  return 'text/x-drafty';\n}\n\nif (typeof module != 'undefined') {\n  module.exports = Drafty;\n}\n","/**\n * @file SDK to connect to Tinode chat server.\n * See <a href=\"https://github.com/tinode/webapp\">\n * https://github.com/tinode/webapp</a> for real-life usage.\n *\n * @copyright 2015-2019 Tinode\n * @summary Javascript bindings for Tinode.\n * @license Apache 2.0\n * @version 0.16\n *\n * @example\n * <head>\n * <script src=\".../tinode.js\"></script>\n * </head>\n *\n * <body>\n *  ...\n * <script>\n *  // Instantiate tinode.\n *  const tinode = new Tinode(APP_NAME, HOST, API_KEY, null, true);\n *  tinode.enableLogging(true);\n *  // Add logic to handle disconnects.\n *  tinode.onDisconnect = function(err) { ... };\n *  // Connect to the server.\n *  tinode.connect().then(() => {\n *    // Connected. Login now.\n *    return tinode.loginBasic(login, password);\n *  }).then((ctrl) => {\n *    // Logged in fine, attach callbacks, subscribe to 'me'.\n *    const me = tinode.getMeTopic();\n *    me.onMetaDesc = function(meta) { ... };\n *    // Subscribe, fetch topic description and the list of contacts.\n *    me.subscribe({get: {desc: {}, sub: {}});\n *  }).catch((err) => {\n *    // Login or subscription failed, do something.\n *    ...\n *  });\n *  ...\n * </script>\n * </body>\n */\n'use strict';\n\n// NOTE TO DEVELOPERS:\n// Localizable strings should be double quoted \"строка на другом языке\",\n// non-localizable strings should be single quoted 'non-localized'.\n\nif (typeof require == 'function') {\n  if (typeof Drafty == 'undefined') {\n    var Drafty = require('./drafty.js');\n  }\n  var package_version = require('../version.json').version;\n}\n\nlet WebSocketProvider;\nif (typeof WebSocket != 'undefined') {\n  WebSocketProvider = WebSocket;\n}\n\nlet XHRProvider;\nif (typeof XMLHttpRequest != 'undefined') {\n  XHRProvider = XMLHttpRequest;\n}\ninitForNonBrowserApp();\n\n// Global constants\nconst PROTOCOL_VERSION = '0';\nconst VERSION = package_version || '0.16';\nconst LIBRARY = 'tinodejs/' + VERSION;\n\nconst TOPIC_NEW = 'new';\nconst TOPIC_NEW_CHAN = 'nch';\nconst TOPIC_ME = 'me';\nconst TOPIC_FND = 'fnd';\nconst TOPIC_SYS = 'sys';\nconst TOPIC_CHAN = 'chn';\nconst USER_NEW = 'new';\n\n// Starting value of a locally-generated seqId used for pending messages.\nconst LOCAL_SEQID = 0xFFFFFFF;\n\nconst MESSAGE_STATUS_NONE = 0; // Status not assigned.\nconst MESSAGE_STATUS_QUEUED = 1; // Local ID assigned, in progress to be sent.\nconst MESSAGE_STATUS_SENDING = 2; // Transmission started.\nconst MESSAGE_STATUS_FAILED = 3; // At least one attempt was made to send the message.\nconst MESSAGE_STATUS_SENT = 4; // Delivered to the server.\nconst MESSAGE_STATUS_RECEIVED = 5; // Received by the client.\nconst MESSAGE_STATUS_READ = 6; // Read by the user.\nconst MESSAGE_STATUS_TO_ME = 7; // Message from another user.\n\n// Error code to return in case of a network problem.\nconst NETWORK_ERROR = 503;\nconst NETWORK_ERROR_TEXT = \"Connection failed\";\n\n// Reject unresolved futures after this many milliseconds.\nconst EXPIRE_PROMISES_TIMEOUT = 5000;\n// Periodicity of garbage collection of unresolved futures.\nconst EXPIRE_PROMISES_PERIOD = 1000;\n\n// Error code to return when user disconnected from server.\nconst NETWORK_USER = 418;\nconst NETWORK_USER_TEXT = \"Disconnected by client\";\n\n// Utility functions\n\n// Add brower missing function for non browser app, eg nodeJs\nfunction initForNonBrowserApp() {\n  // Tinode requirement in native mode because react native doesn't provide Base64 method\n  const chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=';\n\n  if (typeof btoa == 'undefined') {\n    const chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=';\n    global.btoa = function(input = '') {\n      let str = input;\n      let output = '';\n\n      for (let block = 0, charCode, i = 0, map = chars; str.charAt(i | 0) || (map = '=', i % 1); output += map.charAt(63 & block >> 8 - i % 1 * 8)) {\n\n        charCode = str.charCodeAt(i += 3 / 4);\n\n        if (charCode > 0xFF) {\n          throw new Error(\"'btoa' failed: The string to be encoded contains characters outside of the Latin1 range.\");\n        }\n\n        block = block << 8 | charCode;\n      }\n\n      return output;\n    };\n  }\n\n  if (typeof atob == 'undefined') {\n    global.atob = function(input = '') {\n      let str = input.replace(/=+$/, '');\n      let output = '';\n\n      if (str.length % 4 == 1) {\n        throw new Error(\"'atob' failed: The string to be decoded is not correctly encoded.\");\n      }\n      for (let bc = 0, bs = 0, buffer, i = 0; buffer = str.charAt(i++);\n\n        ~buffer && (bs = bc % 4 ? bs * 64 + buffer : buffer,\n          bc++ % 4) ? output += String.fromCharCode(255 & bs >> (-2 * bc & 6)) : 0\n      ) {\n        buffer = chars.indexOf(buffer);\n      }\n\n      return output;\n    };\n  }\n\n  if (typeof window == 'undefined') {\n    global.window = {\n      WebSocket: WebSocketProvider,\n      XMLHttpRequest: XHRProvider,\n      URL: {\n        createObjectURL: function() {\n          throw new Error(\"Unable to use URL.createObjectURL in a non-browser application\");\n        }\n      }\n    }\n  }\n}\n\n// RFC3339 formater of Date\nfunction rfc3339DateString(d) {\n  if (!d || d.getTime() == 0) {\n    return undefined;\n  }\n\n  function pad(val, sp) {\n    sp = sp || 2;\n    return '0'.repeat(sp - ('' + val).length) + val;\n  }\n\n  const millis = d.getUTCMilliseconds();\n  return d.getUTCFullYear() + '-' + pad(d.getUTCMonth() + 1) + '-' + pad(d.getUTCDate()) +\n    'T' + pad(d.getUTCHours()) + ':' + pad(d.getUTCMinutes()) + ':' + pad(d.getUTCSeconds()) +\n    (millis ? '.' + pad(millis, 3) : '') + 'Z';\n}\n\n// btoa replacement. Stock btoa fails on on non-Latin1 strings.\nfunction b64EncodeUnicode(str) {\n  // The encodeURIComponent percent-encodes UTF-8 string,\n  // then the percent encoding is converted into raw bytes which\n  // can be fed into btoa.\n  return btoa(encodeURIComponent(str).replace(/%([0-9A-F]{2})/g,\n    function toSolidBytes(match, p1) {\n      return String.fromCharCode('0x' + p1);\n    }));\n}\n\n// Recursively merge src's own properties to dst.\n// Ignore properties where ignore[property] is true.\n// Array and Date objects are shallow-copied.\nfunction mergeObj(dst, src, ignore) {\n  if (typeof src != 'object') {\n    if (src === Tinode.DEL_CHAR) {\n      return undefined;\n    }\n    if (src === undefined) {\n      return dst;\n    }\n    return src;\n  }\n  // JS is crazy: typeof null is 'object'.\n  if (src === null) {\n    return src;\n  }\n\n  // Handle Date\n  if (src instanceof Date) {\n    return (!dst || !(dst instanceof Date) || dst < src) ? src : dst;\n  }\n\n  // Access mode\n  if (src instanceof AccessMode) {\n    return new AccessMode(src);\n  }\n\n  // Handle Array\n  if (src instanceof Array) {\n    return src;\n  }\n\n  if (!dst || dst === Tinode.DEL_CHAR) {\n    dst = src.constructor();\n  }\n\n  for (let prop in src) {\n    if (src.hasOwnProperty(prop) &&\n      (!ignore || !ignore[prop]) &&\n      (prop != '_noForwarding')) {\n\n      dst[prop] = mergeObj(dst[prop], src[prop]);\n    }\n  }\n  return dst;\n}\n\n// Update object stored in a cache. Returns updated value.\nfunction mergeToCache(cache, key, newval, ignore) {\n  cache[key] = mergeObj(cache[key], newval, ignore);\n  return cache[key];\n}\n\nfunction stringToDate(obj) {\n  if (typeof obj.created == 'string') {\n    obj.created = new Date(obj.created);\n  }\n  if (typeof obj.updated == 'string') {\n    obj.updated = new Date(obj.updated);\n  }\n  if (typeof obj.touched == 'string') {\n    obj.touched = new Date(obj.touched);\n  }\n}\n\n// JSON stringify helper - pre-processor for JSON.stringify\nfunction jsonBuildHelper(key, val) {\n  if (val instanceof Date) {\n    // Convert javascript Date objects to rfc3339 strings\n    val = rfc3339DateString(val);\n  } else if (val instanceof AccessMode) {\n    val = val.jsonHelper();\n  } else if (val === undefined || val === null || val === false ||\n    (Array.isArray(val) && val.length == 0) ||\n    ((typeof val == 'object') && (Object.keys(val).length == 0))) {\n    // strip out empty elements while serializing objects to JSON\n    return undefined;\n  }\n\n  return val;\n};\n\n// Strips all values from an object of they evaluate to false or if their name starts with '_'.\nfunction simplify(obj) {\n  Object.keys(obj).forEach(function(key) {\n    if (key[0] == '_') {\n      // Strip fields like \"obj._key\".\n      delete obj[key];\n    } else if (!obj[key]) {\n      // Strip fields which evaluate to false.\n      delete obj[key];\n    } else if (Array.isArray(obj[key]) && obj[key].length == 0) {\n      // Strip empty arrays.\n      delete obj[key];\n    } else if (!obj[key]) {\n      // Strip fields which evaluate to false.\n      delete obj[key];\n    } else if (typeof obj[key] == 'object' && !(obj[key] instanceof Date)) {\n      simplify(obj[key]);\n      // Strip empty objects.\n      if (Object.getOwnPropertyNames(obj[key]).length == 0) {\n        delete obj[key];\n      }\n    }\n  });\n  return obj;\n};\n\n// Trim whitespace, strip empty and duplicate elements elements.\n// If the result is an empty array, add a single element \"\\u2421\" (Unicode Del character).\nfunction normalizeArray(arr) {\n  let out = [];\n  if (Array.isArray(arr)) {\n    // Trim, throw away very short and empty tags.\n    for (let i = 0, l = arr.length; i < l; i++) {\n      let t = arr[i];\n      if (t) {\n        t = t.trim().toLowerCase();\n        if (t.length > 1) {\n          out.push(t);\n        }\n      }\n    }\n    out.sort().filter(function(item, pos, ary) {\n      return !pos || item != ary[pos - 1];\n    });\n  }\n  if (out.length == 0) {\n    // Add single tag with a Unicode Del character, otherwise an ampty array\n    // is ambiguos. The Del tag will be stripped by the server.\n    out.push(Tinode.DEL_CHAR);\n  }\n  return out;\n}\n\n// Attempt to convert date strings to objects.\nfunction jsonParseHelper(key, val) {\n  // Convert string timestamps with optional milliseconds to Date\n  // 2015-09-02T01:45:43[.123]Z\n  if (key === 'ts' && typeof val === 'string' &&\n    val.length >= 20 && val.length <= 24) {\n    let date = new Date(val);\n    if (date) {\n      return date;\n    }\n  } else if (key === 'acs' && typeof val === 'object') {\n    return new AccessMode(val);\n  }\n  return val;\n};\n\n// Trims very long strings (encoded images) to make logged packets more readable.\nfunction jsonLoggerHelper(key, val) {\n  if (typeof val == 'string' && val.length > 128) {\n    return '<' + val.length + ', bytes: ' + val.substring(0, 12) + '...' + val.substring(val.length - 12) + '>';\n  }\n  return jsonBuildHelper(key, val);\n};\n\n// Parse browser user agent to extract browser name and version.\nfunction getBrowserInfo(ua, product) {\n  ua = ua || '';\n  let reactnative = '';\n  // Check if this is a ReactNative app.\n  if (/reactnative/i.test(product)) {\n    reactnative = 'ReactNative; ';\n  }\n  // Then test for WebKit based browser.\n  ua = ua.replace(' (KHTML, like Gecko)', '');\n  let m = ua.match(/(AppleWebKit\\/[.\\d]+)/i);\n  let result;\n  if (m) {\n    // List of common strings, from more useful to less useful.\n    let priority = ['chrome', 'safari', 'mobile', 'version'];\n    let tmp = ua.substr(m.index + m[0].length).split(\" \");\n    let tokens = [];\n    // Split Name/0.0.0 into Name and version 0.0.0\n    for (let i = 0; i < tmp.length; i++) {\n      let m2 = /([\\w.]+)[\\/]([\\.\\d]+)/.exec(tmp[i]);\n      if (m2) {\n        tokens.push([m2[1], m2[2], priority.findIndex(function(e) {\n          return (e == m2[1].toLowerCase());\n        })]);\n      }\n    }\n    // Sort by priority: more interesting is earlier than less interesting.\n    tokens.sort(function(a, b) {\n      let diff = a[2] - b[2];\n      return diff != 0 ? diff : b[0].length - a[0].length;\n    });\n    if (tokens.length > 0) {\n      // Return the least common browser string and version.\n      result = tokens[0][0] + '/' + tokens[0][1];\n    } else {\n      // Failed to ID the browser. Return the webkit version.\n      result = m[1];\n    }\n    // Test for MSIE.\n  } else if (/trident/i.test(ua)) {\n    m = /(?:\\brv[ :]+([.\\d]+))|(?:\\bMSIE ([.\\d]+))/g.exec(ua);\n    if (m) {\n      result = 'MSIE/' + (m[1] || m[2]);\n    } else {\n      result = 'MSIE/?';\n    }\n    // Test for Firefox.\n  } else if (/firefox/i.test(ua)) {\n    m = /Firefox\\/([.\\d]+)/g.exec(ua);\n    if (m) {\n      result = 'Firefox/' + m[1];\n    } else {\n      result = 'Firefox/?';\n    }\n    // Older Opera.\n  } else if (/presto/i.test(ua)) {\n    m = /Opera\\/([.\\d]+)/g.exec(ua);\n    if (m) {\n      result = 'Opera/' + m[1];\n    } else {\n      result = 'Opera/?';\n    }\n  } else {\n    // Failed to parse anything meaningfull. Try the last resort.\n    m = /([\\w.]+)\\/([.\\d]+)/.exec(ua);\n    if (m) {\n      result = m[1] + '/' + m[2];\n    } else {\n      m = ua.split(' ');\n      result = m[0];\n    }\n  }\n\n  // Shorten the version to one dot 'a.bb.ccc.d -> a.bb' at most.\n  m = result.split('/');\n  if (m.length > 1) {\n    let v = m[1].split('.');\n    result = m[0] + '/' + v[0] + (v[1] ? '.' + v[1] : '');\n  }\n  return reactnative + result;\n}\n\n/**\n * In-memory sorted cache of objects.\n *\n * @class CBuffer\n * @memberof Tinode\n * @protected\n *\n * @param {function} compare custom comparator of objects. Returns -1 if a < b, 0 if a == b, 1 otherwise.\n * @param {boolean} unique enforce element uniqueness: replace existing element with a new one on conflict.\n */\nvar CBuffer = function(compare, unique) {\n  let buffer = [];\n\n  compare = compare || function(a, b) {\n    return a === b ? 0 : a < b ? -1 : 1;\n  };\n\n  function findNearest(elem, arr, exact) {\n    let start = 0;\n    let end = arr.length - 1;\n    let pivot = 0;\n    let diff = 0;\n    let found = false;\n\n    while (start <= end) {\n      pivot = (start + end) / 2 | 0;\n      diff = compare(arr[pivot], elem);\n      if (diff < 0) {\n        start = pivot + 1;\n      } else if (diff > 0) {\n        end = pivot - 1;\n      } else {\n        found = true;\n        break;\n      }\n    }\n    if (found) {\n      return {\n        idx: pivot,\n        exact: true\n      };\n    }\n    if (exact) {\n      return {\n        idx: -1\n      };\n    }\n    // Not exact - insertion point\n    return {\n      idx: diff < 0 ? pivot + 1 : pivot\n    };\n  }\n\n  // Insert element into a sorted array.\n  function insertSorted(elem, arr) {\n    const found = findNearest(elem, arr, false);\n    const count = (found.exact && unique) ? 1 : 0;\n    arr.splice(found.idx, count, elem);\n    return arr;\n  }\n\n  return {\n    /**\n     * Get an element at the given position.\n     * @memberof Tinode.CBuffer#\n     * @param {number} at - Position to fetch from.\n     * @returns {Object} Element at the given position or <tt>undefined</tt>\n     */\n    getAt: function(at) {\n      return buffer[at];\n    },\n\n    /**\n     * Convenience method for getting the last element of the buffer.\n     * @memberof Tinode.CBuffer#\n     * @returns {Object} The last element in the buffer or <tt>undefined</tt> if buffer is empty.\n     */\n    getLast: function() {\n      return buffer.length > 0 ? buffer[buffer.length - 1] : undefined;\n    },\n\n    /** Add new element(s) to the buffer. Variadic: takes one or more arguments. If an array is passed as a single\n     * argument, its elements are inserted individually.\n     * @memberof Tinode.CBuffer#\n     *\n     * @param {...Object|Array} - One or more objects to insert.\n     */\n    put: function() {\n      let insert;\n      // inspect arguments: if array, insert its elements, if one or more non-array arguments, insert them one by one\n      if (arguments.length == 1 && Array.isArray(arguments[0])) {\n        insert = arguments[0];\n      } else {\n        insert = arguments;\n      }\n      for (let idx in insert) {\n        insertSorted(insert[idx], buffer);\n      }\n    },\n\n    /**\n     * Remove element at the given position.\n     * @memberof Tinode.CBuffer#\n     * @param {number} at - Position to delete at.\n     * @returns {Object} Element at the given position or <tt>undefined</tt>\n     */\n    delAt: function(at) {\n      let r = buffer.splice(at, 1);\n      if (r && r.length > 0) {\n        return r[0];\n      }\n      return undefined;\n    },\n\n    /**\n     * Remove elements between two positions.\n     * @memberof Tinode.CBuffer#\n     * @param {number} since - Position to delete from (inclusive).\n     * @param {number} before - Position to delete to (exclusive).\n     *\n     * @returns {Array} array of removed elements (could be zero length).\n     */\n    delRange: function(since, before) {\n      return buffer.splice(since, before - since);\n    },\n\n    /**\n     * Return the number of elements the buffer holds.\n     * @memberof Tinode.CBuffer#\n     * @return {number} Number of elements in the buffer.\n     */\n    length: function() {\n      return buffer.length;\n    },\n\n    /**\n     * Reset the buffer discarding all elements\n     * @memberof Tinode.CBuffer#\n     */\n    reset: function() {\n      buffer = [];\n    },\n\n    /**\n     * Callback for iterating contents of buffer. See {@link Tinode.CBuffer#forEach}.\n     * @callback ForEachCallbackType\n     * @memberof Tinode.CBuffer#\n     * @param {Object} elem - Element of the buffer.\n     * @param {number} index - Index of the current element.\n     */\n\n    /**\n     * Apply given function `callback` to all elements of the buffer.\n     * @memberof Tinode.CBuffer#\n     *\n     * @param {Tinode.ForEachCallbackType} callback - Function to call for each element.\n     * @param {integer} startIdx - Optional index to start iterating from (inclusive).\n     * @param {integer} beforeIdx - Optional index to stop iterating before (exclusive).\n     * @param {Object} context - calling context (i.e. value of 'this' in callback)\n     */\n    forEach: function(callback, startIdx, beforeIdx, context) {\n      startIdx = startIdx | 0;\n      beforeIdx = beforeIdx || buffer.length;\n      for (let i = startIdx; i < beforeIdx; i++) {\n        callback.call(context, buffer[i], i);\n      }\n    },\n\n    /**\n     * Find element in buffer using buffer's comparison function.\n     * @memberof Tinode.CBuffer#\n     *\n     * @param {Object} elem - element to find.\n     * @param {boolean=} nearest - when true and exact match is not found, return the nearest element (insertion point).\n     * @returns {number} index of the element in the buffer or -1.\n     */\n    find: function(elem, nearest) {\n      const {\n        idx\n      } = findNearest(elem, buffer, !nearest);\n      return idx;\n    }\n  }\n}\n\n// Helper function for creating an endpoint URL\nfunction makeBaseUrl(host, protocol, apiKey) {\n  let url = null;\n\n  if (protocol === 'http' || protocol === 'https' || protocol === 'ws' || protocol === 'wss') {\n    url = protocol + '://';\n    url += host;\n    if (url.charAt(url.length - 1) !== '/') {\n      url += '/';\n    }\n    url += 'v' + PROTOCOL_VERSION + '/channels';\n    if (protocol === 'http' || protocol === 'https') {\n      // Long polling endpoint end with \"lp\", i.e.\n      // '/v0/channels/lp' vs just '/v0/channels' for ws\n      url += '/lp';\n    }\n    url += '?apikey=' + apiKey;\n  }\n\n  return url;\n}\n\n/**\n * An abstraction for a websocket or a long polling connection.\n *\n * @class Connection\n * @memberof Tinode\n *\n * @param {string} host_ - Host name and port number to connect to.\n * @param {string} apiKey_ - API key generated by keygen\n * @param {string} transport_ - Network transport to use, either `ws`/`wss` for websocket or `lp` for long polling.\n * @param {boolean} secure_ - Use secure WebSocket (wss) if true.\n * @param {boolean} autoreconnect_ - If connection is lost, try to reconnect automatically.\n */\nvar Connection = function(host_, apiKey_, transport_, secure_, autoreconnect_) {\n  let host = host_;\n  let secure = secure_;\n  let apiKey = apiKey_;\n\n  let autoreconnect = autoreconnect_;\n\n  // Settings for exponential backoff\n  const _BOFF_BASE = 2000; // 2000 milliseconds, minimum delay between reconnects\n  const _BOFF_MAX_ITER = 10; // Maximum delay between reconnects 2^10 * 2000 ~ 34 minutes\n  const _BOFF_JITTER = 0.3; // Add random delay\n\n  let _boffTimer = null;\n  let _boffIteration = 0;\n  let _boffClosed = false; // Indicator if the socket was manually closed - don't autoreconnect if true.\n\n  let log = (text, ...args) => {\n    if (this.logger) {\n      this.logger(text, ...args);\n    }\n  }\n\n  // Backoff implementation - reconnect after a timeout.\n  function boffReconnect() {\n    // Clear timer\n    clearTimeout(_boffTimer);\n    // Calculate when to fire the reconnect attempt\n    const timeout = _BOFF_BASE * (Math.pow(2, _boffIteration) * (1.0 + _BOFF_JITTER * Math.random()));\n    // Update iteration counter for future use\n    _boffIteration = (_boffIteration >= _BOFF_MAX_ITER ? _boffIteration : _boffIteration + 1);\n    if (this.onAutoreconnectIteration) {\n      this.onAutoreconnectIteration(timeout);\n    }\n\n    _boffTimer = setTimeout(() => {\n      log(\"Reconnecting, iter=\" + _boffIteration + \", timeout=\" + timeout);\n      // Maybe the socket was closed while we waited for the timer?\n      if (!_boffClosed) {\n        const prom = this.connect();\n        if (this.onAutoreconnectIteration) {\n          this.onAutoreconnectIteration(0, prom);\n        } else {\n          // Suppress error if it's not used.\n          prom.catch(() => {\n            /* do nothing */\n          });\n        }\n      } else if (this.onAutoreconnectIteration) {\n        this.onAutoreconnectIteration(-1);\n      }\n    }, timeout);\n  }\n\n  // Terminate auto-reconnect process.\n  function boffStop() {\n    clearTimeout(_boffTimer);\n    _boffTimer = null;\n  }\n\n  // Reset auto-reconnect iteration counter.\n  function boffReset() {\n    _boffIteration = 0;\n  }\n\n  // Initialization for Websocket\n  function init_ws(instance) {\n    let _socket = null;\n\n    /**\n     * Initiate a new connection\n     * @memberof Tinode.Connection#\n     * @param {string} host_ Host name to connect to; if null the old host name will be used.\n     * @param {boolean} force Force new connection even if one already exists.\n     * @return {Promise} Promise resolved/rejected when the connection call completes, resolution is called without parameters, rejection passes the {Error} as parameter.\n     */\n    instance.connect = function(host_, force) {\n      _boffClosed = false;\n\n      if (_socket) {\n        if (!force && _socket.readyState == _socket.OPEN) {\n          return Promise.resolve();\n        }\n        _socket.close();\n        _socket = null;\n      }\n\n      if (host_) {\n        host = host_;\n      }\n\n      return new Promise(function(resolve, reject) {\n        const url = makeBaseUrl(host, secure ? 'wss' : 'ws', apiKey);\n\n        log(\"Connecting to: \", url);\n\n        // It throws when the server is not accessible but the exception cannot be caught:\n        // https://stackoverflow.com/questions/31002592/javascript-doesnt-catch-error-in-websocket-instantiation/31003057\n        const conn = new WebSocketProvider(url);\n\n        conn.onerror = function(err) {\n          reject(err);\n        }\n\n        conn.onopen = function(evt) {\n          if (autoreconnect) {\n            boffStop();\n          }\n\n          if (instance.onOpen) {\n            instance.onOpen();\n          }\n\n          resolve();\n        }\n\n        conn.onclose = function(evt) {\n          _socket = null;\n\n          if (instance.onDisconnect) {\n            const code = _boffClosed ? NETWORK_USER : NETWORK_ERROR;\n            instance.onDisconnect(new Error(_boffClosed ? NETWORK_USER_TEXT : NETWORK_ERROR_TEXT +\n              ' (' + code + ')'), code);\n          }\n\n          if (!_boffClosed && autoreconnect) {\n            boffReconnect.call(instance);\n          }\n        }\n\n        conn.onmessage = function(evt) {\n          if (instance.onMessage) {\n            instance.onMessage(evt.data);\n          }\n        }\n        _socket = conn;\n      });\n    }\n\n    /**\n     * Try to restore a network connection, also reset backoff.\n     * @memberof Tinode.Connection#\n     *\n     * @param {boolean} force - reconnect even if there is a live connection already.\n     */\n    instance.reconnect = function(force) {\n      boffStop();\n      instance.connect(null, force);\n    }\n\n    /**\n     * Terminate the network connection\n     * @memberof Tinode.Connection#\n     */\n    instance.disconnect = function() {\n      _boffClosed = true;\n      boffStop();\n\n      if (!_socket) {\n        return;\n      }\n      _socket.close();\n      _socket = null;\n    }\n\n    /**\n     * Send a string to the server.\n     * @memberof Tinode.Connection#\n     *\n     * @param {string} msg - String to send.\n     * @throws Throws an exception if the underlying connection is not live.\n     */\n    instance.sendText = function(msg) {\n      if (_socket && (_socket.readyState == _socket.OPEN)) {\n        _socket.send(msg);\n      } else {\n        throw new Error(\"Websocket is not connected\");\n      }\n    };\n\n    /**\n     * Check if socket is alive.\n     * @memberof Tinode.Connection#\n     * @returns {boolean} true if connection is live, false otherwise\n     */\n    instance.isConnected = function() {\n      return (_socket && (_socket.readyState == _socket.OPEN));\n    }\n\n    /**\n     * Get the name of the current network transport.\n     * @memberof Tinode.Connection#\n     * @returns {string} name of the transport such as 'ws' or 'lp'.\n     */\n    instance.transport = function() {\n      return 'ws';\n    }\n\n    /**\n     * Send network probe to check if connection is indeed live.\n     * @memberof Tinode.Connection#\n     */\n    instance.probe = function() {\n      instance.sendText('1');\n    }\n  }\n\n  // Initialization for long polling.\n  function init_lp(instance) {\n    const XDR_UNSENT = 0; //\tClient has been created. open() not called yet.\n    const XDR_OPENED = 1; //\topen() has been called.\n    const XDR_HEADERS_RECEIVED = 2; // send() has been called, and headers and status are available.\n    const XDR_LOADING = 3; //\tDownloading; responseText holds partial data.\n    const XDR_DONE = 4; // The operation is complete.\n    // Fully composed endpoint URL, with API key & SID\n    let _lpURL = null;\n\n    let _poller = null;\n    let _sender = null;\n\n    function lp_sender(url_) {\n      let sender = new XMLHttpRequest();\n      sender.onreadystatechange = function(evt) {\n        if (sender.readyState == XDR_DONE && sender.status >= 400) {\n          // Some sort of error response\n          throw new Error(\"LP sender failed, \" + sender.status);\n        }\n      }\n\n      sender.open('POST', url_, true);\n      return sender;\n    }\n\n    function lp_poller(url_, resolve, reject) {\n      let poller = new XMLHttpRequest();\n      let promiseCompleted = false;\n\n      poller.onreadystatechange = function(evt) {\n\n        if (poller.readyState == XDR_DONE) {\n          if (poller.status == 201) { // 201 == HTTP.Created, get SID\n            let pkt = JSON.parse(poller.responseText, jsonParseHelper);\n            _lpURL = url_ + '&sid=' + pkt.ctrl.params.sid\n            poller = lp_poller(_lpURL);\n            poller.send(null)\n            if (instance.onOpen) {\n              instance.onOpen();\n            }\n\n            if (resolve) {\n              promiseCompleted = true;\n              resolve();\n            }\n\n            if (autoreconnect) {\n              boffStop();\n            }\n          } else if (poller.status < 400) { // 400 = HTTP.BadRequest\n            if (instance.onMessage) {\n              instance.onMessage(poller.responseText)\n            }\n            poller = lp_poller(_lpURL);\n            poller.send(null);\n          } else {\n            // Don't throw an error here, gracefully handle server errors\n            if (reject && !promiseCompleted) {\n              promiseCompleted = true;\n              reject(poller.responseText);\n            }\n            if (instance.onMessage && poller.responseText) {\n              instance.onMessage(poller.responseText);\n            }\n            if (instance.onDisconnect) {\n              const code = poller.status || (_boffClosed ? NETWORK_USER : NETWORK_ERROR);\n              const text = poller.responseText || (_boffClosed ? NETWORK_USER_TEXT : NETWORK_ERROR_TEXT);\n              instance.onDisconnect(new Error(text + ' (' + code + ')'), code);\n            }\n\n            // Polling has stopped. Indicate it by setting poller to null.\n            poller = null;\n            if (!_boffClosed && autoreconnect) {\n              boffReconnect.call(instance);\n            }\n          }\n        }\n      }\n      poller.open('GET', url_, true);\n      return poller;\n    }\n\n    instance.connect = function(host_, force) {\n      _boffClosed = false;\n\n      if (_poller) {\n        if (!force) {\n          return Promise.resolve();\n        }\n        _poller.onreadystatechange = undefined;\n        _poller.abort();\n        _poller = null;\n      }\n\n      if (host_) {\n        host = host_;\n      }\n\n      return new Promise(function(resolve, reject) {\n        const url = makeBaseUrl(host, secure ? 'https' : 'http', apiKey);\n        log(\"Connecting to: \", url);\n        _poller = lp_poller(url, resolve, reject);\n        _poller.send(null)\n      }).catch((err) => {\n        console.log(\"LP connection failed:\", err);\n      });\n    };\n\n    instance.reconnect = function(force) {\n      boffStop();\n      instance.connect(null, force);\n    };\n\n    instance.disconnect = function() {\n      _boffClosed = true;\n      boffStop();\n\n      if (_sender) {\n        _sender.onreadystatechange = undefined;\n        _sender.abort();\n        _sender = null;\n      }\n      if (_poller) {\n        _poller.onreadystatechange = undefined;\n        _poller.abort();\n        _poller = null;\n      }\n\n      if (instance.onDisconnect) {\n        instance.onDisconnect(new Error(NETWORK_USER_TEXT + ' (' + NETWORK_USER + ')'), NETWORK_USER);\n      }\n      // Ensure it's reconstructed\n      _lpURL = null;\n    }\n\n    instance.sendText = function(msg) {\n      _sender = lp_sender(_lpURL);\n      if (_sender && (_sender.readyState == 1)) { // 1 == OPENED\n        _sender.send(msg);\n      } else {\n        throw new Error(\"Long poller failed to connect\");\n      }\n    };\n\n    instance.isConnected = function() {\n      return (_poller && true);\n    }\n\n    instance.transport = function() {\n      return 'lp';\n    }\n\n    instance.probe = function() {\n      instance.sendText('1');\n    }\n  }\n\n  let initialized = false;\n  if (transport_ === 'lp') {\n    // explicit request to use long polling\n    init_lp(this);\n    initialized = true;\n  } else if (transport_ === 'ws') {\n    // explicit request to use web socket\n    // if websockets are not available, horrible things will happen\n    init_ws(this);\n    initialized = true;\n\n    // Default transport selection\n  } else if (typeof window == 'object') {\n    if (window['WebSocket']) {\n      // Using web sockets -- default.\n      init_ws(this);\n      initialized = true;\n    } else if (window['XMLHttpRequest']) {\n      // The browser has no websockets, using long polling.\n      init_lp(this);\n      initialized = true;\n    }\n  }\n\n  if (!initialized) {\n    // No transport is avaiilable.\n    console.log(\"No network transport is available. Running under Node? Call 'Tinode.setNetworkProviders()'.\");\n    throw new Error(\"No network transport is available. Running under Node? Call 'Tinode.setNetworkProviders()'.\");\n  }\n\n  /**\n   * Check if the given network transport is available.\n   * @memberof Tinode.Connection#\n   * @param {String} trans - either 'ws' (websocket) or 'lp' (long polling).\n   * @returns true if given transport is available, false otherwise.\n   */\n  this.transportAvailable = function(transp) {\n    switch (transp) {\n      case 'ws':\n        return typeof window == 'object' && window['WebSocket'];\n      case 'lp':\n        return typeof window == 'object' && window['XMLHttpRequest'];\n      default:\n        console.log(\"Request for unknown transport\", transp);\n        return false;\n    }\n  }\n\n  /**\n   * Reset autoreconnect counter to zero.\n   * @memberof Tinode.Connection#\n   */\n  this.backoffReset = function() {\n    boffReset();\n  }\n\n  // Callbacks:\n  /**\n   * A callback to pass incoming messages to. See {@link Tinode.Connection#onMessage}.\n   * @callback Tinode.Connection.OnMessage\n   * @memberof Tinode.Connection\n   * @param {string} message - Message to process.\n   */\n  /**\n   * A callback to pass incoming messages to.\n   * @type {Tinode.Connection.OnMessage}\n   * @memberof Tinode.Connection#\n   */\n  this.onMessage = undefined;\n\n  /**\n   * A callback for reporting a dropped connection.\n   * @type {function}\n   * @memberof Tinode.Connection#\n   */\n  this.onDisconnect = undefined;\n\n  /**\n   * A callback called when the connection is ready to be used for sending. For websockets it's socket open,\n   * for long polling it's readyState=1 (OPENED)\n   * @type {function}\n   * @memberof Tinode.Connection#\n   */\n  this.onOpen = undefined;\n\n  /**\n   * A callback to notify of reconnection attempts. See {@link Tinode.Connection#onAutoreconnectIteration}.\n   * @memberof Tinode.Connection\n   * @callback AutoreconnectIterationType\n   * @param {string} timeout - time till the next reconnect attempt in milliseconds. -1 means reconnect was skipped.\n   * @param {Promise} promise resolved or rejected when the reconnect attemp completes.\n   *\n   */\n  /**\n   * A callback to inform when the next attampt to reconnect will happen and to receive connection promise.\n   * @memberof Tinode.Connection#\n   * @type {Tinode.Connection.AutoreconnectIterationType}\n   */\n  this.onAutoreconnectIteration = undefined;\n\n  /**\n   * A callback to log events from Connection. See {@link Tinode.Connection#logger}.\n   * @memberof Tinode.Connection\n   * @callback LoggerCallbackType\n   * @param {string} event - Event to log.\n   */\n  /**\n   * A callback to report logging events.\n   * @memberof Tinode.Connection#\n   * @type {Tinode.Connection.LoggerCallbackType}\n   */\n  this.logger = undefined;\n};\n\n/**\n * @class Tinode\n *\n * @param {string} appname_ - Name of the caliing application to be reported in User Agent.\n * @param {string} host_ - Host name and port number to connect to.\n * @param {string} apiKey_ - API key generated by keygen\n * @param {string} transport_ - See {@link Tinode.Connection#transport}.\n * @param {boolean} secure_ - Use Secure WebSocket if true.\n * @param {string} platform_ - Optional platform identifier, one of \"ios\", \"web\", \"android\".\n */\nvar Tinode = function(appname_, host_, apiKey_, transport_, secure_, platform_) {\n  // Client-provided application name, format <Name>/<version number>\n  if (appname_) {\n    this._appName = appname_;\n  } else {\n    this._appName = \"Undefined\";\n  }\n\n  // API Key.\n  this._apiKey = apiKey_;\n\n  // Name and version of the browser.\n  this._browser = '';\n  this._platform = platform_;\n  this._hwos = 'undefined';\n  this._humanLanguage = 'xx';\n  // Underlying OS.\n  if (typeof navigator != 'undefined') {\n    this._browser = getBrowserInfo(navigator.userAgent, navigator.product);\n    this._hwos = navigator.platform;\n    // This is the default language. It could be changed by client.\n    this._humanLanguage = navigator.language || 'en-US';\n  }\n  // Logging to console enabled\n  this._loggingEnabled = false;\n  // When logging, trip long strings (base64-encoded images) for readability\n  this._trimLongStrings = false;\n  // UID of the currently authenticated user.\n  this._myUID = null;\n  // Status of connection: authenticated or not.\n  this._authenticated = false;\n  // Login used in the last successful basic authentication\n  this._login = null;\n  // Token which can be used for login instead of login/password.\n  this._authToken = null;\n  // Counter of received packets\n  this._inPacketCount = 0;\n  // Counter for generating unique message IDs\n  this._messageId = Math.floor((Math.random() * 0xFFFF) + 0xFFFF);\n  // Information about the server, if connected\n  this._serverInfo = null;\n  // Push notification token. Called deviceToken for consistency with the Android SDK.\n  this._deviceToken = null;\n\n  // Cache of pending promises by message id.\n  this._pendingPromises = {};\n\n  // The Timeout object returned by the reject expired promises setInterval\n  this._expirePromises = null;\n\n\n  /** A connection object, see {@link Tinode.Connection}. */\n  this._connection = new Connection(host_, apiKey_, transport_, secure_, true);\n  // Console logger. Babel somehow fails to parse '...rest' parameter.\n  this.logger = (str, ...args) => {\n    if (this._loggingEnabled) {\n      const d = new Date()\n      const dateString = ('0' + d.getUTCHours()).slice(-2) + ':' +\n        ('0' + d.getUTCMinutes()).slice(-2) + ':' +\n        ('0' + d.getUTCSeconds()).slice(-2) + '.' +\n        ('00' + d.getUTCMilliseconds()).slice(-3);\n\n      console.log('[' + dateString + ']', str, args.join(' '));\n    }\n  }\n  this._connection.logger = this.logger;\n\n  // Tinode's cache of objects\n  this._cache = {};\n\n  const cachePut = this.cachePut = (type, name, obj) => {\n    this._cache[type + ':' + name] = obj;\n  }\n\n  const cacheGet = this.cacheGet = (type, name) => {\n    return this._cache[type + ':' + name];\n  }\n\n  const cacheDel = this.cacheDel = (type, name) => {\n    delete this._cache[type + ':' + name];\n  }\n  // Enumerate all items in cache, call func for each item.\n  // Enumeration stops if func returns true.\n  const cacheMap = this.cacheMap = (func, context) => {\n    for (let idx in this._cache) {\n      if (func(this._cache[idx], idx, context)) {\n        break;\n      }\n    }\n  }\n\n  // Make limited cache management available to topic.\n  // Caching user.public only. Everything else is per-topic.\n  this.attachCacheToTopic = (topic) => {\n    topic._tinode = this;\n\n    topic._cacheGetUser = (uid) => {\n      const pub = cacheGet('user', uid);\n      if (pub) {\n        return {\n          user: uid,\n          public: mergeObj({}, pub)\n        };\n      }\n      return undefined;\n    };\n    topic._cachePutUser = (uid, user) => {\n      return cachePut('user', uid, mergeObj({}, user.public));\n    };\n    topic._cacheDelUser = (uid) => {\n      return cacheDel('user', uid);\n    };\n    topic._cachePutSelf = () => {\n      return cachePut('topic', topic.name, topic);\n    }\n    topic._cacheDelSelf = () => {\n      return cacheDel('topic', topic.name);\n    }\n  }\n\n  // Resolve or reject a pending promise.\n  // Unresolved promises are stored in _pendingPromises.\n  const execPromise = (id, code, onOK, errorText) => {\n    const callbacks = this._pendingPromises[id];\n    if (callbacks) {\n      delete this._pendingPromises[id];\n      if (code >= 200 && code < 400) {\n        if (callbacks.resolve) {\n          callbacks.resolve(onOK);\n        }\n      } else if (callbacks.reject) {\n        callbacks.reject(new Error(errorText + \" (\" + code + \")\"));\n      }\n    }\n  }\n\n  // Generator of default promises for sent packets.\n  const makePromise = (id) => {\n    let promise = null;\n    if (id) {\n      promise = new Promise((resolve, reject) => {\n        // Stored callbacks will be called when the response packet with this Id arrives\n        this._pendingPromises[id] = {\n          'resolve': resolve,\n          'reject': reject,\n          'ts': new Date()\n        };\n      })\n    }\n    return promise;\n  }\n\n  // Generates unique message IDs\n  const getNextUniqueId = this.getNextUniqueId = () => {\n    return (this._messageId != 0) ? '' + this._messageId++ : undefined;\n  }\n\n  // Get User Agent string\n  const getUserAgent = () => {\n    return this._appName + ' (' + (this._browser ? this._browser + '; ' : '') + this._hwos + '); ' + LIBRARY;\n  }\n\n  // Generator of packets stubs\n  this.initPacket = (type, topic) => {\n    switch (type) {\n      case 'hi':\n        return {\n          'hi': {\n            'id': getNextUniqueId(),\n            'ver': VERSION,\n            'ua': getUserAgent(),\n            'dev': this._deviceToken,\n            'lang': this._humanLanguage,\n            'platf': this._platform\n          }\n        };\n\n      case 'acc':\n        return {\n          'acc': {\n            'id': getNextUniqueId(),\n            'user': null,\n            'scheme': null,\n            'secret': null,\n            'login': false,\n            'tags': null,\n            'desc': {},\n            'cred': {}\n          }\n        };\n\n      case 'login':\n        return {\n          'login': {\n            'id': getNextUniqueId(),\n            'scheme': null,\n            'secret': null\n          }\n        };\n\n      case 'sub':\n        return {\n          'sub': {\n            'id': getNextUniqueId(),\n            'topic': topic,\n            'set': {},\n            'get': {}\n          }\n        };\n\n      case 'leave':\n        return {\n          'leave': {\n            'id': getNextUniqueId(),\n            'topic': topic,\n            'unsub': false\n          }\n        };\n\n      case 'pub':\n        return {\n          'pub': {\n            'id': getNextUniqueId(),\n            'topic': topic,\n            'noecho': false,\n            'head': null,\n            'content': {}\n          }\n        };\n\n      case 'get':\n        return {\n          'get': {\n            'id': getNextUniqueId(),\n            'topic': topic,\n            'what': null, // data, sub, desc, space separated list; unknown strings are ignored\n            'desc': {},\n            'sub': {},\n            'data': {}\n          }\n        };\n\n      case 'set':\n        return {\n          'set': {\n            'id': getNextUniqueId(),\n            'topic': topic,\n            'desc': {},\n            'sub': {},\n            'tags': []\n          }\n        };\n\n      case 'del':\n        return {\n          'del': {\n            'id': getNextUniqueId(),\n            'topic': topic,\n            'what': null,\n            'delseq': null,\n            'user': null,\n            'hard': false\n          }\n        };\n\n      case 'note':\n        return {\n          'note': {\n            // no id by design\n            'topic': topic,\n            'what': null, // one of \"recv\", \"read\", \"kp\"\n            'seq': undefined // the server-side message id aknowledged as received or read\n          }\n        };\n\n      default:\n        throw new Error(\"Unknown packet type requested: \" + type);\n    }\n  }\n\n  // Send a packet. If packet id is provided return a promise.\n  this.send = (pkt, id) => {\n    let promise;\n    if (id) {\n      promise = makePromise(id);\n    }\n    pkt = simplify(pkt);\n    let msg = JSON.stringify(pkt);\n    this.logger(\"out: \" + (this._trimLongStrings ? JSON.stringify(pkt, jsonLoggerHelper) : msg));\n    try {\n      this._connection.sendText(msg);\n    } catch (err) {\n      // If sendText throws, wrap the error in a promise or rethrow.\n      if (id) {\n        execPromise(id, NETWORK_ERROR, null, err.message);\n      } else {\n        throw err;\n      }\n    }\n    return promise;\n  }\n\n  // On successful login save server-provided data.\n  this.loginSuccessful = (ctrl) => {\n    if (!ctrl.params || !ctrl.params.user) {\n      return;\n    }\n    // This is a response to a successful login,\n    // extract UID and security token, save it in Tinode module\n    this._myUID = ctrl.params.user;\n    this._authenticated = (ctrl && ctrl.code >= 200 && ctrl.code < 300);\n    if (ctrl.params && ctrl.params.token && ctrl.params.expires) {\n      this._authToken = {\n        token: ctrl.params.token,\n        expires: new Date(ctrl.params.expires)\n      };\n    } else {\n      this._authToken = null;\n    }\n\n    if (this.onLogin) {\n      this.onLogin(ctrl.code, ctrl.text);\n    }\n  }\n\n  // The main message dispatcher.\n  this._connection.onMessage = (data) => {\n    // Skip empty response. This happens when LP times out.\n    if (!data) return;\n\n    this._inPacketCount++;\n\n    // Send raw message to listener\n    if (this.onRawMessage) {\n      this.onRawMessage(data);\n    }\n\n    if (data === '0') {\n      // Server response to a network probe.\n      if (this.onNetworkProbe) {\n        this.onNetworkProbe();\n      }\n      // No processing is necessary.\n      return;\n    }\n\n    let pkt = JSON.parse(data, jsonParseHelper);\n    if (!pkt) {\n      this.logger(\"in: \" + data);\n      this.logger(\"ERROR: failed to parse data\");\n    } else {\n      this.logger(\"in: \" + (this._trimLongStrings ? JSON.stringify(pkt, jsonLoggerHelper) : data));\n\n      // Send complete packet to listener\n      if (this.onMessage) {\n        this.onMessage(pkt);\n      }\n\n      if (pkt.ctrl) {\n        // Handling {ctrl} message\n        if (this.onCtrlMessage) {\n          this.onCtrlMessage(pkt.ctrl);\n        }\n\n        // Resolve or reject a pending promise, if any\n        if (pkt.ctrl.id) {\n          execPromise(pkt.ctrl.id, pkt.ctrl.code, pkt.ctrl, pkt.ctrl.text);\n        }\n        setTimeout(() => {\n          if (pkt.ctrl.code == 205 && pkt.ctrl.text == 'evicted') {\n            // User evicted from topic.\n            const topic = cacheGet('topic', pkt.ctrl.topic);\n            if (topic) {\n              topic._resetSub();\n              if (pkt.ctrl.params && pkt.ctrl.params.unsub) {\n                topic._gone();\n              }\n            }\n          } else if (pkt.ctrl.params && pkt.ctrl.params.what == 'data') {\n            // All messages received: \"params\":{\"count\":11,\"what\":\"data\"},\n            const topic = cacheGet('topic', pkt.ctrl.topic);\n            if (topic) {\n              topic._allMessagesReceived(pkt.ctrl.params.count);\n            }\n          } else if (pkt.ctrl.params && pkt.ctrl.params.what == 'sub') {\n            // The topic has no subscriptions.\n            const topic = cacheGet('topic', pkt.ctrl.topic);\n            if (topic) {\n              // Trigger topic.onSubsUpdated.\n              topic._processMetaSub([]);\n            }\n          }\n        }, 0);\n      } else {\n        setTimeout(() => {\n          if (pkt.meta) {\n            // Handling a {meta} message.\n\n            // Preferred API: Route meta to topic, if one is registered\n            const topic = cacheGet('topic', pkt.meta.topic);\n            if (topic) {\n              topic._routeMeta(pkt.meta);\n            }\n\n            if (pkt.meta.id) {\n              execPromise(pkt.meta.id, 200, pkt.meta, 'META');\n            }\n\n            // Secondary API: callback\n            if (this.onMetaMessage) {\n              this.onMetaMessage(pkt.meta);\n            }\n          } else if (pkt.data) {\n            // Handling {data} message\n\n            // Preferred API: Route data to topic, if one is registered\n            const topic = cacheGet('topic', pkt.data.topic);\n            if (topic) {\n              topic._routeData(pkt.data);\n            }\n\n            // Secondary API: Call callback\n            if (this.onDataMessage) {\n              this.onDataMessage(pkt.data);\n            }\n          } else if (pkt.pres) {\n            // Handling {pres} message\n\n            // Preferred API: Route presence to topic, if one is registered\n            const topic = cacheGet('topic', pkt.pres.topic);\n            if (topic) {\n              topic._routePres(pkt.pres);\n            }\n\n            // Secondary API - callback\n            if (this.onPresMessage) {\n              this.onPresMessage(pkt.pres);\n            }\n          } else if (pkt.info) {\n            // {info} message - read/received notifications and key presses\n\n            // Preferred API: Route {info}} to topic, if one is registered\n            const topic = cacheGet('topic', pkt.info.topic);\n            if (topic) {\n              topic._routeInfo(pkt.info);\n            }\n\n            // Secondary API - callback\n            if (this.onInfoMessage) {\n              this.onInfoMessage(pkt.info);\n            }\n          } else {\n            this.logger(\"ERROR: Unknown packet received.\");\n          }\n        }, 0);\n      }\n    }\n  }\n\n  // Ready to start sending.\n  this._connection.onOpen = () => {\n    if (!this._expirePromises) {\n      // Reject promises which have not been resolved for too long.\n      this._expirePromises = setInterval(() => {\n        const err = new Error(\"Timeout (504)\");\n        const expires = new Date(new Date().getTime() - EXPIRE_PROMISES_TIMEOUT);\n        for (let id in this._pendingPromises) {\n          let callbacks = this._pendingPromises[id];\n          if (callbacks && callbacks.ts < expires) {\n            this.logger(\"Promise expired\", id);\n            delete this._pendingPromises[id];\n            if (callbacks.reject) {\n              callbacks.reject(err);\n            }\n          }\n        }\n      }, EXPIRE_PROMISES_PERIOD);\n    }\n    this.hello();\n  }\n\n  // Wrapper for the reconnect iterator callback.\n  this._connection.onAutoreconnectIteration = (timeout, promise) => {\n    if (this.onAutoreconnectIteration) {\n      this.onAutoreconnectIteration(timeout, promise);\n    }\n  }\n\n  this._connection.onDisconnect = (err, code) => {\n    this._inPacketCount = 0;\n    this._serverInfo = null;\n    this._authenticated = false;\n\n    if (this._expirePromises) {\n      clearInterval(this._expirePromises);\n      this._expirePromises = null;\n    }\n\n    // Mark all topics as unsubscribed\n    cacheMap((obj, key) => {\n      if (key.lastIndexOf('topic:', 0) === 0) {\n        obj._resetSub();\n      }\n    });\n\n    // Reject all pending promises\n    for (let key in this._pendingPromises) {\n      let callbacks = this._pendingPromises[key];\n      if (callbacks && callbacks.reject) {\n        callbacks.reject(err);\n      }\n    }\n    this._pendingPromises = {};\n\n    if (this.onDisconnect) {\n      this.onDisconnect(err);\n    }\n  }\n};\n\n// Static methods.\n\n/**\n * Helper method to package account credential.\n * @memberof Tinode\n * @static\n *\n * @param {String|Object} meth - validation method or object with validation data.\n * @param {String=} val - validation value (e.g. email or phone number).\n * @param {Object=} params - validation parameters.\n * @param {String=} resp - validation response.\n *\n * @returns {Array} array with a single credentail or null if no valid credentials were given.\n */\nTinode.credential = function(meth, val, params, resp) {\n  if (typeof meth == 'object') {\n    ({\n      val,\n      params,\n      resp,\n      meth\n    } = meth);\n  }\n  if (meth && (val || resp)) {\n    return [{\n      'meth': meth,\n      'val': val,\n      'resp': resp,\n      'params': params\n    }];\n  }\n  return null;\n};\n\n/**\n * Determine topic type from topic's name: grp, p2p, me, fnd.\n * @memberof Tinode\n * @static\n *\n * @param {string} name - Name of the topic to test.\n * @returns {string} One of <tt>'me'</tt>, <tt>'grp'</tt>, <tt>'p2p'</tt> or <tt>undefined</tt>.\n */\nTinode.topicType = function(name) {\n  const types = {\n    'me': 'me',\n    'fnd': 'fnd',\n    'grp': 'grp',\n    'new': 'grp',\n    'nch': 'grp',\n    'chn': 'grp',\n    'usr': 'p2p',\n    'sys': 'sys'\n  };\n  return types[(typeof name == 'string') ? name.substring(0, 3) : 'xxx'];\n};\n\n/**\n * Check if the given topic name is a name of a group topic.\n * @memberof Tinode\n * @static\n *\n * @param {string} name - Name of the topic to test.\n * @returns {boolean} true if the name is a name of a group topic, false otherwise.\n */\nTinode.isGroupTopicName = function(name) {\n  return Tinode.topicType(name) === 'grp';\n};\n\n/**\n * Check if the given topic name is a name of a p2p topic.\n * @memberof Tinode\n * @static\n *\n * @param {string} name - Name of the topic to test.\n * @returns {boolean} true if the name is a name of a p2p topic, false otherwise.\n */\nTinode.isP2PTopicName = function(name) {\n  return Tinode.topicType(name) === 'p2p';\n};\n\n/**\n * Check if the topic name is a name of a new topic.\n * @memberof Tinode\n * @static\n *\n * @param {string} name - topic name to check.\n * @returns {boolean} true if the name is a name of a new topic.\n */\nTinode.isNewGroupTopicName = function(name) {\n  return (typeof name == 'string') &&\n    (name.substring(0, 3) == TOPIC_NEW || name.substring(0, 3) == TOPIC_NEW_CHAN);\n};\n\n/**\n * Check if the topic name is a name of a channel.\n * @memberof Tinode\n * @static\n *\n * @param {string} name - topic name to check.\n * @returns {boolean} true if the name is a name of a channel.\n */\nTinode.isChannelTopicName = function(name) {\n  return (typeof name == 'string') &&\n    (name.substring(0, 3) == TOPIC_CHAN || name.substring(0, 3) == TOPIC_NEW_CHAN);\n};\n\n/**\n * Return information about the current version of this Tinode client library.\n * @memberof Tinode\n * @static\n *\n * @returns {string} semantic version of the library, e.g. '0.15.5-rc1'.\n */\nTinode.getVersion = function() {\n  return VERSION;\n};\n\n/**\n * To use Tinode in a non browser context, supply WebSocket and XMLHttpRequest providers.\n * @static\n * @memberof Tinode\n * @param wsProvider WebSocket provider, e.g. for nodeJS require('ws').\n * @param xhrProvider XMLHttpRequest provider, e.g. for node require('xhr').\n */\nTinode.setNetworkProviders = function(wsProvider, xhrProvider) {\n  WebSocketProvider = wsProvider;\n  XHRProvider = xhrProvider;\n};\n\n/**\n * Return information about the current name and version of this Tinode library.\n * @memberof Tinode\n * @static\n *\n * @returns {string} the name of the library and it's version.\n */\nTinode.getLibrary = function() {\n  return LIBRARY;\n};\n\n// Exported constants\nTinode.MESSAGE_STATUS_NONE = MESSAGE_STATUS_NONE;\nTinode.MESSAGE_STATUS_QUEUED = MESSAGE_STATUS_QUEUED;\nTinode.MESSAGE_STATUS_SENDING = MESSAGE_STATUS_SENDING;\nTinode.MESSAGE_STATUS_FAILED = MESSAGE_STATUS_FAILED;\nTinode.MESSAGE_STATUS_SENT = MESSAGE_STATUS_SENT;\nTinode.MESSAGE_STATUS_RECEIVED = MESSAGE_STATUS_RECEIVED;\nTinode.MESSAGE_STATUS_READ = MESSAGE_STATUS_READ;\nTinode.MESSAGE_STATUS_TO_ME = MESSAGE_STATUS_TO_ME;\n\n// Unicode [del] symbol.\nTinode.DEL_CHAR = '\\u2421';\n\n/**\n * Check if the given string represents NULL value as defined by Tinode ('\\u2421').\n * @memberof Tinode\n * @static\n *\n * @param {String} str - string to check for null value.\n *\n * @returns {boolean} true if string represents NULL value, false otherwise.\n */\nTinode.isNullValue = function(str) {\n  return str === Tinode.DEL_CHAR;\n};\n\n/**\n * Check if the given URL string is a relative URL.\n * Check for cases like:\n *  'http://example.com'\n *  ' http://example.com'\n *  '//example.com/'\n *  'http:example.com'\n *  'http:/example.com'\n * @memberof Tinode\n * @static\n *\n * @param {String} url - URL string to check.\n *\n * @returns {boolean} true if the URL is relative, false otherwise.\n */\nTinode.isRelativeURL = function(url) {\n  return !/^\\s*([a-z][a-z0-9+.-]*:|\\/\\/)/im.test(url);\n};\n\n// Names of keys to server-provided configuration limits.\nTinode.MAX_MESSAGE_SIZE = 'maxMessageSize';\nTinode.MAX_SUBSCRIBER_COUNT = 'maxSubscriberCount';\nTinode.MAX_TAG_COUNT = 'maxTagCount';\nTinode.MAX_FILE_UPLOAD_SIZE = 'maxFileUploadSize';\n\n// Public methods;\nTinode.prototype = {\n  /**\n   * Connect to the server.\n   * @memberof Tinode#\n   *\n   * @param {String} host_ - name of the host to connect to.\n   *\n   * @return {Promise} Promise resolved/rejected when the connection call completes:\n   * <tt>resolve()</tt> is called without parameters, <tt>reject()</tt> receives the <tt>Error</tt> as a single parameter.\n   */\n  connect: function(host_) {\n    return this._connection.connect(host_);\n  },\n\n  /**\n   * Attempt to reconnect to the server immediately.\n   * @memberof Tinode#\n   *\n   * @param {String} force - reconnect even if there is a connection already.\n   */\n  reconnect: function(force) {\n    this._connection.reconnect(force);\n  },\n\n  /**\n   * Disconnect from the server.\n   * @memberof Tinode#\n   */\n  disconnect: function() {\n    this._connection.disconnect();\n  },\n\n  /**\n   * Send a network probe message to make sure the connection is alive.\n   * @memberof Tinode#\n   */\n  networkProbe: function() {\n    this._connection.probe();\n  },\n\n  /**\n   * Check for live connection to server.\n   * @memberof Tinode#\n   *\n   * @returns {Boolean} true if there is a live connection, false otherwise.\n   */\n  isConnected: function() {\n    return this._connection.isConnected();\n  },\n\n  /**\n   * Check if connection is authenticated (last login was successful).\n   * @memberof Tinode#\n   * @returns {boolean} true if authenticated, false otherwise.\n   */\n  isAuthenticated: function() {\n    return this._authenticated;\n  },\n\n  /**\n   * Add API key and auth token to the relative URL making it usable for getting data\n   * from the server in a simple GET request.\n   * @memberof Tinode#\n   *\n   * @param {String} URL to wrap.\n   * @returns {string} URL with appended API key and token, if valid token is present.\n   */\n  authorizeURL: function(url) {\n    if (!url) {\n      return url;\n    }\n\n    if (Tinode.isRelativeURL(url)) {\n      // Fake base to make the relative URL parseable.\n      const base = 'scheme://host/';\n      const parsed = new URL(url, base);\n      if (this._apiKey) {\n        parsed.searchParams.append('apikey', this._apiKey);\n      }\n      if (this._authToken.token) {\n        parsed.searchParams.append('auth', 'token');\n        parsed.searchParams.append('secret', this._authToken.token);\n      }\n      // Convert back to string and strip fake base URL except for the root slash.\n      url = parsed.toString().substring(base.length - 1);\n    }\n    return url;\n  },\n\n  /**\n   * @typedef AccountParams\n   * @memberof Tinode\n   * @type Object\n   * @property {Tinode.DefAcs=} defacs - Default access parameters for user's <tt>me</tt> topic.\n   * @property {Object=} public - Public application-defined data exposed on <tt>me</tt> topic.\n   * @property {Object=} private - Private application-defined data accessible on <tt>me</tt> topic.\n   * @property {Array} tags - array of string tags for user discovery.\n   * @property {string=} token - authentication token to use.\n   */\n  /**\n   * @typedef DefAcs\n   * @memberof Tinode\n   * @type Object\n   * @property {string=} auth - Access mode for <tt>me</tt> for authenticated users.\n   * @property {string=} anon - Access mode for <tt>me</tt>  anonymous users.\n   */\n\n  /**\n   * Create or update an account.\n   * @memberof Tinode#\n   *\n   * @param {String} uid - User id to update\n   * @param {String} scheme - Authentication scheme; <tt>\"basic\"</tt> and <tt>\"anonymous\"</tt> are the currently supported schemes.\n   * @param {String} secret - Authentication secret, assumed to be already base64 encoded.\n   * @param {Boolean=} login - Use new account to authenticate current session\n   * @param {Tinode.AccountParams=} params - User data to pass to the server.\n   */\n  account: function(uid, scheme, secret, login, params) {\n    const pkt = this.initPacket('acc');\n    pkt.acc.user = uid;\n    pkt.acc.scheme = scheme;\n    pkt.acc.secret = secret;\n    // Log in to the new account using selected scheme\n    pkt.acc.login = login;\n\n    if (params) {\n      pkt.acc.desc.defacs = params.defacs;\n      pkt.acc.desc.public = params.public;\n      pkt.acc.desc.private = params.private;\n\n      pkt.acc.tags = params.tags;\n      pkt.acc.cred = params.cred;\n\n      pkt.acc.token = params.token;\n    }\n\n    return this.send(pkt, pkt.acc.id);\n  },\n\n  /**\n   * Create a new user. Wrapper for {@link Tinode#account}.\n   * @memberof Tinode#\n   *\n   * @param {String} scheme - Authentication scheme; <tt>\"basic\"</tt> is the only currently supported scheme.\n   * @param {String} secret - Authentication.\n   * @param {Boolean=} login - Use new account to authenticate current session\n   * @param {Tinode.AccountParams=} params - User data to pass to the server.\n   *\n   * @returns {Promise} Promise which will be resolved/rejected when server reply is received.\n   */\n  createAccount: function(scheme, secret, login, params) {\n    let promise = this.account(USER_NEW, scheme, secret, login, params);\n    if (login) {\n      promise = promise.then((ctrl) => {\n        this.loginSuccessful(ctrl);\n        return ctrl;\n      });\n    }\n    return promise;\n  },\n\n  /**\n   * Create user with 'basic' authentication scheme and immediately\n   * use it for authentication. Wrapper for {@link Tinode#account}.\n   * @memberof Tinode#\n   *\n   * @param {string} username - Login to use for the new account.\n   * @param {string} password - User's password.\n   * @param {Tinode.AccountParams=} params - User data to pass to the server.\n   *\n   * @returns {Promise} Promise which will be resolved/rejected when server reply is received.\n   */\n  createAccountBasic: function(username, password, params) {\n    // Make sure we are not using 'null' or 'undefined';\n    username = username || '';\n    password = password || '';\n    return this.createAccount('basic',\n      b64EncodeUnicode(username + ':' + password), true, params);\n  },\n\n  /**\n   * Update user's credentials for 'basic' authentication scheme. Wrapper for {@link Tinode#account}.\n   * @memberof Tinode#\n   *\n   * @param {string} uid - User ID to update.\n   * @param {string} username - Login to use for the new account.\n   * @param {string} password - User's password.\n   * @param {Tinode.AccountParams=} params - data to pass to the server.\n   *\n   * @returns {Promise} Promise which will be resolved/rejected when server reply is received.\n   */\n  updateAccountBasic: function(uid, username, password, params) {\n    // Make sure we are not using 'null' or 'undefined';\n    username = username || '';\n    password = password || '';\n    return this.account(uid, 'basic',\n      b64EncodeUnicode(username + ':' + password), false, params);\n  },\n\n  /**\n   * Send handshake to the server.\n   * @memberof Tinode#\n   *\n   * @returns {Promise} Promise which will be resolved/rejected when server reply is received.\n   */\n  hello: function() {\n    const pkt = this.initPacket('hi');\n\n    return this.send(pkt, pkt.hi.id)\n      .then((ctrl) => {\n        // Reset backoff counter on successful connection.\n        this._connection.backoffReset();\n\n        // Server response contains server protocol version, build, constraints,\n        // session ID for long polling. Save them.\n        if (ctrl.params) {\n          this._serverInfo = ctrl.params;\n        }\n\n        if (this.onConnect) {\n          this.onConnect();\n        }\n\n        return ctrl;\n      }).catch((err) => {\n        this._connection.reconnect(true);\n\n        if (this.onDisconnect) {\n          this.onDisconnect(err);\n        }\n      });\n  },\n\n  /**\n   * Set or refresh the push notifications/device token. If the client is connected,\n   * the deviceToken can be sent to the server.\n   *\n   * @memberof Tinode#\n   * @param {string} dt - token obtained from the provider.\n   * @param {boolean} sendToServer - if true, send dt to server immediately.\n   *\n   * @returns true if attempt was made to send the token to the server.\n   */\n  setDeviceToken: function(dt, sendToServer) {\n    let sent = false;\n    if (dt && dt != this._deviceToken) {\n      this._deviceToken = dt;\n      if (sendToServer && this.isConnected() && this.isAuthenticated()) {\n        this.send({\n          'hi': {\n            'dev': dt\n          }\n        });\n        sent = true;\n      }\n    }\n    return sent;\n  },\n\n  /**\n   * Authenticate current session.\n   * @memberof Tinode#\n   *\n   * @param {String} scheme - Authentication scheme; <tt>\"basic\"</tt> is the only currently supported scheme.\n   * @param {String} secret - Authentication secret, assumed to be already base64 encoded.\n   *\n   * @returns {Promise} Promise which will be resolved/rejected when server reply is received.\n   */\n  login: function(scheme, secret, cred) {\n    const pkt = this.initPacket('login');\n    pkt.login.scheme = scheme;\n    pkt.login.secret = secret;\n    pkt.login.cred = cred;\n\n    return this.send(pkt, pkt.login.id)\n      .then((ctrl) => {\n        this.loginSuccessful(ctrl);\n        return ctrl;\n      });\n  },\n\n  /**\n   * Wrapper for {@link Tinode#login} with basic authentication\n   * @memberof Tinode#\n   *\n   * @param {String} uname - User name.\n   * @param {String} password  - Password.\n   * @returns {Promise} Promise which will be resolved/rejected on receiving server reply.\n   */\n  loginBasic: function(uname, password, cred) {\n    return this.login('basic', b64EncodeUnicode(uname + ':' + password), cred)\n      .then((ctrl) => {\n        this._login = uname;\n        return ctrl;\n      });\n  },\n\n  /**\n   * Wrapper for {@link Tinode#login} with token authentication\n   * @memberof Tinode#\n   *\n   * @param {String} token - Token received in response to earlier login.\n   * @returns {Promise} Promise which will be resolved/rejected on receiving server reply.\n   */\n  loginToken: function(token, cred) {\n    return this.login('token', token, cred);\n  },\n\n  /**\n   * Send a request for resetting an authentication secret.\n   * @memberof Tinode#\n   *\n   * @param {String} scheme - authentication scheme to reset.\n   * @param {String} method - method to use for resetting the secret, such as \"email\" or \"tel\".\n   * @param {String} value - value of the credential to use, a specific email address or a phone number.\n   *\n   * @returns {Promise} Promise which will be resolved/rejected on receiving the server reply.\n   */\n  requestResetAuthSecret: function(scheme, method, value) {\n    return this.login('reset', b64EncodeUnicode(scheme + ':' + method + ':' + value));\n  },\n\n  /**\n   * @typedef AuthToken\n   * @memberof Tinode\n   * @type Object\n   * @property {String} token - Token value.\n   * @property {Date} expires - Token expiration time.\n   */\n  /**\n   * Get stored authentication token.\n   * @memberof Tinode#\n   *\n   * @returns {Tinode.AuthToken} authentication token.\n   */\n  getAuthToken: function() {\n    if (this._authToken && (this._authToken.expires.getTime() > Date.now())) {\n      return this._authToken;\n    } else {\n      this._authToken = null;\n    }\n    return null;\n  },\n\n  /**\n   * Application may provide a saved authentication token.\n   * @memberof Tinode#\n   *\n   * @param {Tinode.AuthToken} token - authentication token.\n   */\n  setAuthToken: function(token) {\n    this._authToken = token;\n  },\n\n  /**\n   * @typedef SetParams\n   * @memberof Tinode\n   * @property {Tinode.SetDesc=} desc - Topic initialization parameters when creating a new topic or a new subscription.\n   * @property {Tinode.SetSub=} sub - Subscription initialization parameters.\n   */\n  /**\n   * @typedef SetDesc\n   * @memberof Tinode\n   * @property {Tinode.DefAcs=} defacs - Default access mode.\n   * @property {Object=} public - Free-form topic description, publically accessible.\n   * @property {Object=} private - Free-form topic descriptionaccessible only to the owner.\n   */\n  /**\n   * @typedef SetSub\n   * @memberof Tinode\n   * @property {String=} user - UID of the user affected by the request. Default (empty) - current user.\n   * @property {String=} mode - User access mode, either requested or assigned dependent on context.\n   * @property {Object=} info - Free-form payload to pass to the invited user or topic manager.\n   */\n  /**\n   * Parameters passed to {@link Tinode#subscribe}.\n   *\n   * @typedef SubscriptionParams\n   * @memberof Tinode\n   * @property {Tinode.SetParams=} set - Parameters used to initialize topic\n   * @property {Tinode.GetQuery=} get - Query for fetching data from topic.\n   */\n\n  /**\n   * Send a topic subscription request.\n   * @memberof Tinode#\n   *\n   * @param {String} topic - Name of the topic to subscribe to.\n   * @param {Tinode.GetQuery=} getParams - Optional subscription metadata query\n   * @param {Tinode.SetParams=} setParams - Optional initialization parameters\n   *\n   * @returns {Promise} Promise which will be resolved/rejected on receiving server reply.\n   */\n  subscribe: function(topicName, getParams, setParams) {\n    const pkt = this.initPacket('sub', topicName)\n    if (!topicName) {\n      topicName = TOPIC_NEW;\n    }\n\n    pkt.sub.get = getParams;\n\n    if (setParams) {\n      if (setParams.sub) {\n        pkt.sub.set.sub = setParams.sub;\n      }\n\n      if (setParams.desc) {\n        if (Tinode.isNewGroupTopicName(topicName)) {\n          // Full set.desc params are used for new topics only\n          pkt.sub.set.desc = setParams.desc;\n        } else if (Tinode.isP2PTopicName(topicName) && setParams.desc.defacs) {\n          // Use optional default permissions only.\n          pkt.sub.set.desc = {\n            defacs: setParams.desc.defacs\n          };\n        }\n      }\n\n      if (setParams.tags) {\n        pkt.sub.set.tags = setParams.tags;\n      }\n    }\n\n    return this.send(pkt, pkt.sub.id);\n  },\n\n  /**\n   * Detach and optionally unsubscribe from the topic\n   * @memberof Tinode#\n   *\n   * @param {String} topic - Topic to detach from.\n   * @param {Boolean} unsub - If <tt>true</tt>, detach and unsubscribe, otherwise just detach.\n   *\n   * @returns {Promise} Promise which will be resolved/rejected on receiving server reply.\n   */\n  leave: function(topic, unsub) {\n    const pkt = this.initPacket('leave', topic);\n    pkt.leave.unsub = unsub;\n\n    return this.send(pkt, pkt.leave.id);\n  },\n\n  /**\n   * Create message draft without sending it to the server.\n   * @memberof Tinode#\n   *\n   * @param {String} topic - Name of the topic to publish to.\n   * @param {Object} data - Payload to publish.\n   * @param {Boolean=} noEcho - If <tt>true</tt>, tell the server not to echo the message to the original session.\n   *\n   * @returns {Object} new message which can be sent to the server or otherwise used.\n   */\n  createMessage: function(topic, data, noEcho) {\n    const pkt = this.initPacket('pub', topic);\n\n    let dft = typeof data == 'string' ? Drafty.parse(data) : data;\n    if (dft && !Drafty.isPlainText(dft)) {\n      pkt.pub.head = {\n        mime: Drafty.getContentType()\n      };\n      data = dft;\n    }\n    pkt.pub.noecho = noEcho;\n    pkt.pub.content = data;\n\n    return pkt.pub;\n  },\n\n  /**\n   * Publish {data} message to topic.\n   * @memberof Tinode#\n   *\n   * @param {String} topic - Name of the topic to publish to.\n   * @param {Object} data - Payload to publish.\n   * @param {Boolean=} noEcho - If <tt>true</tt>, tell the server not to echo the message to the original session.\n   *\n   * @returns {Promise} Promise which will be resolved/rejected on receiving server reply.\n   */\n  publish: function(topic, data, noEcho) {\n    return this.publishMessage(\n      this.createMessage(topic, data, noEcho)\n    );\n  },\n\n  /**\n   * Publish message to topic. The message should be created by {@link Tinode#createMessage}.\n   * @memberof Tinode#\n   *\n   * @param {Object} pub - Message to publish.\n   *\n   * @returns {Promise} Promise which will be resolved/rejected on receiving server reply.\n   */\n  publishMessage: function(pub) {\n    // Make a shallow copy. Needed in order to clear locally-assigned temp values;\n    pub = Object.assign({}, pub);\n    pub.seq = undefined;\n    pub.from = undefined;\n    pub.ts = undefined;\n    return this.send({\n      pub: pub\n    }, pub.id);\n  },\n\n  /**\n   * @typedef GetQuery\n   * @type Object\n   * @memberof Tinode\n   * @property {Tinode.GetOptsType=} desc - If provided (even if empty), fetch topic description.\n   * @property {Tinode.GetOptsType=} sub - If provided (even if empty), fetch topic subscriptions.\n   * @property {Tinode.GetDataType=} data - If provided (even if empty), get messages.\n   */\n\n  /**\n   * @typedef GetOptsType\n   * @type Object\n   * @memberof Tinode\n   * @property {Date=} ims - \"If modified since\", fetch data only it was was modified since stated date.\n   * @property {Number=} limit - Maximum number of results to return. Ignored when querying topic description.\n   */\n\n  /**\n   * @typedef GetDataType\n   * @type Object\n   * @memberof Tinode\n   * @property {Number=} since - Load messages with seq id equal or greater than this value.\n   * @property {Number=} before - Load messages with seq id lower than this number.\n   * @property {Number=} limit - Maximum number of results to return.\n   */\n\n  /**\n   * Request topic metadata\n   * @memberof Tinode#\n   *\n   * @param {String} topic - Name of the topic to query.\n   * @param {Tinode.GetQuery} params - Parameters of the query. Use {Tinode.MetaGetBuilder} to generate.\n   *\n   * @returns {Promise} Promise which will be resolved/rejected on receiving server reply.\n   */\n  getMeta: function(topic, params) {\n    const pkt = this.initPacket('get', topic);\n\n    pkt.get = mergeObj(pkt.get, params);\n\n    return this.send(pkt, pkt.get.id);\n  },\n\n  /**\n   * Update topic's metadata: description, subscribtions.\n   * @memberof Tinode#\n   *\n   * @param {String} topic - Topic to update.\n   * @param {Tinode.SetParams} params - topic metadata to update.\n   * @returns {Promise} Promise which will be resolved/rejected on receiving server reply.\n   */\n  setMeta: function(topic, params) {\n    const pkt = this.initPacket('set', topic);\n    const what = [];\n\n    if (params) {\n      ['desc', 'sub', 'tags', 'cred'].map(function(key) {\n        if (params.hasOwnProperty(key)) {\n          what.push(key);\n          pkt.set[key] = params[key];\n        }\n      });\n    }\n\n    if (what.length == 0) {\n      return Promise.reject(new Error(\"Invalid {set} parameters\"));\n    }\n\n    return this.send(pkt, pkt.set.id);\n  },\n\n  /**\n   * Range of message IDs to delete.\n   *\n   * @typedef DelRange\n   * @type Object\n   * @memberof Tinode\n   * @property {Number} low - low end of the range, inclusive (closed).\n   * @property {Number=} hi - high end of the range, exclusive (open).\n   */\n  /**\n   * Delete some or all messages in a topic.\n   * @memberof Tinode#\n   *\n   * @param {String} topic - Topic name to delete messages from.\n   * @param {Tinode.DelRange[]} list - Ranges of message IDs to delete.\n   * @param {Boolean=} hard - Hard or soft delete\n   *\n   * @returns {Promise} Promise which will be resolved/rejected on receiving server reply.\n   */\n  delMessages: function(topic, ranges, hard) {\n    const pkt = this.initPacket('del', topic);\n\n    pkt.del.what = 'msg';\n    pkt.del.delseq = ranges;\n    pkt.del.hard = hard;\n\n    return this.send(pkt, pkt.del.id);\n  },\n\n  /**\n   * Delete the topic alltogether. Requires Owner permission.\n   * @memberof Tinode#\n   *\n   * @param {String} topic - Name of the topic to delete\n   * @param {Boolean} hard - hard-delete topic.\n   * @returns {Promise} Promise which will be resolved/rejected on receiving server reply.\n   */\n  delTopic: function(topic, hard) {\n    const pkt = this.initPacket('del', topic);\n    pkt.del.what = 'topic';\n    pkt.del.hard = hard;\n\n    return this.send(pkt, pkt.del.id).then((ctrl) => {\n      this.cacheDel('topic', topic);\n      return this.ctrl;\n    });\n  },\n\n  /**\n   * Delete subscription. Requires Share permission.\n   * @memberof Tinode#\n   *\n   * @param {String} topic - Name of the topic to delete\n   * @param {String} user - User ID to remove.\n   * @returns {Promise} Promise which will be resolved/rejected on receiving server reply.\n   */\n  delSubscription: function(topic, user) {\n    const pkt = this.initPacket('del', topic);\n    pkt.del.what = 'sub';\n    pkt.del.user = user;\n\n    return this.send(pkt, pkt.del.id);\n  },\n\n  /**\n   * Delete credential. Always sent on 'me' topic.\n   * @memberof Tinode#\n   *\n   * @param {String} method - validation method such as 'email' or 'tel'.\n   * @param {String} value - validation value, i.e. 'alice@example.com'.\n   * @returns {Promise} Promise which will be resolved/rejected on receiving server reply.\n   */\n  delCredential: function(method, value) {\n    const pkt = this.initPacket('del', TOPIC_ME);\n    pkt.del.what = 'cred';\n    pkt.del.cred = {\n      meth: method,\n      val: value\n    };\n\n    return this.send(pkt, pkt.del.id);\n  },\n\n  /**\n   * Request to delete account of the current user.\n   * @memberof Tinode#\n   *\n   * @param {Boolean} hard - hard-delete user.\n   * @returns {Promise} Promise which will be resolved/rejected on receiving server reply.\n   */\n  delCurrentUser: function(hard) {\n    const pkt = this.initPacket('del', null);\n    pkt.del.what = 'user';\n    pkt.del.hard = hard;\n\n    return this.send(pkt, pkt.del.id).then((ctrl) => {\n      this._myUID = null;\n    });\n  },\n\n  /**\n   * Notify server that a message or messages were read or received. Does NOT return promise.\n   * @memberof Tinode#\n   *\n   * @param {String} topic - Name of the topic where the mesage is being aknowledged.\n   * @param {String} what - Action being aknowledged, either \"read\" or \"recv\".\n   * @param {Number} seq - Maximum id of the message being acknowledged.\n   */\n  note: function(topic, what, seq) {\n    if (seq <= 0 || seq >= LOCAL_SEQID) {\n      throw new Error(\"Invalid message id \" + seq);\n    }\n\n    const pkt = this.initPacket('note', topic);\n    pkt.note.what = what;\n    pkt.note.seq = seq;\n    this.send(pkt);\n  },\n\n  /**\n   * Broadcast a key-press notification to topic subscribers. Used to show\n   * typing notifications \"user X is typing...\".\n   * @memberof Tinode#\n   *\n   * @param {String} topic - Name of the topic to broadcast to.\n   */\n  noteKeyPress: function(topic) {\n    const pkt = this.initPacket('note', topic);\n    pkt.note.what = 'kp';\n    this.send(pkt);\n  },\n\n  /**\n   * Get a named topic, either pull it from cache or create a new instance.\n   * There is a single instance of topic for each name.\n   * @memberof Tinode#\n   *\n   * @param {String} name - Name of the topic to get.\n   * @returns {Tinode.Topic} Requested or newly created topic or <tt>undefined</tt> if topic name is invalid.\n   */\n  getTopic: function(name) {\n    let topic = this.cacheGet('topic', name);\n    if (!topic && name) {\n      if (name == TOPIC_ME) {\n        topic = new TopicMe();\n      } else if (name == TOPIC_FND) {\n        topic = new TopicFnd();\n      } else {\n        topic = new Topic(name);\n      }\n      // topic._new = false;\n      this.cachePut('topic', name, topic);\n      this.attachCacheToTopic(topic);\n    }\n    return topic;\n  },\n\n  /**\n   * Check if named topic is already present in cache.\n   * @memberof Tinode#\n   *\n   * @param {String} name - Name of the topic to check.\n   * @returns {Boolean} true if topic is found in cache, false oterwise.\n   */\n  isTopicCached: function(name) {\n    return !!this.cacheGet('topic', name);\n  },\n\n  /**\n   * Instantiate a new group topic. An actual name will be assigned by the server\n   * on {@link Tinode.Topic.subscribe}.\n   * @memberof Tinode#\n   *\n   * @param {Tinode.Callbacks} callbacks - Object with callbacks for various events.\n   * @returns {Tinode.Topic} Newly created topic.\n   */\n  newTopic: function(callbacks) {\n    const topic = new Topic(TOPIC_NEW, callbacks);\n    this.attachCacheToTopic(topic);\n    return topic;\n  },\n\n  /**\n   * Instantiate a new channel-enabled group topic. An actual name will be assigned by the server\n   * on {@link Tinode.Topic.subscribe}.\n   * @memberof Tinode#\n   *\n   * @param {Tinode.Callbacks} callbacks - Object with callbacks for various events.\n   * @returns {Tinode.Topic} Newly created topic.\n   */\n  newChannel: function(callbacks) {\n    const topic = new Topic(TOPIC_NEW_CHAN, callbacks);\n    this.attachCacheToTopic(topic);\n    return topic;\n  },\n\n  /**\n   * Generate unique name like 'new123456' suitable for creating a new group topic.\n   * @memberof Tinode#\n   *\n   * @param {Boolean} isChan - if the topic is channel-enabled.\n   * @returns {string} name which can be used for creating a new group topic.\n   */\n  newGroupTopicName: function(isChan) {\n    return (isChan ? TOPIC_NEW_CHAN : TOPIC_NEW) + this.getNextUniqueId();\n  },\n\n  /**\n   * Instantiate a new P2P topic with a given peer.\n   * @memberof Tinode#\n   *\n   * @param {string} peer - UID of the peer to start topic with.\n   * @param {Tinode.Callbacks} callbacks - Object with callbacks for various events.\n   * @returns {Tinode.Topic} Newly created topic.\n   */\n  newTopicWith: function(peer, callbacks) {\n    const topic = new Topic(peer, callbacks);\n    this.attachCacheToTopic(topic);\n    return topic;\n  },\n\n  /**\n   * Instantiate 'me' topic or get it from cache.\n   * @memberof Tinode#\n   *\n   * @returns {Tinode.TopicMe} Instance of 'me' topic.\n   */\n  getMeTopic: function() {\n    return this.getTopic(TOPIC_ME);\n  },\n\n  /**\n   * Instantiate 'fnd' (find) topic or get it from cache.\n   * @memberof Tinode#\n   *\n   * @returns {Tinode.Topic} Instance of 'fnd' topic.\n   */\n  getFndTopic: function() {\n    return this.getTopic(TOPIC_FND);\n  },\n\n  /**\n   * Create a new LargeFileHelper instance\n   * @memberof Tinode#\n   *\n   * @returns {Tinode.LargeFileHelper} instance of a LargeFileHelper.\n   */\n  getLargeFileHelper: function() {\n    return new LargeFileHelper(this);\n  },\n\n  /**\n   * Get the UID of the the current authenticated user.\n   * @memberof Tinode#\n   * @returns {string} UID of the current user or <tt>undefined</tt> if the session is not yet authenticated or if there is no session.\n   */\n  getCurrentUserID: function() {\n    return this._myUID;\n  },\n\n  /**\n   * Check if the given user ID is equal to the current user's UID.\n   * @memberof Tinode#\n   * @param {string} uid - UID to check.\n   * @returns {boolean} true if the given UID belongs to the current logged in user.\n   */\n  isMe: function(uid) {\n    return this._myUID === uid;\n  },\n\n  /**\n   * Get login used for last successful authentication.\n   * @memberof Tinode#\n   * @returns {string} login last used successfully or <tt>undefined</tt>.\n   */\n  getCurrentLogin: function() {\n    return this._login;\n  },\n\n  /**\n   * Return information about the server: protocol version and build timestamp.\n   * @memberof Tinode#\n   * @returns {Object} build and version of the server or <tt>null</tt> if there is no connection or if the first server response has not been received yet.\n   */\n  getServerInfo: function() {\n    return this._serverInfo;\n  },\n\n  /**\n   * Return server-provided configuration value (long integer).\n   * @memberof Tinode#\n   * @param {String} name of the value to return\n   * @param {Object} defaultValue to return in case server limit is not set or not found.\n   * @returns {integer} named value.\n   */\n  getServerLimit: function(name, defaultValue) {\n    return (this._serverInfo ? this._serverInfo[name] : null) || defaultValue;\n  },\n\n  /**\n   * Toggle console logging. Logging is off by default.\n   * @memberof Tinode#\n   * @param {boolean} enabled - Set to <tt>true</tt> to enable logging to console.\n   * @param {boolean} trimLongStrings - Set to <tt>true</tt> to trim long strings.\n   */\n  enableLogging: function(enabled, trimLongStrings) {\n    this._loggingEnabled = enabled;\n    this._trimLongStrings = enabled && trimLongStrings;\n  },\n\n  /**\n   * Set UI language to report to the server. Must be called before 'hi' is sent, otherwise it will not be used.\n   * @memberof Tinode#\n   *\n   * @param {String} hl - human (UI) language, like \"en_US\" or \"zh-Hans\".\n   */\n  setHumanLanguage: function(hl) {\n    if (hl) {\n      this._humanLanguage = hl;\n    }\n  },\n\n  /**\n   * Check if given topic is online.\n   * @memberof Tinode#\n   *\n   * @param {String} name of the topic to test.\n   * @returns {Boolean} true if topic is online, false otherwise.\n   */\n  isTopicOnline: function(name) {\n    const me = this.getMeTopic();\n    const cont = me && me.getContact(name);\n    return cont && cont.online;\n  },\n\n  /**\n   * Get access mode for the given contact.\n   * @memberof Tinode#\n   *\n   * @param {String} name of the topic to query.\n   * @returns {AccessMode} access mode if topic is found, null otherwise.\n   */\n  getTopicAccessMode: function(name) {\n    const me = this.getMeTopic();\n    const cont = me && me.getContact(name);\n    return cont ? cont.acs : null;\n  },\n\n  /**\n   * Include message ID into all subsequest messages to server instructin it to send aknowledgemens.\n   * Required for promises to function. Default is \"on\".\n   * @memberof Tinode#\n   *\n   * @param {Boolean} status - Turn aknowledgemens on or off.\n   * @deprecated\n   */\n  wantAkn: function(status) {\n    if (status) {\n      this._messageId = Math.floor((Math.random() * 0xFFFFFF) + 0xFFFFFF);\n    } else {\n      this._messageId = 0;\n    }\n  },\n\n  // Callbacks:\n  /**\n   * Callback to report when the websocket is opened. The callback has no parameters.\n   * @memberof Tinode#\n   * @type {Tinode.onWebsocketOpen}\n   */\n  onWebsocketOpen: undefined,\n\n  /**\n   * @typedef Tinode.ServerParams\n   * @memberof Tinode\n   * @type Object\n   * @property {string} ver - Server version\n   * @property {string} build - Server build\n   * @property {string=} sid - Session ID, long polling connections only.\n   */\n\n  /**\n   * @callback Tinode.onConnect\n   * @param {number} code - Result code\n   * @param {string} text - Text epxplaining the completion, i.e \"OK\" or an error message.\n   * @param {Tinode.ServerParams} params - Parameters returned by the server.\n   */\n  /**\n   * Callback to report when connection with Tinode server is established.\n   * @memberof Tinode#\n   * @type {Tinode.onConnect}\n   */\n  onConnect: undefined,\n\n  /**\n   * Callback to report when connection is lost. The callback has no parameters.\n   * @memberof Tinode#\n   * @type {Tinode.onDisconnect}\n   */\n  onDisconnect: undefined,\n\n  /**\n   * @callback Tinode.onLogin\n   * @param {number} code - NUmeric completion code, same as HTTP status codes.\n   * @param {string} text - Explanation of the completion code.\n   */\n  /**\n   * Callback to report login completion.\n   * @memberof Tinode#\n   * @type {Tinode.onLogin}\n   */\n  onLogin: undefined,\n\n  /**\n   * Callback to receive {ctrl} (control) messages.\n   * @memberof Tinode#\n   * @type {Tinode.onCtrlMessage}\n   */\n  onCtrlMessage: undefined,\n\n  /**\n   * Callback to recieve {data} (content) messages.\n   * @memberof Tinode#\n   * @type {Tinode.onDataMessage}\n   */\n  onDataMessage: undefined,\n\n  /**\n   * Callback to receive {pres} (presence) messages.\n   * @memberof Tinode#\n   * @type {Tinode.onPresMessage}\n   */\n  onPresMessage: undefined,\n\n  /**\n   * Callback to receive all messages as objects.\n   * @memberof Tinode#\n   * @type {Tinode.onMessage}\n   */\n  onMessage: undefined,\n\n  /**\n   * Callback to receive all messages as unparsed text.\n   * @memberof Tinode#\n   * @type {Tinode.onRawMessage}\n   */\n  onRawMessage: undefined,\n\n  /**\n   * Callback to receive server responses to network probes. See {@link Tinode#networkProbe}\n   * @memberof Tinode#\n   * @type {Tinode.onNetworkProbe}\n   */\n  onNetworkProbe: undefined,\n\n  /**\n   * Callback to be notified when exponential backoff is iterating.\n   * @memberof Tinode#\n   * @type {Tinode.onAutoreconnectIteration}\n   */\n  onAutoreconnectIteration: undefined,\n};\n\n/**\n * Helper class for constructing {@link Tinode.GetQuery}.\n *\n * @class MetaGetBuilder\n * @memberof Tinode\n *\n * @param {Tinode.Topic} parent topic which instantiated this builder.\n */\nvar MetaGetBuilder = function(parent) {\n  this.topic = parent;\n  const me = parent._tinode.getMeTopic();\n  this.contact = me && me.getContact(parent.name);\n  this.what = {};\n}\n\nMetaGetBuilder.prototype = {\n\n  // Get latest timestamp\n  _get_ims: function() {\n    const cupd = this.contact && this.contact.updated;\n    const tupd = this.topic._lastDescUpdate || 0;\n    return cupd > tupd ? cupd : tupd;\n  },\n\n  /**\n   * Add query parameters to fetch messages within explicit limits.\n   * @memberof Tinode.MetaGetBuilder#\n   *\n   * @param {Number=} since messages newer than this (inclusive);\n   * @param {Number=} before older than this (exclusive)\n   * @param {Number=} limit number of messages to fetch\n   * @returns {Tinode.MetaGetBuilder} <tt>this</tt> object.\n   */\n  withData: function(since, before, limit) {\n    this.what['data'] = {\n      since: since,\n      before: before,\n      limit: limit\n    };\n    return this;\n  },\n\n  /**\n   * Add query parameters to fetch messages newer than the latest saved message.\n   * @memberof Tinode.MetaGetBuilder#\n   *\n   * @param {Number=} limit number of messages to fetch\n   *\n   * @returns {Tinode.MetaGetBuilder} <tt>this</tt> object.\n   */\n  withLaterData: function(limit) {\n    return this.withData(this.topic._maxSeq > 0 ? this.topic._maxSeq + 1 : undefined, undefined, limit);\n  },\n\n  /**\n   * Add query parameters to fetch messages older than the earliest saved message.\n   * @memberof Tinode.MetaGetBuilder#\n   *\n   * @param {Number=} limit maximum number of messages to fetch.\n   *\n   * @returns {Tinode.MetaGetBuilder} <tt>this</tt> object.\n   */\n  withEarlierData: function(limit) {\n    return this.withData(undefined, this.topic._minSeq > 0 ? this.topic._minSeq : undefined, limit);\n  },\n\n  /**\n   * Add query parameters to fetch topic description if it's newer than the given timestamp.\n   * @memberof Tinode.MetaGetBuilder#\n   *\n   * @param {Date=} ims fetch messages newer than this timestamp.\n   *\n   * @returns {Tinode.MetaGetBuilder} <tt>this</tt> object.\n   */\n  withDesc: function(ims) {\n    this.what['desc'] = {\n      ims: ims\n    };\n    return this;\n  },\n\n  /**\n   * Add query parameters to fetch topic description if it's newer than the last update.\n   * @memberof Tinode.MetaGetBuilder#\n   *\n   * @returns {Tinode.MetaGetBuilder} <tt>this</tt> object.\n   */\n  withLaterDesc: function() {\n    return this.withDesc(this._get_ims());\n  },\n\n  /**\n   * Add query parameters to fetch subscriptions.\n   * @memberof Tinode.MetaGetBuilder#\n   *\n   * @param {Date=} ims fetch subscriptions modified more recently than this timestamp\n   * @param {Number=} limit maximum number of subscriptions to fetch.\n   * @param {String=} userOrTopic user ID or topic name to fetch for fetching one subscription.\n   *\n   * @returns {Tinode.MetaGetBuilder} <tt>this</tt> object.\n   */\n  withSub: function(ims, limit, userOrTopic) {\n    const opts = {\n      ims: ims,\n      limit: limit\n    };\n    if (this.topic.getType() == 'me') {\n      opts.topic = userOrTopic;\n    } else {\n      opts.user = userOrTopic;\n    }\n    this.what['sub'] = opts;\n    return this;\n  },\n\n  /**\n   * Add query parameters to fetch a single subscription.\n   * @memberof Tinode.MetaGetBuilder#\n   *\n   * @param {Date=} ims fetch subscriptions modified more recently than this timestamp\n   * @param {String=} userOrTopic user ID or topic name to fetch for fetching one subscription.\n   *\n   * @returns {Tinode.MetaGetBuilder} <tt>this</tt> object.\n   */\n  withOneSub: function(ims, userOrTopic) {\n    return this.withSub(ims, undefined, userOrTopic);\n  },\n\n  /**\n   * Add query parameters to fetch a single subscription if it's been updated since the last update.\n   * @memberof Tinode.MetaGetBuilder#\n   *\n   * @param {String=} userOrTopic user ID or topic name to fetch for fetching one subscription.\n   *\n   * @returns {Tinode.MetaGetBuilder} <tt>this</tt> object.\n   */\n  withLaterOneSub: function(userOrTopic) {\n    return this.withOneSub(this.topic._lastSubsUpdate, userOrTopic);\n  },\n\n  /**\n   * Add query parameters to fetch subscriptions updated since the last update.\n   * @memberof Tinode.MetaGetBuilder#\n   *\n   * @param {Number=} limit maximum number of subscriptions to fetch.\n   *\n   * @returns {Tinode.MetaGetBuilder} <tt>this</tt> object.\n   */\n  withLaterSub: function(limit) {\n    return this.withSub(this.topic.isP2P() ?\n      this._get_ims() : this.topic._lastSubsUpdate,\n      limit);\n  },\n\n  /**\n   * Add query parameters to fetch topic tags.\n   * @memberof Tinode.MetaGetBuilder#\n   *\n   * @returns {Tinode.MetaGetBuilder} <tt>this</tt> object.\n   */\n  withTags: function() {\n    this.what['tags'] = true;\n    return this;\n  },\n\n  /**\n   * Add query parameters to fetch user's credentials. 'me' topic only.\n   * @memberof Tinode.MetaGetBuilder#\n   *\n   * @returns {Tinode.MetaGetBuilder} <tt>this</tt> object.\n   */\n  withCred: function() {\n    if (this.topic.getType() == 'me') {\n      this.what['cred'] = true;\n    } else {\n      this.topic._tinode.logger(\"ERROR: Invalid topic type for MetaGetBuilder:withCreds\", this.topic.getType());\n    }\n    return this;\n  },\n\n  /**\n   * Add query parameters to fetch deleted messages within explicit limits. Any/all parameters can be null.\n   * @memberof Tinode.MetaGetBuilder#\n   *\n   * @param {Number=} since ids of messages deleted since this 'del' id (inclusive)\n   * @param {Number=} limit number of deleted message ids to fetch\n   *\n   * @returns {Tinode.MetaGetBuilder} <tt>this</tt> object.\n   */\n  withDel: function(since, limit) {\n    if (since || limit) {\n      this.what['del'] = {\n        since: since,\n        limit: limit\n      };\n    }\n    return this;\n  },\n\n  /**\n   * Add query parameters to fetch messages deleted after the saved 'del' id.\n   * @memberof Tinode.MetaGetBuilder#\n   *\n   * @param {Number=} limit number of deleted message ids to fetch\n   *\n   * @returns {Tinode.MetaGetBuilder} <tt>this</tt> object.\n   */\n  withLaterDel: function(limit) {\n    // Specify 'since' only if we have already received some messages. If\n    // we have no locally cached messages then we don't care if any messages were deleted.\n    return this.withDel(this.topic._maxSeq > 0 ? this.topic._maxDel + 1 : undefined, limit);\n  },\n\n  /**\n   * Construct parameters\n   * @memberof Tinode.MetaGetBuilder#\n   *\n   * @returns {Tinode.GetQuery} Get query\n   */\n  build: function() {\n    const what = [];\n    const instance = this;\n    let params = {};\n    ['data', 'sub', 'desc', 'tags', 'cred', 'del'].map(function(key) {\n      if (instance.what.hasOwnProperty(key)) {\n        what.push(key);\n        if (Object.getOwnPropertyNames(instance.what[key]).length > 0) {\n          params[key] = instance.what[key];\n        }\n      }\n    });\n    if (what.length > 0) {\n      params.what = what.join(' ');\n    } else {\n      params = undefined;\n    }\n    return params;\n  }\n};\n\n/**\n * Helper class for handling access mode.\n *\n * @class AccessMode\n * @memberof Tinode\n *\n * @param {AccessMode|Object=} acs AccessMode to copy or access mode object received from the server.\n */\nvar AccessMode = function(acs) {\n  if (acs) {\n    this.given = typeof acs.given == 'number' ? acs.given : AccessMode.decode(acs.given);\n    this.want = typeof acs.want == 'number' ? acs.want : AccessMode.decode(acs.want);\n    this.mode = acs.mode ? (typeof acs.mode == 'number' ? acs.mode : AccessMode.decode(acs.mode)) :\n      (this.given & this.want);\n  }\n};\n\nAccessMode._NONE = 0x00;\nAccessMode._JOIN = 0x01;\nAccessMode._READ = 0x02;\nAccessMode._WRITE = 0x04;\nAccessMode._PRES = 0x08;\nAccessMode._APPROVE = 0x10;\nAccessMode._SHARE = 0x20;\nAccessMode._DELETE = 0x40;\nAccessMode._OWNER = 0x80;\n\nAccessMode._BITMASK = AccessMode._JOIN | AccessMode._READ | AccessMode._WRITE | AccessMode._PRES |\n  AccessMode._APPROVE | AccessMode._SHARE | AccessMode._DELETE | AccessMode._OWNER;\nAccessMode._INVALID = 0x100000;\n\nAccessMode._checkFlag = function(val, side, flag) {\n  side = side || 'mode';\n  if (['given', 'want', 'mode'].includes(side)) {\n    return ((val[side] & flag) != 0);\n  }\n  throw new Error(\"Invalid AccessMode component '\" + side + \"'\");\n}\n\n/**\n * Parse string into an access mode value.\n * @memberof Tinode.AccessMode\n * @static\n *\n * @param {string | number} mode - either a String representation of the access mode to parse or a set of bits to assign.\n * @returns {number} - Access mode as a numeric value.\n */\nAccessMode.decode = function(str) {\n  if (!str) {\n    return null;\n  } else if (typeof str == 'number') {\n    return str & AccessMode._BITMASK;\n  } else if (str === 'N' || str === 'n') {\n    return AccessMode._NONE;\n  }\n\n  const bitmask = {\n    'J': AccessMode._JOIN,\n    'R': AccessMode._READ,\n    'W': AccessMode._WRITE,\n    'P': AccessMode._PRES,\n    'A': AccessMode._APPROVE,\n    'S': AccessMode._SHARE,\n    'D': AccessMode._DELETE,\n    'O': AccessMode._OWNER\n  };\n\n  let m0 = AccessMode._NONE;\n\n  for (let i = 0; i < str.length; i++) {\n    const bit = bitmask[str.charAt(i).toUpperCase()];\n    if (!bit) {\n      // Unrecognized bit, skip.\n      continue;\n    }\n    m0 |= bit;\n  }\n  return m0;\n};\n\n/**\n * Convert numeric representation of the access mode into a string.\n *\n * @memberof Tinode.AccessMode\n * @static\n *\n * @param {number} val - access mode value to convert to a string.\n * @returns {string} - Access mode as a string.\n */\nAccessMode.encode = function(val) {\n  if (val === null || val === AccessMode._INVALID) {\n    return null;\n  } else if (val === AccessMode._NONE) {\n    return 'N';\n  }\n\n  const bitmask = ['J', 'R', 'W', 'P', 'A', 'S', 'D', 'O'];\n  let res = '';\n  for (let i = 0; i < bitmask.length; i++) {\n    if ((val & (1 << i)) != 0) {\n      res = res + bitmask[i];\n    }\n  }\n  return res;\n};\n\n/**\n * Update numeric representation of access mode with the new value. The value\n * is one of the following:\n *  - a string starting with '+' or '-' then the bits to add or remove, e.g. '+R-W' or '-PS'.\n *  - a new value of access mode\n *\n * @memberof Tinode.AccessMode\n * @static\n *\n * @param {number} val - access mode value to update.\n * @param {string} upd - update to apply to val.\n * @returns {number} - updated access mode.\n */\nAccessMode.update = function(val, upd) {\n  if (!upd || typeof upd != 'string') {\n    return val;\n  }\n\n  let action = upd.charAt(0);\n  if (action == '+' || action == '-') {\n    let val0 = val;\n    // Split delta-string like '+ABC-DEF+Z' into an array of parts including + and -.\n    const parts = upd.split(/([-+])/);\n    // Starting iteration from 1 because String.split() creates an array with the first empty element.\n    // Iterating by 2 because we parse pairs +/- then data.\n    for (let i = 1; i < parts.length - 1; i += 2) {\n      action = parts[i];\n      const m0 = AccessMode.decode(parts[i + 1]);\n      if (m0 == AccessMode._INVALID) {\n        return val;\n      }\n      if (m0 == null) {\n        continue;\n      }\n      if (action === '+') {\n        val0 |= m0;\n      } else if (action === '-') {\n        val0 &= ~m0;\n      }\n    }\n    val = val0;\n  } else {\n    // The string is an explicit new value 'ABC' rather than delta.\n    const val0 = AccessMode.decode(upd);\n    if (val0 != AccessMode._INVALID) {\n      val = val0;\n    }\n  }\n\n  return val;\n};\n\n/**\n * Bits present in a1 but missing in a2.\n *\n * @static\n * @memberof Tinode\n *\n * @param {number | string} a1 - access mode to subtract from.\n * @param {number | string} a2 - access mode to subtract.\n * @returns {number} access mode with bits present in a1 but missing in a2\n */\nAccessMode.diff = function(a1, a2) {\n  a1 = AccessMode.decode(a1);\n  a2 = AccessMode.decode(a2);\n\n  if (a1 == AccessMode._INVALID || a2 == AccessMode._INVALID) {\n    return AccessMode._INVALID;\n  }\n  return a1 & ~a2;\n};\n\n/**\n * AccessMode is a class representing topic access mode.\n *\n * @memberof Tinode\n * @class AccessMode\n */\nAccessMode.prototype = {\n  /**\n   * Custom formatter\n   */\n  toString: function() {\n    return '{\"mode\": \"' + AccessMode.encode(this.mode) +\n      '\", \"given\": \"' + AccessMode.encode(this.given) +\n      '\", \"want\": \"' + AccessMode.encode(this.want) + '\"}';\n  },\n  /**\n   * Convert numeric values to strings.\n   */\n  jsonHelper: function() {\n    return {\n      mode: AccessMode.encode(this.mode),\n      given: AccessMode.encode(this.given),\n      want: AccessMode.encode(this.want)\n    };\n  },\n  /**\n   * Assign value to 'mode'.\n   * @memberof Tinode.AccessMode\n   *\n   * @param {string | number} m - either a string representation of the access mode or a set of bits.\n   * @returns {AccessMode} - <b>this</b> AccessMode.\n   */\n  setMode: function(m) {\n    this.mode = AccessMode.decode(m);\n    return this;\n  },\n  /**\n   * Update 'mode' value.\n   * @memberof Tinode.AccessMode\n   *\n   * @param {string} u - string representation of the changes to apply to access mode.\n   * @returns {AccessMode} - <b>this</b> AccessMode.\n   */\n  updateMode: function(u) {\n    this.mode = AccessMode.update(this.mode, u);\n    return this;\n  },\n  /**\n   * Get 'mode' value as a string.\n   * @memberof Tinode.AccessMode\n   *\n   * @returns {string} - <b>mode</b> value.\n   */\n  getMode: function() {\n    return AccessMode.encode(this.mode);\n  },\n\n  /**\n   * Assign 'given' value.\n   * @memberof Tinode.AccessMode\n   *\n   * @param {string | number} g - either a string representation of the access mode or a set of bits.\n   * @returns {AccessMode} - <b>this</b> AccessMode.\n   */\n  setGiven: function(g) {\n    this.given = AccessMode.decode(g);\n    return this;\n  },\n  /**\n   * Update 'given' value.\n   * @memberof Tinode.AccessMode\n   *\n   * @param {string} u - string representation of the changes to apply to access mode.\n   * @returns {AccessMode} - <b>this</b> AccessMode.\n   */\n  updateGiven: function(u) {\n    this.given = AccessMode.update(this.given, u);\n    return this;\n  },\n  /**\n   * Get 'given' value as a string.\n   * @memberof Tinode.AccessMode\n   *\n   * @returns {string} - <b>given</b> value.\n   */\n  getGiven: function() {\n    return AccessMode.encode(this.given);\n  },\n\n  /**\n   * Assign 'want' value.\n   * @memberof Tinode.AccessMode\n   *\n   * @param {string | number} w - either a string representation of the access mode or a set of bits.\n   * @returns {AccessMode} - <b>this</b> AccessMode.\n   */\n  setWant: function(w) {\n    this.want = AccessMode.decode(w);\n    return this;\n  },\n  /**\n   * Update 'want' value.\n   * @memberof Tinode.AccessMode\n   *\n   * @param {string} u - string representation of the changes to apply to access mode.\n   * @returns {AccessMode} - <b>this</b> AccessMode.\n   */\n  updateWant: function(u) {\n    this.want = AccessMode.update(this.want, u);\n    return this;\n  },\n  /**\n   * Get 'want' value as a string.\n   * @memberof Tinode.AccessMode\n   *\n   * @returns {string} - <b>want</b> value.\n   */\n  getWant: function() {\n    return AccessMode.encode(this.want);\n  },\n\n  /**\n   * Get permissions present in 'want' but missing in 'given'.\n   * Inverse of {@link Tinode.AccessMode#getExcessive}\n   *\n   * @memberof Tinode.AccessMode\n   *\n   * @returns {string} permissions present in <b>want</b> but missing in <b>given</b>.\n   */\n  getMissing: function() {\n    return AccessMode.encode(this.want & ~this.given);\n  },\n\n  /**\n   * Get permissions present in 'given' but missing in 'want'.\n   * Inverse of {@link Tinode.AccessMode#getMissing}\n   * @memberof Tinode.AccessMode\n   *\n   * @returns {string} permissions present in <b>given</b> but missing in <b>want</b>.\n   */\n  getExcessive: function() {\n    return AccessMode.encode(this.given & ~this.want);\n  },\n\n  /**\n   * Update 'want', 'give', and 'mode' values.\n   * @memberof Tinode.AccessMode\n   *\n   * @param {AccessMode} val - new access mode value.\n   * @returns {AccessMode} - <b>this</b> AccessMode.\n   */\n  updateAll: function(val) {\n    if (val) {\n      this.updateGiven(val.given);\n      this.updateWant(val.want);\n      this.mode = this.given & this.want;\n    }\n    return this;\n  },\n\n  /**\n   * Check if Owner (O) flag is set.\n   * @memberof Tinode.AccessMode\n   * @param {string=} side - which permission to check: given, want, mode; default: mode.\n   * @returns {boolean} - true if flag is set.\n   */\n  isOwner: function(side) {\n    return AccessMode._checkFlag(this, side, AccessMode._OWNER);\n  },\n\n  /**\n   * Check if Presence (P) flag is set.\n   * @memberof Tinode.AccessMode\n   * @param {string=} side - which permission to check: given, want, mode; default: mode.\n   * @returns {boolean} - true if flag is set.\n   */\n  isPresencer: function(side) {\n    return AccessMode._checkFlag(this, side, AccessMode._PRES);\n  },\n\n  /**\n   * Check if Presence (P) flag is NOT set.\n   * @memberof Tinode.AccessMode\n   * @param {string=} side - which permission to check: given, want, mode; default: mode.\n   * @returns {boolean} - true if flag is set.\n   */\n  isMuted: function(side) {\n    return !this.isPresencer(side);\n  },\n\n  /**\n   * Check if Join (J) flag is set.\n   * @memberof Tinode.AccessMode\n   * @param {string=} side - which permission to check: given, want, mode; default: mode.\n   * @returns {boolean} - true if flag is set.\n   */\n  isJoiner: function(side) {\n    return AccessMode._checkFlag(this, side, AccessMode._JOIN);\n  },\n\n  /**\n   * Check if Reader (R) flag is set.\n   * @memberof Tinode.AccessMode\n   * @param {string=} side - which permission to check: given, want, mode; default: mode.\n   * @returns {boolean} - true if flag is set.\n   */\n  isReader: function(side) {\n    return AccessMode._checkFlag(this, side, AccessMode._READ);\n  },\n\n  /**\n   * Check if Writer (W) flag is set.\n   * @memberof Tinode.AccessMode\n   * @param {string=} side - which permission to check: given, want, mode; default: mode.\n   * @returns {boolean} - true if flag is set.\n   */\n  isWriter: function(side) {\n    return AccessMode._checkFlag(this, side, AccessMode._WRITE);\n  },\n\n  /**\n   * Check if Approver (A) flag is set.\n   * @memberof Tinode.AccessMode\n   * @param {string=} side - which permission to check: given, want, mode; default: mode.\n   * @returns {boolean} - true if flag is set.\n   */\n  isApprover: function(side) {\n    return AccessMode._checkFlag(this, side, AccessMode._APPROVE);\n  },\n\n  /**\n   * Check if either one of Owner (O) or Approver (A) flags is set.\n   * @memberof Tinode.AccessMode\n   * @param {string=} side - which permission to check: given, want, mode; default: mode.\n   * @returns {boolean} - true if flag is set.\n   */\n  isAdmin: function(side) {\n    return this.isOwner(side) || this.isApprover(side);\n  },\n\n  /**\n   * Check if either one of Owner (O), Approver (A), or Sharer (S) flags is set.\n   * @memberof Tinode.AccessMode\n   * @param {string=} side - which permission to check: given, want, mode; default: mode.\n   * @returns {boolean} - true if flag is set.\n   */\n  isSharer: function(side) {\n    return this.isAdmin(side) || AccessMode._checkFlag(this, side, AccessMode._SHARE);\n  },\n\n  /**\n   * Check if Deleter (D) flag is set.\n   * @memberof Tinode.AccessMode\n   * @param {string=} side - which permission to check: given, want, mode; default: mode.\n   * @returns {boolean} - true if flag is set.\n   */\n  isDeleter: function(side) {\n    return AccessMode._checkFlag(this, side, AccessMode._DELETE);\n  }\n};\n\n/**\n * @callback Tinode.Topic.onData\n * @param {Data} data - Data packet\n */\n/**\n * Topic is a class representing a logical communication channel.\n * @class Topic\n * @memberof Tinode\n *\n * @param {string} name - Name of the topic to create.\n * @param {Object=} callbacks - Object with various event callbacks.\n * @param {Tinode.Topic.onData} callbacks.onData - Callback which receives a {data} message.\n * @param {callback} callbacks.onMeta - Callback which receives a {meta} message.\n * @param {callback} callbacks.onPres - Callback which receives a {pres} message.\n * @param {callback} callbacks.onInfo - Callback which receives an {info} message.\n * @param {callback} callbacks.onMetaDesc - Callback which receives changes to topic desctioption {@link desc}.\n * @param {callback} callbacks.onMetaSub - Called for a single subscription record change.\n * @param {callback} callbacks.onSubsUpdated - Called after a batch of subscription changes have been recieved and cached.\n * @param {callback} callbacks.onDeleteTopic - Called after the topic is deleted.\n * @param {callback} callbacls.onAllMessagesReceived - Called when all requested {data} messages have been recived.\n */\nvar Topic = function(name, callbacks) {\n  // Parent Tinode object.\n  this._tinode = null;\n\n  // Server-provided data, locally immutable.\n  // topic name\n  this.name = name;\n  // timestamp when the topic was created\n  this.created = null;\n  // timestamp when the topic was last updated\n  this.updated = null;\n  // timestamp of the last messages\n  this.touched = null;\n  // access mode, see AccessMode\n  this.acs = new AccessMode(null);\n  // per-topic private data\n  this.private = null;\n  // per-topic public data\n  this.public = null;\n\n  // Locally cached data\n  // Subscribed users, for tracking read/recv/msg notifications.\n  this._users = {};\n\n  // Current value of locally issued seqId, used for pending messages.\n  this._queuedSeqId = LOCAL_SEQID;\n\n  // The maximum known {data.seq} value.\n  this._maxSeq = 0;\n  // The minimum known {data.seq} value.\n  this._minSeq = 0;\n  // Indicator that the last request for earlier messages returned 0.\n  this._noEarlierMsgs = false;\n  // The maximum known deletion ID.\n  this._maxDel = 0;\n  // User discovery tags\n  this._tags = [];\n  // Credentials such as email or phone number.\n  this._credentials = [];\n  // Message cache, sorted by message seq values, from old to new.\n  this._messages = CBuffer(function(a, b) {\n    return a.seq - b.seq;\n  }, true);\n  // Boolean, true if the topic is currently live\n  this._subscribed = false;\n  // Timestap when topic meta-desc update was recived.\n  this._lastDescUpdate = null;\n  // Timestap when topic meta-subs update was recived.\n  this._lastSubsUpdate = null;\n  // Topic created but not yet synced with the server. Used only during initialization.\n  this._new = true;\n\n  // Callbacks\n  if (callbacks) {\n    this.onData = callbacks.onData;\n    this.onMeta = callbacks.onMeta;\n    this.onPres = callbacks.onPres;\n    this.onInfo = callbacks.onInfo;\n    // A single desc update;\n    this.onMetaDesc = callbacks.onMetaDesc;\n    // A single subscription record;\n    this.onMetaSub = callbacks.onMetaSub;\n    // All subscription records received;\n    this.onSubsUpdated = callbacks.onSubsUpdated;\n    this.onTagsUpdated = callbacks.onTagsUpdated;\n    this.onCredsUpdated = callbacks.onCredsUpdated;\n    this.onDeleteTopic = callbacks.onDeleteTopic;\n    this.onAllMessagesReceived = callbacks.onAllMessagesReceived;\n  }\n};\n\nTopic.prototype = {\n  /**\n   * Check if the topic is subscribed.\n   * @memberof Tinode.Topic#\n   * @returns {boolean} True is topic is attached/subscribed, false otherwise.\n   */\n  isSubscribed: function() {\n    return this._subscribed;\n  },\n\n  /**\n   * Request topic to subscribe. Wrapper for {@link Tinode#subscribe}.\n   * @memberof Tinode.Topic#\n   *\n   * @param {Tinode.GetQuery=} getParams - get query parameters.\n   * @param {Tinode.SetParams=} setParams - set parameters.\n   * @returns {Promise} Promise to be resolved/rejected when the server responds to the request.\n   */\n  subscribe: function(getParams, setParams) {\n    // If the topic is already subscribed, return resolved promise\n    if (this._subscribed) {\n      return Promise.resolve(this);\n    }\n\n    // Send subscribe message, handle async response.\n    // If topic name is explicitly provided, use it. If no name, then it's a new group topic,\n    // use \"new\".\n    return this._tinode.subscribe(this.name || TOPIC_NEW, getParams, setParams).then((ctrl) => {\n      if (ctrl.code >= 300) {\n        // Do nothing if subscription status has not changed.\n        return ctrl;\n      }\n\n      this._subscribed = true;\n      this.acs = (ctrl.params && ctrl.params.acs) ? ctrl.params.acs : this.acs;\n\n      // Set topic name for new topics and add it to cache.\n      if (this._new) {\n        this._new = false;\n\n        // Name may change new123456 -> grpAbCdEf\n        this.name = ctrl.topic;\n\n        this.created = ctrl.ts;\n        this.updated = ctrl.ts;\n        // Don't assign touched, otherwise topic will be put on top of the list on subscribe.\n\n        this._cachePutSelf();\n\n        if (this.name != TOPIC_ME && this.name != TOPIC_FND) {\n          // Add the new topic to the list of contacts maintained by the 'me' topic.\n          const me = this._tinode.getMeTopic();\n          if (me) {\n            me._processMetaSub([{\n              _noForwarding: true,\n              topic: this.name,\n              created: ctrl.ts,\n              updated: ctrl.ts,\n              acs: this.acs\n            }]);\n          }\n        }\n\n        if (setParams && setParams.desc) {\n          setParams.desc._noForwarding = true;\n          this._processMetaDesc(setParams.desc);\n        }\n      }\n\n      return ctrl;\n    });\n  },\n\n  /**\n   * Create a draft of a message without sending it to the server.\n   * @memberof Tinode.Topic#\n   *\n   * @param {string | Object} data - Content to wrap in a draft.\n   * @param {Boolean=} noEcho - If <tt>true</tt> server will not echo message back to originating\n   * session. Otherwise the server will send a copy of the message to sender.\n   *\n   * @returns {Object} message draft.\n   */\n  createMessage: function(data, noEcho) {\n    return this._tinode.createMessage(this.name, data, noEcho);\n  },\n\n  /**\n   * Immediately publish data to topic. Wrapper for {@link Tinode#publish}.\n   * @memberof Tinode.Topic#\n   *\n   * @param {string | Object} data - Data to publish, either plain string or a Drafty object.\n   * @param {Boolean=} noEcho - If <tt>true</tt> server will not echo message back to originating\n   * @returns {Promise} Promise to be resolved/rejected when the server responds to the request.\n   */\n  publish: function(data, noEcho) {\n    return this.publishMessage(this.createMessage(data, noEcho));\n  },\n\n  /**\n   * Publish message created by {@link Tinode.Topic#createMessage}.\n   * @memberof Tinode.Topic#\n   *\n   * @param {Object} pub - {data} object to publish. Must be created by {@link Tinode.Topic#createMessage}\n   *\n   * @returns {Promise} Promise to be resolved/rejected when the server responds to the request.\n   */\n  publishMessage: function(pub) {\n    if (!this._subscribed) {\n      return Promise.reject(new Error(\"Cannot publish on inactive topic\"));\n    }\n\n    // Update header with attachment records.\n    if (Drafty.hasAttachments(pub.content) && !pub.head.attachments) {\n      let attachments = [];\n      Drafty.attachments(pub.content, (data) => {\n        attachments.push(data.ref);\n      });\n      pub.head.attachments = attachments;\n    }\n\n    // Send data.\n    pub._sending = true;\n    pub._failed = false;\n    return this._tinode.publishMessage(pub).then((ctrl) => {\n      pub._sending = false;\n      pub.ts = ctrl.ts;\n      this.swapMessageId(pub, ctrl.params.seq);\n      this._routeData(pub);\n      return ctrl;\n    }).catch((err) => {\n      this._tinode.logger(\"WARNING: Message rejected by the server\", err);\n      pub._sending = false;\n      pub._failed = true;\n      if (this.onData) {\n        this.onData();\n      }\n    });\n  },\n\n  /**\n   * Add message to local message cache, send to the server when the promise is resolved.\n   * If promise is null or undefined, the message will be sent immediately.\n   * The message is sent when the\n   * The message should be created by {@link Tinode.Topic#createMessage}.\n   * This is probably not the final API.\n   * @memberof Tinode.Topic#\n   *\n   * @param {Object} pub - Message to use as a draft.\n   * @param {Promise} prom - Message will be sent when this promise is resolved, discarded if rejected.\n   *\n   * @returns {Promise} derived promise.\n   */\n  publishDraft: function(pub, prom) {\n    if (!prom && !this._subscribed) {\n      return Promise.reject(new Error(\"Cannot publish on inactive topic\"));\n    }\n\n    const seq = pub.seq || this._getQueuedSeqId();\n    if (!pub._noForwarding) {\n      // The 'seq', 'ts', and 'from' are added to mimic {data}. They are removed later\n      // before the message is sent.\n\n      pub._noForwarding = true;\n      pub.seq = seq;\n      pub.ts = new Date();\n      pub.from = this._tinode.getCurrentUserID();\n\n      // Don't need an echo message because the message is added to local cache right away.\n      pub.noecho = true;\n      // Add to cache.\n      this._messages.put(pub);\n\n      if (this.onData) {\n        this.onData(pub);\n      }\n    }\n    // If promise is provided, send the queued message when it's resolved.\n    // If no promise is provided, create a resolved one and send immediately.\n    prom = (prom || Promise.resolve()).then(\n      ( /* argument ignored */ ) => {\n        if (pub._cancelled) {\n          return {\n            code: 300,\n            text: \"cancelled\"\n          };\n        }\n        return this.publishMessage(pub);\n      },\n      (err) => {\n        this._tinode.logger(\"WARNING: Message draft rejected\", err);\n        pub._sending = false;\n        pub._failed = true;\n        this._messages.delAt(this._messages.find(pub));\n        if (this.onData) {\n          this.onData();\n        }\n      });\n    return prom;\n  },\n\n  /**\n   * Leave the topic, optionally unsibscribe. Leaving the topic means the topic will stop\n   * receiving updates from the server. Unsubscribing will terminate user's relationship with the topic.\n   * Wrapper for {@link Tinode#leave}.\n   * @memberof Tinode.Topic#\n   *\n   * @param {Boolean=} unsub - If true, unsubscribe, otherwise just leave.\n   * @returns {Promise} Promise to be resolved/rejected when the server responds to the request.\n   */\n  leave: function(unsub) {\n    // It's possible to unsubscribe (unsub==true) from inactive topic.\n    if (!this._subscribed && !unsub) {\n      return Promise.reject(new Error(\"Cannot leave inactive topic\"));\n    }\n\n    // Send a 'leave' message, handle async response\n    return this._tinode.leave(this.name, unsub).then((ctrl) => {\n      this._resetSub();\n      if (unsub) {\n        this._tinode.cacheDel('topic', this.name);\n        this._gone();\n      }\n      return ctrl;\n    });\n  },\n\n  /**\n   * Request topic metadata from the server.\n   * @memberof Tinode.Topic#\n   *\n   * @param {Tinode.GetQuery} request parameters\n   *\n   * @returns {Promise} Promise to be resolved/rejected when the server responds to request.\n   */\n  getMeta: function(params) {\n    // Send {get} message, return promise.\n    return this._tinode.getMeta(this.name, params);\n  },\n\n  /**\n   * Request more messages from the server\n   * @memberof Tinode.Topic#\n   *\n   * @param {integer} limit number of messages to get.\n   * @param {boolean} forward if true, request newer messages.\n   */\n  getMessagesPage: function(limit, forward) {\n    const query = this.startMetaQuery();\n    if (forward) {\n      query.withLaterData(limit);\n    } else {\n      query.withEarlierData(limit);\n    }\n    let promise = this.getMeta(query.build());\n    if (!forward) {\n      promise = promise.then((ctrl) => {\n        if (ctrl && ctrl.params && !ctrl.params.count) {\n          this._noEarlierMsgs = true;\n        }\n      });\n    }\n    return promise;\n  },\n\n  /**\n   * Update topic metadata.\n   * @memberof Tinode.Topic#\n   *\n   * @param {Tinode.SetParams} params parameters to update.\n   * @returns {Promise} Promise to be resolved/rejected when the server responds to request.\n   */\n  setMeta: function(params) {\n    if (params.tags) {\n      params.tags = normalizeArray(params.tags);\n    }\n    // Send Set message, handle async response.\n    return this._tinode.setMeta(this.name, params)\n      .then((ctrl) => {\n        if (ctrl && ctrl.code >= 300) {\n          // Not modified\n          return ctrl;\n        }\n\n        if (params.sub) {\n          params.sub.topic = this.name;\n          if (ctrl.params && ctrl.params.acs) {\n            params.sub.acs = ctrl.params.acs;\n            params.sub.updated = ctrl.ts;\n          }\n          if (!params.sub.user) {\n            // This is a subscription update of the current user.\n            // Assign user ID otherwise the update will be ignored by _processMetaSub.\n            params.sub.user = this._tinode.getCurrentUserID();\n            if (!params.desc) {\n              // Force update to topic's asc.\n              params.desc = {};\n            }\n          }\n          params.sub._noForwarding = true;\n          this._processMetaSub([params.sub]);\n        }\n\n        if (params.desc) {\n          if (ctrl.params && ctrl.params.acs) {\n            params.desc.acs = ctrl.params.acs;\n            params.desc.updated = ctrl.ts;\n          }\n          this._processMetaDesc(params.desc);\n        }\n\n        if (params.tags) {\n          this._processMetaTags(params.tags);\n        }\n        if (params.cred) {\n          this._processMetaCreds([params.cred], true);\n        }\n\n        return ctrl;\n      });\n  },\n\n  /**\n   * Update access mode of the current user or of another topic subsriber.\n   * @memberof Tinode.Topic#\n   *\n   * @param {string} uid - UID of the user to update or null to update current user.\n   * @param {string} update - the update value, full or delta.\n   * @returns {Promise} Promise to be resolved/rejected when the server responds to request.\n   */\n  updateMode: function(uid, update) {\n    const user = uid ? this.subscriber(uid) : null;\n    const am = user ?\n      user.acs.updateGiven(update).getGiven() :\n      this.getAccessMode().updateWant(update).getWant();\n\n    return this.setMeta({\n      sub: {\n        user: uid,\n        mode: am\n      }\n    });\n  },\n\n  /**\n   * Create new topic subscription. Wrapper for {@link Tinode#setMeta}.\n   * @memberof Tinode.Topic#\n   *\n   * @param {String} uid - ID of the user to invite\n   * @param {String=} mode - Access mode. <tt>null</tt> means to use default.\n   *\n   * @returns {Promise} Promise to be resolved/rejected when the server responds to request.\n   */\n  invite: function(uid, mode) {\n    return this.setMeta({\n      sub: {\n        user: uid,\n        mode: mode\n      }\n    });\n  },\n\n  /**\n   * Archive or un-archive the topic. Wrapper for {@link Tinode#setMeta}.\n   * @memberof Tinode.Topic#\n   *\n   * @param {Boolean} arch - true to archive the topic, false otherwise.\n   *\n   * @returns {Promise} Promise to be resolved/rejected when the server responds to request.\n   */\n  archive: function(arch) {\n    if (this.private && this.private.arch == arch) {\n      return Promise.resolve(arch);\n    }\n    return this.setMeta({\n      desc: {\n        private: {\n          arch: arch ? true : Tinode.DEL_CHAR\n        }\n      }\n    });\n  },\n\n  /**\n   * Delete messages. Hard-deleting messages requires Owner permission.\n   * Wrapper for {@link Tinode#delMessages}.\n   * @memberof Tinode.Topic#\n   *\n   * @param {Tinode.DelRange[]} ranges - Ranges of message IDs to delete.\n   * @param {Boolean=} hard - Hard or soft delete\n   * @returns {Promise} Promise to be resolved/rejected when the server responds to request.\n   */\n  delMessages: function(ranges, hard) {\n    if (!this._subscribed) {\n      return Promise.reject(new Error(\"Cannot delete messages in inactive topic\"));\n    }\n\n    // Sort ranges in accending order by low, the descending by hi.\n    ranges.sort((r1, r2) => {\n      if (r1.low < r2.low) {\n        return true;\n      }\n      if (r1.low == r2.low) {\n        return !r2.hi || (r1.hi >= r2.hi);\n      }\n      return false;\n    });\n\n    // Remove pending messages from ranges possibly clipping some ranges.\n    let tosend = ranges.reduce((out, r) => {\n      if (r.low < LOCAL_SEQID) {\n        if (!r.hi || r.hi < LOCAL_SEQID) {\n          out.push(r);\n        } else {\n          // Clip hi to max allowed value.\n          out.push({\n            low: r.low,\n            hi: this._maxSeq + 1\n          });\n        }\n      }\n      return out;\n    }, []);\n\n    // Send {del} message, return promise\n    let result;\n    if (tosend.length > 0) {\n      result = this._tinode.delMessages(this.name, tosend, hard);\n    } else {\n      result = Promise.resolve({\n        params: {\n          del: 0\n        }\n      });\n    }\n    // Update local cache.\n    return result.then((ctrl) => {\n      if (ctrl.params.del > this._maxDel) {\n        this._maxDel = ctrl.params.del;\n      }\n\n      ranges.map((r) => {\n        if (r.hi) {\n          this.flushMessageRange(r.low, r.hi);\n        } else {\n          this.flushMessage(r.low);\n        }\n      });\n\n      this._updateDeletedRanges();\n\n      if (this.onData) {\n        // Calling with no parameters to indicate the messages were deleted.\n        this.onData();\n      }\n      return ctrl;\n    });\n  },\n\n  /**\n   * Delete all messages. Hard-deleting messages requires Owner permission.\n   * @memberof Tinode.Topic#\n   *\n   * @param {boolean} hardDel - true if messages should be hard-deleted.\n   *\n   * @returns {Promise} Promise to be resolved/rejected when the server responds to request.\n   */\n  delMessagesAll: function(hardDel) {\n    if (!this._maxSeq || this._maxSeq <= 0) {\n      // There are no messages to delete.\n      return Promise.resolve();\n    }\n    return this.delMessages([{\n      low: 1,\n      hi: this._maxSeq + 1,\n      _all: true\n    }], hardDel);\n  },\n\n  /**\n   * Delete multiple messages defined by their IDs. Hard-deleting messages requires Owner permission.\n   * @memberof Tinode.Topic#\n   *\n   * @param {Tinode.DelRange[]} list - list of seq IDs to delete\n   * @param {Boolean=} hardDel - true if messages should be hard-deleted.\n   *\n   * @returns {Promise} Promise to be resolved/rejected when the server responds to request.\n   */\n  delMessagesList: function(list, hardDel) {\n    // Sort the list in ascending order\n    list.sort((a, b) => a - b);\n    // Convert the array of IDs to ranges.\n    let ranges = list.reduce((out, id) => {\n      if (out.length == 0) {\n        // First element.\n        out.push({\n          low: id\n        });\n      } else {\n        let prev = out[out.length - 1];\n        if ((!prev.hi && (id != prev.low + 1)) || (id > prev.hi)) {\n          // New range.\n          out.push({\n            low: id\n          });\n        } else {\n          // Expand existing range.\n          prev.hi = prev.hi ? Math.max(prev.hi, id + 1) : id + 1;\n        }\n      }\n      return out;\n    }, []);\n    // Send {del} message, return promise\n    return this.delMessages(ranges, hardDel)\n  },\n\n  /**\n   * Delete topic. Requires Owner permission. Wrapper for {@link Tinode#delTopic}.\n   * @memberof Tinode.Topic#\n   *\n   * @param {Boolean} hard - had-delete topic.\n   * @returns {Promise} Promise to be resolved/rejected when the server responds to the request.\n   */\n  delTopic: function(hard) {\n    return this._tinode.delTopic(this.name, hard).then((ctrl) => {\n      this._resetSub();\n      this._gone();\n      return ctrl;\n    });\n  },\n\n  /**\n   * Delete subscription. Requires Share permission. Wrapper for {@link Tinode#delSubscription}.\n   * @memberof Tinode.Topic#\n   *\n   * @param {String} user - ID of the user to remove subscription for.\n   * @returns {Promise} Promise to be resolved/rejected when the server responds to request.\n   */\n  delSubscription: function(user) {\n    if (!this._subscribed) {\n      return Promise.reject(new Error(\"Cannot delete subscription in inactive topic\"));\n    }\n    // Send {del} message, return promise\n    return this._tinode.delSubscription(this.name, user).then((ctrl) => {\n      // Remove the object from the subscription cache;\n      delete this._users[user];\n      // Notify listeners\n      if (this.onSubsUpdated) {\n        this.onSubsUpdated(Object.keys(this._users));\n      }\n      return ctrl;\n    });\n  },\n\n  /**\n   * Send a read/recv notification\n   * @memberof Tinode.Topic#\n   *\n   * @param {String} what - what notification to send: <tt>recv</tt>, <tt>read</tt>.\n   * @param {Number} seq - ID or the message read or received.\n   */\n  note: function(what, seq) {\n    if (!this._subscribed) {\n      // Cannot sending {note} on an inactive topic\".\n      return;\n    }\n\n    // Update locally cached contact with the new count.\n\n    const me = this._tinode.getMeTopic();\n\n    const user = this._users[this._tinode.getCurrentUserID()];\n    let update = false;\n    if (user) {\n      // Known topic subscriber.\n      if (!user[what] || user[what] < seq) {\n        user[what] = seq;\n        update = true;\n      }\n    } else if (me) {\n      // Subscriber not found, such as in case of no S permission.\n      update = (me.getMsgReadRecv(this.name, what) < seq);\n    }\n\n    if (update) {\n      this._tinode.note(this.name, what, seq);\n    }\n\n    // Update locally cached contact with the new count.\n    if (me) {\n      me.setMsgReadRecv(this.name, what, seq);\n    }\n  },\n\n  /**\n   * Send a 'recv' receipt. Wrapper for {@link Tinode#noteRecv}.\n   * @memberof Tinode.Topic#\n   *\n   * @param {Number} seq - ID of the message to aknowledge.\n   */\n  noteRecv: function(seq) {\n    this.note('recv', seq);\n  },\n\n  /**\n   * Send a 'read' receipt. Wrapper for {@link Tinode#noteRead}.\n   * @memberof Tinode.Topic#\n   *\n   * @param {Number} seq - ID of the message to aknowledge or 0/undefined to acknowledge the latest messages.\n   */\n  noteRead: function(seq) {\n    seq = seq || this._maxSeq;\n    if (seq > 0) {\n      this.note('read', seq);\n    }\n  },\n\n  /**\n   * Send a key-press notification. Wrapper for {@link Tinode#noteKeyPress}.\n   * @memberof Tinode.Topic#\n   */\n  noteKeyPress: function() {\n    if (this._subscribed) {\n      this._tinode.noteKeyPress(this.name);\n    } else {\n      this._tinode.logger(\"INFO: Cannot send notification in inactive topic\");\n    }\n  },\n\n  /**\n   * Get user description from global cache. The user does not need to be a\n   * subscriber of this topic.\n   * @memberof Tinode.Topic#\n   *\n   * @param {String} uid - ID of the user to fetch.\n   * @return {Object} user description or undefined.\n   */\n  userDesc: function(uid) {\n    // TODO(gene): handle asynchronous requests\n\n    const user = this._cacheGetUser(uid);\n    if (user) {\n      return user; // Promise.resolve(user)\n    }\n  },\n\n  /**\n   * Get description of the p2p peer from subscription cache.\n   * @memberof Tinode.Topic#\n   *\n   * @return {Object} peer's description or undefined.\n   */\n  p2pPeerDesc: function() {\n    if (!this.isP2P()) {\n      return undefined;\n    }\n    return this._users[this.name];\n  },\n\n  /**\n   * Iterate over cached subscribers. If callback is undefined, use this.onMetaSub.\n   * @memberof Tinode.Topic#\n   *\n   * @param {Function} callback - Callback which will receive subscribers one by one.\n   * @param {Object=} context - Value of `this` inside the `callback`.\n   */\n  subscribers: function(callback, context) {\n    const cb = (callback || this.onMetaSub);\n    if (cb) {\n      for (let idx in this._users) {\n        cb.call(context, this._users[idx], idx, this._users);\n      }\n    }\n  },\n\n  /**\n   * Get a copy of cached tags.\n   * @memberof Tinode.Topic#\n   * @return a copy of tags\n   */\n  tags: function() {\n    // Return a copy.\n    return this._tags.slice(0);\n  },\n\n  /**\n   * Get cached subscription for the given user ID.\n   * @memberof Tinode.Topic#\n   *\n   * @param {String} uid - id of the user to query for\n   * @return user description or undefined.\n   */\n  subscriber: function(uid) {\n    return this._users[uid];\n  },\n\n  /**\n   * Iterate over cached messages. If callback is undefined, use this.onData.\n   * @memberof Tinode.Topic#\n   *\n   * @param {function} callback - Callback which will receive messages one by one. See {@link Tinode.CBuffer#forEach}\n   * @param {integer} sinceId - Optional seqId to start iterating from (inclusive).\n   * @param {integer} beforeId - Optional seqId to stop iterating before (exclusive).\n   * @param {Object} context - Value of `this` inside the `callback`.\n   */\n  messages: function(callback, sinceId, beforeId, context) {\n    const cb = (callback || this.onData);\n    if (cb) {\n      let startIdx = typeof sinceId == 'number' ? this._messages.find({\n        seq: sinceId\n      }, true) : undefined;\n      let beforeIdx = typeof beforeId == 'number' ? this._messages.find({\n        seq: beforeId\n      }, true) : undefined;\n      if (startIdx != -1 && beforeIdx != -1) {\n        this._messages.forEach(cb, startIdx, beforeIdx, context);\n      }\n    }\n  },\n\n  /**\n   * Iterate over cached unsent messages. Wraps {@link Tinode.Topic#messages}.\n   * @memberof Tinode.Topic#\n   *\n   * @param {function} callback - Callback which will receive messages one by one. See {@link Tinode.CBuffer#forEach}\n   * @param {Object} context - Value of `this` inside the `callback`.\n   */\n  queuedMessages: function(callback, context) {\n    if (!callback) {\n      throw new Error(\"Callback must be provided\");\n    }\n    this.messages(callback, LOCAL_SEQID, undefined, context);\n  },\n\n  /**\n   * Get the number of topic subscribers who marked this message as either recv or read\n   * Current user is excluded from the count.\n   * @memberof Tinode.Topic#\n   *\n   * @param {String} what - what notification to send: <tt>recv</tt>, <tt>read</tt>.\n   * @param {Number} seq - ID or the message read or received.\n   */\n  msgReceiptCount: function(what, seq) {\n    let count = 0;\n    if (seq > 0) {\n      const me = this._tinode.getCurrentUserID();\n      for (let idx in this._users) {\n        const user = this._users[idx];\n        if (user.user !== me && user[what] >= seq) {\n          count++;\n        }\n      }\n    }\n    return count;\n  },\n\n  /**\n   * Get the number of topic subscribers who marked this message (and all older messages) as read.\n   * The current user is excluded from the count.\n   * @memberof Tinode.Topic#\n   *\n   * @param {Number} seq - Message id to check.\n   * @returns {Number} Number of subscribers who claim to have received the message.\n   */\n  msgReadCount: function(seq) {\n    return this.msgReceiptCount('read', seq);\n  },\n\n  /**\n   * Get the number of topic subscribers who marked this message (and all older messages) as received.\n   * The current user is excluded from the count.\n   * @memberof Tinode.Topic#\n   *\n   * @param {number} seq - Message id to check.\n   * @returns {number} Number of subscribers who claim to have received the message.\n   */\n  msgRecvCount: function(seq) {\n    return this.msgReceiptCount('recv', seq);\n  },\n\n  /**\n   * Check if cached message IDs indicate that the server may have more messages.\n   * @memberof Tinode.Topic#\n   *\n   * @param {boolean} newer check for newer messages\n   */\n  msgHasMoreMessages: function(newer) {\n    return newer ? this.seq > this._maxSeq :\n      // _minSeq cound be more than 1, but earlier messages could have been deleted.\n      (this._minSeq > 1 && !this._noEarlierMsgs);\n  },\n\n  /**\n   * Check if the given seq Id is id of the most recent message.\n   * @memberof Tinode.Topic#\n   *\n   * @param {integer} seqId id of the message to check\n   */\n  isNewMessage: function(seqId) {\n    return this._maxSeq <= seqId;\n  },\n\n  /**\n   * Remove one message from local cache.\n   * @memberof Tinode.Topic#\n   *\n   * @param {integer} seqId id of the message to remove from cache.\n   * @returns {Message} removed message or undefined if such message was not found.\n   */\n  flushMessage: function(seqId) {\n    const idx = this._messages.find({\n      seq: seqId\n    });\n    return idx >= 0 ? this._messages.delAt(idx) : undefined;\n  },\n\n  /**\n   * Update message's seqId.\n   * @memberof Tinode.Topic#\n   *\n   * @param {Object} pub message object.\n   * @param {integer} newSeqId new seq id for pub.\n   */\n  swapMessageId: function(pub, newSeqId) {\n    const idx = this._messages.find({\n      seq: pub.seq\n    });\n    const numMessages = this._messages.length();\n    pub.seq = newSeqId;\n    if (0 <= idx && idx < numMessages) {\n      // this._messages are sorted by `seq`.\n      // If changing pub.seq to newSeqId breaks the invariant, fix it.\n      if ((idx > 0 && this._messages.getAt(idx - 1).seq >= newSeqId) ||\n        (idx + 1 < numMessages && newSeqId < this._messages.getAt(idx + 1).seq <= newSeqId)) {\n        this._messages.delAt(idx);\n        this._messages.put(pub);\n      }\n    }\n  },\n\n  /**\n   * Remove a range of messages from the local cache.\n   * @memberof Tinode.Topic#\n   *\n   * @param {integer} fromId seq ID of the first message to remove (inclusive).\n   * @param {integer} untilId seqID of the last message to remove (exclusive).\n   *\n   * @returns {Message[]} array of removed messages (could be empty).\n   */\n  flushMessageRange: function(fromId, untilId) {\n    // start, end: find insertion points (nearest == true).\n    const since = this._messages.find({\n      seq: fromId\n    }, true);\n    return since >= 0 ? this._messages.delRange(since, this._messages.find({\n      seq: untilId\n    }, true)) : [];\n  },\n\n  /**\n   * Attempt to stop message from being sent.\n   * @memberof Tinode.Topic#\n   *\n   * @param {integer} seqId id of the message to stop sending and remove from cache.\n   *\n   * @returns {boolean} true if message was cancelled, false otherwise.\n   */\n  cancelSend: function(seqId) {\n    const idx = this._messages.find({\n      seq: seqId\n    });\n    if (idx >= 0) {\n      const msg = this._messages.getAt(idx);\n      const status = this.msgStatus(msg);\n      if (status == MESSAGE_STATUS_QUEUED || status == MESSAGE_STATUS_FAILED) {\n        msg._cancelled = true;\n        this._messages.delAt(idx);\n        if (this.onData) {\n          // Calling with no parameters to indicate the message was deleted.\n          this.onData();\n        }\n        return true;\n      }\n    }\n    return false;\n  },\n\n  /**\n   * Get type of the topic: me, p2p, grp, fnd...\n   * @memberof Tinode.Topic#\n   *\n   * @returns {String} One of 'me', 'p2p', 'grp', 'fnd', 'sys' or <tt>undefined</tt>.\n   */\n  getType: function() {\n    return Tinode.topicType(this.name);\n  },\n\n  /**\n   * Get user's cumulative access mode of the topic.\n   * @memberof Tinode.Topic#\n   *\n   * @returns {Tinode.AccessMode} - user's access mode\n   */\n  getAccessMode: function() {\n    return this.acs;\n  },\n\n  /**\n   * Get topic's default access mode.\n   * @memberof Tinode.Topic#\n   *\n   * @returns {Tinode.DefAcs} - access mode, such as {auth: `RWP`, anon: `N`}.\n   */\n  getDefaultAccess: function() {\n    return this.defacs;\n  },\n\n  /**\n   * Initialize new meta {@link Tinode.GetQuery} builder. The query is attched to the current topic.\n   * It will not work correctly if used with a different topic.\n   * @memberof Tinode.Topic#\n   *\n   * @returns {Tinode.MetaGetBuilder} query attached to the current topic.\n   */\n  startMetaQuery: function() {\n    return new MetaGetBuilder(this);\n  },\n\n  /**\n   * Check if topic is archived, i.e. private.arch == true.\n   * @memberof Tinode.Topic#\n   *\n   * @returns {boolean} - true if topic is archived, false otherwise.\n   */\n  isArchived: function() {\n    return this.private && this.private.arch ? true : false;\n  },\n\n  /**\n   * Check if topic is a channel.\n   * @memberof Tinode.Topic#\n   *\n   * @returns {boolean} - true if topic is a channel, false otherwise.\n   */\n  isChannel: function() {\n    return Tinode.isChannelTopicName(this.name);\n  },\n\n  /**\n   * Check if topic is a group topic.\n   * @memberof Tinode.Topic#\n   *\n   * @returns {boolean} - true if topic is a group, false otherwise.\n   */\n  isGroup: function() {\n    return Tinode.isGroupTopicName(this.name);\n  },\n\n  /**\n   * Check if topic is a p2p topic.\n   * @memberof Tinode.Topic#\n   *\n   * @returns {boolean} - true if topic is a p2p topic, false otherwise.\n   */\n  isP2P: function() {\n    return Tinode.isP2PTopicName(this.name);\n  },\n\n  /**\n   * Get status (queued, sent, received etc) of a given message in the context\n   * of this topic.\n   * @memberof Tinode.Topic#\n   *\n   * @param {Message} msg message to check for status.\n   * @returns message status constant.\n   */\n  msgStatus: function(msg) {\n    let status = MESSAGE_STATUS_NONE;\n    if (this._tinode.isMe(msg.from)) {\n      if (msg._sending) {\n        status = MESSAGE_STATUS_SENDING;\n      } else if (msg._failed || msg._cancelled) {\n        status = MESSAGE_STATUS_FAILED;\n      } else if (msg.seq >= LOCAL_SEQID) {\n        status = MESSAGE_STATUS_QUEUED;\n      } else if (this.msgReadCount(msg.seq) > 0) {\n        status = MESSAGE_STATUS_READ;\n      } else if (this.msgRecvCount(msg.seq) > 0) {\n        status = MESSAGE_STATUS_RECEIVED;\n      } else if (msg.seq > 0) {\n        status = MESSAGE_STATUS_SENT;\n      }\n    } else {\n      status = MESSAGE_STATUS_TO_ME;\n    }\n    return status;\n  },\n\n  // Process data message\n  _routeData: function(data) {\n    if (data.content) {\n      if (!this.touched || this.touched < data.ts) {\n        this.touched = data.ts;\n      }\n    }\n\n    if (data.seq > this._maxSeq) {\n      this._maxSeq = data.seq;\n    }\n    if (data.seq < this._minSeq || this._minSeq == 0) {\n      this._minSeq = data.seq;\n    }\n\n    if (!data._noForwarding) {\n      this._messages.put(data);\n      this._updateDeletedRanges();\n    }\n\n    if (this.onData) {\n      this.onData(data);\n    }\n\n    // Update locally cached contact with the new message count.\n    const me = this._tinode.getMeTopic();\n    if (me) {\n      // Messages from the current user are considered to be read already.\n      me.setMsgReadRecv(this.name,\n        (!data.from || this._tinode.isMe(data.from)) ? 'read' : 'msg', data.seq, data.ts);\n    }\n  },\n\n  // Process metadata message\n  _routeMeta: function(meta) {\n    if (meta.desc) {\n      this._lastDescUpdate = meta.ts;\n      this._processMetaDesc(meta.desc);\n    }\n    if (meta.sub && meta.sub.length > 0) {\n      this._lastSubsUpdate = meta.ts;\n      this._processMetaSub(meta.sub);\n    }\n    if (meta.del) {\n      this._processDelMessages(meta.del.clear, meta.del.delseq);\n    }\n    if (meta.tags) {\n      this._processMetaTags(meta.tags);\n    }\n    if (meta.cred) {\n      this._processMetaCreds(meta.cred);\n    }\n    if (this.onMeta) {\n      this.onMeta(meta);\n    }\n  },\n\n  // Process presence change message\n  _routePres: function(pres) {\n    let user;\n    switch (pres.what) {\n      case 'del':\n        // Delete cached messages.\n        this._processDelMessages(pres.clear, pres.delseq);\n        break;\n      case 'on':\n      case 'off':\n        // Update online status of a subscription.\n        user = this._users[pres.src];\n        if (user) {\n          user.online = pres.what == 'on';\n        } else {\n          this._tinode.logger(\"WARNING: Presence update for an unknown user\", this.name, pres.src);\n        }\n        break;\n      case 'term':\n        // Attachment to topic is terminated probably due to cluster rehashing.\n        this._resetSub();\n        break;\n      case 'acs':\n        const uid = pres.src || this._tinode.getCurrentUserID();\n        user = this._users[uid];\n        if (!user) {\n          // Update for an unknown user: notification of a new subscription.\n          const acs = new AccessMode().updateAll(pres.dacs);\n          if (acs && acs.mode != AccessMode._NONE) {\n            user = this._cacheGetUser(uid);\n            if (!user) {\n              user = {\n                user: uid,\n                acs: acs\n              };\n              this.getMeta(this.startMetaQuery().withOneSub(undefined, uid).build());\n            } else {\n              user.acs = acs;\n            }\n            user.updated = new Date();\n            this._processMetaSub([user]);\n          }\n        } else {\n          // Known user\n          user.acs.updateAll(pres.dacs);\n          // Update user's access mode.\n          this._processMetaSub([{\n            user: uid,\n            updated: new Date(),\n            acs: user.acs\n          }]);\n        }\n        break;\n      default:\n        this._tinode.logger(\"INFO: Ignored presence update\", pres.what);\n    }\n\n    if (this.onPres) {\n      this.onPres(pres);\n    }\n  },\n\n  // Process {info} message\n  _routeInfo: function(info) {\n    if (info.what !== 'kp') {\n      const user = this._users[info.from];\n      if (user) {\n        user[info.what] = info.seq;\n        if (user.recv < user.read) {\n          user.recv = user.read;\n        }\n      }\n\n      // If this is an update from the current user, update the contact with the new count too.\n      if (this._tinode.isMe(info.from)) {\n        const me = this._tinode.getMeTopic();\n        if (me) {\n          me.setMsgReadRecv(info.topic, info.what, info.seq);\n        }\n      }\n    }\n    if (this.onInfo) {\n      this.onInfo(info);\n    }\n  },\n\n  // Called by Tinode when meta.desc packet is received.\n  // Called by 'me' topic on contact update (desc._noForwarding is true).\n  _processMetaDesc: function(desc) {\n    // Synthetic desc may include defacs for p2p topics which is useless.\n    // Remove it.\n    if (this.isP2P()) {\n      delete desc.defacs;\n    }\n\n    // Copy parameters from desc object to this topic.\n    mergeObj(this, desc);\n    // Make sure date fields are Date().\n    stringToDate(this);\n\n    // Update relevant contact in the me topic, if available:\n    if (this.name !== TOPIC_ME && !desc._noForwarding) {\n      const me = this._tinode.getMeTopic();\n      if (me) {\n        // Must use original 'desc' instead of 'this' so not to lose DEL_CHAR.\n        me._processMetaSub([{\n          _noForwarding: true,\n          topic: this.name,\n          updated: this.updated,\n          touched: this.touched,\n          acs: desc.acs,\n          seq: desc.seq,\n          read: desc.read,\n          recv: desc.recv,\n          public: desc.public,\n          private: desc.private\n        }]);\n      }\n    }\n\n    if (this.onMetaDesc) {\n      this.onMetaDesc(this);\n    }\n  },\n\n  // Called by Tinode when meta.sub is recived or in response to received\n  // {ctrl} after setMeta-sub.\n  _processMetaSub: function(subs) {\n    for (let idx in subs) {\n      const sub = subs[idx];\n\n      sub.updated = new Date(sub.updated);\n      sub.deleted = sub.deleted ? new Date(sub.deleted) : null;\n\n      let user = null;\n      if (!sub.deleted) {\n        // If this is a change to user's own permissions, update them in topic too.\n        // Desc will update 'me' topic.\n        if (this._tinode.isMe(sub.user) && sub.acs) {\n          this._processMetaDesc({\n            updated: sub.updated || new Date(),\n            touched: sub.updated,\n            acs: sub.acs\n          });\n        }\n        user = this._updateCachedUser(sub.user, sub);\n      } else {\n        // Subscription is deleted, remove it from topic (but leave in Users cache)\n        delete this._users[sub.user];\n        user = sub;\n      }\n\n      if (this.onMetaSub) {\n        this.onMetaSub(user);\n      }\n    }\n\n    if (this.onSubsUpdated) {\n      this.onSubsUpdated(Object.keys(this._users));\n    }\n  },\n\n  // Called by Tinode when meta.tags is recived.\n  _processMetaTags: function(tags) {\n    if (tags.length == 1 && tags[0] == Tinode.DEL_CHAR) {\n      tags = [];\n    }\n    this._tags = tags;\n    if (this.onTagsUpdated) {\n      this.onTagsUpdated(tags);\n    }\n  },\n\n  // Do nothing for topics other than 'me'\n  _processMetaCreds: function(creds) {},\n\n  // Delete cached messages and update cached transaction IDs\n  _processDelMessages: function(clear, delseq) {\n    this._maxDel = Math.max(clear, this._maxDel);\n    this.clear = Math.max(clear, this.clear);\n    const topic = this;\n    let count = 0;\n    if (Array.isArray(delseq)) {\n      delseq.map(function(range) {\n        if (!range.hi) {\n          count++;\n          topic.flushMessage(range.low);\n        } else {\n          for (let i = range.low; i < range.hi; i++) {\n            count++;\n            topic.flushMessage(i);\n          }\n        }\n      });\n    }\n\n    if (count > 0) {\n      this._updateDeletedRanges();\n\n      if (this.onData) {\n        this.onData();\n      }\n    }\n  },\n\n  // Topic is informed that the entire response to {get what=data} has been received.\n  _allMessagesReceived: function(count) {\n    this._updateDeletedRanges();\n\n    if (this.onAllMessagesReceived) {\n      this.onAllMessagesReceived(count);\n    }\n  },\n\n  // Reset subscribed state\n  _resetSub: function() {\n    this._subscribed = false;\n  },\n\n  // This topic is either deleted or unsubscribed from.\n  _gone: function() {\n    this._messages.reset();\n    this._users = {};\n    this.acs = new AccessMode(null);\n    this.private = null;\n    this.public = null;\n    this._maxSeq = 0;\n    this._minSeq = 0;\n    this._subscribed = false;\n\n    const me = this._tinode.getMeTopic();\n    if (me) {\n      me._routePres({\n        _noForwarding: true,\n        what: 'gone',\n        topic: TOPIC_ME,\n        src: this.name\n      });\n    }\n    if (this.onDeleteTopic) {\n      this.onDeleteTopic();\n    }\n  },\n\n  // Update global user cache and local subscribers cache.\n  // Don't call this method for non-subscribers.\n  _updateCachedUser: function(uid, obj) {\n    // Fetch user object from the global cache.\n    // This is a clone of the stored object\n    let cached = this._cacheGetUser(uid);\n    cached = mergeObj(cached || {}, obj);\n    // Save to global cache\n    this._cachePutUser(uid, cached);\n    // Save to the list of topic subsribers.\n    return mergeToCache(this._users, uid, cached);\n  },\n\n  // Get local seqId for a queued message.\n  _getQueuedSeqId: function() {\n    return this._queuedSeqId++;\n  },\n\n  // Calculate ranges of missing messages.\n  _updateDeletedRanges: function() {\n    const ranges = [];\n\n    let prev = null;\n    // Check for gap in the beginning, before the first message.\n    const first = this._messages.getAt(0);\n    if (first && this._minSeq > 1 && !this._noEarlierMsgs) {\n      // Some messages are missing in the beginning.\n      if (first.hi) {\n        // The first message already represents a gap.\n        if (first.seq > 1) {\n          first.seq = 1;\n        }\n        if (first.hi < this._minSeq - 1) {\n          first.hi = this._minSeq - 1;\n        }\n        prev = first;\n      } else {\n        // Create new gap.\n        prev = {\n          seq: 1,\n          hi: this._minSeq - 1\n        };\n        ranges.push(prev);\n      }\n    } else {\n      // No gap in the beginning.\n      prev = {\n        seq: 0,\n        hi: 0\n      };\n    }\n\n    // Find gaps in the list of received messages. The list contains messages-proper as well\n    // as placeholers for deleted ranges.\n    // The messages are iterated by seq ID in ascending order.\n    this._messages.forEach((data) => {\n      // Do not create a gap between the last sent message and the first unsent.\n      if (data.seq >= LOCAL_SEQID) {\n        return;\n      }\n\n      // New message is reducing the existing gap\n      if (data.seq == (prev.hi || prev.seq) + 1) {\n        // No new gap. Replace previous with current.\n        prev = data;\n        return;\n      }\n\n      // Found a new gap.\n      if (prev.hi) {\n        // Previous is also a gap, alter it.\n        prev.hi = data.hi || data.seq;\n        return;\n      }\n\n      // Previous is not a gap. Create a new gap.\n      prev = {\n        seq: (prev.hi || prev.seq) + 1,\n        hi: data.hi || data.seq\n      };\n      ranges.push(prev);\n    });\n\n    // Check for missing messages at the end.\n    // All messages could be missing or it could be a new topic with no messages.\n    const last = this._messages.getLast();\n    const maxSeq = Math.max(this.seq, this._maxSeq) || 0;\n    if ((maxSeq > 0 && !last) || (last && ((last.hi || last.seq) < maxSeq))) {\n      if (last && last.hi) {\n        // Extend existing gap\n        last.hi = maxSeq;\n      } else {\n        // Create new gap.\n        ranges.push({\n          seq: last ? last.seq + 1 : 1,\n          hi: maxSeq\n        });\n      }\n    }\n\n    // Insert new gaps into cache.\n    ranges.map((gap) => {\n      this._messages.put(gap);\n    });\n  }\n};\n\n/**\n * @class TopicMe - special case of {@link Tinode.Topic} for\n * managing data of the current user, including contact list.\n * @extends Tinode.Topic\n * @memberof Tinode\n *\n * @param {TopicMe.Callbacks} callbacks - Callbacks to receive various events.\n */\nvar TopicMe = function(callbacks) {\n  Topic.call(this, TOPIC_ME, callbacks);\n  // List of contacts (topic_name -> Contact object)\n  this._contacts = {};\n\n  // me-specific callbacks\n  if (callbacks) {\n    this.onContactUpdate = callbacks.onContactUpdate;\n  }\n};\n\n// Inherit everyting from the generic Topic\nTopicMe.prototype = Object.create(Topic.prototype, {\n  // Override the original Topic._processMetaDesc.\n  _processMetaDesc: {\n    value: function(desc) {\n      // Check if online contacts need to be turned off because P permission was removed.\n      const turnOff = (desc.acs && !desc.acs.isPresencer()) && (this.acs && this.acs.isPresencer());\n\n      // Copy parameters from desc object to this topic.\n      mergeObj(this, desc);\n      // String datetime headers to Date() objects.\n      stringToDate(this);\n\n      // 'P' permission was removed. All topics are offline now.\n      if (turnOff) {\n        Object.values(this._contacts).map((cont) => {\n          if (cont.online) {\n            cont.online = false;\n            if (cont.seen) {\n              cont.seen.when = new Date();\n            } else {\n              cont.seen = {\n                when: new Date()\n              };\n            }\n            if (this.onContactUpdate) {\n              this.onContactUpdate('off', cont);\n            }\n          }\n        });\n      }\n\n      if (this.onMetaDesc) {\n        this.onMetaDesc(this);\n      }\n    },\n    enumerable: true,\n    configurable: true,\n    writable: false\n  },\n\n  // Override the original Topic._processMetaSub\n  _processMetaSub: {\n    value: function(subs) {\n      let updateCount = 0;\n      for (let idx in subs) {\n        const sub = subs[idx];\n        const topicName = sub.topic;\n\n        // Don't show 'me' and 'fnd' topics in the list of contacts.\n        if (topicName == TOPIC_FND || topicName == TOPIC_ME) {\n          continue;\n        }\n        sub.updated = new Date(sub.updated);\n        sub.touched = sub.touched ? new Date(sub.touched) : undefined;\n        sub.deleted = sub.deleted ? new Date(sub.deleted) : null;\n\n        let cont = null;\n        if (sub.deleted) {\n          cont = sub;\n          delete this._contacts[topicName];\n        } else {\n          // Ensure the values are defined and are integers.\n          if (typeof sub.seq != 'undefined') {\n            sub.seq = sub.seq | 0;\n            sub.recv = sub.recv | 0;\n            sub.read = sub.read | 0;\n            sub.unread = sub.seq - sub.read;\n          }\n\n          if (sub.seen && sub.seen.when) {\n            sub.seen.when = new Date(sub.seen.when);\n          }\n          cont = mergeToCache(this._contacts, topicName, sub);\n\n          if (Tinode.isP2PTopicName(topicName)) {\n            this._cachePutUser(topicName, cont);\n          }\n          // Notify topic of the update if it's an external update.\n          if (!sub._noForwarding) {\n            const topic = this._tinode.getTopic(topicName);\n            if (topic) {\n              sub._noForwarding = true;\n              topic._processMetaDesc(sub);\n            }\n          }\n        }\n\n        updateCount++;\n\n        if (this.onMetaSub) {\n          this.onMetaSub(cont);\n        }\n      }\n\n      if (this.onSubsUpdated) {\n        this.onSubsUpdated(Object.keys(this._contacts), updateCount);\n      }\n    },\n    enumerable: true,\n    configurable: true,\n    writable: false\n  },\n\n  // Called by Tinode when meta.sub is recived.\n  _processMetaCreds: {\n    value: function(creds, upd) {\n      if (creds.length == 1 && creds[0] == Tinode.DEL_CHAR) {\n        creds = [];\n      }\n      if (upd) {\n        creds.map((cr) => {\n          if (cr.val) {\n            // Adding a credential.\n            let idx = this._credentials.findIndex((el) => {\n              return el.meth == cr.meth && el.val == cr.val;\n            });\n            if (idx < 0) {\n              // Not found.\n              if (!cr.done) {\n                // Unconfirmed credential replaces previous unconfirmed credential of the same method.\n                idx = this._credentials.findIndex((el) => {\n                  return el.meth == cr.meth && !el.done;\n                });\n                if (idx >= 0) {\n                  // Remove previous unconfirmed credential.\n                  this._credentials.splice(idx, 1);\n                }\n              }\n              this._credentials.push(cr);\n            } else {\n              // Found. Maybe change 'done' status.\n              this._credentials[idx].done = cr.done;\n            }\n          } else if (cr.resp) {\n            // Handle credential confirmation.\n            const idx = this._credentials.findIndex((el) => {\n              return el.meth == cr.meth && !el.done;\n            });\n            if (idx >= 0) {\n              this._credentials[idx].done = true;\n            }\n          }\n        });\n      } else {\n        this._credentials = creds;\n      }\n      if (this.onCredsUpdated) {\n        this.onCredsUpdated(this._credentials);\n      }\n    },\n    enumerable: true,\n    configurable: true,\n    writable: false\n  },\n\n  // Process presence change message\n  _routePres: {\n    value: function(pres) {\n      if (pres.what == 'term') {\n        // The 'me' topic itself is detached. Mark as unsubscribed.\n        this._resetSub();\n        return;\n      }\n\n      if (pres.what == 'upd' && pres.src == TOPIC_ME) {\n        // Update to me's description. Request updated value.\n        this.getMeta(this.startMetaQuery().withDesc().build());\n        return;\n      }\n\n      const cont = this._contacts[pres.src];\n      if (cont) {\n        switch (pres.what) {\n          case 'on': // topic came online\n            cont.online = true;\n            break;\n          case 'off': // topic went offline\n            if (cont.online) {\n              cont.online = false;\n              if (cont.seen) {\n                cont.seen.when = new Date();\n              } else {\n                cont.seen = {\n                  when: new Date()\n                };\n              }\n            }\n            break;\n          case 'msg': // new message received\n            cont.touched = new Date();\n            cont.seq = pres.seq | 0;\n            // Check if message is sent by the current user. If so it's been read already.\n            if (!pres.act || this._tinode.isMe(pres.act)) {\n              cont.read = cont.read ? Math.max(cont.read, cont.seq) : cont.seq;\n              cont.recv = cont.recv ? Math.max(cont.read, cont.recv) : cont.read;\n            }\n            cont.unread = cont.seq - (cont.read | 0);\n            break;\n          case 'upd': // desc updated\n            // Request updated subscription.\n            this.getMeta(this.startMetaQuery().withLaterOneSub(pres.src).build());\n            break;\n          case 'acs': // access mode changed\n            if (cont.acs) {\n              cont.acs.updateAll(pres.dacs);\n            } else {\n              cont.acs = new AccessMode().updateAll(pres.dacs);\n            }\n            cont.touched = new Date();\n            break;\n          case 'ua': // user agent changed\n            cont.seen = {\n              when: new Date(),\n              ua: pres.ua\n            };\n            break;\n          case 'recv': // user's other session marked some messges as received\n            pres.seq = pres.seq | 0;\n            cont.recv = cont.recv ? Math.max(cont.recv, pres.seq) : pres.seq;\n            break;\n          case 'read': // user's other session marked some messages as read\n            pres.seq = pres.seq | 0;\n            cont.read = cont.read ? Math.max(cont.read, pres.seq) : pres.seq;\n            cont.recv = cont.recv ? Math.max(cont.read, cont.recv) : cont.recv;\n            cont.unread = cont.seq - cont.read;\n            break;\n          case 'gone': // topic deleted or unsubscribed from\n            delete this._contacts[pres.src];\n            break;\n          case 'del':\n            // Update topic.del value.\n            break;\n          default:\n            this._tinode.logger(\"INFO: Unsupported presence update in 'me'\", pres.what);\n        }\n\n        if (this.onContactUpdate) {\n          this.onContactUpdate(pres.what, cont);\n        }\n      } else {\n        if (pres.what == 'acs') {\n          // New subscriptions and deleted/banned subscriptions have full\n          // access mode (no + or - in the dacs string). Changes to known subscriptions are sent as\n          // deltas, but they should not happen here.\n          const acs = new AccessMode(pres.dacs);\n          if (!acs || acs.mode == AccessMode._INVALID) {\n            this._tinode.logger(\"ERROR: Invalid access mode update\", pres.src, pres.dacs);\n            return;\n          } else if (acs.mode == AccessMode._NONE) {\n            this._tinode.logger(\"WARNING: Removing non-existent subscription\", pres.src, pres.dacs);\n            return;\n          } else {\n            // New subscription. Send request for the full description.\n            // Using .withOneSub (not .withLaterOneSub) to make sure IfModifiedSince is not set.\n            this.getMeta(this.startMetaQuery().withOneSub(undefined, pres.src).build());\n            // Create a dummy entry to catch online status update.\n            this._contacts[pres.src] = {\n              touched: new Date(),\n              topic: pres.src,\n              online: false,\n              acs: acs\n            };\n          }\n        } else if (pres.what == 'tags') {\n          this.getMeta(this.startMetaQuery().withTags().build());\n        }\n      }\n\n      if (this.onPres) {\n        this.onPres(pres);\n      }\n    },\n    enumerable: true,\n    configurable: true,\n    writable: false\n  },\n\n  /**\n   * Publishing to TopicMe is not supported. {@link Topic#publish} is overriden and thows an {Error} if called.\n   * @memberof Tinode.TopicMe#\n   * @throws {Error} Always throws an error.\n   */\n  publish: {\n    value: function() {\n      return Promise.reject(new Error(\"Publishing to 'me' is not supported\"));\n    },\n    enumerable: true,\n    configurable: true,\n    writable: false\n  },\n\n  /**\n   * Delete validation credential.\n   * @memberof Tinode.TopicMe#\n   *\n   * @param {String} topic - Name of the topic to delete\n   * @param {String} user - User ID to remove.\n   * @returns {Promise} Promise which will be resolved/rejected on receiving server reply.\n   */\n  delCredential: {\n    value: function(method, value) {\n      if (!this._subscribed) {\n        return Promise.reject(new Error(\"Cannot delete credential in inactive 'me' topic\"));\n      }\n      // Send {del} message, return promise\n      return this._tinode.delCredential(method, value).then((ctrl) => {\n        // Remove deleted credential from the cache.\n        const index = this._credentials.findIndex((el) => {\n          return el.meth == method && el.val == value;\n        });\n        if (index > -1) {\n          this._credentials.splice(index, 1);\n        }\n        // Notify listeners\n        if (this.onCredsUpdated) {\n          this.onCredsUpdated(this._credentials);\n        }\n        return ctrl;\n      });\n\n    },\n    enumerable: true,\n    configurable: true,\n    writable: false\n  },\n\n  /**\n   * Iterate over cached contacts.\n   *\n   * @function\n   * @memberof Tinode.TopicMe#\n   * @param {TopicMe.ContactCallback} callback - Callback to call for each contact.\n   * @param {function=} filter - Optionally filter contacts; include all if filter is false-ish, otherwise include those for\n   *                            which filter returns true-ish.\n   * @param {Object=} context - Context to use for calling the `callback`, i.e. the value of `this` inside the callback.\n   */\n  contacts: {\n    value: function(callback, filter, context) {\n      for (let idx in this._contacts) {\n        const c = this._contacts[idx];\n        if (!filter || filter(c)) {\n          callback.call(context, c, idx, this._contacts);\n        }\n      }\n    },\n    enumerable: true,\n    configurable: true,\n    writable: true\n  },\n\n  /**\n   * Update a cached contact with new read/received/message count.\n   * @function\n   * @memberof Tinode.TopicMe#\n   *\n   * @param {String} contactName - UID of contact to update.\n   * @param {String} what - Which count to update, one of <tt>\"read\", \"recv\", \"msg\"</tt>\n   * @param {Number} seq - New value of the count.\n   * @param {Date} ts - Timestamp of the update.\n   */\n  setMsgReadRecv: {\n    value: function(contactName, what, seq, ts) {\n      const cont = this._contacts[contactName];\n      let oldVal, doUpdate = false;\n      let mode = null;\n      if (cont) {\n        seq = seq | 0;\n        cont.seq = cont.seq | 0;\n        cont.read = cont.read | 0;\n        cont.recv = cont.recv | 0;\n        switch (what) {\n          case 'recv':\n            oldVal = cont.recv;\n            cont.recv = Math.max(cont.recv, seq);\n            doUpdate = (oldVal != cont.recv);\n            break;\n          case 'read':\n            oldVal = cont.read;\n            cont.read = Math.max(cont.read, seq);\n            doUpdate = (oldVal != cont.read);\n            break;\n          case 'msg':\n            oldVal = cont.seq;\n            cont.seq = Math.max(cont.seq, seq);\n            if (!cont.touched || cont.touched < ts) {\n              cont.touched = ts;\n            }\n            doUpdate = (oldVal != cont.seq);\n            break;\n        }\n\n        // Sanity checks.\n        if (cont.recv < cont.read) {\n          cont.recv = cont.read;\n          doUpdate = true;\n        }\n        if (cont.seq < cont.recv) {\n          cont.seq = cont.recv;\n          if (!cont.touched || cont.touched < ts) {\n            cont.touched = ts;\n          }\n          doUpdate = true;\n        }\n        cont.unread = cont.seq - cont.read;\n\n        if (doUpdate && (!cont.acs || !cont.acs.isMuted()) && this.onContactUpdate) {\n          this.onContactUpdate(what, cont);\n        }\n      }\n    },\n    enumerable: true,\n    configurable: true,\n    writable: true\n  },\n\n  /**\n   * Get cached read/received/message count for the given contact.\n   * @function\n   * @memberof Tinode.TopicMe#\n   *\n   * @param {String} contactName - UID of contact to read.\n   * @param {String} what - Which count to read, one of <tt>\"read\", \"recv\", \"msg\"</tt>\n   */\n  getMsgReadRecv: {\n    value: function(contactName, what) {\n      const cont = this._contacts[contactName];\n      if (cont) {\n        switch (what) {\n          case 'recv':\n            return cont.recv | 0;\n          case 'read':\n            return cont.read | 0;\n          case 'msg':\n            return cont.seq | 0;\n        }\n      }\n      return 0;\n    },\n    enumerable: true,\n    configurable: true,\n    writable: true\n  },\n\n  /**\n   * Get a contact from cache.\n   * @memberof Tinode.TopicMe#\n   *\n   * @param {string} name - Name of the contact to get, either a UID (for p2p topics) or a topic name.\n   * @returns {Tinode.Contact} - Contact or `undefined`.\n   */\n  getContact: {\n    value: function(name) {\n      return this._contacts[name];\n    },\n    enumerable: true,\n    configurable: true,\n    writable: true\n  },\n\n  /**\n   * Get access mode of a given contact from cache.\n   * @memberof Tinode.TopicMe#\n   *\n   * @param {String} name - Name of the contact to get access mode for, either a UID (for p2p topics)\n   *        or a topic name; if missing, access mode for the 'me' topic itself.\n   * @returns {string} - access mode, such as `RWP`.\n   */\n  getAccessMode: {\n    value: function(name) {\n      if (name) {\n        const cont = this._contacts[name];\n        return cont ? cont.acs : null;\n      }\n      return this.acs;\n    },\n    enumerable: true,\n    configurable: true,\n    writable: true\n  },\n\n  /**\n   * Check if contact is archived, i.e. contact.private.arch == true.\n   * @memberof Tinode.TopicMe#\n   *\n   * @param {String} name - Name of the contact to check archived status, either a UID (for p2p topics) or a topic name.\n   * @returns {boolean} - true if contact is archived, false otherwise.\n   */\n  isArchived: {\n    value: function(name) {\n      const cont = this._contacts[name];\n      return cont ? ((cont.private && cont.private.arch) ? true : false) : null;\n    },\n    enumerable: true,\n    configurable: true,\n    writable: true\n  },\n\n  /**\n   * @typedef Tinode.Credential\n   * @memberof Tinode\n   * @type Object\n   * @property {string} meth - validation method such as 'email' or 'tel'.\n   * @property {string} val - credential value, i.e. 'jdoe@example.com' or '+17025551234'\n   * @property {boolean} done - true if credential is validated.\n   */\n  /**\n   * Get the user's credentials: email, phone, etc.\n   * @memberof Tinode.TopicMe#\n   *\n   * @returns {Tinode.Credential[]} - array of credentials.\n   */\n  getCredentials: {\n    value: function() {\n      return this._credentials;\n    },\n    enumerable: true,\n    configurable: true,\n    writable: true\n  }\n});\nTopicMe.prototype.constructor = TopicMe;\n\n/**\n * @class TopicFnd - special case of {@link Tinode.Topic} for searching for\n * contacts and group topics.\n * @extends Tinode.Topic\n * @memberof Tinode\n *\n * @param {TopicFnd.Callbacks} callbacks - Callbacks to receive various events.\n */\nvar TopicFnd = function(callbacks) {\n  Topic.call(this, TOPIC_FND, callbacks);\n  // List of users and topics uid or topic_name -> Contact object)\n  this._contacts = {};\n};\n\n// Inherit everyting from the generic Topic\nTopicFnd.prototype = Object.create(Topic.prototype, {\n  // Override the original Topic._processMetaSub\n  _processMetaSub: {\n    value: function(subs) {\n      let updateCount = Object.getOwnPropertyNames(this._contacts).length;\n      // Reset contact list.\n      this._contacts = {};\n      for (let idx in subs) {\n        let sub = subs[idx];\n        const indexBy = sub.topic ? sub.topic : sub.user;\n\n        sub.updated = new Date(sub.updated);\n        if (sub.seen && sub.seen.when) {\n          sub.seen.when = new Date(sub.seen.when);\n        }\n\n        sub = mergeToCache(this._contacts, indexBy, sub);\n        updateCount++;\n\n        if (this.onMetaSub) {\n          this.onMetaSub(sub);\n        }\n      }\n\n      if (updateCount > 0 && this.onSubsUpdated) {\n        this.onSubsUpdated(Object.keys(this._contacts));\n      }\n    },\n    enumerable: true,\n    configurable: true,\n    writable: false\n  },\n\n  /**\n   * Publishing to TopicFnd is not supported. {@link Topic#publish} is overriden and thows an {Error} if called.\n   * @memberof Tinode.TopicFnd#\n   * @throws {Error} Always throws an error.\n   */\n  publish: {\n    value: function() {\n      return Promise.reject(new Error(\"Publishing to 'fnd' is not supported\"));\n    },\n    enumerable: true,\n    configurable: true,\n    writable: false\n  },\n\n  /**\n   * setMeta to TopicFnd resets contact list in addition to sending the message.\n   * @memberof Tinode.TopicFnd#\n   * @param {Tinode.SetParams} params parameters to update.\n   * @returns {Promise} Promise to be resolved/rejected when the server responds to request.\n   */\n  setMeta: {\n    value: function(params) {\n      const instance = this;\n      return Object.getPrototypeOf(TopicFnd.prototype).setMeta.call(this, params).then(function() {\n        if (Object.keys(instance._contacts).length > 0) {\n          instance._contacts = {};\n          if (instance.onSubsUpdated) {\n            instance.onSubsUpdated([]);\n          }\n        }\n      });\n    },\n    enumerable: true,\n    configurable: true,\n    writable: false\n  },\n\n  /**\n   * Iterate over found contacts. If callback is undefined, use {@link this.onMetaSub}.\n   * @function\n   * @memberof Tinode.TopicFnd#\n   * @param {TopicFnd.ContactCallback} callback - Callback to call for each contact.\n   * @param {Object} context - Context to use for calling the `callback`, i.e. the value of `this` inside the callback.\n   */\n  contacts: {\n    value: function(callback, context) {\n      const cb = (callback || this.onMetaSub);\n      if (cb) {\n        for (let idx in this._contacts) {\n          cb.call(context, this._contacts[idx], idx, this._contacts);\n        }\n      }\n    },\n    enumerable: true,\n    configurable: true,\n    writable: true\n  }\n});\nTopicFnd.prototype.constructor = TopicFnd;\n\n/**\n * @class LargeFileHelper - collection of utilities for uploading and downloading files\n * out of band. Don't instantiate this class directly. Use {Tinode.getLargeFileHelper} instead.\n * @memberof Tinode\n *\n * @param {Tinode} tinode - the main Tinode object.\n */\nvar LargeFileHelper = function(tinode) {\n  this._tinode = tinode;\n\n  this._apiKey = tinode._apiKey;\n  this._authToken = tinode.getAuthToken();\n  this._msgId = tinode.getNextUniqueId();\n  this.xhr = new XMLHttpRequest();\n\n  // Promise\n  this.toResolve = null;\n  this.toReject = null;\n\n  // Callbacks\n  this.onProgress = null;\n  this.onSuccess = null;\n  this.onFailure = null;\n}\n\nLargeFileHelper.prototype = {\n  /**\n   * Start uploading the file to a non-default endpoint.\n   *\n   * @memberof Tinode.LargeFileHelper#\n   *\n   * @param {String} baseUrl alternative base URL of upload server.\n   * @param {File|Blob} data to upload\n   * @param {Callback} onProgress callback. Takes one {float} parameter 0..1\n   * @param {Callback} onSuccess callback. Called when the file is successfully uploaded.\n   * @param {Callback} onFailure callback. Called in case of a failure.\n   *\n   * @returns {Promise} resolved/rejected when the upload is completed/failed.\n   */\n  uploadWithBaseUrl: function(baseUrl, data, onProgress, onSuccess, onFailure) {\n    if (!this._authToken) {\n      throw new Error(\"Must authenticate first\");\n    }\n    const instance = this;\n\n    let url = '/v' + PROTOCOL_VERSION + '/file/u/';\n    if (baseUrl) {\n      if (baseUrl.indexOf('http://') == 0 || baseUrl.indexOf('https://') == 0) {\n        url = baseUrl + url;\n      } else {\n        throw new Error(\"Invalid base URL '\" + baseUrl + \"'\");\n      }\n    }\n    this.xhr.open('POST', url, true);\n    this.xhr.setRequestHeader('X-Tinode-APIKey', this._apiKey);\n    this.xhr.setRequestHeader('X-Tinode-Auth', 'Token ' + this._authToken.token);\n    const result = new Promise((resolve, reject) => {\n      this.toResolve = resolve;\n      this.toReject = reject;\n    });\n\n    this.onProgress = onProgress;\n    this.onSuccess = onSuccess;\n    this.onFailure = onFailure;\n\n    this.xhr.upload.onprogress = (e) => {\n      if (e.lengthComputable && instance.onProgress) {\n        instance.onProgress(e.loaded / e.total);\n      }\n    }\n\n    this.xhr.onload = function() {\n      let pkt;\n      try {\n        pkt = JSON.parse(this.response, jsonParseHelper);\n      } catch (err) {\n        instance._tinode.logger(\"ERROR: Invalid server response in LargeFileHelper\", this.response);\n        pkt = {\n          ctrl: {\n            code: this.status,\n            text: this.statusText\n          }\n        };\n      }\n\n      if (this.status >= 200 && this.status < 300) {\n        if (instance.toResolve) {\n          instance.toResolve(pkt.ctrl.params.url);\n        }\n        if (instance.onSuccess) {\n          instance.onSuccess(pkt.ctrl);\n        }\n      } else if (this.status >= 400) {\n        if (instance.toReject) {\n          instance.toReject(new Error(pkt.ctrl.text + \" (\" + pkt.ctrl.code + \")\"));\n        }\n        if (instance.onFailure) {\n          instance.onFailure(pkt.ctrl)\n        }\n      } else {\n        instance._tinode.logger(\"ERROR: Unexpected server response status\", this.status, this.response);\n      }\n    };\n\n    this.xhr.onerror = function(e) {\n      if (instance.toReject) {\n        instance.toReject(new Error(\"failed\"));\n      }\n      if (instance.onFailure) {\n        instance.onFailure(null);\n      }\n    };\n\n    this.xhr.onabort = function(e) {\n      if (instance.toReject) {\n        instance.toReject(new Error(\"upload cancelled by user\"));\n      }\n      if (instance.onFailure) {\n        instance.onFailure(null);\n      }\n    };\n\n    try {\n      const form = new FormData();\n      form.append('file', data);\n      form.set('id', this._msgId);\n      this.xhr.send(form);\n    } catch (err) {\n      if (this.toReject) {\n        this.toReject(err);\n      }\n      if (this.onFailure) {\n        this.onFailure(null);\n      }\n    }\n\n    return result;\n  },\n\n  /**\n   * Start uploading the file to default endpoint.\n   *\n   * @memberof Tinode.LargeFileHelper#\n   *\n   * @param {File|Blob} data to upload\n   * @param {Callback} onProgress callback. Takes one {float} parameter 0..1\n   * @param {Callback} onSuccess callback. Called when the file is successfully uploaded.\n   * @param {Callback} onFailure callback. Called in case of a failure.\n   *\n   * @returns {Promise} resolved/rejected when the upload is completed/failed.\n   */\n  upload: function(data, onProgress, onSuccess, onFailure) {\n    return this.uploadWithBaseUrl(undefined, data, onProgress, onSuccess, onFailure);\n  },\n\n  /**\n   * Download the file from a given URL using GET request. This method works with the Tinode server only.\n   *\n   * @memberof Tinode.LargeFileHelper#\n   *\n   * @param {String} relativeUrl - URL to download the file from. Must be relative url, i.e. must not contain the host.\n   * @param {String=} filename - file name to use for the downloaded file.\n   *\n   * @returns {Promise} resolved/rejected when the download is completed/failed.\n   */\n  download: function(relativeUrl, filename, mimetype, onProgress, onError) {\n    if (!Tinode.isRelativeURL(relativeUrl)) {\n      // As a security measure refuse to download from an absolute URL.\n      if (onError) {\n        onError(\"The URL '\" + relativeUrl + \"' must be relative, not absolute\");\n      }\n      return;\n    }\n    if (!this._authToken) {\n      if (onError) {\n        onError(\"Must authenticate first\");\n      }\n      return;\n    }\n    const instance = this;\n    // Get data as blob (stored by the browser as a temporary file).\n    this.xhr.open('GET', relativeUrl, true);\n    this.xhr.setRequestHeader('X-Tinode-APIKey', this._apiKey);\n    this.xhr.setRequestHeader('X-Tinode-Auth', 'Token ' + this._authToken.token);\n    this.xhr.responseType = 'blob';\n\n    this.onProgress = onProgress;\n    this.xhr.onprogress = function(e) {\n      if (instance.onProgress) {\n        // Passing e.loaded instead of e.loaded/e.total because e.total\n        // is always 0 with gzip compression enabled by the server.\n        instance.onProgress(e.loaded);\n      }\n    };\n\n    const result = new Promise((resolve, reject) => {\n      this.toResolve = resolve;\n      this.toReject = reject;\n    });\n\n    // The blob needs to be saved as file. There is no known way to\n    // save the blob as file other than to fake a click on an <a href... download=...>.\n    this.xhr.onload = function() {\n      if (this.status == 200) {\n        const link = document.createElement('a');\n        // URL.createObjectURL is not available in non-browser environment. This call will fail.\n        link.href = window.URL.createObjectURL(new Blob([this.response], {\n          type: mimetype\n        }));\n        link.style.display = 'none';\n        link.setAttribute('download', filename);\n        document.body.appendChild(link);\n        link.click();\n        document.body.removeChild(link);\n        window.URL.revokeObjectURL(link.href);\n        if (instance.toResolve) {\n          instance.toResolve();\n        }\n      } else if (this.status >= 400 && instance.toReject) {\n        // The this.responseText is undefined, must use this.response which is a blob.\n        // Need to convert this.response to JSON. The blob can only be accessed by the\n        // FileReader.\n        const reader = new FileReader();\n        reader.onload = function() {\n          try {\n            const pkt = JSON.parse(this.result, jsonParseHelper);\n            instance.toReject(new Error(pkt.ctrl.text + \" (\" + pkt.ctrl.code + \")\"));\n          } catch (err) {\n            instance._tinode.logger(\"ERROR: Invalid server response in LargeFileHelper\", this.result);\n            instance.toReject(err);\n          }\n        };\n        reader.readAsText(this.response);\n      }\n    };\n\n    this.xhr.onerror = function(e) {\n      if (instance.toReject) {\n        instance.toReject(new Error(\"failed\"));\n      }\n    };\n\n    this.xhr.onabort = function() {\n      if (instance.toReject) {\n        instance.toReject(null);\n      }\n    };\n\n    try {\n      this.xhr.send();\n    } catch (err) {\n      if (this.toReject) {\n        this.toReject(err);\n      }\n    }\n\n    return result;\n  },\n\n  /**\n   * Try to cancel an ongoing upload or download.\n   * @memberof Tinode.LargeFileHelper#\n   */\n  cancel: function() {\n    if (this.xhr && this.xhr.readyState < 4) {\n      this.xhr.abort();\n    }\n  },\n\n  /**\n   * Get unique id of this request.\n   * @memberof Tinode.LargeFileHelper#\n   *\n   * @returns {string} unique id\n   */\n  getId: function() {\n    return this._msgId;\n  }\n};\n\n/**\n * @class Message - definition a communication message.\n * Work in progress.\n * @memberof Tinode\n *\n * @param {string} topic_ - name of the topic the message belongs to.\n * @param {string | Drafty} content_ - message contant.\n */\nvar Message = function(topic_, content_) {\n  this.status = Message.STATUS_NONE;\n  this.topic = topic_;\n  this.content = content_;\n}\n\nMessage.STATUS_NONE = MESSAGE_STATUS_NONE;\nMessage.STATUS_QUEUED = MESSAGE_STATUS_QUEUED;\nMessage.STATUS_SENDING = MESSAGE_STATUS_SENDING;\nMessage.STATUS_FAILED = MESSAGE_STATUS_FAILED;\nMessage.STATUS_SENT = MESSAGE_STATUS_SENT;\nMessage.STATUS_RECEIVED = MESSAGE_STATUS_RECEIVED;\nMessage.STATUS_READ = MESSAGE_STATUS_READ;\nMessage.STATUS_TO_ME = MESSAGE_STATUS_TO_ME;\n\nMessage.prototype = {\n  /**\n   * Convert message object to {pub} packet.\n   */\n  toJSON: function() {\n\n  },\n  /**\n   * Parse JSON into message.\n   */\n  fromJSON: function(json) {\n\n  }\n}\nMessage.prototype.constructor = Message;\n\nif (typeof module != 'undefined') {\n  module.exports = Tinode;\n  module.exports.Drafty = Drafty;\n  module.exports.AccessMode = AccessMode;\n}\n","module.exports={\"version\": \"0.16.9-rc2\"}\n"]} +//# 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r(e,n,t){function o(i,f){if(!n[i]){if(!e[i]){var c=\"function\"==typeof require&&require;if(!f&&c)return c(i,!0);if(u)return u(i,!0);var a=new Error(\"Cannot find module '\"+i+\"'\");throw a.code=\"MODULE_NOT_FOUND\",a}var p=n[i]={exports:{}};e[i][0].call(p.exports,function(r){var n=e[i][1][r];return o(n||r)},p,p.exports,r,e,n,t)}return n[i].exports}for(var u=\"function\"==typeof require&&require,i=0;i<t.length;i++)o(t[i]);return o}return r})()","/**\n * @copyright 2015-2019 Tinode\n * @summary Minimally rich text representation and formatting for Tinode.\n * @license Apache 2.0\n * @version 0.16\n *\n * @file Basic parser and formatter for very simple text markup. Mostly targeted at\n * mobile use cases similar to Telegram, WhatsApp, and FB Messenger.\n *\n * <p>Supports conversion of user keyboard input to formatted text:</p>\n * <ul>\n *   <li>*abc* &rarr; <b>abc</b></li>\n *   <li>_abc_ &rarr; <i>abc</i></li>\n *   <li>~abc~ &rarr; <del>abc</del></li>\n *   <li>`abc` &rarr; <tt>abc</tt></li>\n * </ul>\n * Also supports forms and buttons.\n *\n * Nested formatting is supported, e.g. *abc _def_* -> <b>abc <i>def</i></b>\n * URLs, @mentions, and #hashtags are extracted and converted into links.\n * Forms and buttons can be added procedurally.\n * JSON data representation is inspired by Draft.js raw formatting.\n *\n *\n * @example\n * Text:\n * <pre>\n *     this is *bold*, `code` and _italic_, ~strike~\n *     combined *bold and _italic_*\n *     an url: https://www.example.com/abc#fragment and another _www.tinode.co_\n *     this is a @mention and a #hashtag in a string\n *     second #hashtag\n * </pre>\n *\n *  Sample JSON representation of the text above:\n *  {\n *     \"txt\": \"this is bold, code and italic, strike combined bold and italic an url: https://www.example.com/abc#fragment \" +\n *             \"and another www.tinode.co this is a @mention and a #hashtag in a string second #hashtag\",\n *     \"fmt\": [\n *         { \"at\":8, \"len\":4,\"tp\":\"ST\" },{ \"at\":14, \"len\":4, \"tp\":\"CO\" },{ \"at\":23, \"len\":6, \"tp\":\"EM\"},\n *         { \"at\":31, \"len\":6, \"tp\":\"DL\" },{ \"tp\":\"BR\", \"len\":1, \"at\":37 },{ \"at\":56, \"len\":6, \"tp\":\"EM\" },\n *         { \"at\":47, \"len\":15, \"tp\":\"ST\" },{ \"tp\":\"BR\", \"len\":1, \"at\":62 },{ \"at\":120, \"len\":13, \"tp\":\"EM\" },\n *         { \"at\":71, \"len\":36, \"key\":0 },{ \"at\":120, \"len\":13, \"key\":1 },{ \"tp\":\"BR\", \"len\":1, \"at\":133 },\n *         { \"at\":144, \"len\":8, \"key\":2 },{ \"at\":159, \"len\":8, \"key\":3 },{ \"tp\":\"BR\", \"len\":1, \"at\":179 },\n *         { \"at\":187, \"len\":8, \"key\":3 },{ \"tp\":\"BR\", \"len\":1, \"at\":195 }\n *     ],\n *     \"ent\": [\n *         { \"tp\":\"LN\", \"data\":{ \"url\":\"https://www.example.com/abc#fragment\" } },\n *         { \"tp\":\"LN\", \"data\":{ \"url\":\"http://www.tinode.co\" } },\n *         { \"tp\":\"MN\", \"data\":{ \"val\":\"mention\" } },\n *         { \"tp\":\"HT\", \"data\":{ \"val\":\"hashtag\" } }\n *     ]\n *  }\n */\n\n'use strict';\n\nconst MAX_FORM_ELEMENTS = 8;\nconst JSON_MIME_TYPE = 'application/json';\n\n// Regular expressions for parsing inline formats. Javascript does not support lookbehind,\n// so it's a bit messy.\nconst INLINE_STYLES = [\n  // Strong = bold, *bold text*\n  {\n    name: 'ST',\n    start: /(?:^|[\\W_])(\\*)[^\\s*]/,\n    end: /[^\\s*](\\*)(?=$|[\\W_])/\n  },\n  // Emphesized = italic, _italic text_\n  {\n    name: 'EM',\n    start: /(?:^|\\W)(_)[^\\s_]/,\n    end: /[^\\s_](_)(?=$|\\W)/\n  },\n  // Deleted, ~strike this though~\n  {\n    name: 'DL',\n    start: /(?:^|[\\W_])(~)[^\\s~]/,\n    end: /[^\\s~](~)(?=$|[\\W_])/\n  },\n  // Code block `this is monospace`\n  {\n    name: 'CO',\n    start: /(?:^|\\W)(`)[^`]/,\n    end: /[^`](`)(?=$|\\W)/\n  }\n];\n\n// RegExps for entity extraction (RF = reference)\nconst ENTITY_TYPES = [\n  // URLs\n  {\n    name: 'LN',\n    dataName: 'url',\n    pack: function(val) {\n      // Check if the protocol is specified, if not use http\n      if (!/^[a-z]+:\\/\\//i.test(val)) {\n        val = 'http://' + val;\n      }\n      return {\n        url: val\n      };\n    },\n    re: /(?:(?:https?|ftp):\\/\\/|www\\.|ftp\\.)[-A-Z0-9+&@#\\/%=~_|$?!:,.]*[A-Z0-9+&@#\\/%=~_|$]/ig\n  },\n  // Mentions @user (must be 2 or more characters)\n  {\n    name: 'MN',\n    dataName: 'val',\n    pack: function(val) {\n      return {\n        val: val.slice(1)\n      };\n    },\n    re: /\\B@(\\w\\w+)/g\n  },\n  // Hashtags #hashtag, like metion 2 or more characters.\n  {\n    name: 'HT',\n    dataName: 'val',\n    pack: function(val) {\n      return {\n        val: val.slice(1)\n      };\n    },\n    re: /\\B#(\\w\\w+)/g\n  }\n];\n\n// HTML tag name suggestions\nconst HTML_TAGS = {\n  ST: {\n    name: 'b',\n    isVoid: false\n  },\n  EM: {\n    name: 'i',\n    isVoid: false\n  },\n  DL: {\n    name: 'del',\n    isVoid: false\n  },\n  CO: {\n    name: 'tt',\n    isVoid: false\n  },\n  BR: {\n    name: 'br',\n    isVoid: true\n  },\n  LN: {\n    name: 'a',\n    isVoid: false\n  },\n  MN: {\n    name: 'a',\n    isVoid: false\n  },\n  HT: {\n    name: 'a',\n    isVoid: false\n  },\n  IM: {\n    name: 'img',\n    isVoid: true\n  },\n  FM: {\n    name: 'div',\n    isVoid: false\n  },\n  RW: {\n    name: 'div',\n    isVoid: false,\n  },\n  BN: {\n    name: 'button',\n    isVoid: false\n  },\n  HD: {\n    name: '',\n    isVoid: false\n  }\n};\n\n// Convert base64-encoded string into Blob.\nfunction base64toObjectUrl(b64, contentType) {\n  if (!b64) {\n    return null;\n  }\n\n  try {\n    const bin = atob(b64);\n    const length = bin.length;\n    const buf = new ArrayBuffer(length);\n    const arr = new Uint8Array(buf);\n    for (let i = 0; i < length; i++) {\n      arr[i] = bin.charCodeAt(i);\n    }\n\n    return URL.createObjectURL(new Blob([buf], {\n      type: contentType\n    }));\n  } catch (err) {\n    console.log(\"Drafty: failed to convert object.\", err.message);\n  }\n\n  return null;\n}\n\nfunction base64toDataUrl(b64, contentType) {\n  if (!b64) {\n    return null;\n  }\n  contentType = contentType || 'image/jpeg';\n  return 'data:' + contentType + ';base64,' + b64;\n}\n\n// Helpers for converting Drafty to HTML.\nconst DECORATORS = {\n  // Visial styles\n  ST: {\n    open: function() {\n      return '<b>';\n    },\n    close: function() {\n      return '</b>';\n    }\n  },\n  EM: {\n    open: function() {\n      return '<i>';\n    },\n    close: function() {\n      return '</i>'\n    }\n  },\n  DL: {\n    open: function() {\n      return '<del>';\n    },\n    close: function() {\n      return '</del>'\n    }\n  },\n  CO: {\n    open: function() {\n      return '<tt>';\n    },\n    close: function() {\n      return '</tt>'\n    }\n  },\n  // Line break\n  BR: {\n    open: function() {\n      return '<br/>';\n    },\n    close: function() {\n      return ''\n    }\n  },\n  // Hidden element\n  HD: {\n    open: function() {\n      return '';\n    },\n    close: function() {\n      return '';\n    }\n  },\n  // Link (URL)\n  LN: {\n    open: function(data) {\n      return '<a href=\"' + data.url + '\">';\n    },\n    close: function(data) {\n      return '</a>';\n    },\n    props: function(data) {\n      return data ? {\n        href: data.url,\n        target: \"_blank\"\n      } : null;\n    },\n  },\n  // Mention\n  MN: {\n    open: function(data) {\n      return '<a href=\"#' + data.val + '\">';\n    },\n    close: function(data) {\n      return '</a>';\n    },\n    props: function(data) {\n      return data ? {\n        name: data.val\n      } : null;\n    },\n  },\n  // Hashtag\n  HT: {\n    open: function(data) {\n      return '<a href=\"#' + data.val + '\">';\n    },\n    close: function(data) {\n      return '</a>';\n    },\n    props: function(data) {\n      return data ? {\n        name: data.val\n      } : null;\n    },\n  },\n  // Button\n  BN: {\n    open: function(data) {\n      return '<button>';\n    },\n    close: function(data) {\n      return '</button>';\n    },\n    props: function(data) {\n      return data ? {\n        'data-act': data.act,\n        'data-val': data.val,\n        'data-name': data.name,\n        'data-ref': data.ref\n      } : null;\n    },\n  },\n  // Image\n  IM: {\n    open: function(data) {\n      // Don't use data.ref for preview: it's a security risk.\n      const tmpPreviewUrl = base64toDataUrl(data._tempPreview, data.mime);\n      const previewUrl = base64toObjectUrl(data.val, data.mime);\n      const downloadUrl = data.ref || previewUrl;\n      return (data.name ? '<a href=\"' + downloadUrl + '\" download=\"' + data.name + '\">' : '') +\n        '<img src=\"' + (tmpPreviewUrl || previewUrl) + '\"' +\n        (data.width ? ' width=\"' + data.width + '\"' : '') +\n        (data.height ? ' height=\"' + data.height + '\"' : '') + ' border=\"0\" />';\n    },\n    close: function(data) {\n      return (data.name ? '</a>' : '');\n    },\n    props: function(data) {\n      if (!data) return null;\n      return {\n        // Temporary preview, or permanent preview, or external link.\n        src: base64toDataUrl(data._tempPreview, data.mime) ||\n          data.ref || base64toObjectUrl(data.val, data.mime),\n        title: data.name,\n        'data-width': data.width,\n        'data-height': data.height,\n        'data-name': data.name,\n        'data-size': data.val ? ((data.val.length * 0.75) | 0) : (data.size | 0),\n        'data-mime': data.mime\n      };\n    },\n  },\n  // Form - structured layout of elements.\n  FM: {\n    open: function(data) {\n      return '<div>';\n    },\n    close: function(data) {\n      return '</div>';\n    }\n  },\n  // Row: logic grouping of elements\n  RW: {\n    open: function(data) {\n      return '<div>';\n    },\n    close: function(data) {\n      return '</div>';\n    }\n  }\n};\n\n/**\n * The main object which performs all the formatting actions.\n * @class Drafty\n * @constructor\n */\nvar Drafty = function() {}\n\n// Take a string and defined earlier style spans, re-compose them into a tree where each leaf is\n// a same-style (including unstyled) string. I.e. 'hello *bold _italic_* and ~more~ world' ->\n// ('hello ', (b: 'bold ', (i: 'italic')), ' and ', (s: 'more'), ' world');\n//\n// This is needed in order to clear markup, i.e. 'hello *world*' -> 'hello world' and convert\n// ranges from markup-ed offsets to plain text offsets.\nfunction chunkify(line, start, end, spans) {\n  const chunks = [];\n\n  if (spans.length == 0) {\n    return [];\n  }\n\n  for (let i in spans) {\n    // Get the next chunk from the queue\n    const span = spans[i];\n\n    // Grab the initial unstyled chunk\n    if (span.start > start) {\n      chunks.push({\n        text: line.slice(start, span.start)\n      });\n    }\n\n    // Grab the styled chunk. It may include subchunks.\n    const chunk = {\n      type: span.type\n    };\n    const chld = chunkify(line, span.start + 1, span.end, span.children);\n    if (chld.length > 0) {\n      chunk.children = chld;\n    } else {\n      chunk.text = span.text;\n    }\n    chunks.push(chunk);\n    start = span.end + 1; // '+1' is to skip the formatting character\n  }\n\n  // Grab the remaining unstyled chunk, after the last span\n  if (start < end) {\n    chunks.push({\n      text: line.slice(start, end)\n    });\n  }\n\n  return chunks;\n}\n\n// Inverse of chunkify. Returns a tree of formatted spans.\nfunction forEach(line, start, end, spans, formatter, context) {\n  const result = [];\n\n  // Process ranges calling formatter for each range.\n  for (let i = 0; i < spans.length; i++) {\n    const span = spans[i];\n    if (span.at < 0) {\n      // throw out non-visual spans.\n      continue;\n    }\n    // Add un-styled range before the styled span starts.\n    if (start < span.at) {\n      result.push(formatter.call(context, null, undefined, line.slice(start, span.at), result.length));\n      start = span.at;\n    }\n    // Get all spans which are within current span.\n    const subspans = [];\n    for (let si = i + 1; si < spans.length && spans[si].at < span.at + span.len; si++) {\n      subspans.push(spans[si]);\n      i = si;\n    }\n\n    const tag = HTML_TAGS[span.tp] || {}\n    result.push(formatter.call(context, span.tp, span.data,\n      tag.isVoid ? null : forEach(line, start, span.at + span.len, subspans, formatter, context),\n      result.length));\n\n    start = span.at + span.len;\n  }\n\n  // Add the last unformatted range.\n  if (start < end) {\n    result.push(formatter.call(context, null, undefined, line.slice(start, end), result.length));\n  }\n\n  return result;\n}\n\n// Detect starts and ends of formatting spans. Unformatted spans are\n// ignored at this stage.\nfunction spannify(original, re_start, re_end, type) {\n  const result = [];\n  let index = 0;\n  let line = original.slice(0); // make a copy;\n\n  while (line.length > 0) {\n    // match[0]; // match, like '*abc*'\n    // match[1]; // match captured in parenthesis, like 'abc'\n    // match['index']; // offset where the match started.\n\n    // Find the opening token.\n    const start = re_start.exec(line);\n    if (start == null) {\n      break;\n    }\n\n    // Because javascript RegExp does not support lookbehind, the actual offset may not point\n    // at the markup character. Find it in the matched string.\n    let start_offset = start['index'] + start[0].lastIndexOf(start[1]);\n    // Clip the processed part of the string.\n    line = line.slice(start_offset + 1);\n    // start_offset is an offset within the clipped string. Convert to original index.\n    start_offset += index;\n    // Index now point to the beginning of 'line' within the 'original' string.\n    index = start_offset + 1;\n\n    // Find the matching closing token.\n    const end = re_end ? re_end.exec(line) : null;\n    if (end == null) {\n      break;\n    }\n    let end_offset = end['index'] + end[0].indexOf(end[1]);\n    // Clip the processed part of the string.\n    line = line.slice(end_offset + 1);\n    // Update offsets\n    end_offset += index;\n    // Index now point to the beginning of 'line' within the 'original' string.\n    index = end_offset + 1;\n\n    result.push({\n      text: original.slice(start_offset + 1, end_offset),\n      children: [],\n      start: start_offset,\n      end: end_offset,\n      type: type\n    });\n  }\n\n  return result;\n}\n\n// Convert linear array or spans into a tree representation.\n// Keep standalone and nested spans, throw away partially overlapping spans.\nfunction toTree(spans) {\n  if (spans.length == 0) {\n    return [];\n  }\n\n  const tree = [spans[0]];\n  let last = spans[0];\n  for (let i = 1; i < spans.length; i++) {\n    // Keep spans which start after the end of the previous span or those which\n    // are complete within the previous span.\n\n    if (spans[i].start > last.end) {\n      // Span is completely outside of the previous span.\n      tree.push(spans[i]);\n      last = spans[i];\n    } else if (spans[i].end < last.end) {\n      // Span is fully inside of the previous span. Push to subnode.\n      last.children.push(spans[i]);\n    }\n    // Span could partially overlap, ignoring it as invalid.\n  }\n\n  // Recursively rearrange the subnodes.\n  for (let i in tree) {\n    tree[i].children = toTree(tree[i].children);\n  }\n\n  return tree;\n}\n\n// Get a list of entities from a text.\nfunction extractEntities(line) {\n  let match;\n  let extracted = [];\n  ENTITY_TYPES.map(function(entity) {\n    while ((match = entity.re.exec(line)) !== null) {\n      extracted.push({\n        offset: match['index'],\n        len: match[0].length,\n        unique: match[0],\n        data: entity.pack(match[0]),\n        type: entity.name\n      });\n    }\n  });\n\n  if (extracted.length == 0) {\n    return extracted;\n  }\n\n  // Remove entities detected inside other entities, like #hashtag in a URL.\n  extracted.sort(function(a, b) {\n    return a.offset - b.offset;\n  });\n\n  let idx = -1;\n  extracted = extracted.filter(function(el) {\n    const result = (el.offset > idx);\n    idx = el.offset + el.len;\n    return result;\n  });\n\n  return extracted;\n}\n\n// Convert the chunks into format suitable for serialization.\nfunction draftify(chunks, startAt) {\n  let plain = \"\";\n  let ranges = [];\n  for (let i in chunks) {\n    const chunk = chunks[i];\n    if (!chunk.text) {\n      const drafty = draftify(chunk.children, plain.length + startAt);\n      chunk.text = drafty.txt;\n      ranges = ranges.concat(drafty.fmt);\n    }\n\n    if (chunk.type) {\n      ranges.push({\n        at: plain.length + startAt,\n        len: chunk.text.length,\n        tp: chunk.type\n      });\n    }\n\n    plain += chunk.text;\n  }\n  return {\n    txt: plain,\n    fmt: ranges\n  };\n}\n\n// Splice two strings: insert second string into the first one at the given index\nfunction splice(src, at, insert) {\n  return src.slice(0, at) + insert + src.slice(at);\n}\n\n/**\n * Parse plain text into Drafty document.\n * @memberof Drafty\n * @static\n *\n * @param {String} content plain-text content to parse.\n * @return {Drafty} parsed object or null if the source is not plain text.\n */\nDrafty.parse = function(content) {\n  // Make sure we are parsing strings only.\n  if (typeof content != 'string') {\n    return null;\n  }\n\n  // Split text into lines. It makes further processing easier.\n  const lines = content.split(/\\r?\\n/);\n\n  // Holds entities referenced from text\n  const entityMap = [];\n  const entityIndex = {};\n\n  // Processing lines one by one, hold intermediate result in blx.\n  const blx = [];\n  lines.map(function(line) {\n    let spans = [];\n    let entities;\n\n    // Find formatted spans in the string.\n    // Try to match each style.\n    INLINE_STYLES.map(function(style) {\n      // Each style could be matched multiple times.\n      spans = spans.concat(spannify(line, style.start, style.end, style.name));\n    });\n\n    let block;\n    if (spans.length == 0) {\n      block = {\n        txt: line\n      };\n    } else {\n      // Sort spans by style occurence early -> late\n      spans.sort(function(a, b) {\n        return a.start - b.start;\n      });\n\n      // Convert an array of possibly overlapping spans into a tree\n      spans = toTree(spans);\n\n      // Build a tree representation of the entire string, not\n      // just the formatted parts.\n      const chunks = chunkify(line, 0, line.length, spans);\n\n      const drafty = draftify(chunks, 0);\n\n      block = {\n        txt: drafty.txt,\n        fmt: drafty.fmt\n      };\n    }\n\n    // Extract entities from the cleaned up string.\n    entities = extractEntities(block.txt);\n    if (entities.length > 0) {\n      const ranges = [];\n      for (let i in entities) {\n        // {offset: match['index'], unique: match[0], len: match[0].length, data: ent.packer(), type: ent.name}\n        const entity = entities[i];\n        let index = entityIndex[entity.unique];\n        if (!index) {\n          index = entityMap.length;\n          entityIndex[entity.unique] = index;\n          entityMap.push({\n            tp: entity.type,\n            data: entity.data\n          });\n        }\n        ranges.push({\n          at: entity.offset,\n          len: entity.len,\n          key: index\n        });\n      }\n      block.ent = ranges;\n    }\n\n    blx.push(block);\n  });\n\n  const result = {\n    txt: \"\"\n  };\n\n  // Merge lines and save line breaks as BR inline formatting.\n  if (blx.length > 0) {\n    result.txt = blx[0].txt;\n    result.fmt = (blx[0].fmt || []).concat(blx[0].ent || []);\n\n    for (let i = 1; i < blx.length; i++) {\n      const block = blx[i];\n      const offset = result.txt.length + 1;\n\n      result.fmt.push({\n        tp: 'BR',\n        len: 1,\n        at: offset - 1\n      });\n\n      result.txt += \" \" + block.txt;\n      if (block.fmt) {\n        result.fmt = result.fmt.concat(block.fmt.map(function(s) {\n          s.at += offset;\n          return s;\n        }));\n      }\n      if (block.ent) {\n        result.fmt = result.fmt.concat(block.ent.map(function(s) {\n          s.at += offset;\n          return s;\n        }));\n      }\n    }\n\n    if (result.fmt.length == 0) {\n      delete result.fmt;\n    }\n\n    if (entityMap.length > 0) {\n      result.ent = entityMap;\n    }\n  }\n  return result;\n}\n\n/**\n * Initialize Drafty document to a plain text string.\n *\n * @param {String} plainText string to use as Drafty content.\n *\n * @returns new Drafty document or null is plainText is not a string.\n */\nDrafty.init = function(plainText) {\n  if (typeof plainText != 'string') {\n    return null;\n  }\n  return {\n    txt: plainText\n  };\n}\n\n/**\n * Append one Drafty document to another.\n *\n * @param {Drafty} first Drafty document to append to.\n * @param {Drafty} second Drafty document being appended.\n *\n * @return {Drafty} first document with the second appended to it.\n */\nDrafty.append = function(first, second) {\n  if (first == null) {\n    return second;\n  }\n  if (second == null) {\n    return first;\n  }\n\n  first.txt = first.txt || '';\n  second.txt = second.txt || '';\n  const len = first.txt.length;\n\n  first.txt += second.txt;\n  if (Array.isArray(second.fmt)) {\n    first.fmt = first.fmt || [];\n    if (Array.isArray(second.ent)) {\n      first.ent = first.ent || [];\n    }\n    second.fmt.forEach(src => {\n      const fmt = {\n        at: src.at + len,\n        len: src.len\n      };\n      if (src.tp) {\n        fmt.tp = src.tp;\n      } else {\n        fmt.key = first.ent.length;\n        first.ent.push(second.ent[src.key || 0]);\n      }\n      first.fmt.push(fmt);\n    });\n  }\n\n  return first;\n}\n\n/**\n * @typedef Drafty.ImageDesc\n * @memberof Drafty\n * @type Object\n * @param {string} mime mime-type of the image, e.g. \"image/png\"\n * @param {string} preview base64-encoded image content (or preview, if large image is attached). Could be null/undefined.\n * @param {integer} width width of the image\n * @param {integer} height height of the image\n * @param {string} filename file name suggestion for downloading the image.\n * @param {integer} size size of the image in bytes. Treat is as an untrusted hint.\n * @param {string} refurl reference to the content. Could be null/undefined.\n * @param {string} _tempPreview base64-encoded image preview used during upload process; not serializable.\n * @param {Promise} urlPromise Promise which returns content URL when resolved.\n */\n\n/**\n * Insert inline image into Drafty document.\n * @memberof Drafty\n * @static\n *\n * @param {Drafty} content object to add image to.\n * @param {integer} at index where the object is inserted. The length of the image is always 1.\n * @param {ImageDesc} imageDesc object with image paramenets and data.\n *\n * @return {Drafty} updated content.\n */\nDrafty.insertImage = function(content, at, imageDesc) {\n  content = content || {\n    txt: \" \"\n  };\n  content.ent = content.ent || [];\n  content.fmt = content.fmt || [];\n\n  content.fmt.push({\n    at: at,\n    len: 1,\n    key: content.ent.length\n  });\n\n  const ex = {\n    tp: 'IM',\n    data: {\n      mime: imageDesc.mime,\n      val: imageDesc.preview,\n      width: imageDesc.width,\n      height: imageDesc.height,\n      name: imageDesc.filename,\n      size: imageDesc.size | 0,\n      ref: imageDesc.refurl\n    }\n  };\n\n  if (imageDesc.urlPromise) {\n    ex.data._tempPreview = imageDesc._tempPreview;\n    ex.data._processing = true;\n    imageDesc.urlPromise.then(\n      (url) => {\n        ex.data.ref = url;\n        ex.data._tempPreview = undefined;\n        ex.data._processing = undefined;\n      },\n      (err) => {\n        /* catch the error, otherwise it will appear in the console. */\n        ex.data._processing = undefined;\n      }\n    );\n  }\n\n  content.ent.push(ex);\n\n  return content;\n}\n\n/**\n * Append inline image to Drafty content.\n * @memberof Drafty\n * @static\n *\n * @param {Drafty} content object to add image to.\n * @param {ImageDesc} imageDesc object with image paramenets.\n *\n * @return {Drafty} updated content.\n */\nDrafty.appendImage = function(content, imageDesc) {\n  content = content || {\n    txt: \"\"\n  };\n  content.txt += \" \";\n  return Drafty.insertImage(content, content.txt.length - 1, imageDesc);\n}\n\n/**\n * @typedef Drafty.AttachmentDesc\n * @memberof Drafty\n * @type Object\n * @param {string} mime mime-type of the image, e.g. \"image/png\"\n * @param {string} data base64-encoded in-band content of small attachments. Could be null/undefined.\n * @param {string} filename file name suggestion for downloading the attachment.\n * @param {integer} size size of the file in bytes. Treat is as an untrusted hint.\n * @param {string} refurl reference to the out-of-band content. Could be null/undefined.\n * @param {Promise} urlPromise Promise which returns content URL when resolved.\n */\n\n/**\n * Attach file to Drafty content. Either as a blob or as a reference.\n * @memberof Drafty\n * @static\n *\n * @param {Drafty} content object to attach file to.\n * @param {AttachmentDesc} object containing attachment description and data.\n *\n * @return {Drafty} updated content.\n */\nDrafty.attachFile = function(content, attachmentDesc) {\n  content = content || {\n    txt: \"\"\n  };\n  content.ent = content.ent || [];\n  content.fmt = content.fmt || [];\n\n  content.fmt.push({\n    at: -1,\n    len: 0,\n    key: content.ent.length\n  });\n\n  const ex = {\n    tp: 'EX',\n    data: {\n      mime: attachmentDesc.mime,\n      val: attachmentDesc.data,\n      name: attachmentDesc.filename,\n      ref: attachmentDesc.refurl,\n      size: attachmentDesc.size | 0\n    }\n  }\n  if (attachmentDesc.urlPromise) {\n    ex.data._processing = true;\n    attachmentDesc.urlPromise.then(\n      (url) => {\n        ex.data.ref = url;\n        ex.data._processing = undefined;\n      },\n      (err) => {\n        /* catch the error, otherwise it will appear in the console. */\n        ex.data._processing = undefined;\n      }\n    );\n  }\n  content.ent.push(ex);\n\n  return content;\n}\n\n/**\n * Wraps content into an interactive form.\n * @memberof Drafty\n * @static\n *\n * @param {Drafty|string} content to wrap into a form.\n * @param {number} at index where the forms starts.\n * @param {number} len length of the form content.\n *\n * @return {Drafty} updated content.\n */\nDrafty.wrapAsForm = function(content, at, len) {\n  if (typeof content == 'string') {\n    content = {\n      txt: content\n    };\n  }\n  content.fmt = content.fmt || [];\n\n  content.fmt.push({\n    at: at,\n    len: len,\n    tp: 'FM'\n  });\n\n  return content;\n}\n\n/**\n * Insert clickable button into Drafty document.\n * @memberof Drafty\n * @static\n *\n * @param {Drafty|string} content is Drafty object to insert button to or a string to be used as button text.\n * @param {number} at is location where the button is inserted.\n * @param {number} len is the length of the text to be used as button title.\n * @param {string} name of the button. Client should return it to the server when the button is clicked.\n * @param {string} actionType is the type of the button, one of 'url' or 'pub'.\n * @param {string} actionValue is the value to return on click:\n * @param {string} refUrl is the URL to go to when the 'url' button is clicked.\n *\n * @return {Drafty} updated content.\n */\nDrafty.insertButton = function(content, at, len, name, actionType, actionValue, refUrl) {\n  if (typeof content == 'string') {\n    content = {\n      txt: content\n    };\n  }\n\n  if (!content || !content.txt || content.txt.length < at + len) {\n    return null;\n  }\n\n  if (len <= 0 || ['url', 'pub'].indexOf(actionType) == -1) {\n    return null;\n  }\n  // Ensure refUrl is a string.\n  if (actionType == 'url' && !refUrl) {\n    return null;\n  }\n  refUrl = '' + refUrl;\n\n  content.ent = content.ent || [];\n  content.fmt = content.fmt || [];\n\n  content.fmt.push({\n    at: at,\n    len: len,\n    key: content.ent.length\n  });\n  content.ent.push({\n    tp: 'BN',\n    data: {\n      act: actionType,\n      val: actionValue,\n      ref: refUrl,\n      name: name\n    }\n  });\n\n  return content;\n}\n\n/**\n * Append clickable button to Drafty document.\n * @memberof Drafty\n * @static\n *\n * @param {Drafty|string} content is Drafty object to insert button to or a string to be used as button text.\n * @param {string} title is the text to be used as button title.\n * @param {string} name of the button. Client should return it to the server when the button is clicked.\n * @param {string} actionType is the type of the button, one of 'url' or 'pub'.\n * @param {string} actionValue is the value to return on click:\n * @param {string} refUrl is the URL to go to when the 'url' button is clicked.\n *\n * @return {Drafty} updated content.\n */\nDrafty.appendButton = function(content, title, name, actionType, actionValue, refUrl) {\n  content = content || {\n    txt: \"\"\n  };\n  const at = content.txt.length;\n  content.txt += title;\n  return Drafty.insertButton(content, at, title.length, name, actionType, actionValue, refUrl);\n}\n\n/**\n * Attach a generic JS object. The object is attached as a json string.\n * Intended for representing a form response.\n *\n * @memberof Drafty\n * @static\n *\n * @param {Drafty} content object to attach file to.\n * @param {Object} data to convert to json string and attach.\n */\nDrafty.attachJSON = function(content, data) {\n  content = content || {\n    txt: \"\"\n  };\n  content.ent = content.ent || [];\n  content.fmt = content.fmt || [];\n\n  content.fmt.push({\n    at: -1,\n    len: 0,\n    key: content.ent.length\n  });\n\n  content.ent.push({\n    tp: 'EX',\n    data: {\n      mime: JSON_MIME_TYPE,\n      val: data\n    }\n  });\n\n  return content;\n}\n\nDrafty.appendLineBreak = function(content) {\n  content = content || {\n    txt: \"\"\n  };\n  content.fmt = content.fmt || [];\n  content.fmt.push({\n    at: content.txt.length,\n    len: 1,\n    tp: 'BR'\n  });\n  content.txt += \" \";\n\n  return content;\n}\n/**\n * Given the structured representation of rich text, convert it to HTML.\n * No attempt is made to strip pre-existing html markup.\n * This is potentially unsafe because `content.txt` may contain malicious\n * markup.\n * @memberof Tinode.Drafty\n * @static\n *\n * @param {drafy} content - structured representation of rich text.\n *\n * @return HTML-representation of content.\n */\nDrafty.UNSAFE_toHTML = function(content) {\n  let {\n    txt,\n    fmt,\n    ent\n  } = content;\n\n  const markup = [];\n  if (fmt) {\n    for (let i in fmt) {\n      const range = fmt[i];\n      let tp = range.tp;\n      let data;\n      if (!tp) {\n        const entity = ent[range.key | 0];\n        if (entity) {\n          tp = entity.tp;\n          data = entity.data;\n        }\n      }\n\n      if (DECORATORS[tp]) {\n        // Because we later sort in descending order, closing markup must come first.\n        // Otherwise zero-length objects will not be represented correctly.\n        markup.push({\n          idx: range.at + range.len,\n          len: -range.len,\n          what: DECORATORS[tp].close(data)\n        });\n        markup.push({\n          idx: range.at,\n          len: range.len,\n          what: DECORATORS[tp].open(data)\n        });\n      }\n    }\n  }\n\n  markup.sort(function(a, b) {\n    return b.idx == a.idx ? b.len - a.len : b.idx - a.idx; // in descending order\n  });\n\n  for (let i in markup) {\n    if (markup[i].what) {\n      txt = splice(txt, markup[i].idx, markup[i].what);\n    }\n  }\n\n  return txt;\n}\n\n/**\n * Callback for applying custom formatting/transformation to a Drafty object.\n * Called once for each syle span.\n * @memberof Drafty\n * @static\n *\n * @callback Formatter\n * @param {string} style style code such as \"ST\" or \"IM\".\n * @param {Object} data entity's data\n * @param {Object} values possibly styled subspans contained in this style span.\n * @param {number} index of the current element among its siblings.\n */\n\n/**\n * Transform Drafty using custom formatting.\n * @memberof Drafty\n * @static\n *\n * @param {Drafty} content - content to transform.\n * @param {Formatter} formatter - callback which transforms individual elements\n * @param {Object} context - context provided to formatter as 'this'.\n *\n * @return {Object} transformed object\n */\nDrafty.format = function(content, formatter, context) {\n  let {\n    txt,\n    fmt,\n    ent\n  } = content;\n\n  // Assign default values.\n  txt = txt || \"\";\n  if (!Array.isArray(ent)) {\n    ent = [];\n  }\n\n  if (!Array.isArray(fmt)) {\n    // Handle special case when all values in fmt are 0 and fmt is skipped.\n    if (ent.length == 1) {\n      fmt = [{\n        at: 0,\n        len: 0,\n        key: 0\n      }];\n    } else {\n      return [txt];\n    }\n  }\n\n  let spans = [].concat(fmt);\n\n  // Zero values may have been stripped. Restore them.\n  // Also ensure indexes and lengths are sane.\n  spans.map(function(s) {\n    s.at = s.at || 0;\n    s.len = s.len || 0;\n    if (s.len < 0) {\n      s.len = 0;\n    }\n    if (s.at < -1) {\n      s.at = -1;\n    }\n  });\n\n  // Sort spans first by start index (asc) then by length (desc).\n  spans.sort(function(a, b) {\n    if (a.at - b.at == 0) {\n      return b.len - a.len; // longer one comes first (<0)\n    }\n    return a.at - b.at;\n  });\n\n  // Denormalize entities into spans. Create a copy of the objects to leave\n  // original Drafty object unchanged.\n  spans = spans.map((s) => {\n    let data;\n    let tp = s.tp;\n    if (!tp) {\n      s.key = s.key || 0;\n      if (ent[s.key]) {\n        data = ent[s.key].data;\n        tp = ent[s.key].tp;\n      }\n    }\n\n    // Type still not defined? Hide invalid element.\n    tp = tp || 'HD';\n\n    return {\n      tp: tp,\n      data: data,\n      at: s.at,\n      len: s.len\n    };\n  });\n\n  return forEach(txt, 0, txt.length, spans, formatter, context);\n}\n\n/**\n * Given structured representation of rich text, convert it to plain text.\n * @memberof Drafty\n * @static\n *\n * @param {Drafty} content - content to convert to plain text.\n */\nDrafty.toPlainText = function(content) {\n  return typeof content == 'string' ? content : content.txt;\n}\n\n/**\n * Returns true if content has no markup and no entities.\n * @memberof Drafty\n * @static\n *\n * @param {Drafty} content - content to check for presence of markup.\n * @returns true is content is plain text, false otherwise.\n */\nDrafty.isPlainText = function(content) {\n  return typeof content == 'string' || !(content.fmt || content.ent);\n}\n\n/**\n * Checks if the object represets is a valid Drafty document.\n * @memberof Drafty\n * @static\n *\n * @param {Drafty} content - content to check for validity.\n * @returns true is content is valid, false otherwise.\n */\nDrafty.isValid = function(content) {\n  if (!content) {\n    return false;\n  }\n\n  const {\n    txt,\n    fmt,\n    ent\n  } = content;\n\n  if (!txt && txt !== '' && !fmt && !ent) {\n    return false;\n  }\n\n  const txt_type = typeof txt;\n  if (txt_type != 'string' && txt_type != 'undefined' && txt !== null) {\n    return false;\n  }\n\n  if (typeof fmt != 'undefined' && !Array.isArray(fmt) && fmt !== null) {\n    return false;\n  }\n\n  if (typeof ent != 'undefined' && !Array.isArray(ent) && ent !== null) {\n    return false;\n  }\n  return true;\n}\n\n/**\n * Check if the drafty content has attachments.\n * @memberof Drafty\n * @static\n *\n * @param {Drafty} content - content to check for attachments.\n * @returns true if there are attachments.\n */\nDrafty.hasAttachments = function(content) {\n  if (content.ent && content.ent.length > 0) {\n    for (let i in content.ent) {\n      if (content.ent[i] && content.ent[i].tp == 'EX') {\n        return true;\n      }\n    }\n  }\n  return false;\n}\n\n/**\n * Callback for applying custom formatting/transformation to a Drafty object.\n * Called once for each syle span.\n * @memberof Drafty\n * @static\n *\n * @callback AttachmentCallback\n * @param {Object} data attachment data\n * @param {number} index attachment's index in `content.ent`.\n */\n\n/**\n * Enumerate attachments.\n * @memberof Drafty\n * @static\n *\n * @param {Drafty} content - drafty object to process for attachments.\n * @param {AttachmentCallback} callback - callback to call for each attachment.\n * @param {Object} context - value of \"this\" for callback.\n */\nDrafty.attachments = function(content, callback, context) {\n  if (content.ent && content.ent.length > 0) {\n    for (let i in content.ent) {\n      if (content.ent[i] && content.ent[i].tp == 'EX') {\n        callback.call(context, content.ent[i].data, i);\n      }\n    }\n  }\n}\n\n/**\n * Given the entity, get URL which can be used for downloading\n * entity data.\n * @memberof Drafty\n * @static\n *\n * @param {Object} entity.data to get the URl from.\n */\nDrafty.getDownloadUrl = function(entData) {\n  let url = null;\n  if (entData.mime != JSON_MIME_TYPE && entData.val) {\n    url = base64toObjectUrl(entData.val, entData.mime);\n  } else if (typeof entData.ref == 'string') {\n    url = entData.ref;\n  }\n  return url;\n}\n\n/**\n * Check if the entity data is not ready for sending, such as being uploaded to the server.\n * @memberof Drafty\n * @static\n *\n * @param {Object} entity.data to get the URl from.\n * @returns {boolean} true if upload is in progress, false otherwise.\n */\nDrafty.isProcessing = function(entData) {\n  return !!entData._processing;\n}\n\n/**\n * Given the entity, get URL which can be used for previewing\n * the entity.\n * @memberof Drafty\n * @static\n *\n * @param {Object} entity.data to get the URl from.\n *\n * @returns {string} url for previewing or null if no such url is available.\n */\nDrafty.getPreviewUrl = function(entData) {\n  return entData.val ? base64toObjectUrl(entData.val, entData.mime) : null;\n}\n\n/**\n * Get approximate size of the entity.\n * @memberof Drafty\n * @static\n *\n * @param {Object} entity.data to get the size for.\n */\nDrafty.getEntitySize = function(entData) {\n  // Either size hint or length of value. The value is base64 encoded,\n  // the actual object size is smaller than the encoded length.\n  return entData.size ? entData.size : entData.val ? (entData.val.length * 0.75) | 0 : 0;\n}\n\n/**\n * Get entity mime type.\n * @memberof Drafty\n * @static\n *\n * @param {Object} entity.data to get the type for.\n */\nDrafty.getEntityMimeType = function(entData) {\n  return entData.mime || 'text/plain';\n}\n\n/**\n * Get HTML tag for a given two-letter style name\n * @memberof Drafty\n * @static\n *\n * @param {string} style - two-letter style, like ST or LN\n *\n * @returns {string} tag name\n */\nDrafty.tagName = function(style) {\n  return HTML_TAGS[style] ? HTML_TAGS[style].name : undefined;\n}\n\n/**\n * For a given data bundle generate an object with HTML attributes,\n * for instance, given {url: \"http://www.example.com/\"} return\n * {href: \"http://www.example.com/\"}\n * @memberof Drafty\n * @static\n *\n * @param {string} style - two-letter style to generate attributes for.\n * @param {Object} data - data bundle to convert to attributes\n *\n * @returns {Object} object with HTML attributes.\n */\nDrafty.attrValue = function(style, data) {\n  if (data && DECORATORS[style]) {\n    return DECORATORS[style].props(data);\n  }\n\n  return undefined;\n}\n\n/**\n * Drafty MIME type.\n * @memberof Drafty\n * @static\n *\n * @returns {string} HTTP Content-Type \"text/x-drafty\".\n */\nDrafty.getContentType = function() {\n  return 'text/x-drafty';\n}\n\nif (typeof module != 'undefined') {\n  module.exports = Drafty;\n}\n","/**\n * @file SDK to connect to Tinode chat server.\n * See <a href=\"https://github.com/tinode/webapp\">\n * https://github.com/tinode/webapp</a> for real-life usage.\n *\n * @copyright 2015-2019 Tinode\n * @summary Javascript bindings for Tinode.\n * @license Apache 2.0\n * @version 0.16\n *\n * @example\n * <head>\n * <script src=\".../tinode.js\"></script>\n * </head>\n *\n * <body>\n *  ...\n * <script>\n *  // Instantiate tinode.\n *  const tinode = new Tinode(APP_NAME, HOST, API_KEY, null, true);\n *  tinode.enableLogging(true);\n *  // Add logic to handle disconnects.\n *  tinode.onDisconnect = function(err) { ... };\n *  // Connect to the server.\n *  tinode.connect().then(() => {\n *    // Connected. Login now.\n *    return tinode.loginBasic(login, password);\n *  }).then((ctrl) => {\n *    // Logged in fine, attach callbacks, subscribe to 'me'.\n *    const me = tinode.getMeTopic();\n *    me.onMetaDesc = function(meta) { ... };\n *    // Subscribe, fetch topic description and the list of contacts.\n *    me.subscribe({get: {desc: {}, sub: {}});\n *  }).catch((err) => {\n *    // Login or subscription failed, do something.\n *    ...\n *  });\n *  ...\n * </script>\n * </body>\n */\n'use strict';\n\n// NOTE TO DEVELOPERS:\n// Localizable strings should be double quoted \"строка на другом языке\",\n// non-localizable strings should be single quoted 'non-localized'.\n\nif (typeof require == 'function') {\n  if (typeof Drafty == 'undefined') {\n    var Drafty = require('./drafty.js');\n  }\n  var package_version = require('../version.json').version;\n}\n\nlet WebSocketProvider;\nif (typeof WebSocket != 'undefined') {\n  WebSocketProvider = WebSocket;\n}\n\nlet XHRProvider;\nif (typeof XMLHttpRequest != 'undefined') {\n  XHRProvider = XMLHttpRequest;\n}\ninitForNonBrowserApp();\n\n// Global constants\nconst PROTOCOL_VERSION = '0';\nconst VERSION = package_version || '0.16';\nconst LIBRARY = 'tinodejs/' + VERSION;\n\nconst TOPIC_NEW = 'new';\nconst TOPIC_NEW_CHAN = 'nch';\nconst TOPIC_ME = 'me';\nconst TOPIC_FND = 'fnd';\nconst TOPIC_SYS = 'sys';\nconst TOPIC_CHAN = 'chn';\nconst USER_NEW = 'new';\n\n// Starting value of a locally-generated seqId used for pending messages.\nconst LOCAL_SEQID = 0xFFFFFFF;\n\nconst MESSAGE_STATUS_NONE = 0; // Status not assigned.\nconst MESSAGE_STATUS_QUEUED = 1; // Local ID assigned, in progress to be sent.\nconst MESSAGE_STATUS_SENDING = 2; // Transmission started.\nconst MESSAGE_STATUS_FAILED = 3; // At least one attempt was made to send the message.\nconst MESSAGE_STATUS_SENT = 4; // Delivered to the server.\nconst MESSAGE_STATUS_RECEIVED = 5; // Received by the client.\nconst MESSAGE_STATUS_READ = 6; // Read by the user.\nconst MESSAGE_STATUS_TO_ME = 7; // Message from another user.\n\n// Error code to return in case of a network problem.\nconst NETWORK_ERROR = 503;\nconst NETWORK_ERROR_TEXT = \"Connection failed\";\n\n// Reject unresolved futures after this many milliseconds.\nconst EXPIRE_PROMISES_TIMEOUT = 5000;\n// Periodicity of garbage collection of unresolved futures.\nconst EXPIRE_PROMISES_PERIOD = 1000;\n\n// Error code to return when user disconnected from server.\nconst NETWORK_USER = 418;\nconst NETWORK_USER_TEXT = \"Disconnected by client\";\n\n// Utility functions\n\n// Add brower missing function for non browser app, eg nodeJs\nfunction initForNonBrowserApp() {\n  // Tinode requirement in native mode because react native doesn't provide Base64 method\n  const chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=';\n\n  if (typeof btoa == 'undefined') {\n    const chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=';\n    global.btoa = function(input = '') {\n      let str = input;\n      let output = '';\n\n      for (let block = 0, charCode, i = 0, map = chars; str.charAt(i | 0) || (map = '=', i % 1); output += map.charAt(63 & block >> 8 - i % 1 * 8)) {\n\n        charCode = str.charCodeAt(i += 3 / 4);\n\n        if (charCode > 0xFF) {\n          throw new Error(\"'btoa' failed: The string to be encoded contains characters outside of the Latin1 range.\");\n        }\n\n        block = block << 8 | charCode;\n      }\n\n      return output;\n    };\n  }\n\n  if (typeof atob == 'undefined') {\n    global.atob = function(input = '') {\n      let str = input.replace(/=+$/, '');\n      let output = '';\n\n      if (str.length % 4 == 1) {\n        throw new Error(\"'atob' failed: The string to be decoded is not correctly encoded.\");\n      }\n      for (let bc = 0, bs = 0, buffer, i = 0; buffer = str.charAt(i++);\n\n        ~buffer && (bs = bc % 4 ? bs * 64 + buffer : buffer,\n          bc++ % 4) ? output += String.fromCharCode(255 & bs >> (-2 * bc & 6)) : 0\n      ) {\n        buffer = chars.indexOf(buffer);\n      }\n\n      return output;\n    };\n  }\n\n  if (typeof window == 'undefined') {\n    global.window = {\n      WebSocket: WebSocketProvider,\n      XMLHttpRequest: XHRProvider,\n      URL: {\n        createObjectURL: function() {\n          throw new Error(\"Unable to use URL.createObjectURL in a non-browser application\");\n        }\n      }\n    }\n  }\n}\n\n// RFC3339 formater of Date\nfunction rfc3339DateString(d) {\n  if (!d || d.getTime() == 0) {\n    return undefined;\n  }\n\n  function pad(val, sp) {\n    sp = sp || 2;\n    return '0'.repeat(sp - ('' + val).length) + val;\n  }\n\n  const millis = d.getUTCMilliseconds();\n  return d.getUTCFullYear() + '-' + pad(d.getUTCMonth() + 1) + '-' + pad(d.getUTCDate()) +\n    'T' + pad(d.getUTCHours()) + ':' + pad(d.getUTCMinutes()) + ':' + pad(d.getUTCSeconds()) +\n    (millis ? '.' + pad(millis, 3) : '') + 'Z';\n}\n\n// btoa replacement. Stock btoa fails on on non-Latin1 strings.\nfunction b64EncodeUnicode(str) {\n  // The encodeURIComponent percent-encodes UTF-8 string,\n  // then the percent encoding is converted into raw bytes which\n  // can be fed into btoa.\n  return btoa(encodeURIComponent(str).replace(/%([0-9A-F]{2})/g,\n    function toSolidBytes(match, p1) {\n      return String.fromCharCode('0x' + p1);\n    }));\n}\n\n// Recursively merge src's own properties to dst.\n// Ignore properties where ignore[property] is true.\n// Array and Date objects are shallow-copied.\nfunction mergeObj(dst, src, ignore) {\n  if (typeof src != 'object') {\n    if (src === Tinode.DEL_CHAR) {\n      return undefined;\n    }\n    if (src === undefined) {\n      return dst;\n    }\n    return src;\n  }\n  // JS is crazy: typeof null is 'object'.\n  if (src === null) {\n    return src;\n  }\n\n  // Handle Date\n  if (src instanceof Date) {\n    return (!dst || !(dst instanceof Date) || dst < src) ? src : dst;\n  }\n\n  // Access mode\n  if (src instanceof AccessMode) {\n    return new AccessMode(src);\n  }\n\n  // Handle Array\n  if (src instanceof Array) {\n    return src;\n  }\n\n  if (!dst || dst === Tinode.DEL_CHAR) {\n    dst = src.constructor();\n  }\n\n  for (let prop in src) {\n    if (src.hasOwnProperty(prop) &&\n      (!ignore || !ignore[prop]) &&\n      (prop != '_noForwarding')) {\n\n      dst[prop] = mergeObj(dst[prop], src[prop]);\n    }\n  }\n  return dst;\n}\n\n// Update object stored in a cache. Returns updated value.\nfunction mergeToCache(cache, key, newval, ignore) {\n  cache[key] = mergeObj(cache[key], newval, ignore);\n  return cache[key];\n}\n\nfunction stringToDate(obj) {\n  if (typeof obj.created == 'string') {\n    obj.created = new Date(obj.created);\n  }\n  if (typeof obj.updated == 'string') {\n    obj.updated = new Date(obj.updated);\n  }\n  if (typeof obj.touched == 'string') {\n    obj.touched = new Date(obj.touched);\n  }\n}\n\n// JSON stringify helper - pre-processor for JSON.stringify\nfunction jsonBuildHelper(key, val) {\n  if (val instanceof Date) {\n    // Convert javascript Date objects to rfc3339 strings\n    val = rfc3339DateString(val);\n  } else if (val instanceof AccessMode) {\n    val = val.jsonHelper();\n  } else if (val === undefined || val === null || val === false ||\n    (Array.isArray(val) && val.length == 0) ||\n    ((typeof val == 'object') && (Object.keys(val).length == 0))) {\n    // strip out empty elements while serializing objects to JSON\n    return undefined;\n  }\n\n  return val;\n};\n\n// Strips all values from an object of they evaluate to false or if their name starts with '_'.\nfunction simplify(obj) {\n  Object.keys(obj).forEach(function(key) {\n    if (key[0] == '_') {\n      // Strip fields like \"obj._key\".\n      delete obj[key];\n    } else if (!obj[key]) {\n      // Strip fields which evaluate to false.\n      delete obj[key];\n    } else if (Array.isArray(obj[key]) && obj[key].length == 0) {\n      // Strip empty arrays.\n      delete obj[key];\n    } else if (!obj[key]) {\n      // Strip fields which evaluate to false.\n      delete obj[key];\n    } else if (typeof obj[key] == 'object' && !(obj[key] instanceof Date)) {\n      simplify(obj[key]);\n      // Strip empty objects.\n      if (Object.getOwnPropertyNames(obj[key]).length == 0) {\n        delete obj[key];\n      }\n    }\n  });\n  return obj;\n};\n\n// Trim whitespace, strip empty and duplicate elements elements.\n// If the result is an empty array, add a single element \"\\u2421\" (Unicode Del character).\nfunction normalizeArray(arr) {\n  let out = [];\n  if (Array.isArray(arr)) {\n    // Trim, throw away very short and empty tags.\n    for (let i = 0, l = arr.length; i < l; i++) {\n      let t = arr[i];\n      if (t) {\n        t = t.trim().toLowerCase();\n        if (t.length > 1) {\n          out.push(t);\n        }\n      }\n    }\n    out.sort().filter(function(item, pos, ary) {\n      return !pos || item != ary[pos - 1];\n    });\n  }\n  if (out.length == 0) {\n    // Add single tag with a Unicode Del character, otherwise an ampty array\n    // is ambiguos. The Del tag will be stripped by the server.\n    out.push(Tinode.DEL_CHAR);\n  }\n  return out;\n}\n\n// Attempt to convert date strings to objects.\nfunction jsonParseHelper(key, val) {\n  // Convert string timestamps with optional milliseconds to Date\n  // 2015-09-02T01:45:43[.123]Z\n  if (key === 'ts' && typeof val === 'string' &&\n    val.length >= 20 && val.length <= 24) {\n    let date = new Date(val);\n    if (date) {\n      return date;\n    }\n  } else if (key === 'acs' && typeof val === 'object') {\n    return new AccessMode(val);\n  }\n  return val;\n};\n\n// Trims very long strings (encoded images) to make logged packets more readable.\nfunction jsonLoggerHelper(key, val) {\n  if (typeof val == 'string' && val.length > 128) {\n    return '<' + val.length + ', bytes: ' + val.substring(0, 12) + '...' + val.substring(val.length - 12) + '>';\n  }\n  return jsonBuildHelper(key, val);\n};\n\n// Parse browser user agent to extract browser name and version.\nfunction getBrowserInfo(ua, product) {\n  ua = ua || '';\n  let reactnative = '';\n  // Check if this is a ReactNative app.\n  if (/reactnative/i.test(product)) {\n    reactnative = 'ReactNative; ';\n  }\n  // Then test for WebKit based browser.\n  ua = ua.replace(' (KHTML, like Gecko)', '');\n  let m = ua.match(/(AppleWebKit\\/[.\\d]+)/i);\n  let result;\n  if (m) {\n    // List of common strings, from more useful to less useful.\n    let priority = ['chrome', 'safari', 'mobile', 'version'];\n    let tmp = ua.substr(m.index + m[0].length).split(\" \");\n    let tokens = [];\n    // Split Name/0.0.0 into Name and version 0.0.0\n    for (let i = 0; i < tmp.length; i++) {\n      let m2 = /([\\w.]+)[\\/]([\\.\\d]+)/.exec(tmp[i]);\n      if (m2) {\n        tokens.push([m2[1], m2[2], priority.findIndex(function(e) {\n          return (e == m2[1].toLowerCase());\n        })]);\n      }\n    }\n    // Sort by priority: more interesting is earlier than less interesting.\n    tokens.sort(function(a, b) {\n      let diff = a[2] - b[2];\n      return diff != 0 ? diff : b[0].length - a[0].length;\n    });\n    if (tokens.length > 0) {\n      // Return the least common browser string and version.\n      result = tokens[0][0] + '/' + tokens[0][1];\n    } else {\n      // Failed to ID the browser. Return the webkit version.\n      result = m[1];\n    }\n    // Test for MSIE.\n  } else if (/trident/i.test(ua)) {\n    m = /(?:\\brv[ :]+([.\\d]+))|(?:\\bMSIE ([.\\d]+))/g.exec(ua);\n    if (m) {\n      result = 'MSIE/' + (m[1] || m[2]);\n    } else {\n      result = 'MSIE/?';\n    }\n    // Test for Firefox.\n  } else if (/firefox/i.test(ua)) {\n    m = /Firefox\\/([.\\d]+)/g.exec(ua);\n    if (m) {\n      result = 'Firefox/' + m[1];\n    } else {\n      result = 'Firefox/?';\n    }\n    // Older Opera.\n  } else if (/presto/i.test(ua)) {\n    m = /Opera\\/([.\\d]+)/g.exec(ua);\n    if (m) {\n      result = 'Opera/' + m[1];\n    } else {\n      result = 'Opera/?';\n    }\n  } else {\n    // Failed to parse anything meaningfull. Try the last resort.\n    m = /([\\w.]+)\\/([.\\d]+)/.exec(ua);\n    if (m) {\n      result = m[1] + '/' + m[2];\n    } else {\n      m = ua.split(' ');\n      result = m[0];\n    }\n  }\n\n  // Shorten the version to one dot 'a.bb.ccc.d -> a.bb' at most.\n  m = result.split('/');\n  if (m.length > 1) {\n    let v = m[1].split('.');\n    result = m[0] + '/' + v[0] + (v[1] ? '.' + v[1] : '');\n  }\n  return reactnative + result;\n}\n\n/**\n * In-memory sorted cache of objects.\n *\n * @class CBuffer\n * @memberof Tinode\n * @protected\n *\n * @param {function} compare custom comparator of objects. Returns -1 if a < b, 0 if a == b, 1 otherwise.\n * @param {boolean} unique enforce element uniqueness: replace existing element with a new one on conflict.\n */\nvar CBuffer = function(compare, unique) {\n  let buffer = [];\n\n  compare = compare || function(a, b) {\n    return a === b ? 0 : a < b ? -1 : 1;\n  };\n\n  function findNearest(elem, arr, exact) {\n    let start = 0;\n    let end = arr.length - 1;\n    let pivot = 0;\n    let diff = 0;\n    let found = false;\n\n    while (start <= end) {\n      pivot = (start + end) / 2 | 0;\n      diff = compare(arr[pivot], elem);\n      if (diff < 0) {\n        start = pivot + 1;\n      } else if (diff > 0) {\n        end = pivot - 1;\n      } else {\n        found = true;\n        break;\n      }\n    }\n    if (found) {\n      return {\n        idx: pivot,\n        exact: true\n      };\n    }\n    if (exact) {\n      return {\n        idx: -1\n      };\n    }\n    // Not exact - insertion point\n    return {\n      idx: diff < 0 ? pivot + 1 : pivot\n    };\n  }\n\n  // Insert element into a sorted array.\n  function insertSorted(elem, arr) {\n    const found = findNearest(elem, arr, false);\n    const count = (found.exact && unique) ? 1 : 0;\n    arr.splice(found.idx, count, elem);\n    return arr;\n  }\n\n  return {\n    /**\n     * Get an element at the given position.\n     * @memberof Tinode.CBuffer#\n     * @param {number} at - Position to fetch from.\n     * @returns {Object} Element at the given position or <tt>undefined</tt>\n     */\n    getAt: function(at) {\n      return buffer[at];\n    },\n\n    /**\n     * Convenience method for getting the last element of the buffer.\n     * @memberof Tinode.CBuffer#\n     * @returns {Object} The last element in the buffer or <tt>undefined</tt> if buffer is empty.\n     */\n    getLast: function() {\n      return buffer.length > 0 ? buffer[buffer.length - 1] : undefined;\n    },\n\n    /** Add new element(s) to the buffer. Variadic: takes one or more arguments. If an array is passed as a single\n     * argument, its elements are inserted individually.\n     * @memberof Tinode.CBuffer#\n     *\n     * @param {...Object|Array} - One or more objects to insert.\n     */\n    put: function() {\n      let insert;\n      // inspect arguments: if array, insert its elements, if one or more non-array arguments, insert them one by one\n      if (arguments.length == 1 && Array.isArray(arguments[0])) {\n        insert = arguments[0];\n      } else {\n        insert = arguments;\n      }\n      for (let idx in insert) {\n        insertSorted(insert[idx], buffer);\n      }\n    },\n\n    /**\n     * Remove element at the given position.\n     * @memberof Tinode.CBuffer#\n     * @param {number} at - Position to delete at.\n     * @returns {Object} Element at the given position or <tt>undefined</tt>\n     */\n    delAt: function(at) {\n      let r = buffer.splice(at, 1);\n      if (r && r.length > 0) {\n        return r[0];\n      }\n      return undefined;\n    },\n\n    /**\n     * Remove elements between two positions.\n     * @memberof Tinode.CBuffer#\n     * @param {number} since - Position to delete from (inclusive).\n     * @param {number} before - Position to delete to (exclusive).\n     *\n     * @returns {Array} array of removed elements (could be zero length).\n     */\n    delRange: function(since, before) {\n      return buffer.splice(since, before - since);\n    },\n\n    /**\n     * Return the number of elements the buffer holds.\n     * @memberof Tinode.CBuffer#\n     * @return {number} Number of elements in the buffer.\n     */\n    length: function() {\n      return buffer.length;\n    },\n\n    /**\n     * Reset the buffer discarding all elements\n     * @memberof Tinode.CBuffer#\n     */\n    reset: function() {\n      buffer = [];\n    },\n\n    /**\n     * Callback for iterating contents of buffer. See {@link Tinode.CBuffer#forEach}.\n     * @callback ForEachCallbackType\n     * @memberof Tinode.CBuffer#\n     * @param {Object} elem - Element of the buffer.\n     * @param {number} index - Index of the current element.\n     */\n\n    /**\n     * Apply given function `callback` to all elements of the buffer.\n     * @memberof Tinode.CBuffer#\n     *\n     * @param {Tinode.ForEachCallbackType} callback - Function to call for each element.\n     * @param {integer} startIdx - Optional index to start iterating from (inclusive).\n     * @param {integer} beforeIdx - Optional index to stop iterating before (exclusive).\n     * @param {Object} context - calling context (i.e. value of 'this' in callback)\n     */\n    forEach: function(callback, startIdx, beforeIdx, context) {\n      startIdx = startIdx | 0;\n      beforeIdx = beforeIdx || buffer.length;\n      for (let i = startIdx; i < beforeIdx; i++) {\n        callback.call(context, buffer[i], i);\n      }\n    },\n\n    /**\n     * Find element in buffer using buffer's comparison function.\n     * @memberof Tinode.CBuffer#\n     *\n     * @param {Object} elem - element to find.\n     * @param {boolean=} nearest - when true and exact match is not found, return the nearest element (insertion point).\n     * @returns {number} index of the element in the buffer or -1.\n     */\n    find: function(elem, nearest) {\n      const {\n        idx\n      } = findNearest(elem, buffer, !nearest);\n      return idx;\n    }\n  }\n}\n\n// Helper function for creating an endpoint URL\nfunction makeBaseUrl(host, protocol, apiKey) {\n  let url = null;\n\n  if (protocol === 'http' || protocol === 'https' || protocol === 'ws' || protocol === 'wss') {\n    url = protocol + '://';\n    url += host;\n    if (url.charAt(url.length - 1) !== '/') {\n      url += '/';\n    }\n    url += 'v' + PROTOCOL_VERSION + '/channels';\n    if (protocol === 'http' || protocol === 'https') {\n      // Long polling endpoint end with \"lp\", i.e.\n      // '/v0/channels/lp' vs just '/v0/channels' for ws\n      url += '/lp';\n    }\n    url += '?apikey=' + apiKey;\n  }\n\n  return url;\n}\n\n/**\n * An abstraction for a websocket or a long polling connection.\n *\n * @class Connection\n * @memberof Tinode\n *\n * @param {string} host_ - Host name and port number to connect to.\n * @param {string} apiKey_ - API key generated by keygen\n * @param {string} transport_ - Network transport to use, either `ws`/`wss` for websocket or `lp` for long polling.\n * @param {boolean} secure_ - Use secure WebSocket (wss) if true.\n * @param {boolean} autoreconnect_ - If connection is lost, try to reconnect automatically.\n */\nvar Connection = function(host_, apiKey_, transport_, secure_, autoreconnect_) {\n  let host = host_;\n  let secure = secure_;\n  let apiKey = apiKey_;\n\n  let autoreconnect = autoreconnect_;\n\n  // Settings for exponential backoff\n  const _BOFF_BASE = 2000; // 2000 milliseconds, minimum delay between reconnects\n  const _BOFF_MAX_ITER = 10; // Maximum delay between reconnects 2^10 * 2000 ~ 34 minutes\n  const _BOFF_JITTER = 0.3; // Add random delay\n\n  let _boffTimer = null;\n  let _boffIteration = 0;\n  let _boffClosed = false; // Indicator if the socket was manually closed - don't autoreconnect if true.\n\n  let log = (text, ...args) => {\n    if (this.logger) {\n      this.logger(text, ...args);\n    }\n  }\n\n  // Backoff implementation - reconnect after a timeout.\n  function boffReconnect() {\n    // Clear timer\n    clearTimeout(_boffTimer);\n    // Calculate when to fire the reconnect attempt\n    const timeout = _BOFF_BASE * (Math.pow(2, _boffIteration) * (1.0 + _BOFF_JITTER * Math.random()));\n    // Update iteration counter for future use\n    _boffIteration = (_boffIteration >= _BOFF_MAX_ITER ? _boffIteration : _boffIteration + 1);\n    if (this.onAutoreconnectIteration) {\n      this.onAutoreconnectIteration(timeout);\n    }\n\n    _boffTimer = setTimeout(() => {\n      log(\"Reconnecting, iter=\" + _boffIteration + \", timeout=\" + timeout);\n      // Maybe the socket was closed while we waited for the timer?\n      if (!_boffClosed) {\n        const prom = this.connect();\n        if (this.onAutoreconnectIteration) {\n          this.onAutoreconnectIteration(0, prom);\n        } else {\n          // Suppress error if it's not used.\n          prom.catch(() => {\n            /* do nothing */\n          });\n        }\n      } else if (this.onAutoreconnectIteration) {\n        this.onAutoreconnectIteration(-1);\n      }\n    }, timeout);\n  }\n\n  // Terminate auto-reconnect process.\n  function boffStop() {\n    clearTimeout(_boffTimer);\n    _boffTimer = null;\n  }\n\n  // Reset auto-reconnect iteration counter.\n  function boffReset() {\n    _boffIteration = 0;\n  }\n\n  // Initialization for Websocket\n  function init_ws(instance) {\n    let _socket = null;\n\n    /**\n     * Initiate a new connection\n     * @memberof Tinode.Connection#\n     * @param {string} host_ Host name to connect to; if null the old host name will be used.\n     * @param {boolean} force Force new connection even if one already exists.\n     * @return {Promise} Promise resolved/rejected when the connection call completes, resolution is called without parameters, rejection passes the {Error} as parameter.\n     */\n    instance.connect = function(host_, force) {\n      _boffClosed = false;\n\n      if (_socket) {\n        if (!force && _socket.readyState == _socket.OPEN) {\n          return Promise.resolve();\n        }\n        _socket.close();\n        _socket = null;\n      }\n\n      if (host_) {\n        host = host_;\n      }\n\n      return new Promise(function(resolve, reject) {\n        const url = makeBaseUrl(host, secure ? 'wss' : 'ws', apiKey);\n\n        log(\"Connecting to: \", url);\n\n        // It throws when the server is not accessible but the exception cannot be caught:\n        // https://stackoverflow.com/questions/31002592/javascript-doesnt-catch-error-in-websocket-instantiation/31003057\n        const conn = new WebSocketProvider(url);\n\n        conn.onerror = function(err) {\n          reject(err);\n        }\n\n        conn.onopen = function(evt) {\n          if (autoreconnect) {\n            boffStop();\n          }\n\n          if (instance.onOpen) {\n            instance.onOpen();\n          }\n\n          resolve();\n        }\n\n        conn.onclose = function(evt) {\n          _socket = null;\n\n          if (instance.onDisconnect) {\n            const code = _boffClosed ? NETWORK_USER : NETWORK_ERROR;\n            instance.onDisconnect(new Error(_boffClosed ? NETWORK_USER_TEXT : NETWORK_ERROR_TEXT +\n              ' (' + code + ')'), code);\n          }\n\n          if (!_boffClosed && autoreconnect) {\n            boffReconnect.call(instance);\n          }\n        }\n\n        conn.onmessage = function(evt) {\n          if (instance.onMessage) {\n            instance.onMessage(evt.data);\n          }\n        }\n        _socket = conn;\n      });\n    }\n\n    /**\n     * Try to restore a network connection, also reset backoff.\n     * @memberof Tinode.Connection#\n     *\n     * @param {boolean} force - reconnect even if there is a live connection already.\n     */\n    instance.reconnect = function(force) {\n      boffStop();\n      instance.connect(null, force);\n    }\n\n    /**\n     * Terminate the network connection\n     * @memberof Tinode.Connection#\n     */\n    instance.disconnect = function() {\n      _boffClosed = true;\n      boffStop();\n\n      if (!_socket) {\n        return;\n      }\n      _socket.close();\n      _socket = null;\n    }\n\n    /**\n     * Send a string to the server.\n     * @memberof Tinode.Connection#\n     *\n     * @param {string} msg - String to send.\n     * @throws Throws an exception if the underlying connection is not live.\n     */\n    instance.sendText = function(msg) {\n      if (_socket && (_socket.readyState == _socket.OPEN)) {\n        _socket.send(msg);\n      } else {\n        throw new Error(\"Websocket is not connected\");\n      }\n    };\n\n    /**\n     * Check if socket is alive.\n     * @memberof Tinode.Connection#\n     * @returns {boolean} true if connection is live, false otherwise\n     */\n    instance.isConnected = function() {\n      return (_socket && (_socket.readyState == _socket.OPEN));\n    }\n\n    /**\n     * Get the name of the current network transport.\n     * @memberof Tinode.Connection#\n     * @returns {string} name of the transport such as 'ws' or 'lp'.\n     */\n    instance.transport = function() {\n      return 'ws';\n    }\n\n    /**\n     * Send network probe to check if connection is indeed live.\n     * @memberof Tinode.Connection#\n     */\n    instance.probe = function() {\n      instance.sendText('1');\n    }\n  }\n\n  // Initialization for long polling.\n  function init_lp(instance) {\n    const XDR_UNSENT = 0; //\tClient has been created. open() not called yet.\n    const XDR_OPENED = 1; //\topen() has been called.\n    const XDR_HEADERS_RECEIVED = 2; // send() has been called, and headers and status are available.\n    const XDR_LOADING = 3; //\tDownloading; responseText holds partial data.\n    const XDR_DONE = 4; // The operation is complete.\n    // Fully composed endpoint URL, with API key & SID\n    let _lpURL = null;\n\n    let _poller = null;\n    let _sender = null;\n\n    function lp_sender(url_) {\n      let sender = new XMLHttpRequest();\n      sender.onreadystatechange = function(evt) {\n        if (sender.readyState == XDR_DONE && sender.status >= 400) {\n          // Some sort of error response\n          throw new Error(\"LP sender failed, \" + sender.status);\n        }\n      }\n\n      sender.open('POST', url_, true);\n      return sender;\n    }\n\n    function lp_poller(url_, resolve, reject) {\n      let poller = new XMLHttpRequest();\n      let promiseCompleted = false;\n\n      poller.onreadystatechange = function(evt) {\n\n        if (poller.readyState == XDR_DONE) {\n          if (poller.status == 201) { // 201 == HTTP.Created, get SID\n            let pkt = JSON.parse(poller.responseText, jsonParseHelper);\n            _lpURL = url_ + '&sid=' + pkt.ctrl.params.sid\n            poller = lp_poller(_lpURL);\n            poller.send(null)\n            if (instance.onOpen) {\n              instance.onOpen();\n            }\n\n            if (resolve) {\n              promiseCompleted = true;\n              resolve();\n            }\n\n            if (autoreconnect) {\n              boffStop();\n            }\n          } else if (poller.status < 400) { // 400 = HTTP.BadRequest\n            if (instance.onMessage) {\n              instance.onMessage(poller.responseText)\n            }\n            poller = lp_poller(_lpURL);\n            poller.send(null);\n          } else {\n            // Don't throw an error here, gracefully handle server errors\n            if (reject && !promiseCompleted) {\n              promiseCompleted = true;\n              reject(poller.responseText);\n            }\n            if (instance.onMessage && poller.responseText) {\n              instance.onMessage(poller.responseText);\n            }\n            if (instance.onDisconnect) {\n              const code = poller.status || (_boffClosed ? NETWORK_USER : NETWORK_ERROR);\n              const text = poller.responseText || (_boffClosed ? NETWORK_USER_TEXT : NETWORK_ERROR_TEXT);\n              instance.onDisconnect(new Error(text + ' (' + code + ')'), code);\n            }\n\n            // Polling has stopped. Indicate it by setting poller to null.\n            poller = null;\n            if (!_boffClosed && autoreconnect) {\n              boffReconnect.call(instance);\n            }\n          }\n        }\n      }\n      poller.open('GET', url_, true);\n      return poller;\n    }\n\n    instance.connect = function(host_, force) {\n      _boffClosed = false;\n\n      if (_poller) {\n        if (!force) {\n          return Promise.resolve();\n        }\n        _poller.onreadystatechange = undefined;\n        _poller.abort();\n        _poller = null;\n      }\n\n      if (host_) {\n        host = host_;\n      }\n\n      return new Promise(function(resolve, reject) {\n        const url = makeBaseUrl(host, secure ? 'https' : 'http', apiKey);\n        log(\"Connecting to: \", url);\n        _poller = lp_poller(url, resolve, reject);\n        _poller.send(null)\n      }).catch((err) => {\n        console.log(\"LP connection failed:\", err);\n      });\n    };\n\n    instance.reconnect = function(force) {\n      boffStop();\n      instance.connect(null, force);\n    };\n\n    instance.disconnect = function() {\n      _boffClosed = true;\n      boffStop();\n\n      if (_sender) {\n        _sender.onreadystatechange = undefined;\n        _sender.abort();\n        _sender = null;\n      }\n      if (_poller) {\n        _poller.onreadystatechange = undefined;\n        _poller.abort();\n        _poller = null;\n      }\n\n      if (instance.onDisconnect) {\n        instance.onDisconnect(new Error(NETWORK_USER_TEXT + ' (' + NETWORK_USER + ')'), NETWORK_USER);\n      }\n      // Ensure it's reconstructed\n      _lpURL = null;\n    }\n\n    instance.sendText = function(msg) {\n      _sender = lp_sender(_lpURL);\n      if (_sender && (_sender.readyState == 1)) { // 1 == OPENED\n        _sender.send(msg);\n      } else {\n        throw new Error(\"Long poller failed to connect\");\n      }\n    };\n\n    instance.isConnected = function() {\n      return (_poller && true);\n    }\n\n    instance.transport = function() {\n      return 'lp';\n    }\n\n    instance.probe = function() {\n      instance.sendText('1');\n    }\n  }\n\n  let initialized = false;\n  if (transport_ === 'lp') {\n    // explicit request to use long polling\n    init_lp(this);\n    initialized = true;\n  } else if (transport_ === 'ws') {\n    // explicit request to use web socket\n    // if websockets are not available, horrible things will happen\n    init_ws(this);\n    initialized = true;\n\n    // Default transport selection\n  } else if (typeof window == 'object') {\n    if (window['WebSocket']) {\n      // Using web sockets -- default.\n      init_ws(this);\n      initialized = true;\n    } else if (window['XMLHttpRequest']) {\n      // The browser has no websockets, using long polling.\n      init_lp(this);\n      initialized = true;\n    }\n  }\n\n  if (!initialized) {\n    // No transport is avaiilable.\n    console.log(\"No network transport is available. Running under Node? Call 'Tinode.setNetworkProviders()'.\");\n    throw new Error(\"No network transport is available. Running under Node? Call 'Tinode.setNetworkProviders()'.\");\n  }\n\n  /**\n   * Check if the given network transport is available.\n   * @memberof Tinode.Connection#\n   * @param {String} trans - either 'ws' (websocket) or 'lp' (long polling).\n   * @returns true if given transport is available, false otherwise.\n   */\n  this.transportAvailable = function(transp) {\n    switch (transp) {\n      case 'ws':\n        return typeof window == 'object' && window['WebSocket'];\n      case 'lp':\n        return typeof window == 'object' && window['XMLHttpRequest'];\n      default:\n        console.log(\"Request for unknown transport\", transp);\n        return false;\n    }\n  }\n\n  /**\n   * Reset autoreconnect counter to zero.\n   * @memberof Tinode.Connection#\n   */\n  this.backoffReset = function() {\n    boffReset();\n  }\n\n  // Callbacks:\n  /**\n   * A callback to pass incoming messages to. See {@link Tinode.Connection#onMessage}.\n   * @callback Tinode.Connection.OnMessage\n   * @memberof Tinode.Connection\n   * @param {string} message - Message to process.\n   */\n  /**\n   * A callback to pass incoming messages to.\n   * @type {Tinode.Connection.OnMessage}\n   * @memberof Tinode.Connection#\n   */\n  this.onMessage = undefined;\n\n  /**\n   * A callback for reporting a dropped connection.\n   * @type {function}\n   * @memberof Tinode.Connection#\n   */\n  this.onDisconnect = undefined;\n\n  /**\n   * A callback called when the connection is ready to be used for sending. For websockets it's socket open,\n   * for long polling it's readyState=1 (OPENED)\n   * @type {function}\n   * @memberof Tinode.Connection#\n   */\n  this.onOpen = undefined;\n\n  /**\n   * A callback to notify of reconnection attempts. See {@link Tinode.Connection#onAutoreconnectIteration}.\n   * @memberof Tinode.Connection\n   * @callback AutoreconnectIterationType\n   * @param {string} timeout - time till the next reconnect attempt in milliseconds. -1 means reconnect was skipped.\n   * @param {Promise} promise resolved or rejected when the reconnect attemp completes.\n   *\n   */\n  /**\n   * A callback to inform when the next attampt to reconnect will happen and to receive connection promise.\n   * @memberof Tinode.Connection#\n   * @type {Tinode.Connection.AutoreconnectIterationType}\n   */\n  this.onAutoreconnectIteration = undefined;\n\n  /**\n   * A callback to log events from Connection. See {@link Tinode.Connection#logger}.\n   * @memberof Tinode.Connection\n   * @callback LoggerCallbackType\n   * @param {string} event - Event to log.\n   */\n  /**\n   * A callback to report logging events.\n   * @memberof Tinode.Connection#\n   * @type {Tinode.Connection.LoggerCallbackType}\n   */\n  this.logger = undefined;\n};\n\n/**\n * @class Tinode\n *\n * @param {string} appname_ - Name of the caliing application to be reported in User Agent.\n * @param {string} host_ - Host name and port number to connect to.\n * @param {string} apiKey_ - API key generated by keygen\n * @param {string} transport_ - See {@link Tinode.Connection#transport}.\n * @param {boolean} secure_ - Use Secure WebSocket if true.\n * @param {string} platform_ - Optional platform identifier, one of \"ios\", \"web\", \"android\".\n */\nvar Tinode = function(appname_, host_, apiKey_, transport_, secure_, platform_) {\n  // Client-provided application name, format <Name>/<version number>\n  if (appname_) {\n    this._appName = appname_;\n  } else {\n    this._appName = \"Undefined\";\n  }\n\n  // API Key.\n  this._apiKey = apiKey_;\n\n  // Name and version of the browser.\n  this._browser = '';\n  this._platform = platform_;\n  this._hwos = 'undefined';\n  this._humanLanguage = 'xx';\n  // Underlying OS.\n  if (typeof navigator != 'undefined') {\n    this._browser = getBrowserInfo(navigator.userAgent, navigator.product);\n    this._hwos = navigator.platform;\n    // This is the default language. It could be changed by client.\n    this._humanLanguage = navigator.language || 'en-US';\n  }\n  // Logging to console enabled\n  this._loggingEnabled = false;\n  // When logging, trip long strings (base64-encoded images) for readability\n  this._trimLongStrings = false;\n  // UID of the currently authenticated user.\n  this._myUID = null;\n  // Status of connection: authenticated or not.\n  this._authenticated = false;\n  // Login used in the last successful basic authentication\n  this._login = null;\n  // Token which can be used for login instead of login/password.\n  this._authToken = null;\n  // Counter of received packets\n  this._inPacketCount = 0;\n  // Counter for generating unique message IDs\n  this._messageId = Math.floor((Math.random() * 0xFFFF) + 0xFFFF);\n  // Information about the server, if connected\n  this._serverInfo = null;\n  // Push notification token. Called deviceToken for consistency with the Android SDK.\n  this._deviceToken = null;\n\n  // Cache of pending promises by message id.\n  this._pendingPromises = {};\n\n  // The Timeout object returned by the reject expired promises setInterval\n  this._expirePromises = null;\n\n\n  /** A connection object, see {@link Tinode.Connection}. */\n  this._connection = new Connection(host_, apiKey_, transport_, secure_, true);\n  // Console logger. Babel somehow fails to parse '...rest' parameter.\n  this.logger = (str, ...args) => {\n    if (this._loggingEnabled) {\n      const d = new Date()\n      const dateString = ('0' + d.getUTCHours()).slice(-2) + ':' +\n        ('0' + d.getUTCMinutes()).slice(-2) + ':' +\n        ('0' + d.getUTCSeconds()).slice(-2) + '.' +\n        ('00' + d.getUTCMilliseconds()).slice(-3);\n\n      console.log('[' + dateString + ']', str, args.join(' '));\n    }\n  }\n  this._connection.logger = this.logger;\n\n  // Tinode's cache of objects\n  this._cache = {};\n\n  const cachePut = this.cachePut = (type, name, obj) => {\n    this._cache[type + ':' + name] = obj;\n  }\n\n  const cacheGet = this.cacheGet = (type, name) => {\n    return this._cache[type + ':' + name];\n  }\n\n  const cacheDel = this.cacheDel = (type, name) => {\n    delete this._cache[type + ':' + name];\n  }\n  // Enumerate all items in cache, call func for each item.\n  // Enumeration stops if func returns true.\n  const cacheMap = this.cacheMap = (func, context) => {\n    for (let idx in this._cache) {\n      if (func(this._cache[idx], idx, context)) {\n        break;\n      }\n    }\n  }\n\n  // Make limited cache management available to topic.\n  // Caching user.public only. Everything else is per-topic.\n  this.attachCacheToTopic = (topic) => {\n    topic._tinode = this;\n\n    topic._cacheGetUser = (uid) => {\n      const pub = cacheGet('user', uid);\n      if (pub) {\n        return {\n          user: uid,\n          public: mergeObj({}, pub)\n        };\n      }\n      return undefined;\n    };\n    topic._cachePutUser = (uid, user) => {\n      return cachePut('user', uid, mergeObj({}, user.public));\n    };\n    topic._cacheDelUser = (uid) => {\n      return cacheDel('user', uid);\n    };\n    topic._cachePutSelf = () => {\n      return cachePut('topic', topic.name, topic);\n    }\n    topic._cacheDelSelf = () => {\n      return cacheDel('topic', topic.name);\n    }\n  }\n\n  // Resolve or reject a pending promise.\n  // Unresolved promises are stored in _pendingPromises.\n  const execPromise = (id, code, onOK, errorText) => {\n    const callbacks = this._pendingPromises[id];\n    if (callbacks) {\n      delete this._pendingPromises[id];\n      if (code >= 200 && code < 400) {\n        if (callbacks.resolve) {\n          callbacks.resolve(onOK);\n        }\n      } else if (callbacks.reject) {\n        callbacks.reject(new Error(errorText + \" (\" + code + \")\"));\n      }\n    }\n  }\n\n  // Generator of default promises for sent packets.\n  const makePromise = (id) => {\n    let promise = null;\n    if (id) {\n      promise = new Promise((resolve, reject) => {\n        // Stored callbacks will be called when the response packet with this Id arrives\n        this._pendingPromises[id] = {\n          'resolve': resolve,\n          'reject': reject,\n          'ts': new Date()\n        };\n      })\n    }\n    return promise;\n  }\n\n  // Generates unique message IDs\n  const getNextUniqueId = this.getNextUniqueId = () => {\n    return (this._messageId != 0) ? '' + this._messageId++ : undefined;\n  }\n\n  // Get User Agent string\n  const getUserAgent = () => {\n    return this._appName + ' (' + (this._browser ? this._browser + '; ' : '') + this._hwos + '); ' + LIBRARY;\n  }\n\n  // Generator of packets stubs\n  this.initPacket = (type, topic) => {\n    switch (type) {\n      case 'hi':\n        return {\n          'hi': {\n            'id': getNextUniqueId(),\n            'ver': VERSION,\n            'ua': getUserAgent(),\n            'dev': this._deviceToken,\n            'lang': this._humanLanguage,\n            'platf': this._platform\n          }\n        };\n\n      case 'acc':\n        return {\n          'acc': {\n            'id': getNextUniqueId(),\n            'user': null,\n            'scheme': null,\n            'secret': null,\n            'login': false,\n            'tags': null,\n            'desc': {},\n            'cred': {}\n          }\n        };\n\n      case 'login':\n        return {\n          'login': {\n            'id': getNextUniqueId(),\n            'scheme': null,\n            'secret': null\n          }\n        };\n\n      case 'sub':\n        return {\n          'sub': {\n            'id': getNextUniqueId(),\n            'topic': topic,\n            'set': {},\n            'get': {}\n          }\n        };\n\n      case 'leave':\n        return {\n          'leave': {\n            'id': getNextUniqueId(),\n            'topic': topic,\n            'unsub': false\n          }\n        };\n\n      case 'pub':\n        return {\n          'pub': {\n            'id': getNextUniqueId(),\n            'topic': topic,\n            'noecho': false,\n            'head': null,\n            'content': {}\n          }\n        };\n\n      case 'get':\n        return {\n          'get': {\n            'id': getNextUniqueId(),\n            'topic': topic,\n            'what': null, // data, sub, desc, space separated list; unknown strings are ignored\n            'desc': {},\n            'sub': {},\n            'data': {}\n          }\n        };\n\n      case 'set':\n        return {\n          'set': {\n            'id': getNextUniqueId(),\n            'topic': topic,\n            'desc': {},\n            'sub': {},\n            'tags': []\n          }\n        };\n\n      case 'del':\n        return {\n          'del': {\n            'id': getNextUniqueId(),\n            'topic': topic,\n            'what': null,\n            'delseq': null,\n            'user': null,\n            'hard': false\n          }\n        };\n\n      case 'note':\n        return {\n          'note': {\n            // no id by design\n            'topic': topic,\n            'what': null, // one of \"recv\", \"read\", \"kp\"\n            'seq': undefined // the server-side message id aknowledged as received or read\n          }\n        };\n\n      default:\n        throw new Error(\"Unknown packet type requested: \" + type);\n    }\n  }\n\n  // Send a packet. If packet id is provided return a promise.\n  this.send = (pkt, id) => {\n    let promise;\n    if (id) {\n      promise = makePromise(id);\n    }\n    pkt = simplify(pkt);\n    let msg = JSON.stringify(pkt);\n    this.logger(\"out: \" + (this._trimLongStrings ? JSON.stringify(pkt, jsonLoggerHelper) : msg));\n    try {\n      this._connection.sendText(msg);\n    } catch (err) {\n      // If sendText throws, wrap the error in a promise or rethrow.\n      if (id) {\n        execPromise(id, NETWORK_ERROR, null, err.message);\n      } else {\n        throw err;\n      }\n    }\n    return promise;\n  }\n\n  // On successful login save server-provided data.\n  this.loginSuccessful = (ctrl) => {\n    if (!ctrl.params || !ctrl.params.user) {\n      return;\n    }\n    // This is a response to a successful login,\n    // extract UID and security token, save it in Tinode module\n    this._myUID = ctrl.params.user;\n    this._authenticated = (ctrl && ctrl.code >= 200 && ctrl.code < 300);\n    if (ctrl.params && ctrl.params.token && ctrl.params.expires) {\n      this._authToken = {\n        token: ctrl.params.token,\n        expires: new Date(ctrl.params.expires)\n      };\n    } else {\n      this._authToken = null;\n    }\n\n    if (this.onLogin) {\n      this.onLogin(ctrl.code, ctrl.text);\n    }\n  }\n\n  // The main message dispatcher.\n  this._connection.onMessage = (data) => {\n    // Skip empty response. This happens when LP times out.\n    if (!data) return;\n\n    this._inPacketCount++;\n\n    // Send raw message to listener\n    if (this.onRawMessage) {\n      this.onRawMessage(data);\n    }\n\n    if (data === '0') {\n      // Server response to a network probe.\n      if (this.onNetworkProbe) {\n        this.onNetworkProbe();\n      }\n      // No processing is necessary.\n      return;\n    }\n\n    let pkt = JSON.parse(data, jsonParseHelper);\n    if (!pkt) {\n      this.logger(\"in: \" + data);\n      this.logger(\"ERROR: failed to parse data\");\n    } else {\n      this.logger(\"in: \" + (this._trimLongStrings ? JSON.stringify(pkt, jsonLoggerHelper) : data));\n\n      // Send complete packet to listener\n      if (this.onMessage) {\n        this.onMessage(pkt);\n      }\n\n      if (pkt.ctrl) {\n        // Handling {ctrl} message\n        if (this.onCtrlMessage) {\n          this.onCtrlMessage(pkt.ctrl);\n        }\n\n        // Resolve or reject a pending promise, if any\n        if (pkt.ctrl.id) {\n          execPromise(pkt.ctrl.id, pkt.ctrl.code, pkt.ctrl, pkt.ctrl.text);\n        }\n        setTimeout(() => {\n          if (pkt.ctrl.code == 205 && pkt.ctrl.text == 'evicted') {\n            // User evicted from topic.\n            const topic = cacheGet('topic', pkt.ctrl.topic);\n            if (topic) {\n              topic._resetSub();\n              if (pkt.ctrl.params && pkt.ctrl.params.unsub) {\n                topic._gone();\n              }\n            }\n          } else if (pkt.ctrl.params && pkt.ctrl.params.what == 'data') {\n            // All messages received: \"params\":{\"count\":11,\"what\":\"data\"},\n            const topic = cacheGet('topic', pkt.ctrl.topic);\n            if (topic) {\n              topic._allMessagesReceived(pkt.ctrl.params.count);\n            }\n          } else if (pkt.ctrl.params && pkt.ctrl.params.what == 'sub') {\n            // The topic has no subscriptions.\n            const topic = cacheGet('topic', pkt.ctrl.topic);\n            if (topic) {\n              // Trigger topic.onSubsUpdated.\n              topic._processMetaSub([]);\n            }\n          }\n        }, 0);\n      } else {\n        setTimeout(() => {\n          if (pkt.meta) {\n            // Handling a {meta} message.\n\n            // Preferred API: Route meta to topic, if one is registered\n            const topic = cacheGet('topic', pkt.meta.topic);\n            if (topic) {\n              topic._routeMeta(pkt.meta);\n            }\n\n            if (pkt.meta.id) {\n              execPromise(pkt.meta.id, 200, pkt.meta, 'META');\n            }\n\n            // Secondary API: callback\n            if (this.onMetaMessage) {\n              this.onMetaMessage(pkt.meta);\n            }\n          } else if (pkt.data) {\n            // Handling {data} message\n\n            // Preferred API: Route data to topic, if one is registered\n            const topic = cacheGet('topic', pkt.data.topic);\n            if (topic) {\n              topic._routeData(pkt.data);\n            }\n\n            // Secondary API: Call callback\n            if (this.onDataMessage) {\n              this.onDataMessage(pkt.data);\n            }\n          } else if (pkt.pres) {\n            // Handling {pres} message\n\n            // Preferred API: Route presence to topic, if one is registered\n            const topic = cacheGet('topic', pkt.pres.topic);\n            if (topic) {\n              topic._routePres(pkt.pres);\n            }\n\n            // Secondary API - callback\n            if (this.onPresMessage) {\n              this.onPresMessage(pkt.pres);\n            }\n          } else if (pkt.info) {\n            // {info} message - read/received notifications and key presses\n\n            // Preferred API: Route {info}} to topic, if one is registered\n            const topic = cacheGet('topic', pkt.info.topic);\n            if (topic) {\n              topic._routeInfo(pkt.info);\n            }\n\n            // Secondary API - callback\n            if (this.onInfoMessage) {\n              this.onInfoMessage(pkt.info);\n            }\n          } else {\n            this.logger(\"ERROR: Unknown packet received.\");\n          }\n        }, 0);\n      }\n    }\n  }\n\n  // Ready to start sending.\n  this._connection.onOpen = () => {\n    if (!this._expirePromises) {\n      // Reject promises which have not been resolved for too long.\n      this._expirePromises = setInterval(() => {\n        const err = new Error(\"Timeout (504)\");\n        const expires = new Date(new Date().getTime() - EXPIRE_PROMISES_TIMEOUT);\n        for (let id in this._pendingPromises) {\n          let callbacks = this._pendingPromises[id];\n          if (callbacks && callbacks.ts < expires) {\n            this.logger(\"Promise expired\", id);\n            delete this._pendingPromises[id];\n            if (callbacks.reject) {\n              callbacks.reject(err);\n            }\n          }\n        }\n      }, EXPIRE_PROMISES_PERIOD);\n    }\n    this.hello();\n  }\n\n  // Wrapper for the reconnect iterator callback.\n  this._connection.onAutoreconnectIteration = (timeout, promise) => {\n    if (this.onAutoreconnectIteration) {\n      this.onAutoreconnectIteration(timeout, promise);\n    }\n  }\n\n  this._connection.onDisconnect = (err, code) => {\n    this._inPacketCount = 0;\n    this._serverInfo = null;\n    this._authenticated = false;\n\n    if (this._expirePromises) {\n      clearInterval(this._expirePromises);\n      this._expirePromises = null;\n    }\n\n    // Mark all topics as unsubscribed\n    cacheMap((obj, key) => {\n      if (key.lastIndexOf('topic:', 0) === 0) {\n        obj._resetSub();\n      }\n    });\n\n    // Reject all pending promises\n    for (let key in this._pendingPromises) {\n      let callbacks = this._pendingPromises[key];\n      if (callbacks && callbacks.reject) {\n        callbacks.reject(err);\n      }\n    }\n    this._pendingPromises = {};\n\n    if (this.onDisconnect) {\n      this.onDisconnect(err);\n    }\n  }\n};\n\n// Static methods.\n\n/**\n * Helper method to package account credential.\n * @memberof Tinode\n * @static\n *\n * @param {String|Object} meth - validation method or object with validation data.\n * @param {String=} val - validation value (e.g. email or phone number).\n * @param {Object=} params - validation parameters.\n * @param {String=} resp - validation response.\n *\n * @returns {Array} array with a single credentail or null if no valid credentials were given.\n */\nTinode.credential = function(meth, val, params, resp) {\n  if (typeof meth == 'object') {\n    ({\n      val,\n      params,\n      resp,\n      meth\n    } = meth);\n  }\n  if (meth && (val || resp)) {\n    return [{\n      'meth': meth,\n      'val': val,\n      'resp': resp,\n      'params': params\n    }];\n  }\n  return null;\n};\n\n/**\n * Determine topic type from topic's name: grp, p2p, me, fnd.\n * @memberof Tinode\n * @static\n *\n * @param {string} name - Name of the topic to test.\n * @returns {string} One of <tt>'me'</tt>, <tt>'grp'</tt>, <tt>'p2p'</tt> or <tt>undefined</tt>.\n */\nTinode.topicType = function(name) {\n  const types = {\n    'me': 'me',\n    'fnd': 'fnd',\n    'grp': 'grp',\n    'new': 'grp',\n    'nch': 'grp',\n    'chn': 'grp',\n    'usr': 'p2p',\n    'sys': 'sys'\n  };\n  return types[(typeof name == 'string') ? name.substring(0, 3) : 'xxx'];\n};\n\n/**\n * Check if the given topic name is a name of a group topic.\n * @memberof Tinode\n * @static\n *\n * @param {string} name - Name of the topic to test.\n * @returns {boolean} true if the name is a name of a group topic, false otherwise.\n */\nTinode.isGroupTopicName = function(name) {\n  return Tinode.topicType(name) === 'grp';\n};\n\n/**\n * Check if the given topic name is a name of a p2p topic.\n * @memberof Tinode\n * @static\n *\n * @param {string} name - Name of the topic to test.\n * @returns {boolean} true if the name is a name of a p2p topic, false otherwise.\n */\nTinode.isP2PTopicName = function(name) {\n  return Tinode.topicType(name) === 'p2p';\n};\n\n/**\n * Check if the topic name is a name of a new topic.\n * @memberof Tinode\n * @static\n *\n * @param {string} name - topic name to check.\n * @returns {boolean} true if the name is a name of a new topic.\n */\nTinode.isNewGroupTopicName = function(name) {\n  return (typeof name == 'string') &&\n    (name.substring(0, 3) == TOPIC_NEW || name.substring(0, 3) == TOPIC_NEW_CHAN);\n};\n\n/**\n * Check if the topic name is a name of a channel.\n * @memberof Tinode\n * @static\n *\n * @param {string} name - topic name to check.\n * @returns {boolean} true if the name is a name of a channel.\n */\nTinode.isChannelTopicName = function(name) {\n  return (typeof name == 'string') &&\n    (name.substring(0, 3) == TOPIC_CHAN || name.substring(0, 3) == TOPIC_NEW_CHAN);\n};\n\n/**\n * Return information about the current version of this Tinode client library.\n * @memberof Tinode\n * @static\n *\n * @returns {string} semantic version of the library, e.g. '0.15.5-rc1'.\n */\nTinode.getVersion = function() {\n  return VERSION;\n};\n\n/**\n * To use Tinode in a non browser context, supply WebSocket and XMLHttpRequest providers.\n * @static\n * @memberof Tinode\n * @param wsProvider WebSocket provider, e.g. for nodeJS require('ws').\n * @param xhrProvider XMLHttpRequest provider, e.g. for node require('xhr').\n */\nTinode.setNetworkProviders = function(wsProvider, xhrProvider) {\n  WebSocketProvider = wsProvider;\n  XHRProvider = xhrProvider;\n};\n\n/**\n * Return information about the current name and version of this Tinode library.\n * @memberof Tinode\n * @static\n *\n * @returns {string} the name of the library and it's version.\n */\nTinode.getLibrary = function() {\n  return LIBRARY;\n};\n\n// Exported constants\nTinode.MESSAGE_STATUS_NONE = MESSAGE_STATUS_NONE;\nTinode.MESSAGE_STATUS_QUEUED = MESSAGE_STATUS_QUEUED;\nTinode.MESSAGE_STATUS_SENDING = MESSAGE_STATUS_SENDING;\nTinode.MESSAGE_STATUS_FAILED = MESSAGE_STATUS_FAILED;\nTinode.MESSAGE_STATUS_SENT = MESSAGE_STATUS_SENT;\nTinode.MESSAGE_STATUS_RECEIVED = MESSAGE_STATUS_RECEIVED;\nTinode.MESSAGE_STATUS_READ = MESSAGE_STATUS_READ;\nTinode.MESSAGE_STATUS_TO_ME = MESSAGE_STATUS_TO_ME;\n\n// Unicode [del] symbol.\nTinode.DEL_CHAR = '\\u2421';\n\n/**\n * Check if the given string represents NULL value as defined by Tinode ('\\u2421').\n * @memberof Tinode\n * @static\n *\n * @param {String} str - string to check for null value.\n *\n * @returns {boolean} true if string represents NULL value, false otherwise.\n */\nTinode.isNullValue = function(str) {\n  return str === Tinode.DEL_CHAR;\n};\n\n/**\n * Check if the given URL string is a relative URL.\n * Check for cases like:\n *  'http://example.com'\n *  ' http://example.com'\n *  '//example.com/'\n *  'http:example.com'\n *  'http:/example.com'\n * @memberof Tinode\n * @static\n *\n * @param {String} url - URL string to check.\n *\n * @returns {boolean} true if the URL is relative, false otherwise.\n */\nTinode.isRelativeURL = function(url) {\n  return !/^\\s*([a-z][a-z0-9+.-]*:|\\/\\/)/im.test(url);\n};\n\n// Names of keys to server-provided configuration limits.\nTinode.MAX_MESSAGE_SIZE = 'maxMessageSize';\nTinode.MAX_SUBSCRIBER_COUNT = 'maxSubscriberCount';\nTinode.MAX_TAG_COUNT = 'maxTagCount';\nTinode.MAX_FILE_UPLOAD_SIZE = 'maxFileUploadSize';\n\n// Public methods;\nTinode.prototype = {\n  /**\n   * Connect to the server.\n   * @memberof Tinode#\n   *\n   * @param {String} host_ - name of the host to connect to.\n   *\n   * @return {Promise} Promise resolved/rejected when the connection call completes:\n   * <tt>resolve()</tt> is called without parameters, <tt>reject()</tt> receives the <tt>Error</tt> as a single parameter.\n   */\n  connect: function(host_) {\n    return this._connection.connect(host_);\n  },\n\n  /**\n   * Attempt to reconnect to the server immediately.\n   * @memberof Tinode#\n   *\n   * @param {String} force - reconnect even if there is a connection already.\n   */\n  reconnect: function(force) {\n    this._connection.reconnect(force);\n  },\n\n  /**\n   * Disconnect from the server.\n   * @memberof Tinode#\n   */\n  disconnect: function() {\n    this._connection.disconnect();\n  },\n\n  /**\n   * Send a network probe message to make sure the connection is alive.\n   * @memberof Tinode#\n   */\n  networkProbe: function() {\n    this._connection.probe();\n  },\n\n  /**\n   * Check for live connection to server.\n   * @memberof Tinode#\n   *\n   * @returns {Boolean} true if there is a live connection, false otherwise.\n   */\n  isConnected: function() {\n    return this._connection.isConnected();\n  },\n\n  /**\n   * Check if connection is authenticated (last login was successful).\n   * @memberof Tinode#\n   * @returns {boolean} true if authenticated, false otherwise.\n   */\n  isAuthenticated: function() {\n    return this._authenticated;\n  },\n\n  /**\n   * Add API key and auth token to the relative URL making it usable for getting data\n   * from the server in a simple GET request.\n   * @memberof Tinode#\n   *\n   * @param {String} URL to wrap.\n   * @returns {string} URL with appended API key and token, if valid token is present.\n   */\n  authorizeURL: function(url) {\n    if (!url) {\n      return url;\n    }\n\n    if (Tinode.isRelativeURL(url)) {\n      // Fake base to make the relative URL parseable.\n      const base = 'scheme://host/';\n      const parsed = new URL(url, base);\n      if (this._apiKey) {\n        parsed.searchParams.append('apikey', this._apiKey);\n      }\n      if (this._authToken.token) {\n        parsed.searchParams.append('auth', 'token');\n        parsed.searchParams.append('secret', this._authToken.token);\n      }\n      // Convert back to string and strip fake base URL except for the root slash.\n      url = parsed.toString().substring(base.length - 1);\n    }\n    return url;\n  },\n\n  /**\n   * @typedef AccountParams\n   * @memberof Tinode\n   * @type Object\n   * @property {Tinode.DefAcs=} defacs - Default access parameters for user's <tt>me</tt> topic.\n   * @property {Object=} public - Public application-defined data exposed on <tt>me</tt> topic.\n   * @property {Object=} private - Private application-defined data accessible on <tt>me</tt> topic.\n   * @property {Array} tags - array of string tags for user discovery.\n   * @property {string=} token - authentication token to use.\n   */\n  /**\n   * @typedef DefAcs\n   * @memberof Tinode\n   * @type Object\n   * @property {string=} auth - Access mode for <tt>me</tt> for authenticated users.\n   * @property {string=} anon - Access mode for <tt>me</tt>  anonymous users.\n   */\n\n  /**\n   * Create or update an account.\n   * @memberof Tinode#\n   *\n   * @param {String} uid - User id to update\n   * @param {String} scheme - Authentication scheme; <tt>\"basic\"</tt> and <tt>\"anonymous\"</tt> are the currently supported schemes.\n   * @param {String} secret - Authentication secret, assumed to be already base64 encoded.\n   * @param {Boolean=} login - Use new account to authenticate current session\n   * @param {Tinode.AccountParams=} params - User data to pass to the server.\n   */\n  account: function(uid, scheme, secret, login, params) {\n    const pkt = this.initPacket('acc');\n    pkt.acc.user = uid;\n    pkt.acc.scheme = scheme;\n    pkt.acc.secret = secret;\n    // Log in to the new account using selected scheme\n    pkt.acc.login = login;\n\n    if (params) {\n      pkt.acc.desc.defacs = params.defacs;\n      pkt.acc.desc.public = params.public;\n      pkt.acc.desc.private = params.private;\n\n      pkt.acc.tags = params.tags;\n      pkt.acc.cred = params.cred;\n\n      pkt.acc.token = params.token;\n    }\n\n    return this.send(pkt, pkt.acc.id);\n  },\n\n  /**\n   * Create a new user. Wrapper for {@link Tinode#account}.\n   * @memberof Tinode#\n   *\n   * @param {String} scheme - Authentication scheme; <tt>\"basic\"</tt> is the only currently supported scheme.\n   * @param {String} secret - Authentication.\n   * @param {Boolean=} login - Use new account to authenticate current session\n   * @param {Tinode.AccountParams=} params - User data to pass to the server.\n   *\n   * @returns {Promise} Promise which will be resolved/rejected when server reply is received.\n   */\n  createAccount: function(scheme, secret, login, params) {\n    let promise = this.account(USER_NEW, scheme, secret, login, params);\n    if (login) {\n      promise = promise.then((ctrl) => {\n        this.loginSuccessful(ctrl);\n        return ctrl;\n      });\n    }\n    return promise;\n  },\n\n  /**\n   * Create user with 'basic' authentication scheme and immediately\n   * use it for authentication. Wrapper for {@link Tinode#account}.\n   * @memberof Tinode#\n   *\n   * @param {string} username - Login to use for the new account.\n   * @param {string} password - User's password.\n   * @param {Tinode.AccountParams=} params - User data to pass to the server.\n   *\n   * @returns {Promise} Promise which will be resolved/rejected when server reply is received.\n   */\n  createAccountBasic: function(username, password, params) {\n    // Make sure we are not using 'null' or 'undefined';\n    username = username || '';\n    password = password || '';\n    return this.createAccount('basic',\n      b64EncodeUnicode(username + ':' + password), true, params);\n  },\n\n  /**\n   * Update user's credentials for 'basic' authentication scheme. Wrapper for {@link Tinode#account}.\n   * @memberof Tinode#\n   *\n   * @param {string} uid - User ID to update.\n   * @param {string} username - Login to use for the new account.\n   * @param {string} password - User's password.\n   * @param {Tinode.AccountParams=} params - data to pass to the server.\n   *\n   * @returns {Promise} Promise which will be resolved/rejected when server reply is received.\n   */\n  updateAccountBasic: function(uid, username, password, params) {\n    // Make sure we are not using 'null' or 'undefined';\n    username = username || '';\n    password = password || '';\n    return this.account(uid, 'basic',\n      b64EncodeUnicode(username + ':' + password), false, params);\n  },\n\n  /**\n   * Send handshake to the server.\n   * @memberof Tinode#\n   *\n   * @returns {Promise} Promise which will be resolved/rejected when server reply is received.\n   */\n  hello: function() {\n    const pkt = this.initPacket('hi');\n\n    return this.send(pkt, pkt.hi.id)\n      .then((ctrl) => {\n        // Reset backoff counter on successful connection.\n        this._connection.backoffReset();\n\n        // Server response contains server protocol version, build, constraints,\n        // session ID for long polling. Save them.\n        if (ctrl.params) {\n          this._serverInfo = ctrl.params;\n        }\n\n        if (this.onConnect) {\n          this.onConnect();\n        }\n\n        return ctrl;\n      }).catch((err) => {\n        this._connection.reconnect(true);\n\n        if (this.onDisconnect) {\n          this.onDisconnect(err);\n        }\n      });\n  },\n\n  /**\n   * Set or refresh the push notifications/device token. If the client is connected,\n   * the deviceToken can be sent to the server.\n   *\n   * @memberof Tinode#\n   * @param {string} dt - token obtained from the provider.\n   * @param {boolean} sendToServer - if true, send dt to server immediately.\n   *\n   * @returns true if attempt was made to send the token to the server.\n   */\n  setDeviceToken: function(dt, sendToServer) {\n    let sent = false;\n    if (dt && dt != this._deviceToken) {\n      this._deviceToken = dt;\n      if (sendToServer && this.isConnected() && this.isAuthenticated()) {\n        this.send({\n          'hi': {\n            'dev': dt\n          }\n        });\n        sent = true;\n      }\n    }\n    return sent;\n  },\n\n  /**\n   * Authenticate current session.\n   * @memberof Tinode#\n   *\n   * @param {String} scheme - Authentication scheme; <tt>\"basic\"</tt> is the only currently supported scheme.\n   * @param {String} secret - Authentication secret, assumed to be already base64 encoded.\n   *\n   * @returns {Promise} Promise which will be resolved/rejected when server reply is received.\n   */\n  login: function(scheme, secret, cred) {\n    const pkt = this.initPacket('login');\n    pkt.login.scheme = scheme;\n    pkt.login.secret = secret;\n    pkt.login.cred = cred;\n\n    return this.send(pkt, pkt.login.id)\n      .then((ctrl) => {\n        this.loginSuccessful(ctrl);\n        return ctrl;\n      });\n  },\n\n  /**\n   * Wrapper for {@link Tinode#login} with basic authentication\n   * @memberof Tinode#\n   *\n   * @param {String} uname - User name.\n   * @param {String} password  - Password.\n   * @returns {Promise} Promise which will be resolved/rejected on receiving server reply.\n   */\n  loginBasic: function(uname, password, cred) {\n    return this.login('basic', b64EncodeUnicode(uname + ':' + password), cred)\n      .then((ctrl) => {\n        this._login = uname;\n        return ctrl;\n      });\n  },\n\n  /**\n   * Wrapper for {@link Tinode#login} with token authentication\n   * @memberof Tinode#\n   *\n   * @param {String} token - Token received in response to earlier login.\n   * @returns {Promise} Promise which will be resolved/rejected on receiving server reply.\n   */\n  loginToken: function(token, cred) {\n    return this.login('token', token, cred);\n  },\n\n  /**\n   * Send a request for resetting an authentication secret.\n   * @memberof Tinode#\n   *\n   * @param {String} scheme - authentication scheme to reset.\n   * @param {String} method - method to use for resetting the secret, such as \"email\" or \"tel\".\n   * @param {String} value - value of the credential to use, a specific email address or a phone number.\n   *\n   * @returns {Promise} Promise which will be resolved/rejected on receiving the server reply.\n   */\n  requestResetAuthSecret: function(scheme, method, value) {\n    return this.login('reset', b64EncodeUnicode(scheme + ':' + method + ':' + value));\n  },\n\n  /**\n   * @typedef AuthToken\n   * @memberof Tinode\n   * @type Object\n   * @property {String} token - Token value.\n   * @property {Date} expires - Token expiration time.\n   */\n  /**\n   * Get stored authentication token.\n   * @memberof Tinode#\n   *\n   * @returns {Tinode.AuthToken} authentication token.\n   */\n  getAuthToken: function() {\n    if (this._authToken && (this._authToken.expires.getTime() > Date.now())) {\n      return this._authToken;\n    } else {\n      this._authToken = null;\n    }\n    return null;\n  },\n\n  /**\n   * Application may provide a saved authentication token.\n   * @memberof Tinode#\n   *\n   * @param {Tinode.AuthToken} token - authentication token.\n   */\n  setAuthToken: function(token) {\n    this._authToken = token;\n  },\n\n  /**\n   * @typedef SetParams\n   * @memberof Tinode\n   * @property {Tinode.SetDesc=} desc - Topic initialization parameters when creating a new topic or a new subscription.\n   * @property {Tinode.SetSub=} sub - Subscription initialization parameters.\n   */\n  /**\n   * @typedef SetDesc\n   * @memberof Tinode\n   * @property {Tinode.DefAcs=} defacs - Default access mode.\n   * @property {Object=} public - Free-form topic description, publically accessible.\n   * @property {Object=} private - Free-form topic descriptionaccessible only to the owner.\n   */\n  /**\n   * @typedef SetSub\n   * @memberof Tinode\n   * @property {String=} user - UID of the user affected by the request. Default (empty) - current user.\n   * @property {String=} mode - User access mode, either requested or assigned dependent on context.\n   * @property {Object=} info - Free-form payload to pass to the invited user or topic manager.\n   */\n  /**\n   * Parameters passed to {@link Tinode#subscribe}.\n   *\n   * @typedef SubscriptionParams\n   * @memberof Tinode\n   * @property {Tinode.SetParams=} set - Parameters used to initialize topic\n   * @property {Tinode.GetQuery=} get - Query for fetching data from topic.\n   */\n\n  /**\n   * Send a topic subscription request.\n   * @memberof Tinode#\n   *\n   * @param {String} topic - Name of the topic to subscribe to.\n   * @param {Tinode.GetQuery=} getParams - Optional subscription metadata query\n   * @param {Tinode.SetParams=} setParams - Optional initialization parameters\n   *\n   * @returns {Promise} Promise which will be resolved/rejected on receiving server reply.\n   */\n  subscribe: function(topicName, getParams, setParams) {\n    const pkt = this.initPacket('sub', topicName)\n    if (!topicName) {\n      topicName = TOPIC_NEW;\n    }\n\n    pkt.sub.get = getParams;\n\n    if (setParams) {\n      if (setParams.sub) {\n        pkt.sub.set.sub = setParams.sub;\n      }\n\n      if (setParams.desc) {\n        if (Tinode.isNewGroupTopicName(topicName)) {\n          // Full set.desc params are used for new topics only\n          pkt.sub.set.desc = setParams.desc;\n        } else if (Tinode.isP2PTopicName(topicName) && setParams.desc.defacs) {\n          // Use optional default permissions only.\n          pkt.sub.set.desc = {\n            defacs: setParams.desc.defacs\n          };\n        }\n      }\n\n      if (setParams.tags) {\n        pkt.sub.set.tags = setParams.tags;\n      }\n    }\n\n    return this.send(pkt, pkt.sub.id);\n  },\n\n  /**\n   * Detach and optionally unsubscribe from the topic\n   * @memberof Tinode#\n   *\n   * @param {String} topic - Topic to detach from.\n   * @param {Boolean} unsub - If <tt>true</tt>, detach and unsubscribe, otherwise just detach.\n   *\n   * @returns {Promise} Promise which will be resolved/rejected on receiving server reply.\n   */\n  leave: function(topic, unsub) {\n    const pkt = this.initPacket('leave', topic);\n    pkt.leave.unsub = unsub;\n\n    return this.send(pkt, pkt.leave.id);\n  },\n\n  /**\n   * Create message draft without sending it to the server.\n   * @memberof Tinode#\n   *\n   * @param {String} topic - Name of the topic to publish to.\n   * @param {Object} data - Payload to publish.\n   * @param {Boolean=} noEcho - If <tt>true</tt>, tell the server not to echo the message to the original session.\n   *\n   * @returns {Object} new message which can be sent to the server or otherwise used.\n   */\n  createMessage: function(topic, data, noEcho) {\n    const pkt = this.initPacket('pub', topic);\n\n    let dft = typeof data == 'string' ? Drafty.parse(data) : data;\n    if (dft && !Drafty.isPlainText(dft)) {\n      pkt.pub.head = {\n        mime: Drafty.getContentType()\n      };\n      data = dft;\n    }\n    pkt.pub.noecho = noEcho;\n    pkt.pub.content = data;\n\n    return pkt.pub;\n  },\n\n  /**\n   * Publish {data} message to topic.\n   * @memberof Tinode#\n   *\n   * @param {String} topic - Name of the topic to publish to.\n   * @param {Object} data - Payload to publish.\n   * @param {Boolean=} noEcho - If <tt>true</tt>, tell the server not to echo the message to the original session.\n   *\n   * @returns {Promise} Promise which will be resolved/rejected on receiving server reply.\n   */\n  publish: function(topic, data, noEcho) {\n    return this.publishMessage(\n      this.createMessage(topic, data, noEcho)\n    );\n  },\n\n  /**\n   * Publish message to topic. The message should be created by {@link Tinode#createMessage}.\n   * @memberof Tinode#\n   *\n   * @param {Object} pub - Message to publish.\n   *\n   * @returns {Promise} Promise which will be resolved/rejected on receiving server reply.\n   */\n  publishMessage: function(pub) {\n    // Make a shallow copy. Needed in order to clear locally-assigned temp values;\n    pub = Object.assign({}, pub);\n    pub.seq = undefined;\n    pub.from = undefined;\n    pub.ts = undefined;\n    return this.send({\n      pub: pub\n    }, pub.id);\n  },\n\n  /**\n   * @typedef GetQuery\n   * @type Object\n   * @memberof Tinode\n   * @property {Tinode.GetOptsType=} desc - If provided (even if empty), fetch topic description.\n   * @property {Tinode.GetOptsType=} sub - If provided (even if empty), fetch topic subscriptions.\n   * @property {Tinode.GetDataType=} data - If provided (even if empty), get messages.\n   */\n\n  /**\n   * @typedef GetOptsType\n   * @type Object\n   * @memberof Tinode\n   * @property {Date=} ims - \"If modified since\", fetch data only it was was modified since stated date.\n   * @property {Number=} limit - Maximum number of results to return. Ignored when querying topic description.\n   */\n\n  /**\n   * @typedef GetDataType\n   * @type Object\n   * @memberof Tinode\n   * @property {Number=} since - Load messages with seq id equal or greater than this value.\n   * @property {Number=} before - Load messages with seq id lower than this number.\n   * @property {Number=} limit - Maximum number of results to return.\n   */\n\n  /**\n   * Request topic metadata\n   * @memberof Tinode#\n   *\n   * @param {String} topic - Name of the topic to query.\n   * @param {Tinode.GetQuery} params - Parameters of the query. Use {Tinode.MetaGetBuilder} to generate.\n   *\n   * @returns {Promise} Promise which will be resolved/rejected on receiving server reply.\n   */\n  getMeta: function(topic, params) {\n    const pkt = this.initPacket('get', topic);\n\n    pkt.get = mergeObj(pkt.get, params);\n\n    return this.send(pkt, pkt.get.id);\n  },\n\n  /**\n   * Update topic's metadata: description, subscribtions.\n   * @memberof Tinode#\n   *\n   * @param {String} topic - Topic to update.\n   * @param {Tinode.SetParams} params - topic metadata to update.\n   * @returns {Promise} Promise which will be resolved/rejected on receiving server reply.\n   */\n  setMeta: function(topic, params) {\n    const pkt = this.initPacket('set', topic);\n    const what = [];\n\n    if (params) {\n      ['desc', 'sub', 'tags', 'cred'].map(function(key) {\n        if (params.hasOwnProperty(key)) {\n          what.push(key);\n          pkt.set[key] = params[key];\n        }\n      });\n    }\n\n    if (what.length == 0) {\n      return Promise.reject(new Error(\"Invalid {set} parameters\"));\n    }\n\n    return this.send(pkt, pkt.set.id);\n  },\n\n  /**\n   * Range of message IDs to delete.\n   *\n   * @typedef DelRange\n   * @type Object\n   * @memberof Tinode\n   * @property {Number} low - low end of the range, inclusive (closed).\n   * @property {Number=} hi - high end of the range, exclusive (open).\n   */\n  /**\n   * Delete some or all messages in a topic.\n   * @memberof Tinode#\n   *\n   * @param {String} topic - Topic name to delete messages from.\n   * @param {Tinode.DelRange[]} list - Ranges of message IDs to delete.\n   * @param {Boolean=} hard - Hard or soft delete\n   *\n   * @returns {Promise} Promise which will be resolved/rejected on receiving server reply.\n   */\n  delMessages: function(topic, ranges, hard) {\n    const pkt = this.initPacket('del', topic);\n\n    pkt.del.what = 'msg';\n    pkt.del.delseq = ranges;\n    pkt.del.hard = hard;\n\n    return this.send(pkt, pkt.del.id);\n  },\n\n  /**\n   * Delete the topic alltogether. Requires Owner permission.\n   * @memberof Tinode#\n   *\n   * @param {String} topic - Name of the topic to delete\n   * @param {Boolean} hard - hard-delete topic.\n   * @returns {Promise} Promise which will be resolved/rejected on receiving server reply.\n   */\n  delTopic: function(topic, hard) {\n    const pkt = this.initPacket('del', topic);\n    pkt.del.what = 'topic';\n    pkt.del.hard = hard;\n\n    return this.send(pkt, pkt.del.id).then((ctrl) => {\n      this.cacheDel('topic', topic);\n      return this.ctrl;\n    });\n  },\n\n  /**\n   * Delete subscription. Requires Share permission.\n   * @memberof Tinode#\n   *\n   * @param {String} topic - Name of the topic to delete\n   * @param {String} user - User ID to remove.\n   * @returns {Promise} Promise which will be resolved/rejected on receiving server reply.\n   */\n  delSubscription: function(topic, user) {\n    const pkt = this.initPacket('del', topic);\n    pkt.del.what = 'sub';\n    pkt.del.user = user;\n\n    return this.send(pkt, pkt.del.id);\n  },\n\n  /**\n   * Delete credential. Always sent on 'me' topic.\n   * @memberof Tinode#\n   *\n   * @param {String} method - validation method such as 'email' or 'tel'.\n   * @param {String} value - validation value, i.e. 'alice@example.com'.\n   * @returns {Promise} Promise which will be resolved/rejected on receiving server reply.\n   */\n  delCredential: function(method, value) {\n    const pkt = this.initPacket('del', TOPIC_ME);\n    pkt.del.what = 'cred';\n    pkt.del.cred = {\n      meth: method,\n      val: value\n    };\n\n    return this.send(pkt, pkt.del.id);\n  },\n\n  /**\n   * Request to delete account of the current user.\n   * @memberof Tinode#\n   *\n   * @param {Boolean} hard - hard-delete user.\n   * @returns {Promise} Promise which will be resolved/rejected on receiving server reply.\n   */\n  delCurrentUser: function(hard) {\n    const pkt = this.initPacket('del', null);\n    pkt.del.what = 'user';\n    pkt.del.hard = hard;\n\n    return this.send(pkt, pkt.del.id).then((ctrl) => {\n      this._myUID = null;\n    });\n  },\n\n  /**\n   * Notify server that a message or messages were read or received. Does NOT return promise.\n   * @memberof Tinode#\n   *\n   * @param {String} topic - Name of the topic where the mesage is being aknowledged.\n   * @param {String} what - Action being aknowledged, either \"read\" or \"recv\".\n   * @param {Number} seq - Maximum id of the message being acknowledged.\n   */\n  note: function(topic, what, seq) {\n    if (seq <= 0 || seq >= LOCAL_SEQID) {\n      throw new Error(\"Invalid message id \" + seq);\n    }\n\n    const pkt = this.initPacket('note', topic);\n    pkt.note.what = what;\n    pkt.note.seq = seq;\n    this.send(pkt);\n  },\n\n  /**\n   * Broadcast a key-press notification to topic subscribers. Used to show\n   * typing notifications \"user X is typing...\".\n   * @memberof Tinode#\n   *\n   * @param {String} topic - Name of the topic to broadcast to.\n   */\n  noteKeyPress: function(topic) {\n    const pkt = this.initPacket('note', topic);\n    pkt.note.what = 'kp';\n    this.send(pkt);\n  },\n\n  /**\n   * Get a named topic, either pull it from cache or create a new instance.\n   * There is a single instance of topic for each name.\n   * @memberof Tinode#\n   *\n   * @param {String} name - Name of the topic to get.\n   * @returns {Tinode.Topic} Requested or newly created topic or <tt>undefined</tt> if topic name is invalid.\n   */\n  getTopic: function(name) {\n    let topic = this.cacheGet('topic', name);\n    if (!topic && name) {\n      if (name == TOPIC_ME) {\n        topic = new TopicMe();\n      } else if (name == TOPIC_FND) {\n        topic = new TopicFnd();\n      } else {\n        topic = new Topic(name);\n      }\n      // topic._new = false;\n      this.cachePut('topic', name, topic);\n      this.attachCacheToTopic(topic);\n    }\n    return topic;\n  },\n\n  /**\n   * Check if named topic is already present in cache.\n   * @memberof Tinode#\n   *\n   * @param {String} name - Name of the topic to check.\n   * @returns {Boolean} true if topic is found in cache, false oterwise.\n   */\n  isTopicCached: function(name) {\n    return !!this.cacheGet('topic', name);\n  },\n\n  /**\n   * Instantiate a new group topic. An actual name will be assigned by the server\n   * on {@link Tinode.Topic.subscribe}.\n   * @memberof Tinode#\n   *\n   * @param {Tinode.Callbacks} callbacks - Object with callbacks for various events.\n   * @returns {Tinode.Topic} Newly created topic.\n   */\n  newTopic: function(callbacks) {\n    const topic = new Topic(TOPIC_NEW, callbacks);\n    this.attachCacheToTopic(topic);\n    return topic;\n  },\n\n  /**\n   * Instantiate a new channel-enabled group topic. An actual name will be assigned by the server\n   * on {@link Tinode.Topic.subscribe}.\n   * @memberof Tinode#\n   *\n   * @param {Tinode.Callbacks} callbacks - Object with callbacks for various events.\n   * @returns {Tinode.Topic} Newly created topic.\n   */\n  newChannel: function(callbacks) {\n    const topic = new Topic(TOPIC_NEW_CHAN, callbacks);\n    this.attachCacheToTopic(topic);\n    return topic;\n  },\n\n  /**\n   * Generate unique name like 'new123456' suitable for creating a new group topic.\n   * @memberof Tinode#\n   *\n   * @param {Boolean} isChan - if the topic is channel-enabled.\n   * @returns {string} name which can be used for creating a new group topic.\n   */\n  newGroupTopicName: function(isChan) {\n    return (isChan ? TOPIC_NEW_CHAN : TOPIC_NEW) + this.getNextUniqueId();\n  },\n\n  /**\n   * Instantiate a new P2P topic with a given peer.\n   * @memberof Tinode#\n   *\n   * @param {string} peer - UID of the peer to start topic with.\n   * @param {Tinode.Callbacks} callbacks - Object with callbacks for various events.\n   * @returns {Tinode.Topic} Newly created topic.\n   */\n  newTopicWith: function(peer, callbacks) {\n    const topic = new Topic(peer, callbacks);\n    this.attachCacheToTopic(topic);\n    return topic;\n  },\n\n  /**\n   * Instantiate 'me' topic or get it from cache.\n   * @memberof Tinode#\n   *\n   * @returns {Tinode.TopicMe} Instance of 'me' topic.\n   */\n  getMeTopic: function() {\n    return this.getTopic(TOPIC_ME);\n  },\n\n  /**\n   * Instantiate 'fnd' (find) topic or get it from cache.\n   * @memberof Tinode#\n   *\n   * @returns {Tinode.Topic} Instance of 'fnd' topic.\n   */\n  getFndTopic: function() {\n    return this.getTopic(TOPIC_FND);\n  },\n\n  /**\n   * Create a new LargeFileHelper instance\n   * @memberof Tinode#\n   *\n   * @returns {Tinode.LargeFileHelper} instance of a LargeFileHelper.\n   */\n  getLargeFileHelper: function() {\n    return new LargeFileHelper(this);\n  },\n\n  /**\n   * Get the UID of the the current authenticated user.\n   * @memberof Tinode#\n   * @returns {string} UID of the current user or <tt>undefined</tt> if the session is not yet authenticated or if there is no session.\n   */\n  getCurrentUserID: function() {\n    return this._myUID;\n  },\n\n  /**\n   * Check if the given user ID is equal to the current user's UID.\n   * @memberof Tinode#\n   * @param {string} uid - UID to check.\n   * @returns {boolean} true if the given UID belongs to the current logged in user.\n   */\n  isMe: function(uid) {\n    return this._myUID === uid;\n  },\n\n  /**\n   * Get login used for last successful authentication.\n   * @memberof Tinode#\n   * @returns {string} login last used successfully or <tt>undefined</tt>.\n   */\n  getCurrentLogin: function() {\n    return this._login;\n  },\n\n  /**\n   * Return information about the server: protocol version and build timestamp.\n   * @memberof Tinode#\n   * @returns {Object} build and version of the server or <tt>null</tt> if there is no connection or if the first server response has not been received yet.\n   */\n  getServerInfo: function() {\n    return this._serverInfo;\n  },\n\n  /**\n   * Return server-provided configuration value (long integer).\n   * @memberof Tinode#\n   * @param {String} name of the value to return\n   * @param {Object} defaultValue to return in case server limit is not set or not found.\n   * @returns {integer} named value.\n   */\n  getServerLimit: function(name, defaultValue) {\n    return (this._serverInfo ? this._serverInfo[name] : null) || defaultValue;\n  },\n\n  /**\n   * Toggle console logging. Logging is off by default.\n   * @memberof Tinode#\n   * @param {boolean} enabled - Set to <tt>true</tt> to enable logging to console.\n   * @param {boolean} trimLongStrings - Set to <tt>true</tt> to trim long strings.\n   */\n  enableLogging: function(enabled, trimLongStrings) {\n    this._loggingEnabled = enabled;\n    this._trimLongStrings = enabled && trimLongStrings;\n  },\n\n  /**\n   * Set UI language to report to the server. Must be called before 'hi' is sent, otherwise it will not be used.\n   * @memberof Tinode#\n   *\n   * @param {String} hl - human (UI) language, like \"en_US\" or \"zh-Hans\".\n   */\n  setHumanLanguage: function(hl) {\n    if (hl) {\n      this._humanLanguage = hl;\n    }\n  },\n\n  /**\n   * Check if given topic is online.\n   * @memberof Tinode#\n   *\n   * @param {String} name of the topic to test.\n   * @returns {Boolean} true if topic is online, false otherwise.\n   */\n  isTopicOnline: function(name) {\n    const me = this.getMeTopic();\n    const cont = me && me.getContact(name);\n    return cont && cont.online;\n  },\n\n  /**\n   * Get access mode for the given contact.\n   * @memberof Tinode#\n   *\n   * @param {String} name of the topic to query.\n   * @returns {AccessMode} access mode if topic is found, null otherwise.\n   */\n  getTopicAccessMode: function(name) {\n    const me = this.getMeTopic();\n    const cont = me && me.getContact(name);\n    return cont ? cont.acs : null;\n  },\n\n  /**\n   * Include message ID into all subsequest messages to server instructin it to send aknowledgemens.\n   * Required for promises to function. Default is \"on\".\n   * @memberof Tinode#\n   *\n   * @param {Boolean} status - Turn aknowledgemens on or off.\n   * @deprecated\n   */\n  wantAkn: function(status) {\n    if (status) {\n      this._messageId = Math.floor((Math.random() * 0xFFFFFF) + 0xFFFFFF);\n    } else {\n      this._messageId = 0;\n    }\n  },\n\n  // Callbacks:\n  /**\n   * Callback to report when the websocket is opened. The callback has no parameters.\n   * @memberof Tinode#\n   * @type {Tinode.onWebsocketOpen}\n   */\n  onWebsocketOpen: undefined,\n\n  /**\n   * @typedef Tinode.ServerParams\n   * @memberof Tinode\n   * @type Object\n   * @property {string} ver - Server version\n   * @property {string} build - Server build\n   * @property {string=} sid - Session ID, long polling connections only.\n   */\n\n  /**\n   * @callback Tinode.onConnect\n   * @param {number} code - Result code\n   * @param {string} text - Text epxplaining the completion, i.e \"OK\" or an error message.\n   * @param {Tinode.ServerParams} params - Parameters returned by the server.\n   */\n  /**\n   * Callback to report when connection with Tinode server is established.\n   * @memberof Tinode#\n   * @type {Tinode.onConnect}\n   */\n  onConnect: undefined,\n\n  /**\n   * Callback to report when connection is lost. The callback has no parameters.\n   * @memberof Tinode#\n   * @type {Tinode.onDisconnect}\n   */\n  onDisconnect: undefined,\n\n  /**\n   * @callback Tinode.onLogin\n   * @param {number} code - NUmeric completion code, same as HTTP status codes.\n   * @param {string} text - Explanation of the completion code.\n   */\n  /**\n   * Callback to report login completion.\n   * @memberof Tinode#\n   * @type {Tinode.onLogin}\n   */\n  onLogin: undefined,\n\n  /**\n   * Callback to receive {ctrl} (control) messages.\n   * @memberof Tinode#\n   * @type {Tinode.onCtrlMessage}\n   */\n  onCtrlMessage: undefined,\n\n  /**\n   * Callback to recieve {data} (content) messages.\n   * @memberof Tinode#\n   * @type {Tinode.onDataMessage}\n   */\n  onDataMessage: undefined,\n\n  /**\n   * Callback to receive {pres} (presence) messages.\n   * @memberof Tinode#\n   * @type {Tinode.onPresMessage}\n   */\n  onPresMessage: undefined,\n\n  /**\n   * Callback to receive all messages as objects.\n   * @memberof Tinode#\n   * @type {Tinode.onMessage}\n   */\n  onMessage: undefined,\n\n  /**\n   * Callback to receive all messages as unparsed text.\n   * @memberof Tinode#\n   * @type {Tinode.onRawMessage}\n   */\n  onRawMessage: undefined,\n\n  /**\n   * Callback to receive server responses to network probes. See {@link Tinode#networkProbe}\n   * @memberof Tinode#\n   * @type {Tinode.onNetworkProbe}\n   */\n  onNetworkProbe: undefined,\n\n  /**\n   * Callback to be notified when exponential backoff is iterating.\n   * @memberof Tinode#\n   * @type {Tinode.onAutoreconnectIteration}\n   */\n  onAutoreconnectIteration: undefined,\n};\n\n/**\n * Helper class for constructing {@link Tinode.GetQuery}.\n *\n * @class MetaGetBuilder\n * @memberof Tinode\n *\n * @param {Tinode.Topic} parent topic which instantiated this builder.\n */\nvar MetaGetBuilder = function(parent) {\n  this.topic = parent;\n  const me = parent._tinode.getMeTopic();\n  this.contact = me && me.getContact(parent.name);\n  this.what = {};\n}\n\nMetaGetBuilder.prototype = {\n\n  // Get latest timestamp\n  _get_ims: function() {\n    const cupd = this.contact && this.contact.updated;\n    const tupd = this.topic._lastDescUpdate || 0;\n    return cupd > tupd ? cupd : tupd;\n  },\n\n  /**\n   * Add query parameters to fetch messages within explicit limits.\n   * @memberof Tinode.MetaGetBuilder#\n   *\n   * @param {Number=} since messages newer than this (inclusive);\n   * @param {Number=} before older than this (exclusive)\n   * @param {Number=} limit number of messages to fetch\n   * @returns {Tinode.MetaGetBuilder} <tt>this</tt> object.\n   */\n  withData: function(since, before, limit) {\n    this.what['data'] = {\n      since: since,\n      before: before,\n      limit: limit\n    };\n    return this;\n  },\n\n  /**\n   * Add query parameters to fetch messages newer than the latest saved message.\n   * @memberof Tinode.MetaGetBuilder#\n   *\n   * @param {Number=} limit number of messages to fetch\n   *\n   * @returns {Tinode.MetaGetBuilder} <tt>this</tt> object.\n   */\n  withLaterData: function(limit) {\n    return this.withData(this.topic._maxSeq > 0 ? this.topic._maxSeq + 1 : undefined, undefined, limit);\n  },\n\n  /**\n   * Add query parameters to fetch messages older than the earliest saved message.\n   * @memberof Tinode.MetaGetBuilder#\n   *\n   * @param {Number=} limit maximum number of messages to fetch.\n   *\n   * @returns {Tinode.MetaGetBuilder} <tt>this</tt> object.\n   */\n  withEarlierData: function(limit) {\n    return this.withData(undefined, this.topic._minSeq > 0 ? this.topic._minSeq : undefined, limit);\n  },\n\n  /**\n   * Add query parameters to fetch topic description if it's newer than the given timestamp.\n   * @memberof Tinode.MetaGetBuilder#\n   *\n   * @param {Date=} ims fetch messages newer than this timestamp.\n   *\n   * @returns {Tinode.MetaGetBuilder} <tt>this</tt> object.\n   */\n  withDesc: function(ims) {\n    this.what['desc'] = {\n      ims: ims\n    };\n    return this;\n  },\n\n  /**\n   * Add query parameters to fetch topic description if it's newer than the last update.\n   * @memberof Tinode.MetaGetBuilder#\n   *\n   * @returns {Tinode.MetaGetBuilder} <tt>this</tt> object.\n   */\n  withLaterDesc: function() {\n    return this.withDesc(this._get_ims());\n  },\n\n  /**\n   * Add query parameters to fetch subscriptions.\n   * @memberof Tinode.MetaGetBuilder#\n   *\n   * @param {Date=} ims fetch subscriptions modified more recently than this timestamp\n   * @param {Number=} limit maximum number of subscriptions to fetch.\n   * @param {String=} userOrTopic user ID or topic name to fetch for fetching one subscription.\n   *\n   * @returns {Tinode.MetaGetBuilder} <tt>this</tt> object.\n   */\n  withSub: function(ims, limit, userOrTopic) {\n    const opts = {\n      ims: ims,\n      limit: limit\n    };\n    if (this.topic.getType() == 'me') {\n      opts.topic = userOrTopic;\n    } else {\n      opts.user = userOrTopic;\n    }\n    this.what['sub'] = opts;\n    return this;\n  },\n\n  /**\n   * Add query parameters to fetch a single subscription.\n   * @memberof Tinode.MetaGetBuilder#\n   *\n   * @param {Date=} ims fetch subscriptions modified more recently than this timestamp\n   * @param {String=} userOrTopic user ID or topic name to fetch for fetching one subscription.\n   *\n   * @returns {Tinode.MetaGetBuilder} <tt>this</tt> object.\n   */\n  withOneSub: function(ims, userOrTopic) {\n    return this.withSub(ims, undefined, userOrTopic);\n  },\n\n  /**\n   * Add query parameters to fetch a single subscription if it's been updated since the last update.\n   * @memberof Tinode.MetaGetBuilder#\n   *\n   * @param {String=} userOrTopic user ID or topic name to fetch for fetching one subscription.\n   *\n   * @returns {Tinode.MetaGetBuilder} <tt>this</tt> object.\n   */\n  withLaterOneSub: function(userOrTopic) {\n    return this.withOneSub(this.topic._lastSubsUpdate, userOrTopic);\n  },\n\n  /**\n   * Add query parameters to fetch subscriptions updated since the last update.\n   * @memberof Tinode.MetaGetBuilder#\n   *\n   * @param {Number=} limit maximum number of subscriptions to fetch.\n   *\n   * @returns {Tinode.MetaGetBuilder} <tt>this</tt> object.\n   */\n  withLaterSub: function(limit) {\n    return this.withSub(this.topic.isP2P() ?\n      this._get_ims() : this.topic._lastSubsUpdate,\n      limit);\n  },\n\n  /**\n   * Add query parameters to fetch topic tags.\n   * @memberof Tinode.MetaGetBuilder#\n   *\n   * @returns {Tinode.MetaGetBuilder} <tt>this</tt> object.\n   */\n  withTags: function() {\n    this.what['tags'] = true;\n    return this;\n  },\n\n  /**\n   * Add query parameters to fetch user's credentials. 'me' topic only.\n   * @memberof Tinode.MetaGetBuilder#\n   *\n   * @returns {Tinode.MetaGetBuilder} <tt>this</tt> object.\n   */\n  withCred: function() {\n    if (this.topic.getType() == 'me') {\n      this.what['cred'] = true;\n    } else {\n      this.topic._tinode.logger(\"ERROR: Invalid topic type for MetaGetBuilder:withCreds\", this.topic.getType());\n    }\n    return this;\n  },\n\n  /**\n   * Add query parameters to fetch deleted messages within explicit limits. Any/all parameters can be null.\n   * @memberof Tinode.MetaGetBuilder#\n   *\n   * @param {Number=} since ids of messages deleted since this 'del' id (inclusive)\n   * @param {Number=} limit number of deleted message ids to fetch\n   *\n   * @returns {Tinode.MetaGetBuilder} <tt>this</tt> object.\n   */\n  withDel: function(since, limit) {\n    if (since || limit) {\n      this.what['del'] = {\n        since: since,\n        limit: limit\n      };\n    }\n    return this;\n  },\n\n  /**\n   * Add query parameters to fetch messages deleted after the saved 'del' id.\n   * @memberof Tinode.MetaGetBuilder#\n   *\n   * @param {Number=} limit number of deleted message ids to fetch\n   *\n   * @returns {Tinode.MetaGetBuilder} <tt>this</tt> object.\n   */\n  withLaterDel: function(limit) {\n    // Specify 'since' only if we have already received some messages. If\n    // we have no locally cached messages then we don't care if any messages were deleted.\n    return this.withDel(this.topic._maxSeq > 0 ? this.topic._maxDel + 1 : undefined, limit);\n  },\n\n  /**\n   * Construct parameters\n   * @memberof Tinode.MetaGetBuilder#\n   *\n   * @returns {Tinode.GetQuery} Get query\n   */\n  build: function() {\n    const what = [];\n    const instance = this;\n    let params = {};\n    ['data', 'sub', 'desc', 'tags', 'cred', 'del'].map(function(key) {\n      if (instance.what.hasOwnProperty(key)) {\n        what.push(key);\n        if (Object.getOwnPropertyNames(instance.what[key]).length > 0) {\n          params[key] = instance.what[key];\n        }\n      }\n    });\n    if (what.length > 0) {\n      params.what = what.join(' ');\n    } else {\n      params = undefined;\n    }\n    return params;\n  }\n};\n\n/**\n * Helper class for handling access mode.\n *\n * @class AccessMode\n * @memberof Tinode\n *\n * @param {AccessMode|Object=} acs AccessMode to copy or access mode object received from the server.\n */\nvar AccessMode = function(acs) {\n  if (acs) {\n    this.given = typeof acs.given == 'number' ? acs.given : AccessMode.decode(acs.given);\n    this.want = typeof acs.want == 'number' ? acs.want : AccessMode.decode(acs.want);\n    this.mode = acs.mode ? (typeof acs.mode == 'number' ? acs.mode : AccessMode.decode(acs.mode)) :\n      (this.given & this.want);\n  }\n};\n\nAccessMode._NONE = 0x00;\nAccessMode._JOIN = 0x01;\nAccessMode._READ = 0x02;\nAccessMode._WRITE = 0x04;\nAccessMode._PRES = 0x08;\nAccessMode._APPROVE = 0x10;\nAccessMode._SHARE = 0x20;\nAccessMode._DELETE = 0x40;\nAccessMode._OWNER = 0x80;\n\nAccessMode._BITMASK = AccessMode._JOIN | AccessMode._READ | AccessMode._WRITE | AccessMode._PRES |\n  AccessMode._APPROVE | AccessMode._SHARE | AccessMode._DELETE | AccessMode._OWNER;\nAccessMode._INVALID = 0x100000;\n\nAccessMode._checkFlag = function(val, side, flag) {\n  side = side || 'mode';\n  if (['given', 'want', 'mode'].includes(side)) {\n    return ((val[side] & flag) != 0);\n  }\n  throw new Error(\"Invalid AccessMode component '\" + side + \"'\");\n}\n\n/**\n * Parse string into an access mode value.\n * @memberof Tinode.AccessMode\n * @static\n *\n * @param {string | number} mode - either a String representation of the access mode to parse or a set of bits to assign.\n * @returns {number} - Access mode as a numeric value.\n */\nAccessMode.decode = function(str) {\n  if (!str) {\n    return null;\n  } else if (typeof str == 'number') {\n    return str & AccessMode._BITMASK;\n  } else if (str === 'N' || str === 'n') {\n    return AccessMode._NONE;\n  }\n\n  const bitmask = {\n    'J': AccessMode._JOIN,\n    'R': AccessMode._READ,\n    'W': AccessMode._WRITE,\n    'P': AccessMode._PRES,\n    'A': AccessMode._APPROVE,\n    'S': AccessMode._SHARE,\n    'D': AccessMode._DELETE,\n    'O': AccessMode._OWNER\n  };\n\n  let m0 = AccessMode._NONE;\n\n  for (let i = 0; i < str.length; i++) {\n    const bit = bitmask[str.charAt(i).toUpperCase()];\n    if (!bit) {\n      // Unrecognized bit, skip.\n      continue;\n    }\n    m0 |= bit;\n  }\n  return m0;\n};\n\n/**\n * Convert numeric representation of the access mode into a string.\n *\n * @memberof Tinode.AccessMode\n * @static\n *\n * @param {number} val - access mode value to convert to a string.\n * @returns {string} - Access mode as a string.\n */\nAccessMode.encode = function(val) {\n  if (val === null || val === AccessMode._INVALID) {\n    return null;\n  } else if (val === AccessMode._NONE) {\n    return 'N';\n  }\n\n  const bitmask = ['J', 'R', 'W', 'P', 'A', 'S', 'D', 'O'];\n  let res = '';\n  for (let i = 0; i < bitmask.length; i++) {\n    if ((val & (1 << i)) != 0) {\n      res = res + bitmask[i];\n    }\n  }\n  return res;\n};\n\n/**\n * Update numeric representation of access mode with the new value. The value\n * is one of the following:\n *  - a string starting with '+' or '-' then the bits to add or remove, e.g. '+R-W' or '-PS'.\n *  - a new value of access mode\n *\n * @memberof Tinode.AccessMode\n * @static\n *\n * @param {number} val - access mode value to update.\n * @param {string} upd - update to apply to val.\n * @returns {number} - updated access mode.\n */\nAccessMode.update = function(val, upd) {\n  if (!upd || typeof upd != 'string') {\n    return val;\n  }\n\n  let action = upd.charAt(0);\n  if (action == '+' || action == '-') {\n    let val0 = val;\n    // Split delta-string like '+ABC-DEF+Z' into an array of parts including + and -.\n    const parts = upd.split(/([-+])/);\n    // Starting iteration from 1 because String.split() creates an array with the first empty element.\n    // Iterating by 2 because we parse pairs +/- then data.\n    for (let i = 1; i < parts.length - 1; i += 2) {\n      action = parts[i];\n      const m0 = AccessMode.decode(parts[i + 1]);\n      if (m0 == AccessMode._INVALID) {\n        return val;\n      }\n      if (m0 == null) {\n        continue;\n      }\n      if (action === '+') {\n        val0 |= m0;\n      } else if (action === '-') {\n        val0 &= ~m0;\n      }\n    }\n    val = val0;\n  } else {\n    // The string is an explicit new value 'ABC' rather than delta.\n    const val0 = AccessMode.decode(upd);\n    if (val0 != AccessMode._INVALID) {\n      val = val0;\n    }\n  }\n\n  return val;\n};\n\n/**\n * Bits present in a1 but missing in a2.\n *\n * @static\n * @memberof Tinode\n *\n * @param {number | string} a1 - access mode to subtract from.\n * @param {number | string} a2 - access mode to subtract.\n * @returns {number} access mode with bits present in a1 but missing in a2\n */\nAccessMode.diff = function(a1, a2) {\n  a1 = AccessMode.decode(a1);\n  a2 = AccessMode.decode(a2);\n\n  if (a1 == AccessMode._INVALID || a2 == AccessMode._INVALID) {\n    return AccessMode._INVALID;\n  }\n  return a1 & ~a2;\n};\n\n/**\n * AccessMode is a class representing topic access mode.\n *\n * @memberof Tinode\n * @class AccessMode\n */\nAccessMode.prototype = {\n  /**\n   * Custom formatter\n   */\n  toString: function() {\n    return '{\"mode\": \"' + AccessMode.encode(this.mode) +\n      '\", \"given\": \"' + AccessMode.encode(this.given) +\n      '\", \"want\": \"' + AccessMode.encode(this.want) + '\"}';\n  },\n  /**\n   * Convert numeric values to strings.\n   */\n  jsonHelper: function() {\n    return {\n      mode: AccessMode.encode(this.mode),\n      given: AccessMode.encode(this.given),\n      want: AccessMode.encode(this.want)\n    };\n  },\n  /**\n   * Assign value to 'mode'.\n   * @memberof Tinode.AccessMode\n   *\n   * @param {string | number} m - either a string representation of the access mode or a set of bits.\n   * @returns {AccessMode} - <b>this</b> AccessMode.\n   */\n  setMode: function(m) {\n    this.mode = AccessMode.decode(m);\n    return this;\n  },\n  /**\n   * Update 'mode' value.\n   * @memberof Tinode.AccessMode\n   *\n   * @param {string} u - string representation of the changes to apply to access mode.\n   * @returns {AccessMode} - <b>this</b> AccessMode.\n   */\n  updateMode: function(u) {\n    this.mode = AccessMode.update(this.mode, u);\n    return this;\n  },\n  /**\n   * Get 'mode' value as a string.\n   * @memberof Tinode.AccessMode\n   *\n   * @returns {string} - <b>mode</b> value.\n   */\n  getMode: function() {\n    return AccessMode.encode(this.mode);\n  },\n\n  /**\n   * Assign 'given' value.\n   * @memberof Tinode.AccessMode\n   *\n   * @param {string | number} g - either a string representation of the access mode or a set of bits.\n   * @returns {AccessMode} - <b>this</b> AccessMode.\n   */\n  setGiven: function(g) {\n    this.given = AccessMode.decode(g);\n    return this;\n  },\n  /**\n   * Update 'given' value.\n   * @memberof Tinode.AccessMode\n   *\n   * @param {string} u - string representation of the changes to apply to access mode.\n   * @returns {AccessMode} - <b>this</b> AccessMode.\n   */\n  updateGiven: function(u) {\n    this.given = AccessMode.update(this.given, u);\n    return this;\n  },\n  /**\n   * Get 'given' value as a string.\n   * @memberof Tinode.AccessMode\n   *\n   * @returns {string} - <b>given</b> value.\n   */\n  getGiven: function() {\n    return AccessMode.encode(this.given);\n  },\n\n  /**\n   * Assign 'want' value.\n   * @memberof Tinode.AccessMode\n   *\n   * @param {string | number} w - either a string representation of the access mode or a set of bits.\n   * @returns {AccessMode} - <b>this</b> AccessMode.\n   */\n  setWant: function(w) {\n    this.want = AccessMode.decode(w);\n    return this;\n  },\n  /**\n   * Update 'want' value.\n   * @memberof Tinode.AccessMode\n   *\n   * @param {string} u - string representation of the changes to apply to access mode.\n   * @returns {AccessMode} - <b>this</b> AccessMode.\n   */\n  updateWant: function(u) {\n    this.want = AccessMode.update(this.want, u);\n    return this;\n  },\n  /**\n   * Get 'want' value as a string.\n   * @memberof Tinode.AccessMode\n   *\n   * @returns {string} - <b>want</b> value.\n   */\n  getWant: function() {\n    return AccessMode.encode(this.want);\n  },\n\n  /**\n   * Get permissions present in 'want' but missing in 'given'.\n   * Inverse of {@link Tinode.AccessMode#getExcessive}\n   *\n   * @memberof Tinode.AccessMode\n   *\n   * @returns {string} permissions present in <b>want</b> but missing in <b>given</b>.\n   */\n  getMissing: function() {\n    return AccessMode.encode(this.want & ~this.given);\n  },\n\n  /**\n   * Get permissions present in 'given' but missing in 'want'.\n   * Inverse of {@link Tinode.AccessMode#getMissing}\n   * @memberof Tinode.AccessMode\n   *\n   * @returns {string} permissions present in <b>given</b> but missing in <b>want</b>.\n   */\n  getExcessive: function() {\n    return AccessMode.encode(this.given & ~this.want);\n  },\n\n  /**\n   * Update 'want', 'give', and 'mode' values.\n   * @memberof Tinode.AccessMode\n   *\n   * @param {AccessMode} val - new access mode value.\n   * @returns {AccessMode} - <b>this</b> AccessMode.\n   */\n  updateAll: function(val) {\n    if (val) {\n      this.updateGiven(val.given);\n      this.updateWant(val.want);\n      this.mode = this.given & this.want;\n    }\n    return this;\n  },\n\n  /**\n   * Check if Owner (O) flag is set.\n   * @memberof Tinode.AccessMode\n   * @param {string=} side - which permission to check: given, want, mode; default: mode.\n   * @returns {boolean} - true if flag is set.\n   */\n  isOwner: function(side) {\n    return AccessMode._checkFlag(this, side, AccessMode._OWNER);\n  },\n\n  /**\n   * Check if Presence (P) flag is set.\n   * @memberof Tinode.AccessMode\n   * @param {string=} side - which permission to check: given, want, mode; default: mode.\n   * @returns {boolean} - true if flag is set.\n   */\n  isPresencer: function(side) {\n    return AccessMode._checkFlag(this, side, AccessMode._PRES);\n  },\n\n  /**\n   * Check if Presence (P) flag is NOT set.\n   * @memberof Tinode.AccessMode\n   * @param {string=} side - which permission to check: given, want, mode; default: mode.\n   * @returns {boolean} - true if flag is set.\n   */\n  isMuted: function(side) {\n    return !this.isPresencer(side);\n  },\n\n  /**\n   * Check if Join (J) flag is set.\n   * @memberof Tinode.AccessMode\n   * @param {string=} side - which permission to check: given, want, mode; default: mode.\n   * @returns {boolean} - true if flag is set.\n   */\n  isJoiner: function(side) {\n    return AccessMode._checkFlag(this, side, AccessMode._JOIN);\n  },\n\n  /**\n   * Check if Reader (R) flag is set.\n   * @memberof Tinode.AccessMode\n   * @param {string=} side - which permission to check: given, want, mode; default: mode.\n   * @returns {boolean} - true if flag is set.\n   */\n  isReader: function(side) {\n    return AccessMode._checkFlag(this, side, AccessMode._READ);\n  },\n\n  /**\n   * Check if Writer (W) flag is set.\n   * @memberof Tinode.AccessMode\n   * @param {string=} side - which permission to check: given, want, mode; default: mode.\n   * @returns {boolean} - true if flag is set.\n   */\n  isWriter: function(side) {\n    return AccessMode._checkFlag(this, side, AccessMode._WRITE);\n  },\n\n  /**\n   * Check if Approver (A) flag is set.\n   * @memberof Tinode.AccessMode\n   * @param {string=} side - which permission to check: given, want, mode; default: mode.\n   * @returns {boolean} - true if flag is set.\n   */\n  isApprover: function(side) {\n    return AccessMode._checkFlag(this, side, AccessMode._APPROVE);\n  },\n\n  /**\n   * Check if either one of Owner (O) or Approver (A) flags is set.\n   * @memberof Tinode.AccessMode\n   * @param {string=} side - which permission to check: given, want, mode; default: mode.\n   * @returns {boolean} - true if flag is set.\n   */\n  isAdmin: function(side) {\n    return this.isOwner(side) || this.isApprover(side);\n  },\n\n  /**\n   * Check if either one of Owner (O), Approver (A), or Sharer (S) flags is set.\n   * @memberof Tinode.AccessMode\n   * @param {string=} side - which permission to check: given, want, mode; default: mode.\n   * @returns {boolean} - true if flag is set.\n   */\n  isSharer: function(side) {\n    return this.isAdmin(side) || AccessMode._checkFlag(this, side, AccessMode._SHARE);\n  },\n\n  /**\n   * Check if Deleter (D) flag is set.\n   * @memberof Tinode.AccessMode\n   * @param {string=} side - which permission to check: given, want, mode; default: mode.\n   * @returns {boolean} - true if flag is set.\n   */\n  isDeleter: function(side) {\n    return AccessMode._checkFlag(this, side, AccessMode._DELETE);\n  }\n};\n\n/**\n * @callback Tinode.Topic.onData\n * @param {Data} data - Data packet\n */\n/**\n * Topic is a class representing a logical communication channel.\n * @class Topic\n * @memberof Tinode\n *\n * @param {string} name - Name of the topic to create.\n * @param {Object=} callbacks - Object with various event callbacks.\n * @param {Tinode.Topic.onData} callbacks.onData - Callback which receives a {data} message.\n * @param {callback} callbacks.onMeta - Callback which receives a {meta} message.\n * @param {callback} callbacks.onPres - Callback which receives a {pres} message.\n * @param {callback} callbacks.onInfo - Callback which receives an {info} message.\n * @param {callback} callbacks.onMetaDesc - Callback which receives changes to topic desctioption {@link desc}.\n * @param {callback} callbacks.onMetaSub - Called for a single subscription record change.\n * @param {callback} callbacks.onSubsUpdated - Called after a batch of subscription changes have been recieved and cached.\n * @param {callback} callbacks.onDeleteTopic - Called after the topic is deleted.\n * @param {callback} callbacls.onAllMessagesReceived - Called when all requested {data} messages have been recived.\n */\nvar Topic = function(name, callbacks) {\n  // Parent Tinode object.\n  this._tinode = null;\n\n  // Server-provided data, locally immutable.\n  // topic name\n  this.name = name;\n  // timestamp when the topic was created\n  this.created = null;\n  // timestamp when the topic was last updated\n  this.updated = null;\n  // timestamp of the last messages\n  this.touched = null;\n  // access mode, see AccessMode\n  this.acs = new AccessMode(null);\n  // per-topic private data\n  this.private = null;\n  // per-topic public data\n  this.public = null;\n\n  // Locally cached data\n  // Subscribed users, for tracking read/recv/msg notifications.\n  this._users = {};\n\n  // Current value of locally issued seqId, used for pending messages.\n  this._queuedSeqId = LOCAL_SEQID;\n\n  // The maximum known {data.seq} value.\n  this._maxSeq = 0;\n  // The minimum known {data.seq} value.\n  this._minSeq = 0;\n  // Indicator that the last request for earlier messages returned 0.\n  this._noEarlierMsgs = false;\n  // The maximum known deletion ID.\n  this._maxDel = 0;\n  // User discovery tags\n  this._tags = [];\n  // Credentials such as email or phone number.\n  this._credentials = [];\n  // Message cache, sorted by message seq values, from old to new.\n  this._messages = CBuffer(function(a, b) {\n    return a.seq - b.seq;\n  }, true);\n  // Boolean, true if the topic is currently live\n  this._subscribed = false;\n  // Timestap when topic meta-desc update was recived.\n  this._lastDescUpdate = null;\n  // Timestap when topic meta-subs update was recived.\n  this._lastSubsUpdate = null;\n  // Topic created but not yet synced with the server. Used only during initialization.\n  this._new = true;\n\n  // Callbacks\n  if (callbacks) {\n    this.onData = callbacks.onData;\n    this.onMeta = callbacks.onMeta;\n    this.onPres = callbacks.onPres;\n    this.onInfo = callbacks.onInfo;\n    // A single desc update;\n    this.onMetaDesc = callbacks.onMetaDesc;\n    // A single subscription record;\n    this.onMetaSub = callbacks.onMetaSub;\n    // All subscription records received;\n    this.onSubsUpdated = callbacks.onSubsUpdated;\n    this.onTagsUpdated = callbacks.onTagsUpdated;\n    this.onCredsUpdated = callbacks.onCredsUpdated;\n    this.onDeleteTopic = callbacks.onDeleteTopic;\n    this.onAllMessagesReceived = callbacks.onAllMessagesReceived;\n  }\n};\n\nTopic.prototype = {\n  /**\n   * Check if the topic is subscribed.\n   * @memberof Tinode.Topic#\n   * @returns {boolean} True is topic is attached/subscribed, false otherwise.\n   */\n  isSubscribed: function() {\n    return this._subscribed;\n  },\n\n  /**\n   * Request topic to subscribe. Wrapper for {@link Tinode#subscribe}.\n   * @memberof Tinode.Topic#\n   *\n   * @param {Tinode.GetQuery=} getParams - get query parameters.\n   * @param {Tinode.SetParams=} setParams - set parameters.\n   * @returns {Promise} Promise to be resolved/rejected when the server responds to the request.\n   */\n  subscribe: function(getParams, setParams) {\n    // If the topic is already subscribed, return resolved promise\n    if (this._subscribed) {\n      return Promise.resolve(this);\n    }\n\n    // Send subscribe message, handle async response.\n    // If topic name is explicitly provided, use it. If no name, then it's a new group topic,\n    // use \"new\".\n    return this._tinode.subscribe(this.name || TOPIC_NEW, getParams, setParams).then((ctrl) => {\n      if (ctrl.code >= 300) {\n        // Do nothing if subscription status has not changed.\n        return ctrl;\n      }\n\n      this._subscribed = true;\n      this.acs = (ctrl.params && ctrl.params.acs) ? ctrl.params.acs : this.acs;\n\n      // Set topic name for new topics and add it to cache.\n      if (this._new) {\n        this._new = false;\n\n        // Name may change new123456 -> grpAbCdEf\n        this.name = ctrl.topic;\n\n        this.created = ctrl.ts;\n        this.updated = ctrl.ts;\n        // Don't assign touched, otherwise topic will be put on top of the list on subscribe.\n\n        this._cachePutSelf();\n\n        if (this.name != TOPIC_ME && this.name != TOPIC_FND) {\n          // Add the new topic to the list of contacts maintained by the 'me' topic.\n          const me = this._tinode.getMeTopic();\n          if (me) {\n            me._processMetaSub([{\n              _noForwarding: true,\n              topic: this.name,\n              created: ctrl.ts,\n              updated: ctrl.ts,\n              acs: this.acs\n            }]);\n          }\n        }\n\n        if (setParams && setParams.desc) {\n          setParams.desc._noForwarding = true;\n          this._processMetaDesc(setParams.desc);\n        }\n      }\n\n      return ctrl;\n    });\n  },\n\n  /**\n   * Create a draft of a message without sending it to the server.\n   * @memberof Tinode.Topic#\n   *\n   * @param {string | Object} data - Content to wrap in a draft.\n   * @param {Boolean=} noEcho - If <tt>true</tt> server will not echo message back to originating\n   * session. Otherwise the server will send a copy of the message to sender.\n   *\n   * @returns {Object} message draft.\n   */\n  createMessage: function(data, noEcho) {\n    return this._tinode.createMessage(this.name, data, noEcho);\n  },\n\n  /**\n   * Immediately publish data to topic. Wrapper for {@link Tinode#publish}.\n   * @memberof Tinode.Topic#\n   *\n   * @param {string | Object} data - Data to publish, either plain string or a Drafty object.\n   * @param {Boolean=} noEcho - If <tt>true</tt> server will not echo message back to originating\n   * @returns {Promise} Promise to be resolved/rejected when the server responds to the request.\n   */\n  publish: function(data, noEcho) {\n    return this.publishMessage(this.createMessage(data, noEcho));\n  },\n\n  /**\n   * Publish message created by {@link Tinode.Topic#createMessage}.\n   * @memberof Tinode.Topic#\n   *\n   * @param {Object} pub - {data} object to publish. Must be created by {@link Tinode.Topic#createMessage}\n   *\n   * @returns {Promise} Promise to be resolved/rejected when the server responds to the request.\n   */\n  publishMessage: function(pub) {\n    if (!this._subscribed) {\n      return Promise.reject(new Error(\"Cannot publish on inactive topic\"));\n    }\n\n    // Update header with attachment records.\n    if (Drafty.hasAttachments(pub.content) && !pub.head.attachments) {\n      let attachments = [];\n      Drafty.attachments(pub.content, (data) => {\n        attachments.push(data.ref);\n      });\n      pub.head.attachments = attachments;\n    }\n\n    // Send data.\n    pub._sending = true;\n    pub._failed = false;\n    return this._tinode.publishMessage(pub).then((ctrl) => {\n      pub._sending = false;\n      pub.ts = ctrl.ts;\n      this.swapMessageId(pub, ctrl.params.seq);\n      this._routeData(pub);\n      return ctrl;\n    }).catch((err) => {\n      this._tinode.logger(\"WARNING: Message rejected by the server\", err);\n      pub._sending = false;\n      pub._failed = true;\n      if (this.onData) {\n        this.onData();\n      }\n    });\n  },\n\n  /**\n   * Add message to local message cache, send to the server when the promise is resolved.\n   * If promise is null or undefined, the message will be sent immediately.\n   * The message is sent when the\n   * The message should be created by {@link Tinode.Topic#createMessage}.\n   * This is probably not the final API.\n   * @memberof Tinode.Topic#\n   *\n   * @param {Object} pub - Message to use as a draft.\n   * @param {Promise} prom - Message will be sent when this promise is resolved, discarded if rejected.\n   *\n   * @returns {Promise} derived promise.\n   */\n  publishDraft: function(pub, prom) {\n    if (!prom && !this._subscribed) {\n      return Promise.reject(new Error(\"Cannot publish on inactive topic\"));\n    }\n\n    const seq = pub.seq || this._getQueuedSeqId();\n    if (!pub._noForwarding) {\n      // The 'seq', 'ts', and 'from' are added to mimic {data}. They are removed later\n      // before the message is sent.\n\n      pub._noForwarding = true;\n      pub.seq = seq;\n      pub.ts = new Date();\n      pub.from = this._tinode.getCurrentUserID();\n\n      // Don't need an echo message because the message is added to local cache right away.\n      pub.noecho = true;\n      // Add to cache.\n      this._messages.put(pub);\n\n      if (this.onData) {\n        this.onData(pub);\n      }\n    }\n    // If promise is provided, send the queued message when it's resolved.\n    // If no promise is provided, create a resolved one and send immediately.\n    prom = (prom || Promise.resolve()).then(\n      ( /* argument ignored */ ) => {\n        if (pub._cancelled) {\n          return {\n            code: 300,\n            text: \"cancelled\"\n          };\n        }\n        return this.publishMessage(pub);\n      },\n      (err) => {\n        this._tinode.logger(\"WARNING: Message draft rejected\", err);\n        pub._sending = false;\n        pub._failed = true;\n        this._messages.delAt(this._messages.find(pub));\n        if (this.onData) {\n          this.onData();\n        }\n      });\n    return prom;\n  },\n\n  /**\n   * Leave the topic, optionally unsibscribe. Leaving the topic means the topic will stop\n   * receiving updates from the server. Unsubscribing will terminate user's relationship with the topic.\n   * Wrapper for {@link Tinode#leave}.\n   * @memberof Tinode.Topic#\n   *\n   * @param {Boolean=} unsub - If true, unsubscribe, otherwise just leave.\n   * @returns {Promise} Promise to be resolved/rejected when the server responds to the request.\n   */\n  leave: function(unsub) {\n    // It's possible to unsubscribe (unsub==true) from inactive topic.\n    if (!this._subscribed && !unsub) {\n      return Promise.reject(new Error(\"Cannot leave inactive topic\"));\n    }\n\n    // Send a 'leave' message, handle async response\n    return this._tinode.leave(this.name, unsub).then((ctrl) => {\n      this._resetSub();\n      if (unsub) {\n        this._tinode.cacheDel('topic', this.name);\n        this._gone();\n      }\n      return ctrl;\n    });\n  },\n\n  /**\n   * Request topic metadata from the server.\n   * @memberof Tinode.Topic#\n   *\n   * @param {Tinode.GetQuery} request parameters\n   *\n   * @returns {Promise} Promise to be resolved/rejected when the server responds to request.\n   */\n  getMeta: function(params) {\n    // Send {get} message, return promise.\n    return this._tinode.getMeta(this.name, params);\n  },\n\n  /**\n   * Request more messages from the server\n   * @memberof Tinode.Topic#\n   *\n   * @param {integer} limit number of messages to get.\n   * @param {boolean} forward if true, request newer messages.\n   */\n  getMessagesPage: function(limit, forward) {\n    const query = this.startMetaQuery();\n    if (forward) {\n      query.withLaterData(limit);\n    } else {\n      query.withEarlierData(limit);\n    }\n    let promise = this.getMeta(query.build());\n    if (!forward) {\n      promise = promise.then((ctrl) => {\n        if (ctrl && ctrl.params && !ctrl.params.count) {\n          this._noEarlierMsgs = true;\n        }\n      });\n    }\n    return promise;\n  },\n\n  /**\n   * Update topic metadata.\n   * @memberof Tinode.Topic#\n   *\n   * @param {Tinode.SetParams} params parameters to update.\n   * @returns {Promise} Promise to be resolved/rejected when the server responds to request.\n   */\n  setMeta: function(params) {\n    if (params.tags) {\n      params.tags = normalizeArray(params.tags);\n    }\n    // Send Set message, handle async response.\n    return this._tinode.setMeta(this.name, params)\n      .then((ctrl) => {\n        if (ctrl && ctrl.code >= 300) {\n          // Not modified\n          return ctrl;\n        }\n\n        if (params.sub) {\n          params.sub.topic = this.name;\n          if (ctrl.params && ctrl.params.acs) {\n            params.sub.acs = ctrl.params.acs;\n            params.sub.updated = ctrl.ts;\n          }\n          if (!params.sub.user) {\n            // This is a subscription update of the current user.\n            // Assign user ID otherwise the update will be ignored by _processMetaSub.\n            params.sub.user = this._tinode.getCurrentUserID();\n            if (!params.desc) {\n              // Force update to topic's asc.\n              params.desc = {};\n            }\n          }\n          params.sub._noForwarding = true;\n          this._processMetaSub([params.sub]);\n        }\n\n        if (params.desc) {\n          if (ctrl.params && ctrl.params.acs) {\n            params.desc.acs = ctrl.params.acs;\n            params.desc.updated = ctrl.ts;\n          }\n          this._processMetaDesc(params.desc);\n        }\n\n        if (params.tags) {\n          this._processMetaTags(params.tags);\n        }\n        if (params.cred) {\n          this._processMetaCreds([params.cred], true);\n        }\n\n        return ctrl;\n      });\n  },\n\n  /**\n   * Update access mode of the current user or of another topic subsriber.\n   * @memberof Tinode.Topic#\n   *\n   * @param {string} uid - UID of the user to update or null to update current user.\n   * @param {string} update - the update value, full or delta.\n   * @returns {Promise} Promise to be resolved/rejected when the server responds to request.\n   */\n  updateMode: function(uid, update) {\n    const user = uid ? this.subscriber(uid) : null;\n    const am = user ?\n      user.acs.updateGiven(update).getGiven() :\n      this.getAccessMode().updateWant(update).getWant();\n\n    return this.setMeta({\n      sub: {\n        user: uid,\n        mode: am\n      }\n    });\n  },\n\n  /**\n   * Create new topic subscription. Wrapper for {@link Tinode#setMeta}.\n   * @memberof Tinode.Topic#\n   *\n   * @param {String} uid - ID of the user to invite\n   * @param {String=} mode - Access mode. <tt>null</tt> means to use default.\n   *\n   * @returns {Promise} Promise to be resolved/rejected when the server responds to request.\n   */\n  invite: function(uid, mode) {\n    return this.setMeta({\n      sub: {\n        user: uid,\n        mode: mode\n      }\n    });\n  },\n\n  /**\n   * Archive or un-archive the topic. Wrapper for {@link Tinode#setMeta}.\n   * @memberof Tinode.Topic#\n   *\n   * @param {Boolean} arch - true to archive the topic, false otherwise.\n   *\n   * @returns {Promise} Promise to be resolved/rejected when the server responds to request.\n   */\n  archive: function(arch) {\n    if (this.private && this.private.arch == arch) {\n      return Promise.resolve(arch);\n    }\n    return this.setMeta({\n      desc: {\n        private: {\n          arch: arch ? true : Tinode.DEL_CHAR\n        }\n      }\n    });\n  },\n\n  /**\n   * Delete messages. Hard-deleting messages requires Owner permission.\n   * Wrapper for {@link Tinode#delMessages}.\n   * @memberof Tinode.Topic#\n   *\n   * @param {Tinode.DelRange[]} ranges - Ranges of message IDs to delete.\n   * @param {Boolean=} hard - Hard or soft delete\n   * @returns {Promise} Promise to be resolved/rejected when the server responds to request.\n   */\n  delMessages: function(ranges, hard) {\n    if (!this._subscribed) {\n      return Promise.reject(new Error(\"Cannot delete messages in inactive topic\"));\n    }\n\n    // Sort ranges in accending order by low, the descending by hi.\n    ranges.sort((r1, r2) => {\n      if (r1.low < r2.low) {\n        return true;\n      }\n      if (r1.low == r2.low) {\n        return !r2.hi || (r1.hi >= r2.hi);\n      }\n      return false;\n    });\n\n    // Remove pending messages from ranges possibly clipping some ranges.\n    let tosend = ranges.reduce((out, r) => {\n      if (r.low < LOCAL_SEQID) {\n        if (!r.hi || r.hi < LOCAL_SEQID) {\n          out.push(r);\n        } else {\n          // Clip hi to max allowed value.\n          out.push({\n            low: r.low,\n            hi: this._maxSeq + 1\n          });\n        }\n      }\n      return out;\n    }, []);\n\n    // Send {del} message, return promise\n    let result;\n    if (tosend.length > 0) {\n      result = this._tinode.delMessages(this.name, tosend, hard);\n    } else {\n      result = Promise.resolve({\n        params: {\n          del: 0\n        }\n      });\n    }\n    // Update local cache.\n    return result.then((ctrl) => {\n      if (ctrl.params.del > this._maxDel) {\n        this._maxDel = ctrl.params.del;\n      }\n\n      ranges.map((r) => {\n        if (r.hi) {\n          this.flushMessageRange(r.low, r.hi);\n        } else {\n          this.flushMessage(r.low);\n        }\n      });\n\n      this._updateDeletedRanges();\n\n      if (this.onData) {\n        // Calling with no parameters to indicate the messages were deleted.\n        this.onData();\n      }\n      return ctrl;\n    });\n  },\n\n  /**\n   * Delete all messages. Hard-deleting messages requires Owner permission.\n   * @memberof Tinode.Topic#\n   *\n   * @param {boolean} hardDel - true if messages should be hard-deleted.\n   *\n   * @returns {Promise} Promise to be resolved/rejected when the server responds to request.\n   */\n  delMessagesAll: function(hardDel) {\n    if (!this._maxSeq || this._maxSeq <= 0) {\n      // There are no messages to delete.\n      return Promise.resolve();\n    }\n    return this.delMessages([{\n      low: 1,\n      hi: this._maxSeq + 1,\n      _all: true\n    }], hardDel);\n  },\n\n  /**\n   * Delete multiple messages defined by their IDs. Hard-deleting messages requires Owner permission.\n   * @memberof Tinode.Topic#\n   *\n   * @param {Tinode.DelRange[]} list - list of seq IDs to delete\n   * @param {Boolean=} hardDel - true if messages should be hard-deleted.\n   *\n   * @returns {Promise} Promise to be resolved/rejected when the server responds to request.\n   */\n  delMessagesList: function(list, hardDel) {\n    // Sort the list in ascending order\n    list.sort((a, b) => a - b);\n    // Convert the array of IDs to ranges.\n    let ranges = list.reduce((out, id) => {\n      if (out.length == 0) {\n        // First element.\n        out.push({\n          low: id\n        });\n      } else {\n        let prev = out[out.length - 1];\n        if ((!prev.hi && (id != prev.low + 1)) || (id > prev.hi)) {\n          // New range.\n          out.push({\n            low: id\n          });\n        } else {\n          // Expand existing range.\n          prev.hi = prev.hi ? Math.max(prev.hi, id + 1) : id + 1;\n        }\n      }\n      return out;\n    }, []);\n    // Send {del} message, return promise\n    return this.delMessages(ranges, hardDel)\n  },\n\n  /**\n   * Delete topic. Requires Owner permission. Wrapper for {@link Tinode#delTopic}.\n   * @memberof Tinode.Topic#\n   *\n   * @param {Boolean} hard - had-delete topic.\n   * @returns {Promise} Promise to be resolved/rejected when the server responds to the request.\n   */\n  delTopic: function(hard) {\n    return this._tinode.delTopic(this.name, hard).then((ctrl) => {\n      this._resetSub();\n      this._gone();\n      return ctrl;\n    });\n  },\n\n  /**\n   * Delete subscription. Requires Share permission. Wrapper for {@link Tinode#delSubscription}.\n   * @memberof Tinode.Topic#\n   *\n   * @param {String} user - ID of the user to remove subscription for.\n   * @returns {Promise} Promise to be resolved/rejected when the server responds to request.\n   */\n  delSubscription: function(user) {\n    if (!this._subscribed) {\n      return Promise.reject(new Error(\"Cannot delete subscription in inactive topic\"));\n    }\n    // Send {del} message, return promise\n    return this._tinode.delSubscription(this.name, user).then((ctrl) => {\n      // Remove the object from the subscription cache;\n      delete this._users[user];\n      // Notify listeners\n      if (this.onSubsUpdated) {\n        this.onSubsUpdated(Object.keys(this._users));\n      }\n      return ctrl;\n    });\n  },\n\n  /**\n   * Send a read/recv notification\n   * @memberof Tinode.Topic#\n   *\n   * @param {String} what - what notification to send: <tt>recv</tt>, <tt>read</tt>.\n   * @param {Number} seq - ID or the message read or received.\n   */\n  note: function(what, seq) {\n    if (!this._subscribed) {\n      // Cannot sending {note} on an inactive topic\".\n      return;\n    }\n\n    // Update locally cached contact with the new count.\n\n    const me = this._tinode.getMeTopic();\n\n    const user = this._users[this._tinode.getCurrentUserID()];\n    let update = false;\n    if (user) {\n      // Known topic subscriber.\n      if (!user[what] || user[what] < seq) {\n        user[what] = seq;\n        update = true;\n      }\n    } else if (me) {\n      // Subscriber not found, such as in case of no S permission.\n      update = (me.getMsgReadRecv(this.name, what) < seq);\n    }\n\n    if (update) {\n      this._tinode.note(this.name, what, seq);\n    }\n\n    // Update locally cached contact with the new count.\n    if (me) {\n      me.setMsgReadRecv(this.name, what, seq);\n    }\n  },\n\n  /**\n   * Send a 'recv' receipt. Wrapper for {@link Tinode#noteRecv}.\n   * @memberof Tinode.Topic#\n   *\n   * @param {Number} seq - ID of the message to aknowledge.\n   */\n  noteRecv: function(seq) {\n    this.note('recv', seq);\n  },\n\n  /**\n   * Send a 'read' receipt. Wrapper for {@link Tinode#noteRead}.\n   * @memberof Tinode.Topic#\n   *\n   * @param {Number} seq - ID of the message to aknowledge or 0/undefined to acknowledge the latest messages.\n   */\n  noteRead: function(seq) {\n    seq = seq || this._maxSeq;\n    if (seq > 0) {\n      this.note('read', seq);\n    }\n  },\n\n  /**\n   * Send a key-press notification. Wrapper for {@link Tinode#noteKeyPress}.\n   * @memberof Tinode.Topic#\n   */\n  noteKeyPress: function() {\n    if (this._subscribed) {\n      this._tinode.noteKeyPress(this.name);\n    } else {\n      this._tinode.logger(\"INFO: Cannot send notification in inactive topic\");\n    }\n  },\n\n  /**\n   * Get user description from global cache. The user does not need to be a\n   * subscriber of this topic.\n   * @memberof Tinode.Topic#\n   *\n   * @param {String} uid - ID of the user to fetch.\n   * @return {Object} user description or undefined.\n   */\n  userDesc: function(uid) {\n    // TODO(gene): handle asynchronous requests\n\n    const user = this._cacheGetUser(uid);\n    if (user) {\n      return user; // Promise.resolve(user)\n    }\n  },\n\n  /**\n   * Get description of the p2p peer from subscription cache.\n   * @memberof Tinode.Topic#\n   *\n   * @return {Object} peer's description or undefined.\n   */\n  p2pPeerDesc: function() {\n    if (!this.isP2P()) {\n      return undefined;\n    }\n    return this._users[this.name];\n  },\n\n  /**\n   * Iterate over cached subscribers. If callback is undefined, use this.onMetaSub.\n   * @memberof Tinode.Topic#\n   *\n   * @param {Function} callback - Callback which will receive subscribers one by one.\n   * @param {Object=} context - Value of `this` inside the `callback`.\n   */\n  subscribers: function(callback, context) {\n    const cb = (callback || this.onMetaSub);\n    if (cb) {\n      for (let idx in this._users) {\n        cb.call(context, this._users[idx], idx, this._users);\n      }\n    }\n  },\n\n  /**\n   * Get a copy of cached tags.\n   * @memberof Tinode.Topic#\n   * @return a copy of tags\n   */\n  tags: function() {\n    // Return a copy.\n    return this._tags.slice(0);\n  },\n\n  /**\n   * Get cached subscription for the given user ID.\n   * @memberof Tinode.Topic#\n   *\n   * @param {String} uid - id of the user to query for\n   * @return user description or undefined.\n   */\n  subscriber: function(uid) {\n    return this._users[uid];\n  },\n\n  /**\n   * Iterate over cached messages. If callback is undefined, use this.onData.\n   * @memberof Tinode.Topic#\n   *\n   * @param {function} callback - Callback which will receive messages one by one. See {@link Tinode.CBuffer#forEach}\n   * @param {integer} sinceId - Optional seqId to start iterating from (inclusive).\n   * @param {integer} beforeId - Optional seqId to stop iterating before (exclusive).\n   * @param {Object} context - Value of `this` inside the `callback`.\n   */\n  messages: function(callback, sinceId, beforeId, context) {\n    const cb = (callback || this.onData);\n    if (cb) {\n      let startIdx = typeof sinceId == 'number' ? this._messages.find({\n        seq: sinceId\n      }, true) : undefined;\n      let beforeIdx = typeof beforeId == 'number' ? this._messages.find({\n        seq: beforeId\n      }, true) : undefined;\n      if (startIdx != -1 && beforeIdx != -1) {\n        this._messages.forEach(cb, startIdx, beforeIdx, context);\n      }\n    }\n  },\n\n  /**\n   * Iterate over cached unsent messages. Wraps {@link Tinode.Topic#messages}.\n   * @memberof Tinode.Topic#\n   *\n   * @param {function} callback - Callback which will receive messages one by one. See {@link Tinode.CBuffer#forEach}\n   * @param {Object} context - Value of `this` inside the `callback`.\n   */\n  queuedMessages: function(callback, context) {\n    if (!callback) {\n      throw new Error(\"Callback must be provided\");\n    }\n    this.messages(callback, LOCAL_SEQID, undefined, context);\n  },\n\n  /**\n   * Get the number of topic subscribers who marked this message as either recv or read\n   * Current user is excluded from the count.\n   * @memberof Tinode.Topic#\n   *\n   * @param {String} what - what notification to send: <tt>recv</tt>, <tt>read</tt>.\n   * @param {Number} seq - ID or the message read or received.\n   */\n  msgReceiptCount: function(what, seq) {\n    let count = 0;\n    if (seq > 0) {\n      const me = this._tinode.getCurrentUserID();\n      for (let idx in this._users) {\n        const user = this._users[idx];\n        if (user.user !== me && user[what] >= seq) {\n          count++;\n        }\n      }\n    }\n    return count;\n  },\n\n  /**\n   * Get the number of topic subscribers who marked this message (and all older messages) as read.\n   * The current user is excluded from the count.\n   * @memberof Tinode.Topic#\n   *\n   * @param {Number} seq - Message id to check.\n   * @returns {Number} Number of subscribers who claim to have received the message.\n   */\n  msgReadCount: function(seq) {\n    return this.msgReceiptCount('read', seq);\n  },\n\n  /**\n   * Get the number of topic subscribers who marked this message (and all older messages) as received.\n   * The current user is excluded from the count.\n   * @memberof Tinode.Topic#\n   *\n   * @param {number} seq - Message id to check.\n   * @returns {number} Number of subscribers who claim to have received the message.\n   */\n  msgRecvCount: function(seq) {\n    return this.msgReceiptCount('recv', seq);\n  },\n\n  /**\n   * Check if cached message IDs indicate that the server may have more messages.\n   * @memberof Tinode.Topic#\n   *\n   * @param {boolean} newer check for newer messages\n   */\n  msgHasMoreMessages: function(newer) {\n    return newer ? this.seq > this._maxSeq :\n      // _minSeq cound be more than 1, but earlier messages could have been deleted.\n      (this._minSeq > 1 && !this._noEarlierMsgs);\n  },\n\n  /**\n   * Check if the given seq Id is id of the most recent message.\n   * @memberof Tinode.Topic#\n   *\n   * @param {integer} seqId id of the message to check\n   */\n  isNewMessage: function(seqId) {\n    return this._maxSeq <= seqId;\n  },\n\n  /**\n   * Remove one message from local cache.\n   * @memberof Tinode.Topic#\n   *\n   * @param {integer} seqId id of the message to remove from cache.\n   * @returns {Message} removed message or undefined if such message was not found.\n   */\n  flushMessage: function(seqId) {\n    const idx = this._messages.find({\n      seq: seqId\n    });\n    return idx >= 0 ? this._messages.delAt(idx) : undefined;\n  },\n\n  /**\n   * Update message's seqId.\n   * @memberof Tinode.Topic#\n   *\n   * @param {Object} pub message object.\n   * @param {integer} newSeqId new seq id for pub.\n   */\n  swapMessageId: function(pub, newSeqId) {\n    const idx = this._messages.find({\n      seq: pub.seq\n    });\n    const numMessages = this._messages.length();\n    pub.seq = newSeqId;\n    if (0 <= idx && idx < numMessages) {\n      // this._messages are sorted by `seq`.\n      // If changing pub.seq to newSeqId breaks the invariant, fix it.\n      if ((idx > 0 && this._messages.getAt(idx - 1).seq >= newSeqId) ||\n        (idx + 1 < numMessages && newSeqId < this._messages.getAt(idx + 1).seq <= newSeqId)) {\n        this._messages.delAt(idx);\n        this._messages.put(pub);\n      }\n    }\n  },\n\n  /**\n   * Remove a range of messages from the local cache.\n   * @memberof Tinode.Topic#\n   *\n   * @param {integer} fromId seq ID of the first message to remove (inclusive).\n   * @param {integer} untilId seqID of the last message to remove (exclusive).\n   *\n   * @returns {Message[]} array of removed messages (could be empty).\n   */\n  flushMessageRange: function(fromId, untilId) {\n    // start, end: find insertion points (nearest == true).\n    const since = this._messages.find({\n      seq: fromId\n    }, true);\n    return since >= 0 ? this._messages.delRange(since, this._messages.find({\n      seq: untilId\n    }, true)) : [];\n  },\n\n  /**\n   * Attempt to stop message from being sent.\n   * @memberof Tinode.Topic#\n   *\n   * @param {integer} seqId id of the message to stop sending and remove from cache.\n   *\n   * @returns {boolean} true if message was cancelled, false otherwise.\n   */\n  cancelSend: function(seqId) {\n    const idx = this._messages.find({\n      seq: seqId\n    });\n    if (idx >= 0) {\n      const msg = this._messages.getAt(idx);\n      const status = this.msgStatus(msg);\n      if (status == MESSAGE_STATUS_QUEUED || status == MESSAGE_STATUS_FAILED) {\n        msg._cancelled = true;\n        this._messages.delAt(idx);\n        if (this.onData) {\n          // Calling with no parameters to indicate the message was deleted.\n          this.onData();\n        }\n        return true;\n      }\n    }\n    return false;\n  },\n\n  /**\n   * Get type of the topic: me, p2p, grp, fnd...\n   * @memberof Tinode.Topic#\n   *\n   * @returns {String} One of 'me', 'p2p', 'grp', 'fnd', 'sys' or <tt>undefined</tt>.\n   */\n  getType: function() {\n    return Tinode.topicType(this.name);\n  },\n\n  /**\n   * Get user's cumulative access mode of the topic.\n   * @memberof Tinode.Topic#\n   *\n   * @returns {Tinode.AccessMode} - user's access mode\n   */\n  getAccessMode: function() {\n    return this.acs;\n  },\n\n  /**\n   * Get topic's default access mode.\n   * @memberof Tinode.Topic#\n   *\n   * @returns {Tinode.DefAcs} - access mode, such as {auth: `RWP`, anon: `N`}.\n   */\n  getDefaultAccess: function() {\n    return this.defacs;\n  },\n\n  /**\n   * Initialize new meta {@link Tinode.GetQuery} builder. The query is attched to the current topic.\n   * It will not work correctly if used with a different topic.\n   * @memberof Tinode.Topic#\n   *\n   * @returns {Tinode.MetaGetBuilder} query attached to the current topic.\n   */\n  startMetaQuery: function() {\n    return new MetaGetBuilder(this);\n  },\n\n  /**\n   * Check if topic is archived, i.e. private.arch == true.\n   * @memberof Tinode.Topic#\n   *\n   * @returns {boolean} - true if topic is archived, false otherwise.\n   */\n  isArchived: function() {\n    return this.private && this.private.arch ? true : false;\n  },\n\n  /**\n   * Check if topic is a channel.\n   * @memberof Tinode.Topic#\n   *\n   * @returns {boolean} - true if topic is a channel, false otherwise.\n   */\n  isChannel: function() {\n    return Tinode.isChannelTopicName(this.name);\n  },\n\n  /**\n   * Check if topic is a group topic.\n   * @memberof Tinode.Topic#\n   *\n   * @returns {boolean} - true if topic is a group, false otherwise.\n   */\n  isGroup: function() {\n    return Tinode.isGroupTopicName(this.name);\n  },\n\n  /**\n   * Check if topic is a p2p topic.\n   * @memberof Tinode.Topic#\n   *\n   * @returns {boolean} - true if topic is a p2p topic, false otherwise.\n   */\n  isP2P: function() {\n    return Tinode.isP2PTopicName(this.name);\n  },\n\n  /**\n   * Get status (queued, sent, received etc) of a given message in the context\n   * of this topic.\n   * @memberof Tinode.Topic#\n   *\n   * @param {Message} msg message to check for status.\n   * @returns message status constant.\n   */\n  msgStatus: function(msg) {\n    let status = MESSAGE_STATUS_NONE;\n    if (this._tinode.isMe(msg.from)) {\n      if (msg._sending) {\n        status = MESSAGE_STATUS_SENDING;\n      } else if (msg._failed || msg._cancelled) {\n        status = MESSAGE_STATUS_FAILED;\n      } else if (msg.seq >= LOCAL_SEQID) {\n        status = MESSAGE_STATUS_QUEUED;\n      } else if (this.msgReadCount(msg.seq) > 0) {\n        status = MESSAGE_STATUS_READ;\n      } else if (this.msgRecvCount(msg.seq) > 0) {\n        status = MESSAGE_STATUS_RECEIVED;\n      } else if (msg.seq > 0) {\n        status = MESSAGE_STATUS_SENT;\n      }\n    } else {\n      status = MESSAGE_STATUS_TO_ME;\n    }\n    return status;\n  },\n\n  // Process data message\n  _routeData: function(data) {\n    if (data.content) {\n      if (!this.touched || this.touched < data.ts) {\n        this.touched = data.ts;\n      }\n    }\n\n    if (data.seq > this._maxSeq) {\n      this._maxSeq = data.seq;\n    }\n    if (data.seq < this._minSeq || this._minSeq == 0) {\n      this._minSeq = data.seq;\n    }\n\n    if (!data._noForwarding) {\n      this._messages.put(data);\n      this._updateDeletedRanges();\n    }\n\n    if (this.onData) {\n      this.onData(data);\n    }\n\n    // Update locally cached contact with the new message count.\n    const me = this._tinode.getMeTopic();\n    if (me) {\n      // Messages from the current user are considered to be read already.\n      me.setMsgReadRecv(this.name,\n        (!data.from || this._tinode.isMe(data.from)) ? 'read' : 'msg', data.seq, data.ts);\n    }\n  },\n\n  // Process metadata message\n  _routeMeta: function(meta) {\n    if (meta.desc) {\n      this._lastDescUpdate = meta.ts;\n      this._processMetaDesc(meta.desc);\n    }\n    if (meta.sub && meta.sub.length > 0) {\n      this._lastSubsUpdate = meta.ts;\n      this._processMetaSub(meta.sub);\n    }\n    if (meta.del) {\n      this._processDelMessages(meta.del.clear, meta.del.delseq);\n    }\n    if (meta.tags) {\n      this._processMetaTags(meta.tags);\n    }\n    if (meta.cred) {\n      this._processMetaCreds(meta.cred);\n    }\n    if (this.onMeta) {\n      this.onMeta(meta);\n    }\n  },\n\n  // Process presence change message\n  _routePres: function(pres) {\n    let user;\n    switch (pres.what) {\n      case 'del':\n        // Delete cached messages.\n        this._processDelMessages(pres.clear, pres.delseq);\n        break;\n      case 'on':\n      case 'off':\n        // Update online status of a subscription.\n        user = this._users[pres.src];\n        if (user) {\n          user.online = pres.what == 'on';\n        } else {\n          this._tinode.logger(\"WARNING: Presence update for an unknown user\", this.name, pres.src);\n        }\n        break;\n      case 'term':\n        // Attachment to topic is terminated probably due to cluster rehashing.\n        this._resetSub();\n        break;\n      case 'acs':\n        const uid = pres.src || this._tinode.getCurrentUserID();\n        user = this._users[uid];\n        if (!user) {\n          // Update for an unknown user: notification of a new subscription.\n          const acs = new AccessMode().updateAll(pres.dacs);\n          if (acs && acs.mode != AccessMode._NONE) {\n            user = this._cacheGetUser(uid);\n            if (!user) {\n              user = {\n                user: uid,\n                acs: acs\n              };\n              this.getMeta(this.startMetaQuery().withOneSub(undefined, uid).build());\n            } else {\n              user.acs = acs;\n            }\n            user.updated = new Date();\n            this._processMetaSub([user]);\n          }\n        } else {\n          // Known user\n          user.acs.updateAll(pres.dacs);\n          // Update user's access mode.\n          this._processMetaSub([{\n            user: uid,\n            updated: new Date(),\n            acs: user.acs\n          }]);\n        }\n        break;\n      default:\n        this._tinode.logger(\"INFO: Ignored presence update\", pres.what);\n    }\n\n    if (this.onPres) {\n      this.onPres(pres);\n    }\n  },\n\n  // Process {info} message\n  _routeInfo: function(info) {\n    if (info.what !== 'kp') {\n      const user = this._users[info.from];\n      if (user) {\n        user[info.what] = info.seq;\n        if (user.recv < user.read) {\n          user.recv = user.read;\n        }\n      }\n\n      // If this is an update from the current user, update the contact with the new count too.\n      if (this._tinode.isMe(info.from)) {\n        const me = this._tinode.getMeTopic();\n        if (me) {\n          me.setMsgReadRecv(info.topic, info.what, info.seq);\n        }\n      }\n    }\n    if (this.onInfo) {\n      this.onInfo(info);\n    }\n  },\n\n  // Called by Tinode when meta.desc packet is received.\n  // Called by 'me' topic on contact update (desc._noForwarding is true).\n  _processMetaDesc: function(desc) {\n    // Synthetic desc may include defacs for p2p topics which is useless.\n    // Remove it.\n    if (this.isP2P()) {\n      delete desc.defacs;\n    }\n\n    // Copy parameters from desc object to this topic.\n    mergeObj(this, desc);\n    // Make sure date fields are Date().\n    stringToDate(this);\n\n    // Update relevant contact in the me topic, if available:\n    if (this.name !== TOPIC_ME && !desc._noForwarding) {\n      const me = this._tinode.getMeTopic();\n      if (me) {\n        // Must use original 'desc' instead of 'this' so not to lose DEL_CHAR.\n        me._processMetaSub([{\n          _noForwarding: true,\n          topic: this.name,\n          updated: this.updated,\n          touched: this.touched,\n          acs: desc.acs,\n          seq: desc.seq,\n          read: desc.read,\n          recv: desc.recv,\n          public: desc.public,\n          private: desc.private\n        }]);\n      }\n    }\n\n    if (this.onMetaDesc) {\n      this.onMetaDesc(this);\n    }\n  },\n\n  // Called by Tinode when meta.sub is recived or in response to received\n  // {ctrl} after setMeta-sub.\n  _processMetaSub: function(subs) {\n    for (let idx in subs) {\n      const sub = subs[idx];\n\n      sub.updated = new Date(sub.updated);\n      sub.deleted = sub.deleted ? new Date(sub.deleted) : null;\n\n      let user = null;\n      if (!sub.deleted) {\n        // If this is a change to user's own permissions, update them in topic too.\n        // Desc will update 'me' topic.\n        if (this._tinode.isMe(sub.user) && sub.acs) {\n          this._processMetaDesc({\n            updated: sub.updated || new Date(),\n            touched: sub.updated,\n            acs: sub.acs\n          });\n        }\n        user = this._updateCachedUser(sub.user, sub);\n      } else {\n        // Subscription is deleted, remove it from topic (but leave in Users cache)\n        delete this._users[sub.user];\n        user = sub;\n      }\n\n      if (this.onMetaSub) {\n        this.onMetaSub(user);\n      }\n    }\n\n    if (this.onSubsUpdated) {\n      this.onSubsUpdated(Object.keys(this._users));\n    }\n  },\n\n  // Called by Tinode when meta.tags is recived.\n  _processMetaTags: function(tags) {\n    if (tags.length == 1 && tags[0] == Tinode.DEL_CHAR) {\n      tags = [];\n    }\n    this._tags = tags;\n    if (this.onTagsUpdated) {\n      this.onTagsUpdated(tags);\n    }\n  },\n\n  // Do nothing for topics other than 'me'\n  _processMetaCreds: function(creds) {},\n\n  // Delete cached messages and update cached transaction IDs\n  _processDelMessages: function(clear, delseq) {\n    this._maxDel = Math.max(clear, this._maxDel);\n    this.clear = Math.max(clear, this.clear);\n    const topic = this;\n    let count = 0;\n    if (Array.isArray(delseq)) {\n      delseq.map(function(range) {\n        if (!range.hi) {\n          count++;\n          topic.flushMessage(range.low);\n        } else {\n          for (let i = range.low; i < range.hi; i++) {\n            count++;\n            topic.flushMessage(i);\n          }\n        }\n      });\n    }\n\n    if (count > 0) {\n      this._updateDeletedRanges();\n\n      if (this.onData) {\n        this.onData();\n      }\n    }\n  },\n\n  // Topic is informed that the entire response to {get what=data} has been received.\n  _allMessagesReceived: function(count) {\n    this._updateDeletedRanges();\n\n    if (this.onAllMessagesReceived) {\n      this.onAllMessagesReceived(count);\n    }\n  },\n\n  // Reset subscribed state\n  _resetSub: function() {\n    this._subscribed = false;\n  },\n\n  // This topic is either deleted or unsubscribed from.\n  _gone: function() {\n    this._messages.reset();\n    this._users = {};\n    this.acs = new AccessMode(null);\n    this.private = null;\n    this.public = null;\n    this._maxSeq = 0;\n    this._minSeq = 0;\n    this._subscribed = false;\n\n    const me = this._tinode.getMeTopic();\n    if (me) {\n      me._routePres({\n        _noForwarding: true,\n        what: 'gone',\n        topic: TOPIC_ME,\n        src: this.name\n      });\n    }\n    if (this.onDeleteTopic) {\n      this.onDeleteTopic();\n    }\n  },\n\n  // Update global user cache and local subscribers cache.\n  // Don't call this method for non-subscribers.\n  _updateCachedUser: function(uid, obj) {\n    // Fetch user object from the global cache.\n    // This is a clone of the stored object\n    let cached = this._cacheGetUser(uid);\n    cached = mergeObj(cached || {}, obj);\n    // Save to global cache\n    this._cachePutUser(uid, cached);\n    // Save to the list of topic subsribers.\n    return mergeToCache(this._users, uid, cached);\n  },\n\n  // Get local seqId for a queued message.\n  _getQueuedSeqId: function() {\n    return this._queuedSeqId++;\n  },\n\n  // Calculate ranges of missing messages.\n  _updateDeletedRanges: function() {\n    const ranges = [];\n\n    let prev = null;\n    // Check for gap in the beginning, before the first message.\n    const first = this._messages.getAt(0);\n    if (first && this._minSeq > 1 && !this._noEarlierMsgs) {\n      // Some messages are missing in the beginning.\n      if (first.hi) {\n        // The first message already represents a gap.\n        if (first.seq > 1) {\n          first.seq = 1;\n        }\n        if (first.hi < this._minSeq - 1) {\n          first.hi = this._minSeq - 1;\n        }\n        prev = first;\n      } else {\n        // Create new gap.\n        prev = {\n          seq: 1,\n          hi: this._minSeq - 1\n        };\n        ranges.push(prev);\n      }\n    } else {\n      // No gap in the beginning.\n      prev = {\n        seq: 0,\n        hi: 0\n      };\n    }\n\n    // Find gaps in the list of received messages. The list contains messages-proper as well\n    // as placeholers for deleted ranges.\n    // The messages are iterated by seq ID in ascending order.\n    this._messages.forEach((data) => {\n      // Do not create a gap between the last sent message and the first unsent.\n      if (data.seq >= LOCAL_SEQID) {\n        return;\n      }\n\n      // New message is reducing the existing gap\n      if (data.seq == (prev.hi || prev.seq) + 1) {\n        // No new gap. Replace previous with current.\n        prev = data;\n        return;\n      }\n\n      // Found a new gap.\n      if (prev.hi) {\n        // Previous is also a gap, alter it.\n        prev.hi = data.hi || data.seq;\n        return;\n      }\n\n      // Previous is not a gap. Create a new gap.\n      prev = {\n        seq: (prev.hi || prev.seq) + 1,\n        hi: data.hi || data.seq\n      };\n      ranges.push(prev);\n    });\n\n    // Check for missing messages at the end.\n    // All messages could be missing or it could be a new topic with no messages.\n    const last = this._messages.getLast();\n    const maxSeq = Math.max(this.seq, this._maxSeq) || 0;\n    if ((maxSeq > 0 && !last) || (last && ((last.hi || last.seq) < maxSeq))) {\n      if (last && last.hi) {\n        // Extend existing gap\n        last.hi = maxSeq;\n      } else {\n        // Create new gap.\n        ranges.push({\n          seq: last ? last.seq + 1 : 1,\n          hi: maxSeq\n        });\n      }\n    }\n\n    // Insert new gaps into cache.\n    ranges.map((gap) => {\n      this._messages.put(gap);\n    });\n  }\n};\n\n/**\n * @class TopicMe - special case of {@link Tinode.Topic} for\n * managing data of the current user, including contact list.\n * @extends Tinode.Topic\n * @memberof Tinode\n *\n * @param {TopicMe.Callbacks} callbacks - Callbacks to receive various events.\n */\nvar TopicMe = function(callbacks) {\n  Topic.call(this, TOPIC_ME, callbacks);\n  // List of contacts (topic_name -> Contact object)\n  this._contacts = {};\n\n  // me-specific callbacks\n  if (callbacks) {\n    this.onContactUpdate = callbacks.onContactUpdate;\n  }\n};\n\n// Inherit everyting from the generic Topic\nTopicMe.prototype = Object.create(Topic.prototype, {\n  // Override the original Topic._processMetaDesc.\n  _processMetaDesc: {\n    value: function(desc) {\n      // Check if online contacts need to be turned off because P permission was removed.\n      const turnOff = (desc.acs && !desc.acs.isPresencer()) && (this.acs && this.acs.isPresencer());\n\n      // Copy parameters from desc object to this topic.\n      mergeObj(this, desc);\n      // String datetime headers to Date() objects.\n      stringToDate(this);\n\n      // 'P' permission was removed. All topics are offline now.\n      if (turnOff) {\n        Object.values(this._contacts).map((cont) => {\n          if (cont.online) {\n            cont.online = false;\n            if (cont.seen) {\n              cont.seen.when = new Date();\n            } else {\n              cont.seen = {\n                when: new Date()\n              };\n            }\n            if (this.onContactUpdate) {\n              this.onContactUpdate('off', cont);\n            }\n          }\n        });\n      }\n\n      if (this.onMetaDesc) {\n        this.onMetaDesc(this);\n      }\n    },\n    enumerable: true,\n    configurable: true,\n    writable: false\n  },\n\n  // Override the original Topic._processMetaSub\n  _processMetaSub: {\n    value: function(subs) {\n      let updateCount = 0;\n      for (let idx in subs) {\n        const sub = subs[idx];\n        const topicName = sub.topic;\n\n        // Don't show 'me' and 'fnd' topics in the list of contacts.\n        if (topicName == TOPIC_FND || topicName == TOPIC_ME) {\n          continue;\n        }\n        sub.updated = new Date(sub.updated);\n        sub.touched = sub.touched ? new Date(sub.touched) : undefined;\n        sub.deleted = sub.deleted ? new Date(sub.deleted) : null;\n\n        let cont = null;\n        if (sub.deleted) {\n          cont = sub;\n          delete this._contacts[topicName];\n          this._tinode.cacheDel('topic', topicName);\n        } else {\n          // Ensure the values are defined and are integers.\n          if (typeof sub.seq != 'undefined') {\n            sub.seq = sub.seq | 0;\n            sub.recv = sub.recv | 0;\n            sub.read = sub.read | 0;\n            sub.unread = sub.seq - sub.read;\n          }\n\n          if (sub.seen && sub.seen.when) {\n            sub.seen.when = new Date(sub.seen.when);\n          }\n          cont = mergeToCache(this._contacts, topicName, sub);\n\n          if (Tinode.isP2PTopicName(topicName)) {\n            this._cachePutUser(topicName, cont);\n          }\n          // Notify topic of the update if it's an external update.\n          if (!sub._noForwarding) {\n            const topic = this._tinode.getTopic(topicName);\n            if (topic) {\n              sub._noForwarding = true;\n              topic._processMetaDesc(sub);\n            }\n          }\n        }\n\n        updateCount++;\n\n        if (this.onMetaSub) {\n          this.onMetaSub(cont);\n        }\n      }\n\n      if (this.onSubsUpdated) {\n        this.onSubsUpdated(Object.keys(this._contacts), updateCount);\n      }\n    },\n    enumerable: true,\n    configurable: true,\n    writable: false\n  },\n\n  // Called by Tinode when meta.sub is recived.\n  _processMetaCreds: {\n    value: function(creds, upd) {\n      if (creds.length == 1 && creds[0] == Tinode.DEL_CHAR) {\n        creds = [];\n      }\n      if (upd) {\n        creds.map((cr) => {\n          if (cr.val) {\n            // Adding a credential.\n            let idx = this._credentials.findIndex((el) => {\n              return el.meth == cr.meth && el.val == cr.val;\n            });\n            if (idx < 0) {\n              // Not found.\n              if (!cr.done) {\n                // Unconfirmed credential replaces previous unconfirmed credential of the same method.\n                idx = this._credentials.findIndex((el) => {\n                  return el.meth == cr.meth && !el.done;\n                });\n                if (idx >= 0) {\n                  // Remove previous unconfirmed credential.\n                  this._credentials.splice(idx, 1);\n                }\n              }\n              this._credentials.push(cr);\n            } else {\n              // Found. Maybe change 'done' status.\n              this._credentials[idx].done = cr.done;\n            }\n          } else if (cr.resp) {\n            // Handle credential confirmation.\n            const idx = this._credentials.findIndex((el) => {\n              return el.meth == cr.meth && !el.done;\n            });\n            if (idx >= 0) {\n              this._credentials[idx].done = true;\n            }\n          }\n        });\n      } else {\n        this._credentials = creds;\n      }\n      if (this.onCredsUpdated) {\n        this.onCredsUpdated(this._credentials);\n      }\n    },\n    enumerable: true,\n    configurable: true,\n    writable: false\n  },\n\n  // Process presence change message\n  _routePres: {\n    value: function(pres) {\n      if (pres.what == 'term') {\n        // The 'me' topic itself is detached. Mark as unsubscribed.\n        this._resetSub();\n        return;\n      }\n\n      if (pres.what == 'upd' && pres.src == TOPIC_ME) {\n        // Update to me's description. Request updated value.\n        this.getMeta(this.startMetaQuery().withDesc().build());\n        return;\n      }\n\n      const cont = this._contacts[pres.src];\n      if (cont) {\n        switch (pres.what) {\n          case 'on': // topic came online\n            cont.online = true;\n            break;\n          case 'off': // topic went offline\n            if (cont.online) {\n              cont.online = false;\n              if (cont.seen) {\n                cont.seen.when = new Date();\n              } else {\n                cont.seen = {\n                  when: new Date()\n                };\n              }\n            }\n            break;\n          case 'msg': // new message received\n            cont.touched = new Date();\n            cont.seq = pres.seq | 0;\n            // Check if message is sent by the current user. If so it's been read already.\n            if (!pres.act || this._tinode.isMe(pres.act)) {\n              cont.read = cont.read ? Math.max(cont.read, cont.seq) : cont.seq;\n              cont.recv = cont.recv ? Math.max(cont.read, cont.recv) : cont.read;\n            }\n            cont.unread = cont.seq - (cont.read | 0);\n            break;\n          case 'upd': // desc updated\n            // Request updated subscription.\n            this.getMeta(this.startMetaQuery().withLaterOneSub(pres.src).build());\n            break;\n          case 'acs': // access mode changed\n            if (cont.acs) {\n              cont.acs.updateAll(pres.dacs);\n            } else {\n              cont.acs = new AccessMode().updateAll(pres.dacs);\n            }\n            cont.touched = new Date();\n            break;\n          case 'ua': // user agent changed\n            cont.seen = {\n              when: new Date(),\n              ua: pres.ua\n            };\n            break;\n          case 'recv': // user's other session marked some messges as received\n            pres.seq = pres.seq | 0;\n            cont.recv = cont.recv ? Math.max(cont.recv, pres.seq) : pres.seq;\n            break;\n          case 'read': // user's other session marked some messages as read\n            pres.seq = pres.seq | 0;\n            cont.read = cont.read ? Math.max(cont.read, pres.seq) : pres.seq;\n            cont.recv = cont.recv ? Math.max(cont.read, cont.recv) : cont.recv;\n            cont.unread = cont.seq - cont.read;\n            break;\n          case 'gone': // topic deleted or unsubscribed from\n            delete this._contacts[pres.src];\n            this._tinode.cacheDel('topic', pres.src);\n            break;\n          case 'del':\n            // Update topic.del value.\n            break;\n          default:\n            this._tinode.logger(\"INFO: Unsupported presence update in 'me'\", pres.what);\n        }\n\n        if (this.onContactUpdate) {\n          this.onContactUpdate(pres.what, cont);\n        }\n      } else {\n        if (pres.what == 'acs') {\n          // New subscriptions and deleted/banned subscriptions have full\n          // access mode (no + or - in the dacs string). Changes to known subscriptions are sent as\n          // deltas, but they should not happen here.\n          const acs = new AccessMode(pres.dacs);\n          if (!acs || acs.mode == AccessMode._INVALID) {\n            this._tinode.logger(\"ERROR: Invalid access mode update\", pres.src, pres.dacs);\n            return;\n          } else if (acs.mode == AccessMode._NONE) {\n            this._tinode.logger(\"WARNING: Removing non-existent subscription\", pres.src, pres.dacs);\n            return;\n          } else {\n            // New subscription. Send request for the full description.\n            // Using .withOneSub (not .withLaterOneSub) to make sure IfModifiedSince is not set.\n            this.getMeta(this.startMetaQuery().withOneSub(undefined, pres.src).build());\n            // Create a dummy entry to catch online status update.\n            this._contacts[pres.src] = {\n              touched: new Date(),\n              topic: pres.src,\n              online: false,\n              acs: acs\n            };\n          }\n        } else if (pres.what == 'tags') {\n          this.getMeta(this.startMetaQuery().withTags().build());\n        }\n      }\n\n      if (this.onPres) {\n        this.onPres(pres);\n      }\n    },\n    enumerable: true,\n    configurable: true,\n    writable: false\n  },\n\n  /**\n   * Publishing to TopicMe is not supported. {@link Topic#publish} is overriden and thows an {Error} if called.\n   * @memberof Tinode.TopicMe#\n   * @throws {Error} Always throws an error.\n   */\n  publish: {\n    value: function() {\n      return Promise.reject(new Error(\"Publishing to 'me' is not supported\"));\n    },\n    enumerable: true,\n    configurable: true,\n    writable: false\n  },\n\n  /**\n   * Delete validation credential.\n   * @memberof Tinode.TopicMe#\n   *\n   * @param {String} topic - Name of the topic to delete\n   * @param {String} user - User ID to remove.\n   * @returns {Promise} Promise which will be resolved/rejected on receiving server reply.\n   */\n  delCredential: {\n    value: function(method, value) {\n      if (!this._subscribed) {\n        return Promise.reject(new Error(\"Cannot delete credential in inactive 'me' topic\"));\n      }\n      // Send {del} message, return promise\n      return this._tinode.delCredential(method, value).then((ctrl) => {\n        // Remove deleted credential from the cache.\n        const index = this._credentials.findIndex((el) => {\n          return el.meth == method && el.val == value;\n        });\n        if (index > -1) {\n          this._credentials.splice(index, 1);\n        }\n        // Notify listeners\n        if (this.onCredsUpdated) {\n          this.onCredsUpdated(this._credentials);\n        }\n        return ctrl;\n      });\n\n    },\n    enumerable: true,\n    configurable: true,\n    writable: false\n  },\n\n  /**\n   * Iterate over cached contacts.\n   *\n   * @function\n   * @memberof Tinode.TopicMe#\n   * @param {TopicMe.ContactCallback} callback - Callback to call for each contact.\n   * @param {function=} filter - Optionally filter contacts; include all if filter is false-ish, otherwise include those for\n   *                            which filter returns true-ish.\n   * @param {Object=} context - Context to use for calling the `callback`, i.e. the value of `this` inside the callback.\n   */\n  contacts: {\n    value: function(callback, filter, context) {\n      for (let idx in this._contacts) {\n        const c = this._contacts[idx];\n        if (!filter || filter(c)) {\n          callback.call(context, c, idx, this._contacts);\n        }\n      }\n    },\n    enumerable: true,\n    configurable: true,\n    writable: true\n  },\n\n  /**\n   * Update a cached contact with new read/received/message count.\n   * @function\n   * @memberof Tinode.TopicMe#\n   *\n   * @param {String} contactName - UID of contact to update.\n   * @param {String} what - Which count to update, one of <tt>\"read\", \"recv\", \"msg\"</tt>\n   * @param {Number} seq - New value of the count.\n   * @param {Date} ts - Timestamp of the update.\n   */\n  setMsgReadRecv: {\n    value: function(contactName, what, seq, ts) {\n      const cont = this._contacts[contactName];\n      let oldVal, doUpdate = false;\n      let mode = null;\n      if (cont) {\n        seq = seq | 0;\n        cont.seq = cont.seq | 0;\n        cont.read = cont.read | 0;\n        cont.recv = cont.recv | 0;\n        switch (what) {\n          case 'recv':\n            oldVal = cont.recv;\n            cont.recv = Math.max(cont.recv, seq);\n            doUpdate = (oldVal != cont.recv);\n            break;\n          case 'read':\n            oldVal = cont.read;\n            cont.read = Math.max(cont.read, seq);\n            doUpdate = (oldVal != cont.read);\n            break;\n          case 'msg':\n            oldVal = cont.seq;\n            cont.seq = Math.max(cont.seq, seq);\n            if (!cont.touched || cont.touched < ts) {\n              cont.touched = ts;\n            }\n            doUpdate = (oldVal != cont.seq);\n            break;\n        }\n\n        // Sanity checks.\n        if (cont.recv < cont.read) {\n          cont.recv = cont.read;\n          doUpdate = true;\n        }\n        if (cont.seq < cont.recv) {\n          cont.seq = cont.recv;\n          if (!cont.touched || cont.touched < ts) {\n            cont.touched = ts;\n          }\n          doUpdate = true;\n        }\n        cont.unread = cont.seq - cont.read;\n\n        if (doUpdate && (!cont.acs || !cont.acs.isMuted()) && this.onContactUpdate) {\n          this.onContactUpdate(what, cont);\n        }\n      }\n    },\n    enumerable: true,\n    configurable: true,\n    writable: true\n  },\n\n  /**\n   * Get cached read/received/message count for the given contact.\n   * @function\n   * @memberof Tinode.TopicMe#\n   *\n   * @param {String} contactName - UID of contact to read.\n   * @param {String} what - Which count to read, one of <tt>\"read\", \"recv\", \"msg\"</tt>\n   */\n  getMsgReadRecv: {\n    value: function(contactName, what) {\n      const cont = this._contacts[contactName];\n      if (cont) {\n        switch (what) {\n          case 'recv':\n            return cont.recv | 0;\n          case 'read':\n            return cont.read | 0;\n          case 'msg':\n            return cont.seq | 0;\n        }\n      }\n      return 0;\n    },\n    enumerable: true,\n    configurable: true,\n    writable: true\n  },\n\n  /**\n   * Get a contact from cache.\n   * @memberof Tinode.TopicMe#\n   *\n   * @param {string} name - Name of the contact to get, either a UID (for p2p topics) or a topic name.\n   * @returns {Tinode.Contact} - Contact or `undefined`.\n   */\n  getContact: {\n    value: function(name) {\n      return this._contacts[name];\n    },\n    enumerable: true,\n    configurable: true,\n    writable: true\n  },\n\n  /**\n   * Get access mode of a given contact from cache.\n   * @memberof Tinode.TopicMe#\n   *\n   * @param {String} name - Name of the contact to get access mode for, either a UID (for p2p topics)\n   *        or a topic name; if missing, access mode for the 'me' topic itself.\n   * @returns {string} - access mode, such as `RWP`.\n   */\n  getAccessMode: {\n    value: function(name) {\n      if (name) {\n        const cont = this._contacts[name];\n        return cont ? cont.acs : null;\n      }\n      return this.acs;\n    },\n    enumerable: true,\n    configurable: true,\n    writable: true\n  },\n\n  /**\n   * Check if contact is archived, i.e. contact.private.arch == true.\n   * @memberof Tinode.TopicMe#\n   *\n   * @param {String} name - Name of the contact to check archived status, either a UID (for p2p topics) or a topic name.\n   * @returns {boolean} - true if contact is archived, false otherwise.\n   */\n  isArchived: {\n    value: function(name) {\n      const cont = this._contacts[name];\n      return cont ? ((cont.private && cont.private.arch) ? true : false) : null;\n    },\n    enumerable: true,\n    configurable: true,\n    writable: true\n  },\n\n  /**\n   * @typedef Tinode.Credential\n   * @memberof Tinode\n   * @type Object\n   * @property {string} meth - validation method such as 'email' or 'tel'.\n   * @property {string} val - credential value, i.e. 'jdoe@example.com' or '+17025551234'\n   * @property {boolean} done - true if credential is validated.\n   */\n  /**\n   * Get the user's credentials: email, phone, etc.\n   * @memberof Tinode.TopicMe#\n   *\n   * @returns {Tinode.Credential[]} - array of credentials.\n   */\n  getCredentials: {\n    value: function() {\n      return this._credentials;\n    },\n    enumerable: true,\n    configurable: true,\n    writable: true\n  }\n});\nTopicMe.prototype.constructor = TopicMe;\n\n/**\n * @class TopicFnd - special case of {@link Tinode.Topic} for searching for\n * contacts and group topics.\n * @extends Tinode.Topic\n * @memberof Tinode\n *\n * @param {TopicFnd.Callbacks} callbacks - Callbacks to receive various events.\n */\nvar TopicFnd = function(callbacks) {\n  Topic.call(this, TOPIC_FND, callbacks);\n  // List of users and topics uid or topic_name -> Contact object)\n  this._contacts = {};\n};\n\n// Inherit everyting from the generic Topic\nTopicFnd.prototype = Object.create(Topic.prototype, {\n  // Override the original Topic._processMetaSub\n  _processMetaSub: {\n    value: function(subs) {\n      let updateCount = Object.getOwnPropertyNames(this._contacts).length;\n      // Reset contact list.\n      this._contacts = {};\n      for (let idx in subs) {\n        let sub = subs[idx];\n        const indexBy = sub.topic ? sub.topic : sub.user;\n\n        sub.updated = new Date(sub.updated);\n        if (sub.seen && sub.seen.when) {\n          sub.seen.when = new Date(sub.seen.when);\n        }\n\n        sub = mergeToCache(this._contacts, indexBy, sub);\n        updateCount++;\n\n        if (this.onMetaSub) {\n          this.onMetaSub(sub);\n        }\n      }\n\n      if (updateCount > 0 && this.onSubsUpdated) {\n        this.onSubsUpdated(Object.keys(this._contacts));\n      }\n    },\n    enumerable: true,\n    configurable: true,\n    writable: false\n  },\n\n  /**\n   * Publishing to TopicFnd is not supported. {@link Topic#publish} is overriden and thows an {Error} if called.\n   * @memberof Tinode.TopicFnd#\n   * @throws {Error} Always throws an error.\n   */\n  publish: {\n    value: function() {\n      return Promise.reject(new Error(\"Publishing to 'fnd' is not supported\"));\n    },\n    enumerable: true,\n    configurable: true,\n    writable: false\n  },\n\n  /**\n   * setMeta to TopicFnd resets contact list in addition to sending the message.\n   * @memberof Tinode.TopicFnd#\n   * @param {Tinode.SetParams} params parameters to update.\n   * @returns {Promise} Promise to be resolved/rejected when the server responds to request.\n   */\n  setMeta: {\n    value: function(params) {\n      const instance = this;\n      return Object.getPrototypeOf(TopicFnd.prototype).setMeta.call(this, params).then(function() {\n        if (Object.keys(instance._contacts).length > 0) {\n          instance._contacts = {};\n          if (instance.onSubsUpdated) {\n            instance.onSubsUpdated([]);\n          }\n        }\n      });\n    },\n    enumerable: true,\n    configurable: true,\n    writable: false\n  },\n\n  /**\n   * Iterate over found contacts. If callback is undefined, use {@link this.onMetaSub}.\n   * @function\n   * @memberof Tinode.TopicFnd#\n   * @param {TopicFnd.ContactCallback} callback - Callback to call for each contact.\n   * @param {Object} context - Context to use for calling the `callback`, i.e. the value of `this` inside the callback.\n   */\n  contacts: {\n    value: function(callback, context) {\n      const cb = (callback || this.onMetaSub);\n      if (cb) {\n        for (let idx in this._contacts) {\n          cb.call(context, this._contacts[idx], idx, this._contacts);\n        }\n      }\n    },\n    enumerable: true,\n    configurable: true,\n    writable: true\n  }\n});\nTopicFnd.prototype.constructor = TopicFnd;\n\n/**\n * @class LargeFileHelper - collection of utilities for uploading and downloading files\n * out of band. Don't instantiate this class directly. Use {Tinode.getLargeFileHelper} instead.\n * @memberof Tinode\n *\n * @param {Tinode} tinode - the main Tinode object.\n */\nvar LargeFileHelper = function(tinode) {\n  this._tinode = tinode;\n\n  this._apiKey = tinode._apiKey;\n  this._authToken = tinode.getAuthToken();\n  this._msgId = tinode.getNextUniqueId();\n  this.xhr = new XMLHttpRequest();\n\n  // Promise\n  this.toResolve = null;\n  this.toReject = null;\n\n  // Callbacks\n  this.onProgress = null;\n  this.onSuccess = null;\n  this.onFailure = null;\n}\n\nLargeFileHelper.prototype = {\n  /**\n   * Start uploading the file to a non-default endpoint.\n   *\n   * @memberof Tinode.LargeFileHelper#\n   *\n   * @param {String} baseUrl alternative base URL of upload server.\n   * @param {File|Blob} data to upload\n   * @param {Callback} onProgress callback. Takes one {float} parameter 0..1\n   * @param {Callback} onSuccess callback. Called when the file is successfully uploaded.\n   * @param {Callback} onFailure callback. Called in case of a failure.\n   *\n   * @returns {Promise} resolved/rejected when the upload is completed/failed.\n   */\n  uploadWithBaseUrl: function(baseUrl, data, onProgress, onSuccess, onFailure) {\n    if (!this._authToken) {\n      throw new Error(\"Must authenticate first\");\n    }\n    const instance = this;\n\n    let url = '/v' + PROTOCOL_VERSION + '/file/u/';\n    if (baseUrl) {\n      if (baseUrl.indexOf('http://') == 0 || baseUrl.indexOf('https://') == 0) {\n        url = baseUrl + url;\n      } else {\n        throw new Error(\"Invalid base URL '\" + baseUrl + \"'\");\n      }\n    }\n    this.xhr.open('POST', url, true);\n    this.xhr.setRequestHeader('X-Tinode-APIKey', this._apiKey);\n    this.xhr.setRequestHeader('X-Tinode-Auth', 'Token ' + this._authToken.token);\n    const result = new Promise((resolve, reject) => {\n      this.toResolve = resolve;\n      this.toReject = reject;\n    });\n\n    this.onProgress = onProgress;\n    this.onSuccess = onSuccess;\n    this.onFailure = onFailure;\n\n    this.xhr.upload.onprogress = (e) => {\n      if (e.lengthComputable && instance.onProgress) {\n        instance.onProgress(e.loaded / e.total);\n      }\n    }\n\n    this.xhr.onload = function() {\n      let pkt;\n      try {\n        pkt = JSON.parse(this.response, jsonParseHelper);\n      } catch (err) {\n        instance._tinode.logger(\"ERROR: Invalid server response in LargeFileHelper\", this.response);\n        pkt = {\n          ctrl: {\n            code: this.status,\n            text: this.statusText\n          }\n        };\n      }\n\n      if (this.status >= 200 && this.status < 300) {\n        if (instance.toResolve) {\n          instance.toResolve(pkt.ctrl.params.url);\n        }\n        if (instance.onSuccess) {\n          instance.onSuccess(pkt.ctrl);\n        }\n      } else if (this.status >= 400) {\n        if (instance.toReject) {\n          instance.toReject(new Error(pkt.ctrl.text + \" (\" + pkt.ctrl.code + \")\"));\n        }\n        if (instance.onFailure) {\n          instance.onFailure(pkt.ctrl)\n        }\n      } else {\n        instance._tinode.logger(\"ERROR: Unexpected server response status\", this.status, this.response);\n      }\n    };\n\n    this.xhr.onerror = function(e) {\n      if (instance.toReject) {\n        instance.toReject(new Error(\"failed\"));\n      }\n      if (instance.onFailure) {\n        instance.onFailure(null);\n      }\n    };\n\n    this.xhr.onabort = function(e) {\n      if (instance.toReject) {\n        instance.toReject(new Error(\"upload cancelled by user\"));\n      }\n      if (instance.onFailure) {\n        instance.onFailure(null);\n      }\n    };\n\n    try {\n      const form = new FormData();\n      form.append('file', data);\n      form.set('id', this._msgId);\n      this.xhr.send(form);\n    } catch (err) {\n      if (this.toReject) {\n        this.toReject(err);\n      }\n      if (this.onFailure) {\n        this.onFailure(null);\n      }\n    }\n\n    return result;\n  },\n\n  /**\n   * Start uploading the file to default endpoint.\n   *\n   * @memberof Tinode.LargeFileHelper#\n   *\n   * @param {File|Blob} data to upload\n   * @param {Callback} onProgress callback. Takes one {float} parameter 0..1\n   * @param {Callback} onSuccess callback. Called when the file is successfully uploaded.\n   * @param {Callback} onFailure callback. Called in case of a failure.\n   *\n   * @returns {Promise} resolved/rejected when the upload is completed/failed.\n   */\n  upload: function(data, onProgress, onSuccess, onFailure) {\n    return this.uploadWithBaseUrl(undefined, data, onProgress, onSuccess, onFailure);\n  },\n\n  /**\n   * Download the file from a given URL using GET request. This method works with the Tinode server only.\n   *\n   * @memberof Tinode.LargeFileHelper#\n   *\n   * @param {String} relativeUrl - URL to download the file from. Must be relative url, i.e. must not contain the host.\n   * @param {String=} filename - file name to use for the downloaded file.\n   *\n   * @returns {Promise} resolved/rejected when the download is completed/failed.\n   */\n  download: function(relativeUrl, filename, mimetype, onProgress, onError) {\n    if (!Tinode.isRelativeURL(relativeUrl)) {\n      // As a security measure refuse to download from an absolute URL.\n      if (onError) {\n        onError(\"The URL '\" + relativeUrl + \"' must be relative, not absolute\");\n      }\n      return;\n    }\n    if (!this._authToken) {\n      if (onError) {\n        onError(\"Must authenticate first\");\n      }\n      return;\n    }\n    const instance = this;\n    // Get data as blob (stored by the browser as a temporary file).\n    this.xhr.open('GET', relativeUrl, true);\n    this.xhr.setRequestHeader('X-Tinode-APIKey', this._apiKey);\n    this.xhr.setRequestHeader('X-Tinode-Auth', 'Token ' + this._authToken.token);\n    this.xhr.responseType = 'blob';\n\n    this.onProgress = onProgress;\n    this.xhr.onprogress = function(e) {\n      if (instance.onProgress) {\n        // Passing e.loaded instead of e.loaded/e.total because e.total\n        // is always 0 with gzip compression enabled by the server.\n        instance.onProgress(e.loaded);\n      }\n    };\n\n    const result = new Promise((resolve, reject) => {\n      this.toResolve = resolve;\n      this.toReject = reject;\n    });\n\n    // The blob needs to be saved as file. 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void(this.onNetworkProbe&&this.onNetworkProbe());let t=JSON.parse(e,_);t?(this.logger("in: "+(this._trimLongStrings?JSON.stringify(t,b):e)),this.onMessage&&this.onMessage(t),t.ctrl?(this.onCtrlMessage&&this.onCtrlMessage(t.ctrl),t.ctrl.id&&d(t.ctrl.id,t.ctrl.code,t.ctrl,t.ctrl.text),setTimeout(()=>{if(205==t.ctrl.code&&"evicted"==t.ctrl.text){const e=a("topic",t.ctrl.topic);e&&(e._resetSub(),t.ctrl.params&&t.ctrl.params.unsub&&e._gone())}else if(t.ctrl.params&&"data"==t.ctrl.params.what){const e=a("topic",t.ctrl.topic);e&&e._allMessagesReceived(t.ctrl.params.count)}else if(t.ctrl.params&&"sub"==t.ctrl.params.what){const e=a("topic",t.ctrl.topic);e&&e._processMetaSub([])}},0)):setTimeout(()=>{if(t.meta){const e=a("topic",t.meta.topic);e&&e._routeMeta(t.meta),t.meta.id&&d(t.meta.id,200,t.meta,"META"),this.onMetaMessage&&this.onMetaMessage(t.meta)}else if(t.data){const e=a("topic",t.data.topic);e&&e._routeData(t.data),this.onDataMessage&&this.onDataMessage(t.data)}else if(t.pres){const e=a("topic",t.pres.topic);e&&e._routePres(t.pres),this.onPresMessage&&this.onPresMessage(t.pres)}else if(t.info){const e=a("topic",t.info.topic);e&&e._routeInfo(t.info),this.onInfoMessage&&this.onInfoMessage(t.info)}else this.logger("ERROR: Unknown packet received.")},0)):(this.logger("in: "+e),this.logger("ERROR: failed to parse data"))},this._connection.onOpen=()=>{this._expirePromises||(this._expirePromises=setInterval(()=>{const e=new Error("Timeout (504)"),t=new Date((new Date).getTime()-5e3);for(let n in this._pendingPromises){let s=this._pendingPromises[n];s&&s.ts{this.onAutoreconnectIteration&&this.onAutoreconnectIteration(e,t)},this._connection.onDisconnect=(e,t)=>{this._inPacketCount=0,this._serverInfo=null,this._authenticated=!1,this._expirePromises&&(clearInterval(this._expirePromises),this._expirePromises=null),l((e,t)=>{0===t.lastIndexOf("topic:",0)&&e._resetSub()});for(let t in this._pendingPromises){let n=this._pendingPromises[t];n&&n.reject&&n.reject(e)}this._pendingPromises={},this.onDisconnect&&this.onDisconnect(e)}};M.credential=function(e,t,n,s){return"object"==typeof e&&({val:t,params:n,resp:s,meth:e}=e),e&&(t||s)?[{meth:e,val:t,resp:s,params:n}]:null},M.topicType=function(e){return{me:"me",fnd:"fnd",grp:"grp",new:"grp",nch:"grp",chn:"grp",usr:"p2p",sys:"sys"}["string"==typeof e?e.substring(0,3):"xxx"]},M.isGroupTopicName=function(e){return"grp"===M.topicType(e)},M.isP2PTopicName=function(e){return"p2p"===M.topicType(e)},M.isNewGroupTopicName=function(e){return"string"==typeof e&&("new"==e.substring(0,3)||"nch"==e.substring(0,3))},M.isChannelTopicName=function(e){return"string"==typeof e&&("chn"==e.substring(0,3)||"nch"==e.substring(0,3))},M.getVersion=function(){return c},M.setNetworkProviders=function(e,t){r=e,a=t},M.getLibrary=function(){return u},M.MESSAGE_STATUS_NONE=0,M.MESSAGE_STATUS_QUEUED=1,M.MESSAGE_STATUS_SENDING=2,M.MESSAGE_STATUS_FAILED=3,M.MESSAGE_STATUS_SENT=4,M.MESSAGE_STATUS_RECEIVED=5,M.MESSAGE_STATUS_READ=6,M.MESSAGE_STATUS_TO_ME=7,M.DEL_CHAR="␡",M.isNullValue=function(e){return e===M.DEL_CHAR},M.isRelativeURL=function(e){return!/^\s*([a-z][a-z0-9+.-]*:|\/\/)/im.test(e)},M.MAX_MESSAGE_SIZE="maxMessageSize",M.MAX_SUBSCRIBER_COUNT="maxSubscriberCount",M.MAX_TAG_COUNT="maxTagCount",M.MAX_FILE_UPLOAD_SIZE="maxFileUploadSize",M.prototype={connect:function(e){return this._connection.connect(e)},reconnect:function(e){this._connection.reconnect(e)},disconnect:function(){this._connection.disconnect()},networkProbe:function(){this._connection.probe()},isConnected:function(){return this._connection.isConnected()},isAuthenticated:function(){return this._authenticated},authorizeURL:function(e){if(!e)return e;if(M.isRelativeURL(e)){const t="scheme://host/",n=new URL(e,t);this._apiKey&&n.searchParams.append("apikey",this._apiKey),this._authToken.token&&(n.searchParams.append("auth","token"),n.searchParams.append("secret",this._authToken.token)),e=n.toString().substring(t.length-1)}return e},account:function(e,t,n,s,i){const o=this.initPacket("acc");return o.acc.user=e,o.acc.scheme=t,o.acc.secret=n,o.acc.login=s,i&&(o.acc.desc.defacs=i.defacs,o.acc.desc.public=i.public,o.acc.desc.private=i.private,o.acc.tags=i.tags,o.acc.cred=i.cred,o.acc.token=i.token),this.send(o,o.acc.id)},createAccount:function(e,t,n,s){let i=this.account("new",e,t,n,s);return n&&(i=i.then(e=>(this.loginSuccessful(e),e))),i},createAccountBasic:function(e,t,n){return e=e||"",t=t||"",this.createAccount("basic",f(e+":"+t),!0,n)},updateAccountBasic:function(e,t,n,s){return t=t||"",n=n||"",this.account(e,"basic",f(t+":"+n),!1,s)},hello:function(){const e=this.initPacket("hi");return this.send(e,e.hi.id).then(e=>(this._connection.backoffReset(),e.params&&(this._serverInfo=e.params),this.onConnect&&this.onConnect(),e)).catch(e=>{this._connection.reconnect(!0),this.onDisconnect&&this.onDisconnect(e)})},setDeviceToken:function(e,t){let n=!1;return e&&e!=this._deviceToken&&(this._deviceToken=e,t&&this.isConnected()&&this.isAuthenticated()&&(this.send({hi:{dev:e}}),n=!0)),n},login:function(e,t,n){const s=this.initPacket("login");return s.login.scheme=e,s.login.secret=t,s.login.cred=n,this.send(s,s.login.id).then(e=>(this.loginSuccessful(e),e))},loginBasic:function(e,t,n){return this.login("basic",f(e+":"+t),n).then(t=>(this._login=e,t))},loginToken:function(e,t){return this.login("token",e,t)},requestResetAuthSecret:function(e,t,n){return this.login("reset",f(e+":"+t+":"+n))},getAuthToken:function(){return this._authToken&&this._authToken.expires.getTime()>Date.now()?this._authToken:(this._authToken=null,null)},setAuthToken:function(e){this._authToken=e},subscribe:function(e,t,n){const s=this.initPacket("sub",e);return e||(e="new"),s.sub.get=t,n&&(n.sub&&(s.sub.set.sub=n.sub),n.desc&&(M.isNewGroupTopicName(e)?s.sub.set.desc=n.desc:M.isP2PTopicName(e)&&n.desc.defacs&&(s.sub.set.desc={defacs:n.desc.defacs})),n.tags&&(s.sub.set.tags=n.tags)),this.send(s,s.sub.id)},leave:function(e,t){const n=this.initPacket("leave",e);return n.leave.unsub=t,this.send(n,n.leave.id)},createMessage:function(e,t,n){const s=this.initPacket("pub",e);let o="string"==typeof t?i.parse(t):t;return o&&!i.isPlainText(o)&&(s.pub.head={mime:i.getContentType()},t=o),s.pub.noecho=n,s.pub.content=t,s.pub},publish:function(e,t,n){return this.publishMessage(this.createMessage(e,t,n))},publishMessage:function(e){return(e=Object.assign({},e)).seq=void 0,e.from=void 0,e.ts=void 0,this.send({pub:e},e.id)},getMeta:function(e,t){const n=this.initPacket("get",e);return n.get=p(n.get,t),this.send(n,n.get.id)},setMeta:function(e,t){const n=this.initPacket("set",e),s=[];return t&&["desc","sub","tags","cred"].map((function(e){t.hasOwnProperty(e)&&(s.push(e),n.set[e]=t[e])})),0==s.length?Promise.reject(new Error("Invalid {set} parameters")):this.send(n,n.set.id)},delMessages:function(e,t,n){const s=this.initPacket("del",e);return s.del.what="msg",s.del.delseq=t,s.del.hard=n,this.send(s,s.del.id)},delTopic:function(e,t){const n=this.initPacket("del",e);return n.del.what="topic",n.del.hard=t,this.send(n,n.del.id).then(t=>(this.cacheDel("topic",e),this.ctrl))},delSubscription:function(e,t){const n=this.initPacket("del",e);return n.del.what="sub",n.del.user=t,this.send(n,n.del.id)},delCredential:function(e,t){const n=this.initPacket("del","me");return n.del.what="cred",n.del.cred={meth:e,val:t},this.send(n,n.del.id)},delCurrentUser:function(e){const t=this.initPacket("del",null);return t.del.what="user",t.del.hard=e,this.send(t,t.del.id).then(e=>{this._myUID=null})},note:function(e,t,n){if(n<=0||n>=268435455)throw new Error("Invalid message id "+n);const s=this.initPacket("note",e);s.note.what=t,s.note.seq=n,this.send(s)},noteKeyPress:function(e){const t=this.initPacket("note",e);t.note.what="kp",this.send(t)},getTopic:function(e){let t=this.cacheGet("topic",e);return!t&&e&&(t="me"==e?new y:"fnd"==e?new D:new T(e),this.cachePut("topic",e,t),this.attachCacheToTopic(t)),t},isTopicCached:function(e){return!!this.cacheGet("topic",e)},newTopic:function(e){const t=new T("new",e);return this.attachCacheToTopic(t),t},newChannel:function(e){const t=new T("nch",e);return this.attachCacheToTopic(t),t},newGroupTopicName:function(e){return(e?"nch":"new")+this.getNextUniqueId()},newTopicWith:function(e,t){const n=new T(e,t);return this.attachCacheToTopic(n),n},getMeTopic:function(){return this.getTopic("me")},getFndTopic:function(){return this.getTopic("fnd")},getLargeFileHelper:function(){return new R(this)},getCurrentUserID:function(){return this._myUID},isMe:function(e){return this._myUID===e},getCurrentLogin:function(){return this._login},getServerInfo:function(){return this._serverInfo},getServerLimit:function(e,t){return(this._serverInfo?this._serverInfo[e]:null)||t},enableLogging:function(e,t){this._loggingEnabled=e,this._trimLongStrings=e&&t},setHumanLanguage:function(e){e&&(this._humanLanguage=e)},isTopicOnline:function(e){const t=this.getMeTopic(),n=t&&t.getContact(e);return n&&n.online},getTopicAccessMode:function(e){const t=this.getMeTopic(),n=t&&t.getContact(e);return n?n.acs:null},wantAkn:function(e){this._messageId=e?Math.floor(16777215*Math.random()+16777215):0},onWebsocketOpen:void 0,onConnect:void 0,onDisconnect:void 0,onLogin:void 0,onCtrlMessage:void 0,onDataMessage:void 0,onPresMessage:void 0,onMessage:void 0,onRawMessage:void 0,onNetworkProbe:void 0,onAutoreconnectIteration:void 0};var S=function(e){this.topic=e;const t=e._tinode.getMeTopic();this.contact=t&&t.getContact(e.name),this.what={}};S.prototype={_get_ims:function(){const e=this.contact&&this.contact.updated,t=this.topic._lastDescUpdate||0;return e>t?e:t},withData:function(e,t,n){return this.what.data={since:e,before:t,limit:n},this},withLaterData:function(e){return this.withData(this.topic._maxSeq>0?this.topic._maxSeq+1:void 0,void 0,e)},withEarlierData:function(e){return this.withData(void 0,this.topic._minSeq>0?this.topic._minSeq:void 0,e)},withDesc:function(e){return this.what.desc={ims:e},this},withLaterDesc:function(){return this.withDesc(this._get_ims())},withSub:function(e,t,n){const s={ims:e,limit:t};return"me"==this.topic.getType()?s.topic=n:s.user=n,this.what.sub=s,this},withOneSub:function(e,t){return this.withSub(e,void 0,t)},withLaterOneSub:function(e){return this.withOneSub(this.topic._lastSubsUpdate,e)},withLaterSub:function(e){return this.withSub(this.topic.isP2P()?this._get_ims():this.topic._lastSubsUpdate,e)},withTags:function(){return this.what.tags=!0,this},withCred:function(){return"me"==this.topic.getType()?this.what.cred=!0:this.topic._tinode.logger("ERROR: Invalid topic type for MetaGetBuilder:withCreds",this.topic.getType()),this},withDel:function(e,t){return(e||t)&&(this.what.del={since:e,limit:t}),this},withLaterDel:function(e){return this.withDel(this.topic._maxSeq>0?this.topic._maxDel+1:void 0,e)},build:function(){const e=[],t=this;let n={};return["data","sub","desc","tags","cred","del"].map((function(s){t.what.hasOwnProperty(s)&&(e.push(s),Object.getOwnPropertyNames(t.what[s]).length>0&&(n[s]=t.what[s]))})),e.length>0?n.what=e.join(" "):n=void 0,n}};var x=function(e){e&&(this.given="number"==typeof e.given?e.given:x.decode(e.given),this.want="number"==typeof e.want?e.want:x.decode(e.want),this.mode=e.mode?"number"==typeof e.mode?e.mode:x.decode(e.mode):this.given&this.want)};x._NONE=0,x._JOIN=1,x._READ=2,x._WRITE=4,x._PRES=8,x._APPROVE=16,x._SHARE=32,x._DELETE=64,x._OWNER=128,x._BITMASK=x._JOIN|x._READ|x._WRITE|x._PRES|x._APPROVE|x._SHARE|x._DELETE|x._OWNER,x._INVALID=1048576,x._checkFlag=function(e,t,n){if(["given","want","mode"].includes(t=t||"mode"))return 0!=(e[t]&n);throw new Error("Invalid AccessMode component '"+t+"'")},x.decode=function(e){if(!e)return null;if("number"==typeof e)return e&x._BITMASK;if("N"===e||"n"===e)return x._NONE;const t={J:x._JOIN,R:x._READ,W:x._WRITE,P:x._PRES,A:x._APPROVE,S:x._SHARE,D:x._DELETE,O:x._OWNER};let n=x._NONE;for(let s=0;s0)){c=!0;break}o=r-1}return c?{idx:r,exact:!0}:s?{idx:-1}:{idx:a<0?r+1:r}}function i(e,t){const n=s(e,t,!1),i=n.exact?1:0;return t.splice(n.idx,i,e),t}return e=e||function(e,t){return e===t?0:e0?n[n.length-1]:void 0},put:function(){let e;e=1==arguments.length&&Array.isArray(arguments[0])?arguments[0]:arguments;for(let t in e)i(e[t],n)},delAt:function(e){let t=n.splice(e,1);if(t&&t.length>0)return t[0]},delRange:function(e,t){return n.splice(e,t-e)},length:function(){return n.length},reset:function(){n=[]},forEach:function(e,t,s,i){t|=0,s=s||n.length;for(let o=t;o{if(e.code>=300)return e;if(this._subscribed=!0,this.acs=e.params&&e.params.acs?e.params.acs:this.acs,this._new){if(this._new=!1,this.name=e.topic,this.created=e.ts,this.updated=e.ts,this._cachePutSelf(),"me"!=this.name&&"fnd"!=this.name){const t=this._tinode.getMeTopic();t&&t._processMetaSub([{_noForwarding:!0,topic:this.name,created:e.ts,updated:e.ts,acs:this.acs}])}t&&t.desc&&(t.desc._noForwarding=!0,this._processMetaDesc(t.desc))}return e})},createMessage:function(e,t){return this._tinode.createMessage(this.name,e,t)},publish:function(e,t){return this.publishMessage(this.createMessage(e,t))},publishMessage:function(e){if(!this._subscribed)return Promise.reject(new Error("Cannot publish on inactive topic"));if(i.hasAttachments(e.content)&&!e.head.attachments){let t=[];i.attachments(e.content,e=>{t.push(e.ref)}),e.head.attachments=t}return e._sending=!0,e._failed=!1,this._tinode.publishMessage(e).then(t=>(e._sending=!1,e.ts=t.ts,this.swapMessageId(e,t.params.seq),this._routeData(e),t)).catch(t=>{this._tinode.logger("WARNING: Message rejected by the server",t),e._sending=!1,e._failed=!0,this.onData&&this.onData()})},publishDraft:function(e,t){if(!t&&!this._subscribed)return Promise.reject(new Error("Cannot publish on inactive topic"));const n=e.seq||this._getQueuedSeqId();return e._noForwarding||(e._noForwarding=!0,e.seq=n,e.ts=new Date,e.from=this._tinode.getCurrentUserID(),e.noecho=!0,this._messages.put(e),this.onData&&this.onData(e)),(t||Promise.resolve()).then(()=>e._cancelled?{code:300,text:"cancelled"}:this.publishMessage(e),t=>{this._tinode.logger("WARNING: Message draft rejected",t),e._sending=!1,e._failed=!0,this._messages.delAt(this._messages.find(e)),this.onData&&this.onData()})},leave:function(e){return this._subscribed||e?this._tinode.leave(this.name,e).then(t=>(this._resetSub(),e&&(this._tinode.cacheDel("topic",this.name),this._gone()),t)):Promise.reject(new Error("Cannot leave inactive topic"))},getMeta:function(e){return this._tinode.getMeta(this.name,e)},getMessagesPage:function(e,t){const n=this.startMetaQuery();t?n.withLaterData(e):n.withEarlierData(e);let s=this.getMeta(n.build());return t||(s=s.then(e=>{e&&e.params&&!e.params.count&&(this._noEarlierMsgs=!0)})),s},setMeta:function(e){return e.tags&&(e.tags=function(e){let t=[];if(Array.isArray(e)){for(let n=0,s=e.length;n1&&t.push(s)}t.sort().filter((function(e,t,n){return!t||e!=n[t-1]}))}return 0==t.length&&t.push(M.DEL_CHAR),t}(e.tags)),this._tinode.setMeta(this.name,e).then(t=>(t&&t.code>=300||(e.sub&&(e.sub.topic=this.name,t.params&&t.params.acs&&(e.sub.acs=t.params.acs,e.sub.updated=t.ts),e.sub.user||(e.sub.user=this._tinode.getCurrentUserID(),e.desc||(e.desc={})),e.sub._noForwarding=!0,this._processMetaSub([e.sub])),e.desc&&(t.params&&t.params.acs&&(e.desc.acs=t.params.acs,e.desc.updated=t.ts),this._processMetaDesc(e.desc)),e.tags&&this._processMetaTags(e.tags),e.cred&&this._processMetaCreds([e.cred],!0)),t))},updateMode:function(e,t){const n=e?this.subscriber(e):null,s=n?n.acs.updateGiven(t).getGiven():this.getAccessMode().updateWant(t).getWant();return this.setMeta({sub:{user:e,mode:s}})},invite:function(e,t){return this.setMeta({sub:{user:e,mode:t}})},archive:function(e){return this.private&&this.private.arch==e?Promise.resolve(e):this.setMeta({desc:{private:{arch:!!e||M.DEL_CHAR}}})},delMessages:function(e,t){if(!this._subscribed)return Promise.reject(new Error("Cannot delete messages in inactive topic"));e.sort((e,t)=>e.low=t.hi));let n,s=e.reduce((e,t)=>(t.low<268435455&&(!t.hi||t.hi<268435455?e.push(t):e.push({low:t.low,hi:this._maxSeq+1})),e),[]);return(n=s.length>0?this._tinode.delMessages(this.name,s,t):Promise.resolve({params:{del:0}})).then(t=>(t.params.del>this._maxDel&&(this._maxDel=t.params.del),e.map(e=>{e.hi?this.flushMessageRange(e.low,e.hi):this.flushMessage(e.low)}),this._updateDeletedRanges(),this.onData&&this.onData(),t))},delMessagesAll:function(e){return!this._maxSeq||this._maxSeq<=0?Promise.resolve():this.delMessages([{low:1,hi:this._maxSeq+1,_all:!0}],e)},delMessagesList:function(e,t){e.sort((e,t)=>e-t);let n=e.reduce((e,t)=>{if(0==e.length)e.push({low:t});else{let n=e[e.length-1];!n.hi&&t!=n.low+1||t>n.hi?e.push({low:t}):n.hi=n.hi?Math.max(n.hi,t+1):t+1}return e},[]);return this.delMessages(n,t)},delTopic:function(e){return this._tinode.delTopic(this.name,e).then(e=>(this._resetSub(),this._gone(),e))},delSubscription:function(e){return this._subscribed?this._tinode.delSubscription(this.name,e).then(t=>(delete this._users[e],this.onSubsUpdated&&this.onSubsUpdated(Object.keys(this._users)),t)):Promise.reject(new Error("Cannot delete subscription in inactive topic"))},note:function(e,t){if(!this._subscribed)return;const n=this._tinode.getMeTopic(),s=this._users[this._tinode.getCurrentUserID()];let i=!1;s?(!s[e]||s[e]0&&this.note("read",e)},noteKeyPress:function(){this._subscribed?this._tinode.noteKeyPress(this.name):this._tinode.logger("INFO: Cannot send notification in inactive topic")},userDesc:function(e){const t=this._cacheGetUser(e);if(t)return t},p2pPeerDesc:function(){if(this.isP2P())return this._users[this.name]},subscribers:function(e,t){const n=e||this.onMetaSub;if(n)for(let e in this._users)n.call(t,this._users[e],e,this._users)},tags:function(){return this._tags.slice(0)},subscriber:function(e){return this._users[e]},messages:function(e,t,n,s){const i=e||this.onData;if(i){let e="number"==typeof t?this._messages.find({seq:t},!0):void 0,o="number"==typeof n?this._messages.find({seq:n},!0):void 0;-1!=e&&-1!=o&&this._messages.forEach(i,e,o,s)}},queuedMessages:function(e,t){if(!e)throw new Error("Callback must be provided");this.messages(e,268435455,void 0,t)},msgReceiptCount:function(e,t){let n=0;if(t>0){const s=this._tinode.getCurrentUserID();for(let i in this._users){const o=this._users[i];o.user!==s&&o[e]>=t&&n++}}return n},msgReadCount:function(e){return this.msgReceiptCount("read",e)},msgRecvCount:function(e){return this.msgReceiptCount("recv",e)},msgHasMoreMessages:function(e){return e?this.seq>this._maxSeq:this._minSeq>1&&!this._noEarlierMsgs},isNewMessage:function(e){return this._maxSeq<=e},flushMessage:function(e){const t=this._messages.find({seq:e});return t>=0?this._messages.delAt(t):void 0},swapMessageId:function(e,t){const n=this._messages.find({seq:e.seq}),s=this._messages.length();e.seq=t,0<=n&&n0&&this._messages.getAt(n-1).seq>=t||n+1=0?this._messages.delRange(n,this._messages.find({seq:t},!0)):[]},cancelSend:function(e){const t=this._messages.find({seq:e});if(t>=0){const e=this._messages.getAt(t),n=this.msgStatus(e);if(1==n||3==n)return e._cancelled=!0,this._messages.delAt(t),this.onData&&this.onData(),!0}return!1},getType:function(){return M.topicType(this.name)},getAccessMode:function(){return this.acs},getDefaultAccess:function(){return this.defacs},startMetaQuery:function(){return new S(this)},isArchived:function(){return!(!this.private||!this.private.arch)},isChannel:function(){return M.isChannelTopicName(this.name)},isGroup:function(){return M.isGroupTopicName(this.name)},isP2P:function(){return M.isP2PTopicName(this.name)},msgStatus:function(e){let t=0;return this._tinode.isMe(e.from)?e._sending?t=2:e._failed||e._cancelled?t=3:e.seq>=268435455?t=1:this.msgReadCount(e.seq)>0?t=6:this.msgRecvCount(e.seq)>0?t=5:e.seq>0&&(t=4):t=7,t},_routeData:function(e){e.content&&(!this.touched||this.touchedthis._maxSeq&&(this._maxSeq=e.seq),(e.seq0&&(this._lastSubsUpdate=e.ts,this._processMetaSub(e.sub)),e.del&&this._processDelMessages(e.del.clear,e.del.delseq),e.tags&&this._processMetaTags(e.tags),e.cred&&this._processMetaCreds(e.cred),this.onMeta&&this.onMeta(e)},_routePres:function(e){let t;switch(e.what){case"del":this._processDelMessages(e.clear,e.delseq);break;case"on":case"off":(t=this._users[e.src])?t.online="on"==e.what:this._tinode.logger("WARNING: Presence update for an unknown user",this.name,e.src);break;case"term":this._resetSub();break;case"acs":const n=e.src||this._tinode.getCurrentUserID();if(t=this._users[n])t.acs.updateAll(e.dacs),this._processMetaSub([{user:n,updated:new Date,acs:t.acs}]);else{const s=(new x).updateAll(e.dacs);s&&s.mode!=x._NONE&&((t=this._cacheGetUser(n))?t.acs=s:(t={user:n,acs:s},this.getMeta(this.startMetaQuery().withOneSub(void 0,n).build())),t.updated=new Date,this._processMetaSub([t]))}break;default:this._tinode.logger("INFO: Ignored presence update",e.what)}this.onPres&&this.onPres(e)},_routeInfo:function(e){if("kp"!==e.what){const t=this._users[e.from];if(t&&(t[e.what]=e.seq,t.recv0&&(this._updateDeletedRanges(),this.onData&&this.onData())},_allMessagesReceived:function(e){this._updateDeletedRanges(),this.onAllMessagesReceived&&this.onAllMessagesReceived(e)},_resetSub:function(){this._subscribed=!1},_gone:function(){this._messages.reset(),this._users={},this.acs=new x(null),this.private=null,this.public=null,this._maxSeq=0,this._minSeq=0,this._subscribed=!1;const e=this._tinode.getMeTopic();e&&e._routePres({_noForwarding:!0,what:"gone",topic:"me",src:this.name}),this.onDeleteTopic&&this.onDeleteTopic()},_updateCachedUser:function(e,t){let n=this._cacheGetUser(e);return n=p(n||{},t),this._cachePutUser(e,n),g(this._users,e,n)},_getQueuedSeqId:function(){return this._queuedSeqId++},_updateDeletedRanges:function(){const e=[];let t=null;const n=this._messages.getAt(0);n&&this._minSeq>1&&!this._noEarlierMsgs?n.hi?(n.seq>1&&(n.seq=1),n.hi{n.seq>=268435455||(n.seq!=(t.hi||t.seq)+1?t.hi?t.hi=n.hi||n.seq:(t={seq:(t.hi||t.seq)+1,hi:n.hi||n.seq},e.push(t)):t=n)});const s=this._messages.getLast(),i=Math.max(this.seq,this._maxSeq)||0;(i>0&&!s||s&&(s.hi||s.seq){this._messages.put(e)})}};var y=function(e){T.call(this,"me",e),this._contacts={},e&&(this.onContactUpdate=e.onContactUpdate)};y.prototype=Object.create(T.prototype,{_processMetaDesc:{value:function(e){const t=e.acs&&!e.acs.isPresencer()&&this.acs&&this.acs.isPresencer();p(this,e),m(this),t&&Object.values(this._contacts).map(e=>{e.online&&(e.online=!1,e.seen?e.seen.when=new Date:e.seen={when:new Date},this.onContactUpdate&&this.onContactUpdate("off",e))}),this.onMetaDesc&&this.onMetaDesc(this)},enumerable:!0,configurable:!0,writable:!1},_processMetaSub:{value:function(e){let t=0;for(let n in e){const s=e[n],i=s.topic;if("fnd"==i||"me"==i)continue;s.updated=new Date(s.updated),s.touched=s.touched?new Date(s.touched):void 0,s.deleted=s.deleted?new Date(s.deleted):null;let o=null;if(s.deleted)o=s,delete this._contacts[i];else if(void 0!==s.seq&&(s.seq=0|s.seq,s.recv=0|s.recv,s.read=0|s.read,s.unread=s.seq-s.read),s.seen&&s.seen.when&&(s.seen.when=new Date(s.seen.when)),o=g(this._contacts,i,s),M.isP2PTopicName(i)&&this._cachePutUser(i,o),!s._noForwarding){const e=this._tinode.getTopic(i);e&&(s._noForwarding=!0,e._processMetaDesc(s))}t++,this.onMetaSub&&this.onMetaSub(o)}this.onSubsUpdated&&this.onSubsUpdated(Object.keys(this._contacts),t)},enumerable:!0,configurable:!0,writable:!1},_processMetaCreds:{value:function(e,t){1==e.length&&e[0]==M.DEL_CHAR&&(e=[]),t?e.map(e=>{if(e.val){let t=this._credentials.findIndex(t=>t.meth==e.meth&&t.val==e.val);t<0?(e.done||(t=this._credentials.findIndex(t=>t.meth==e.meth&&!t.done))>=0&&this._credentials.splice(t,1),this._credentials.push(e)):this._credentials[t].done=e.done}else if(e.resp){const t=this._credentials.findIndex(t=>t.meth==e.meth&&!t.done);t>=0&&(this._credentials[t].done=!0)}}):this._credentials=e,this.onCredsUpdated&&this.onCredsUpdated(this._credentials)},enumerable:!0,configurable:!0,writable:!1},_routePres:{value:function(e){if("term"==e.what)return void this._resetSub();if("upd"==e.what&&"me"==e.src)return void this.getMeta(this.startMetaQuery().withDesc().build());const t=this._contacts[e.src];if(t){switch(e.what){case"on":t.online=!0;break;case"off":t.online&&(t.online=!1,t.seen?t.seen.when=new Date:t.seen={when:new Date});break;case"msg":t.touched=new Date,t.seq=0|e.seq,e.act&&!this._tinode.isMe(e.act)||(t.read=t.read?Math.max(t.read,t.seq):t.seq,t.recv=t.recv?Math.max(t.read,t.recv):t.read),t.unread=t.seq-(0|t.read);break;case"upd":this.getMeta(this.startMetaQuery().withLaterOneSub(e.src).build());break;case"acs":t.acs?t.acs.updateAll(e.dacs):t.acs=(new x).updateAll(e.dacs),t.touched=new Date;break;case"ua":t.seen={when:new Date,ua:e.ua};break;case"recv":e.seq=0|e.seq,t.recv=t.recv?Math.max(t.recv,e.seq):e.seq;break;case"read":e.seq=0|e.seq,t.read=t.read?Math.max(t.read,e.seq):e.seq,t.recv=t.recv?Math.max(t.read,t.recv):t.recv,t.unread=t.seq-t.read;break;case"gone":delete this._contacts[e.src];break;case"del":break;default:this._tinode.logger("INFO: Unsupported presence update in 'me'",e.what)}this.onContactUpdate&&this.onContactUpdate(e.what,t)}else if("acs"==e.what){const t=new x(e.dacs);if(!t||t.mode==x._INVALID)return void this._tinode.logger("ERROR: Invalid access mode update",e.src,e.dacs);if(t.mode==x._NONE)return void this._tinode.logger("WARNING: Removing non-existent subscription",e.src,e.dacs);this.getMeta(this.startMetaQuery().withOneSub(void 0,e.src).build()),this._contacts[e.src]={touched:new Date,topic:e.src,online:!1,acs:t}}else"tags"==e.what&&this.getMeta(this.startMetaQuery().withTags().build());this.onPres&&this.onPres(e)},enumerable:!0,configurable:!0,writable:!1},publish:{value:function(){return Promise.reject(new Error("Publishing to 'me' is not supported"))},enumerable:!0,configurable:!0,writable:!1},delCredential:{value:function(e,t){return this._subscribed?this._tinode.delCredential(e,t).then(n=>{const s=this._credentials.findIndex(n=>n.meth==e&&n.val==t);return s>-1&&this._credentials.splice(s,1),this.onCredsUpdated&&this.onCredsUpdated(this._credentials),n}):Promise.reject(new Error("Cannot delete credential in inactive 'me' topic"))},enumerable:!0,configurable:!0,writable:!1},contacts:{value:function(e,t,n){for(let s in this._contacts){const i=this._contacts[s];t&&!t(i)||e.call(n,i,s,this._contacts)}},enumerable:!0,configurable:!0,writable:!0},setMsgReadRecv:{value:function(e,t,n,s){const i=this._contacts[e];let o,r=!1;if(i){switch(n|=0,i.seq=0|i.seq,i.read=0|i.read,i.recv=0|i.recv,t){case"recv":o=i.recv,i.recv=Math.max(i.recv,n),r=o!=i.recv;break;case"read":o=i.read,i.read=Math.max(i.read,n),r=o!=i.read;break;case"msg":o=i.seq,i.seq=Math.max(i.seq,n),(!i.touched||i.touched0&&this.onSubsUpdated&&this.onSubsUpdated(Object.keys(this._contacts))},enumerable:!0,configurable:!0,writable:!1},publish:{value:function(){return Promise.reject(new Error("Publishing to 'fnd' is not supported"))},enumerable:!0,configurable:!0,writable:!1},setMeta:{value:function(e){const t=this;return Object.getPrototypeOf(D.prototype).setMeta.call(this,e).then((function(){Object.keys(t._contacts).length>0&&(t._contacts={},t.onSubsUpdated&&t.onSubsUpdated([]))}))},enumerable:!0,configurable:!0,writable:!1},contacts:{value:function(e,t){const n=e||this.onMetaSub;if(n)for(let e in this._contacts)n.call(t,this._contacts[e],e,this._contacts)},enumerable:!0,configurable:!0,writable:!0}}),D.prototype.constructor=D;var R=function(e){this._tinode=e,this._apiKey=e._apiKey,this._authToken=e.getAuthToken(),this._msgId=e.getNextUniqueId(),this.xhr=new XMLHttpRequest,this.toResolve=null,this.toReject=null,this.onProgress=null,this.onSuccess=null,this.onFailure=null};R.prototype={uploadWithBaseUrl:function(e,t,n,s,i){if(!this._authToken)throw new Error("Must authenticate first");const o=this;let r="/v0/file/u/";if(e){if(0!=e.indexOf("http://")&&0!=e.indexOf("https://"))throw new Error("Invalid base URL '"+e+"'");r=e+r}this.xhr.open("POST",r,!0),this.xhr.setRequestHeader("X-Tinode-APIKey",this._apiKey),this.xhr.setRequestHeader("X-Tinode-Auth","Token "+this._authToken.token);const a=new Promise((e,t)=>{this.toResolve=e,this.toReject=t});this.onProgress=n,this.onSuccess=s,this.onFailure=i,this.xhr.upload.onprogress=e=>{e.lengthComputable&&o.onProgress&&o.onProgress(e.loaded/e.total)},this.xhr.onload=function(){let e;try{e=JSON.parse(this.response,_)}catch(t){o._tinode.logger("ERROR: Invalid server response in LargeFileHelper",this.response),e={ctrl:{code:this.status,text:this.statusText}}}this.status>=200&&this.status<300?(o.toResolve&&o.toResolve(e.ctrl.params.url),o.onSuccess&&o.onSuccess(e.ctrl)):this.status>=400?(o.toReject&&o.toReject(new Error(e.ctrl.text+" ("+e.ctrl.code+")")),o.onFailure&&o.onFailure(e.ctrl)):o._tinode.logger("ERROR: Unexpected server response status",this.status,this.response)},this.xhr.onerror=function(e){o.toReject&&o.toReject(new 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Call 'Tinode.setNetworkProviders()'.");this.transportAvailable=function(e){switch(e){case"ws":return"object"==typeof window&&window.WebSocket;case"lp":return"object"==typeof window&&window.XMLHttpRequest;default:return console.log("Request for unknown transport",e),!1}},this.backoffReset=function(){p=0},this.onMessage=void 0,this.onDisconnect=void 0,this.onOpen=void 0,this.onAutoreconnectIteration=void 0,this.logger=void 0},M=function(e,t,n,s,i,o){this._appName=e||"Undefined",this._apiKey=n,this._browser="",this._platform=o,this._hwos="undefined",this._humanLanguage="xx","undefined"!=typeof navigator&&(this._browser=function(e,t){e=e||"";let n="";/reactnative/i.test(t)&&(n="ReactNative; ");let s,i=(e=e.replace(" (KHTML, like Gecko)","")).match(/(AppleWebKit\/[.\d]+)/i);if(i){let t=["chrome","safari","mobile","version"],n=e.substr(i.index+i[0].length).split(" "),o=[];for(let e=0;e0?o[0][0]+"/"+o[0][1]:i[1]}else s=/trident/i.test(e)?(i=/(?:\brv[ :]+([.\d]+))|(?:\bMSIE ([.\d]+))/g.exec(e))?"MSIE/"+(i[1]||i[2]):"MSIE/?":/firefox/i.test(e)?(i=/Firefox\/([.\d]+)/g.exec(e))?"Firefox/"+i[1]:"Firefox/?":/presto/i.test(e)?(i=/Opera\/([.\d]+)/g.exec(e))?"Opera/"+i[1]:"Opera/?":(i=/([\w.]+)\/([.\d]+)/.exec(e))?i[1]+"/"+i[2]:(i=e.split(" "))[0];if((i=s.split("/")).length>1){let e=i[1].split(".");s=i[0]+"/"+e[0]+(e[1]?"."+e[1]:"")}return n+s}(navigator.userAgent,navigator.product),this._hwos=navigator.platform,this._humanLanguage=navigator.language||"en-US"),this._loggingEnabled=!1,this._trimLongStrings=!1,this._myUID=null,this._authenticated=!1,this._login=null,this._authToken=null,this._inPacketCount=0,this._messageId=Math.floor(65535*Math.random()+65535),this._serverInfo=null,this._deviceToken=null,this._pendingPromises={},this._expirePromises=null,this._connection=new v(t,n,s,i,!0),this.logger=(e,...t)=>{if(this._loggingEnabled){const n=new Date,s=("0"+n.getUTCHours()).slice(-2)+":"+("0"+n.getUTCMinutes()).slice(-2)+":"+("0"+n.getUTCSeconds()).slice(-2)+"."+("00"+n.getUTCMilliseconds()).slice(-3);console.log("["+s+"]",e,t.join(" "))}},this._connection.logger=this.logger,this._cache={};const r=this.cachePut=(e,t,n)=>{this._cache[e+":"+t]=n},a=this.cacheGet=(e,t)=>this._cache[e+":"+t],h=this.cacheDel=(e,t)=>{delete this._cache[e+":"+t]},l=this.cacheMap=(e,t)=>{for(let n in this._cache)if(e(this._cache[n],n,t))break};this.attachCacheToTopic=e=>{e._tinode=this,e._cacheGetUser=e=>{const t=a("user",e);if(t)return{user:e,public:p({},t)}},e._cachePutUser=(e,t)=>r("user",e,p({},t.public)),e._cacheDelUser=e=>h("user",e),e._cachePutSelf=()=>r("topic",e.name,e),e._cacheDelSelf=()=>h("topic",e.name)};const d=(e,t,n,s)=>{const i=this._pendingPromises[e];i&&(delete this._pendingPromises[e],t>=200&&t<400?i.resolve&&i.resolve(n):i.reject&&i.reject(new Error(s+" ("+t+")")))},f=e=>{let t=null;return e&&(t=new Promise((t,n)=>{this._pendingPromises[e]={resolve:t,reject:n,ts:new Date}})),t},g=this.getNextUniqueId=()=>0!=this._messageId?""+this._messageId++:void 0,m=()=>this._appName+" ("+(this._browser?this._browser+"; ":"")+this._hwos+"); "+u;this.initPacket=(e,t)=>{switch(e){case"hi":return{hi:{id:g(),ver:c,ua:m(),dev:this._deviceToken,lang:this._humanLanguage,platf:this._platform}};case"acc":return{acc:{id:g(),user:null,scheme:null,secret:null,login:!1,tags:null,desc:{},cred:{}}};case"login":return{login:{id:g(),scheme:null,secret:null}};case"sub":return{sub:{id:g(),topic:t,set:{},get:{}}};case"leave":return{leave:{id:g(),topic:t,unsub:!1}};case"pub":return{pub:{id:g(),topic:t,noecho:!1,head:null,content:{}}};case"get":return{get:{id:g(),topic:t,what:null,desc:{},sub:{},data:{}}};case"set":return{set:{id:g(),topic:t,desc:{},sub:{},tags:[]}};case"del":return{del:{id:g(),topic:t,what:null,delseq:null,user:null,hard:!1}};case"note":return{note:{topic:t,what:null,seq:void 0}};default:throw new Error("Unknown packet type requested: "+e)}},this.send=(e,t)=>{let n;t&&(n=f(t)),e=function e(t){return Object.keys(t).forEach((function(n){"_"==n[0]?delete t[n]:t[n]?Array.isArray(t[n])&&0==t[n].length?delete t[n]:t[n]?"object"!=typeof t[n]||t[n]instanceof Date||(e(t[n]),0==Object.getOwnPropertyNames(t[n]).length&&delete t[n]):delete t[n]:delete t[n]})),t}(e);let s=JSON.stringify(e);this.logger("out: "+(this._trimLongStrings?JSON.stringify(e,b):s));try{this._connection.sendText(s)}catch(e){if(!t)throw e;d(t,503,null,e.message)}return n},this.loginSuccessful=e=>{e.params&&e.params.user&&(this._myUID=e.params.user,this._authenticated=e&&e.code>=200&&e.code<300,e.params&&e.params.token&&e.params.expires?this._authToken={token:e.params.token,expires:new Date(e.params.expires)}:this._authToken=null,this.onLogin&&this.onLogin(e.code,e.text))},this._connection.onMessage=e=>{if(!e)return;if(this._inPacketCount++,this.onRawMessage&&this.onRawMessage(e),"0"===e)return void(this.onNetworkProbe&&this.onNetworkProbe());let t=JSON.parse(e,_);t?(this.logger("in: "+(this._trimLongStrings?JSON.stringify(t,b):e)),this.onMessage&&this.onMessage(t),t.ctrl?(this.onCtrlMessage&&this.onCtrlMessage(t.ctrl),t.ctrl.id&&d(t.ctrl.id,t.ctrl.code,t.ctrl,t.ctrl.text),setTimeout(()=>{if(205==t.ctrl.code&&"evicted"==t.ctrl.text){const e=a("topic",t.ctrl.topic);e&&(e._resetSub(),t.ctrl.params&&t.ctrl.params.unsub&&e._gone())}else if(t.ctrl.params&&"data"==t.ctrl.params.what){const e=a("topic",t.ctrl.topic);e&&e._allMessagesReceived(t.ctrl.params.count)}else if(t.ctrl.params&&"sub"==t.ctrl.params.what){const e=a("topic",t.ctrl.topic);e&&e._processMetaSub([])}},0)):setTimeout(()=>{if(t.meta){const e=a("topic",t.meta.topic);e&&e._routeMeta(t.meta),t.meta.id&&d(t.meta.id,200,t.meta,"META"),this.onMetaMessage&&this.onMetaMessage(t.meta)}else if(t.data){const e=a("topic",t.data.topic);e&&e._routeData(t.data),this.onDataMessage&&this.onDataMessage(t.data)}else if(t.pres){const e=a("topic",t.pres.topic);e&&e._routePres(t.pres),this.onPresMessage&&this.onPresMessage(t.pres)}else if(t.info){const e=a("topic",t.info.topic);e&&e._routeInfo(t.info),this.onInfoMessage&&this.onInfoMessage(t.info)}else this.logger("ERROR: Unknown packet received.")},0)):(this.logger("in: "+e),this.logger("ERROR: failed to parse data"))},this._connection.onOpen=()=>{this._expirePromises||(this._expirePromises=setInterval(()=>{const e=new Error("Timeout (504)"),t=new Date((new Date).getTime()-5e3);for(let n in this._pendingPromises){let s=this._pendingPromises[n];s&&s.ts{this.onAutoreconnectIteration&&this.onAutoreconnectIteration(e,t)},this._connection.onDisconnect=(e,t)=>{this._inPacketCount=0,this._serverInfo=null,this._authenticated=!1,this._expirePromises&&(clearInterval(this._expirePromises),this._expirePromises=null),l((e,t)=>{0===t.lastIndexOf("topic:",0)&&e._resetSub()});for(let t in this._pendingPromises){let n=this._pendingPromises[t];n&&n.reject&&n.reject(e)}this._pendingPromises={},this.onDisconnect&&this.onDisconnect(e)}};M.credential=function(e,t,n,s){return"object"==typeof e&&({val:t,params:n,resp:s,meth:e}=e),e&&(t||s)?[{meth:e,val:t,resp:s,params:n}]:null},M.topicType=function(e){return{me:"me",fnd:"fnd",grp:"grp",new:"grp",nch:"grp",chn:"grp",usr:"p2p",sys:"sys"}["string"==typeof e?e.substring(0,3):"xxx"]},M.isGroupTopicName=function(e){return"grp"===M.topicType(e)},M.isP2PTopicName=function(e){return"p2p"===M.topicType(e)},M.isNewGroupTopicName=function(e){return"string"==typeof e&&("new"==e.substring(0,3)||"nch"==e.substring(0,3))},M.isChannelTopicName=function(e){return"string"==typeof e&&("chn"==e.substring(0,3)||"nch"==e.substring(0,3))},M.getVersion=function(){return c},M.setNetworkProviders=function(e,t){r=e,a=t},M.getLibrary=function(){return u},M.MESSAGE_STATUS_NONE=0,M.MESSAGE_STATUS_QUEUED=1,M.MESSAGE_STATUS_SENDING=2,M.MESSAGE_STATUS_FAILED=3,M.MESSAGE_STATUS_SENT=4,M.MESSAGE_STATUS_RECEIVED=5,M.MESSAGE_STATUS_READ=6,M.MESSAGE_STATUS_TO_ME=7,M.DEL_CHAR="␡",M.isNullValue=function(e){return e===M.DEL_CHAR},M.isRelativeURL=function(e){return!/^\s*([a-z][a-z0-9+.-]*:|\/\/)/im.test(e)},M.MAX_MESSAGE_SIZE="maxMessageSize",M.MAX_SUBSCRIBER_COUNT="maxSubscriberCount",M.MAX_TAG_COUNT="maxTagCount",M.MAX_FILE_UPLOAD_SIZE="maxFileUploadSize",M.prototype={connect:function(e){return this._connection.connect(e)},reconnect:function(e){this._connection.reconnect(e)},disconnect:function(){this._connection.disconnect()},networkProbe:function(){this._connection.probe()},isConnected:function(){return this._connection.isConnected()},isAuthenticated:function(){return this._authenticated},authorizeURL:function(e){if(!e)return e;if(M.isRelativeURL(e)){const t="scheme://host/",n=new URL(e,t);this._apiKey&&n.searchParams.append("apikey",this._apiKey),this._authToken.token&&(n.searchParams.append("auth","token"),n.searchParams.append("secret",this._authToken.token)),e=n.toString().substring(t.length-1)}return e},account:function(e,t,n,s,i){const o=this.initPacket("acc");return o.acc.user=e,o.acc.scheme=t,o.acc.secret=n,o.acc.login=s,i&&(o.acc.desc.defacs=i.defacs,o.acc.desc.public=i.public,o.acc.desc.private=i.private,o.acc.tags=i.tags,o.acc.cred=i.cred,o.acc.token=i.token),this.send(o,o.acc.id)},createAccount:function(e,t,n,s){let i=this.account("new",e,t,n,s);return n&&(i=i.then(e=>(this.loginSuccessful(e),e))),i},createAccountBasic:function(e,t,n){return e=e||"",t=t||"",this.createAccount("basic",f(e+":"+t),!0,n)},updateAccountBasic:function(e,t,n,s){return t=t||"",n=n||"",this.account(e,"basic",f(t+":"+n),!1,s)},hello:function(){const e=this.initPacket("hi");return this.send(e,e.hi.id).then(e=>(this._connection.backoffReset(),e.params&&(this._serverInfo=e.params),this.onConnect&&this.onConnect(),e)).catch(e=>{this._connection.reconnect(!0),this.onDisconnect&&this.onDisconnect(e)})},setDeviceToken:function(e,t){let n=!1;return e&&e!=this._deviceToken&&(this._deviceToken=e,t&&this.isConnected()&&this.isAuthenticated()&&(this.send({hi:{dev:e}}),n=!0)),n},login:function(e,t,n){const s=this.initPacket("login");return s.login.scheme=e,s.login.secret=t,s.login.cred=n,this.send(s,s.login.id).then(e=>(this.loginSuccessful(e),e))},loginBasic:function(e,t,n){return this.login("basic",f(e+":"+t),n).then(t=>(this._login=e,t))},loginToken:function(e,t){return this.login("token",e,t)},requestResetAuthSecret:function(e,t,n){return this.login("reset",f(e+":"+t+":"+n))},getAuthToken:function(){return this._authToken&&this._authToken.expires.getTime()>Date.now()?this._authToken:(this._authToken=null,null)},setAuthToken:function(e){this._authToken=e},subscribe:function(e,t,n){const s=this.initPacket("sub",e);return e||(e="new"),s.sub.get=t,n&&(n.sub&&(s.sub.set.sub=n.sub),n.desc&&(M.isNewGroupTopicName(e)?s.sub.set.desc=n.desc:M.isP2PTopicName(e)&&n.desc.defacs&&(s.sub.set.desc={defacs:n.desc.defacs})),n.tags&&(s.sub.set.tags=n.tags)),this.send(s,s.sub.id)},leave:function(e,t){const n=this.initPacket("leave",e);return n.leave.unsub=t,this.send(n,n.leave.id)},createMessage:function(e,t,n){const s=this.initPacket("pub",e);let o="string"==typeof t?i.parse(t):t;return o&&!i.isPlainText(o)&&(s.pub.head={mime:i.getContentType()},t=o),s.pub.noecho=n,s.pub.content=t,s.pub},publish:function(e,t,n){return this.publishMessage(this.createMessage(e,t,n))},publishMessage:function(e){return(e=Object.assign({},e)).seq=void 0,e.from=void 0,e.ts=void 0,this.send({pub:e},e.id)},getMeta:function(e,t){const n=this.initPacket("get",e);return n.get=p(n.get,t),this.send(n,n.get.id)},setMeta:function(e,t){const n=this.initPacket("set",e),s=[];return t&&["desc","sub","tags","cred"].map((function(e){t.hasOwnProperty(e)&&(s.push(e),n.set[e]=t[e])})),0==s.length?Promise.reject(new Error("Invalid {set} parameters")):this.send(n,n.set.id)},delMessages:function(e,t,n){const s=this.initPacket("del",e);return s.del.what="msg",s.del.delseq=t,s.del.hard=n,this.send(s,s.del.id)},delTopic:function(e,t){const n=this.initPacket("del",e);return n.del.what="topic",n.del.hard=t,this.send(n,n.del.id).then(t=>(this.cacheDel("topic",e),this.ctrl))},delSubscription:function(e,t){const n=this.initPacket("del",e);return n.del.what="sub",n.del.user=t,this.send(n,n.del.id)},delCredential:function(e,t){const n=this.initPacket("del","me");return n.del.what="cred",n.del.cred={meth:e,val:t},this.send(n,n.del.id)},delCurrentUser:function(e){const t=this.initPacket("del",null);return t.del.what="user",t.del.hard=e,this.send(t,t.del.id).then(e=>{this._myUID=null})},note:function(e,t,n){if(n<=0||n>=268435455)throw new Error("Invalid message id "+n);const s=this.initPacket("note",e);s.note.what=t,s.note.seq=n,this.send(s)},noteKeyPress:function(e){const t=this.initPacket("note",e);t.note.what="kp",this.send(t)},getTopic:function(e){let t=this.cacheGet("topic",e);return!t&&e&&(t="me"==e?new y:"fnd"==e?new D:new T(e),this.cachePut("topic",e,t),this.attachCacheToTopic(t)),t},isTopicCached:function(e){return!!this.cacheGet("topic",e)},newTopic:function(e){const t=new T("new",e);return this.attachCacheToTopic(t),t},newChannel:function(e){const t=new T("nch",e);return this.attachCacheToTopic(t),t},newGroupTopicName:function(e){return(e?"nch":"new")+this.getNextUniqueId()},newTopicWith:function(e,t){const n=new T(e,t);return this.attachCacheToTopic(n),n},getMeTopic:function(){return this.getTopic("me")},getFndTopic:function(){return this.getTopic("fnd")},getLargeFileHelper:function(){return new R(this)},getCurrentUserID:function(){return this._myUID},isMe:function(e){return this._myUID===e},getCurrentLogin:function(){return this._login},getServerInfo:function(){return this._serverInfo},getServerLimit:function(e,t){return(this._serverInfo?this._serverInfo[e]:null)||t},enableLogging:function(e,t){this._loggingEnabled=e,this._trimLongStrings=e&&t},setHumanLanguage:function(e){e&&(this._humanLanguage=e)},isTopicOnline:function(e){const t=this.getMeTopic(),n=t&&t.getContact(e);return n&&n.online},getTopicAccessMode:function(e){const t=this.getMeTopic(),n=t&&t.getContact(e);return n?n.acs:null},wantAkn:function(e){this._messageId=e?Math.floor(16777215*Math.random()+16777215):0},onWebsocketOpen:void 0,onConnect:void 0,onDisconnect:void 0,onLogin:void 0,onCtrlMessage:void 0,onDataMessage:void 0,onPresMessage:void 0,onMessage:void 0,onRawMessage:void 0,onNetworkProbe:void 0,onAutoreconnectIteration:void 0};var S=function(e){this.topic=e;const t=e._tinode.getMeTopic();this.contact=t&&t.getContact(e.name),this.what={}};S.prototype={_get_ims:function(){const e=this.contact&&this.contact.updated,t=this.topic._lastDescUpdate||0;return e>t?e:t},withData:function(e,t,n){return this.what.data={since:e,before:t,limit:n},this},withLaterData:function(e){return this.withData(this.topic._maxSeq>0?this.topic._maxSeq+1:void 0,void 0,e)},withEarlierData:function(e){return this.withData(void 0,this.topic._minSeq>0?this.topic._minSeq:void 0,e)},withDesc:function(e){return this.what.desc={ims:e},this},withLaterDesc:function(){return this.withDesc(this._get_ims())},withSub:function(e,t,n){const s={ims:e,limit:t};return"me"==this.topic.getType()?s.topic=n:s.user=n,this.what.sub=s,this},withOneSub:function(e,t){return this.withSub(e,void 0,t)},withLaterOneSub:function(e){return this.withOneSub(this.topic._lastSubsUpdate,e)},withLaterSub:function(e){return this.withSub(this.topic.isP2P()?this._get_ims():this.topic._lastSubsUpdate,e)},withTags:function(){return this.what.tags=!0,this},withCred:function(){return"me"==this.topic.getType()?this.what.cred=!0:this.topic._tinode.logger("ERROR: Invalid topic type for MetaGetBuilder:withCreds",this.topic.getType()),this},withDel:function(e,t){return(e||t)&&(this.what.del={since:e,limit:t}),this},withLaterDel:function(e){return this.withDel(this.topic._maxSeq>0?this.topic._maxDel+1:void 0,e)},build:function(){const e=[],t=this;let n={};return["data","sub","desc","tags","cred","del"].map((function(s){t.what.hasOwnProperty(s)&&(e.push(s),Object.getOwnPropertyNames(t.what[s]).length>0&&(n[s]=t.what[s]))})),e.length>0?n.what=e.join(" "):n=void 0,n}};var x=function(e){e&&(this.given="number"==typeof e.given?e.given:x.decode(e.given),this.want="number"==typeof e.want?e.want:x.decode(e.want),this.mode=e.mode?"number"==typeof e.mode?e.mode:x.decode(e.mode):this.given&this.want)};x._NONE=0,x._JOIN=1,x._READ=2,x._WRITE=4,x._PRES=8,x._APPROVE=16,x._SHARE=32,x._DELETE=64,x._OWNER=128,x._BITMASK=x._JOIN|x._READ|x._WRITE|x._PRES|x._APPROVE|x._SHARE|x._DELETE|x._OWNER,x._INVALID=1048576,x._checkFlag=function(e,t,n){if(["given","want","mode"].includes(t=t||"mode"))return 0!=(e[t]&n);throw new Error("Invalid AccessMode component '"+t+"'")},x.decode=function(e){if(!e)return null;if("number"==typeof e)return e&x._BITMASK;if("N"===e||"n"===e)return x._NONE;const t={J:x._JOIN,R:x._READ,W:x._WRITE,P:x._PRES,A:x._APPROVE,S:x._SHARE,D:x._DELETE,O:x._OWNER};let n=x._NONE;for(let s=0;s0)){c=!0;break}o=r-1}return c?{idx:r,exact:!0}:s?{idx:-1}:{idx:a<0?r+1:r}}function i(e,t){const n=s(e,t,!1),i=n.exact?1:0;return t.splice(n.idx,i,e),t}return e=e||function(e,t){return e===t?0:e0?n[n.length-1]:void 0},put:function(){let e;e=1==arguments.length&&Array.isArray(arguments[0])?arguments[0]:arguments;for(let t in e)i(e[t],n)},delAt:function(e){let t=n.splice(e,1);if(t&&t.length>0)return t[0]},delRange:function(e,t){return n.splice(e,t-e)},length:function(){return n.length},reset:function(){n=[]},forEach:function(e,t,s,i){t|=0,s=s||n.length;for(let o=t;o{if(e.code>=300)return e;if(this._subscribed=!0,this.acs=e.params&&e.params.acs?e.params.acs:this.acs,this._new){if(this._new=!1,this.name=e.topic,this.created=e.ts,this.updated=e.ts,this._cachePutSelf(),"me"!=this.name&&"fnd"!=this.name){const t=this._tinode.getMeTopic();t&&t._processMetaSub([{_noForwarding:!0,topic:this.name,created:e.ts,updated:e.ts,acs:this.acs}])}t&&t.desc&&(t.desc._noForwarding=!0,this._processMetaDesc(t.desc))}return e})},createMessage:function(e,t){return this._tinode.createMessage(this.name,e,t)},publish:function(e,t){return this.publishMessage(this.createMessage(e,t))},publishMessage:function(e){if(!this._subscribed)return Promise.reject(new Error("Cannot publish on inactive topic"));if(i.hasAttachments(e.content)&&!e.head.attachments){let t=[];i.attachments(e.content,e=>{t.push(e.ref)}),e.head.attachments=t}return e._sending=!0,e._failed=!1,this._tinode.publishMessage(e).then(t=>(e._sending=!1,e.ts=t.ts,this.swapMessageId(e,t.params.seq),this._routeData(e),t)).catch(t=>{this._tinode.logger("WARNING: Message rejected by the server",t),e._sending=!1,e._failed=!0,this.onData&&this.onData()})},publishDraft:function(e,t){if(!t&&!this._subscribed)return Promise.reject(new Error("Cannot publish on inactive topic"));const n=e.seq||this._getQueuedSeqId();return e._noForwarding||(e._noForwarding=!0,e.seq=n,e.ts=new Date,e.from=this._tinode.getCurrentUserID(),e.noecho=!0,this._messages.put(e),this.onData&&this.onData(e)),(t||Promise.resolve()).then(()=>e._cancelled?{code:300,text:"cancelled"}:this.publishMessage(e),t=>{this._tinode.logger("WARNING: Message draft rejected",t),e._sending=!1,e._failed=!0,this._messages.delAt(this._messages.find(e)),this.onData&&this.onData()})},leave:function(e){return this._subscribed||e?this._tinode.leave(this.name,e).then(t=>(this._resetSub(),e&&(this._tinode.cacheDel("topic",this.name),this._gone()),t)):Promise.reject(new Error("Cannot leave inactive topic"))},getMeta:function(e){return this._tinode.getMeta(this.name,e)},getMessagesPage:function(e,t){const n=this.startMetaQuery();t?n.withLaterData(e):n.withEarlierData(e);let s=this.getMeta(n.build());return t||(s=s.then(e=>{e&&e.params&&!e.params.count&&(this._noEarlierMsgs=!0)})),s},setMeta:function(e){return e.tags&&(e.tags=function(e){let t=[];if(Array.isArray(e)){for(let n=0,s=e.length;n1&&t.push(s)}t.sort().filter((function(e,t,n){return!t||e!=n[t-1]}))}return 0==t.length&&t.push(M.DEL_CHAR),t}(e.tags)),this._tinode.setMeta(this.name,e).then(t=>(t&&t.code>=300||(e.sub&&(e.sub.topic=this.name,t.params&&t.params.acs&&(e.sub.acs=t.params.acs,e.sub.updated=t.ts),e.sub.user||(e.sub.user=this._tinode.getCurrentUserID(),e.desc||(e.desc={})),e.sub._noForwarding=!0,this._processMetaSub([e.sub])),e.desc&&(t.params&&t.params.acs&&(e.desc.acs=t.params.acs,e.desc.updated=t.ts),this._processMetaDesc(e.desc)),e.tags&&this._processMetaTags(e.tags),e.cred&&this._processMetaCreds([e.cred],!0)),t))},updateMode:function(e,t){const n=e?this.subscriber(e):null,s=n?n.acs.updateGiven(t).getGiven():this.getAccessMode().updateWant(t).getWant();return this.setMeta({sub:{user:e,mode:s}})},invite:function(e,t){return this.setMeta({sub:{user:e,mode:t}})},archive:function(e){return this.private&&this.private.arch==e?Promise.resolve(e):this.setMeta({desc:{private:{arch:!!e||M.DEL_CHAR}}})},delMessages:function(e,t){if(!this._subscribed)return Promise.reject(new Error("Cannot delete messages in inactive topic"));e.sort((e,t)=>e.low=t.hi));let n,s=e.reduce((e,t)=>(t.low<268435455&&(!t.hi||t.hi<268435455?e.push(t):e.push({low:t.low,hi:this._maxSeq+1})),e),[]);return(n=s.length>0?this._tinode.delMessages(this.name,s,t):Promise.resolve({params:{del:0}})).then(t=>(t.params.del>this._maxDel&&(this._maxDel=t.params.del),e.map(e=>{e.hi?this.flushMessageRange(e.low,e.hi):this.flushMessage(e.low)}),this._updateDeletedRanges(),this.onData&&this.onData(),t))},delMessagesAll:function(e){return!this._maxSeq||this._maxSeq<=0?Promise.resolve():this.delMessages([{low:1,hi:this._maxSeq+1,_all:!0}],e)},delMessagesList:function(e,t){e.sort((e,t)=>e-t);let n=e.reduce((e,t)=>{if(0==e.length)e.push({low:t});else{let n=e[e.length-1];!n.hi&&t!=n.low+1||t>n.hi?e.push({low:t}):n.hi=n.hi?Math.max(n.hi,t+1):t+1}return e},[]);return this.delMessages(n,t)},delTopic:function(e){return this._tinode.delTopic(this.name,e).then(e=>(this._resetSub(),this._gone(),e))},delSubscription:function(e){return this._subscribed?this._tinode.delSubscription(this.name,e).then(t=>(delete this._users[e],this.onSubsUpdated&&this.onSubsUpdated(Object.keys(this._users)),t)):Promise.reject(new Error("Cannot delete subscription in inactive topic"))},note:function(e,t){if(!this._subscribed)return;const n=this._tinode.getMeTopic(),s=this._users[this._tinode.getCurrentUserID()];let i=!1;s?(!s[e]||s[e]0&&this.note("read",e)},noteKeyPress:function(){this._subscribed?this._tinode.noteKeyPress(this.name):this._tinode.logger("INFO: Cannot send notification in inactive topic")},userDesc:function(e){const t=this._cacheGetUser(e);if(t)return t},p2pPeerDesc:function(){if(this.isP2P())return this._users[this.name]},subscribers:function(e,t){const n=e||this.onMetaSub;if(n)for(let e in this._users)n.call(t,this._users[e],e,this._users)},tags:function(){return this._tags.slice(0)},subscriber:function(e){return this._users[e]},messages:function(e,t,n,s){const i=e||this.onData;if(i){let e="number"==typeof t?this._messages.find({seq:t},!0):void 0,o="number"==typeof n?this._messages.find({seq:n},!0):void 0;-1!=e&&-1!=o&&this._messages.forEach(i,e,o,s)}},queuedMessages:function(e,t){if(!e)throw new Error("Callback must be provided");this.messages(e,268435455,void 0,t)},msgReceiptCount:function(e,t){let n=0;if(t>0){const s=this._tinode.getCurrentUserID();for(let i in this._users){const o=this._users[i];o.user!==s&&o[e]>=t&&n++}}return n},msgReadCount:function(e){return this.msgReceiptCount("read",e)},msgRecvCount:function(e){return this.msgReceiptCount("recv",e)},msgHasMoreMessages:function(e){return e?this.seq>this._maxSeq:this._minSeq>1&&!this._noEarlierMsgs},isNewMessage:function(e){return this._maxSeq<=e},flushMessage:function(e){const t=this._messages.find({seq:e});return t>=0?this._messages.delAt(t):void 0},swapMessageId:function(e,t){const n=this._messages.find({seq:e.seq}),s=this._messages.length();e.seq=t,0<=n&&n0&&this._messages.getAt(n-1).seq>=t||n+1=0?this._messages.delRange(n,this._messages.find({seq:t},!0)):[]},cancelSend:function(e){const t=this._messages.find({seq:e});if(t>=0){const e=this._messages.getAt(t),n=this.msgStatus(e);if(1==n||3==n)return e._cancelled=!0,this._messages.delAt(t),this.onData&&this.onData(),!0}return!1},getType:function(){return M.topicType(this.name)},getAccessMode:function(){return this.acs},getDefaultAccess:function(){return this.defacs},startMetaQuery:function(){return new S(this)},isArchived:function(){return!(!this.private||!this.private.arch)},isChannel:function(){return M.isChannelTopicName(this.name)},isGroup:function(){return M.isGroupTopicName(this.name)},isP2P:function(){return M.isP2PTopicName(this.name)},msgStatus:function(e){let t=0;return this._tinode.isMe(e.from)?e._sending?t=2:e._failed||e._cancelled?t=3:e.seq>=268435455?t=1:this.msgReadCount(e.seq)>0?t=6:this.msgRecvCount(e.seq)>0?t=5:e.seq>0&&(t=4):t=7,t},_routeData:function(e){e.content&&(!this.touched||this.touchedthis._maxSeq&&(this._maxSeq=e.seq),(e.seq0&&(this._lastSubsUpdate=e.ts,this._processMetaSub(e.sub)),e.del&&this._processDelMessages(e.del.clear,e.del.delseq),e.tags&&this._processMetaTags(e.tags),e.cred&&this._processMetaCreds(e.cred),this.onMeta&&this.onMeta(e)},_routePres:function(e){let t;switch(e.what){case"del":this._processDelMessages(e.clear,e.delseq);break;case"on":case"off":(t=this._users[e.src])?t.online="on"==e.what:this._tinode.logger("WARNING: Presence update for an unknown user",this.name,e.src);break;case"term":this._resetSub();break;case"acs":const n=e.src||this._tinode.getCurrentUserID();if(t=this._users[n])t.acs.updateAll(e.dacs),this._processMetaSub([{user:n,updated:new Date,acs:t.acs}]);else{const s=(new x).updateAll(e.dacs);s&&s.mode!=x._NONE&&((t=this._cacheGetUser(n))?t.acs=s:(t={user:n,acs:s},this.getMeta(this.startMetaQuery().withOneSub(void 0,n).build())),t.updated=new Date,this._processMetaSub([t]))}break;default:this._tinode.logger("INFO: Ignored presence update",e.what)}this.onPres&&this.onPres(e)},_routeInfo:function(e){if("kp"!==e.what){const t=this._users[e.from];if(t&&(t[e.what]=e.seq,t.recv0&&(this._updateDeletedRanges(),this.onData&&this.onData())},_allMessagesReceived:function(e){this._updateDeletedRanges(),this.onAllMessagesReceived&&this.onAllMessagesReceived(e)},_resetSub:function(){this._subscribed=!1},_gone:function(){this._messages.reset(),this._users={},this.acs=new x(null),this.private=null,this.public=null,this._maxSeq=0,this._minSeq=0,this._subscribed=!1;const e=this._tinode.getMeTopic();e&&e._routePres({_noForwarding:!0,what:"gone",topic:"me",src:this.name}),this.onDeleteTopic&&this.onDeleteTopic()},_updateCachedUser:function(e,t){let n=this._cacheGetUser(e);return n=p(n||{},t),this._cachePutUser(e,n),g(this._users,e,n)},_getQueuedSeqId:function(){return this._queuedSeqId++},_updateDeletedRanges:function(){const e=[];let t=null;const n=this._messages.getAt(0);n&&this._minSeq>1&&!this._noEarlierMsgs?n.hi?(n.seq>1&&(n.seq=1),n.hi{n.seq>=268435455||(n.seq!=(t.hi||t.seq)+1?t.hi?t.hi=n.hi||n.seq:(t={seq:(t.hi||t.seq)+1,hi:n.hi||n.seq},e.push(t)):t=n)});const s=this._messages.getLast(),i=Math.max(this.seq,this._maxSeq)||0;(i>0&&!s||s&&(s.hi||s.seq){this._messages.put(e)})}};var y=function(e){T.call(this,"me",e),this._contacts={},e&&(this.onContactUpdate=e.onContactUpdate)};y.prototype=Object.create(T.prototype,{_processMetaDesc:{value:function(e){const t=e.acs&&!e.acs.isPresencer()&&this.acs&&this.acs.isPresencer();p(this,e),m(this),t&&Object.values(this._contacts).map(e=>{e.online&&(e.online=!1,e.seen?e.seen.when=new Date:e.seen={when:new Date},this.onContactUpdate&&this.onContactUpdate("off",e))}),this.onMetaDesc&&this.onMetaDesc(this)},enumerable:!0,configurable:!0,writable:!1},_processMetaSub:{value:function(e){let t=0;for(let n in e){const s=e[n],i=s.topic;if("fnd"==i||"me"==i)continue;s.updated=new Date(s.updated),s.touched=s.touched?new Date(s.touched):void 0,s.deleted=s.deleted?new Date(s.deleted):null;let o=null;if(s.deleted)o=s,delete this._contacts[i],this._tinode.cacheDel("topic",i);else if(void 0!==s.seq&&(s.seq=0|s.seq,s.recv=0|s.recv,s.read=0|s.read,s.unread=s.seq-s.read),s.seen&&s.seen.when&&(s.seen.when=new Date(s.seen.when)),o=g(this._contacts,i,s),M.isP2PTopicName(i)&&this._cachePutUser(i,o),!s._noForwarding){const e=this._tinode.getTopic(i);e&&(s._noForwarding=!0,e._processMetaDesc(s))}t++,this.onMetaSub&&this.onMetaSub(o)}this.onSubsUpdated&&this.onSubsUpdated(Object.keys(this._contacts),t)},enumerable:!0,configurable:!0,writable:!1},_processMetaCreds:{value:function(e,t){1==e.length&&e[0]==M.DEL_CHAR&&(e=[]),t?e.map(e=>{if(e.val){let t=this._credentials.findIndex(t=>t.meth==e.meth&&t.val==e.val);t<0?(e.done||(t=this._credentials.findIndex(t=>t.meth==e.meth&&!t.done))>=0&&this._credentials.splice(t,1),this._credentials.push(e)):this._credentials[t].done=e.done}else if(e.resp){const t=this._credentials.findIndex(t=>t.meth==e.meth&&!t.done);t>=0&&(this._credentials[t].done=!0)}}):this._credentials=e,this.onCredsUpdated&&this.onCredsUpdated(this._credentials)},enumerable:!0,configurable:!0,writable:!1},_routePres:{value:function(e){if("term"==e.what)return void this._resetSub();if("upd"==e.what&&"me"==e.src)return void this.getMeta(this.startMetaQuery().withDesc().build());const t=this._contacts[e.src];if(t){switch(e.what){case"on":t.online=!0;break;case"off":t.online&&(t.online=!1,t.seen?t.seen.when=new Date:t.seen={when:new Date});break;case"msg":t.touched=new Date,t.seq=0|e.seq,e.act&&!this._tinode.isMe(e.act)||(t.read=t.read?Math.max(t.read,t.seq):t.seq,t.recv=t.recv?Math.max(t.read,t.recv):t.read),t.unread=t.seq-(0|t.read);break;case"upd":this.getMeta(this.startMetaQuery().withLaterOneSub(e.src).build());break;case"acs":t.acs?t.acs.updateAll(e.dacs):t.acs=(new x).updateAll(e.dacs),t.touched=new Date;break;case"ua":t.seen={when:new Date,ua:e.ua};break;case"recv":e.seq=0|e.seq,t.recv=t.recv?Math.max(t.recv,e.seq):e.seq;break;case"read":e.seq=0|e.seq,t.read=t.read?Math.max(t.read,e.seq):e.seq,t.recv=t.recv?Math.max(t.read,t.recv):t.recv,t.unread=t.seq-t.read;break;case"gone":delete this._contacts[e.src],this._tinode.cacheDel("topic",e.src);break;case"del":break;default:this._tinode.logger("INFO: Unsupported presence update in 'me'",e.what)}this.onContactUpdate&&this.onContactUpdate(e.what,t)}else if("acs"==e.what){const t=new x(e.dacs);if(!t||t.mode==x._INVALID)return void this._tinode.logger("ERROR: Invalid access mode update",e.src,e.dacs);if(t.mode==x._NONE)return void this._tinode.logger("WARNING: Removing non-existent subscription",e.src,e.dacs);this.getMeta(this.startMetaQuery().withOneSub(void 0,e.src).build()),this._contacts[e.src]={touched:new Date,topic:e.src,online:!1,acs:t}}else"tags"==e.what&&this.getMeta(this.startMetaQuery().withTags().build());this.onPres&&this.onPres(e)},enumerable:!0,configurable:!0,writable:!1},publish:{value:function(){return Promise.reject(new Error("Publishing to 'me' is not supported"))},enumerable:!0,configurable:!0,writable:!1},delCredential:{value:function(e,t){return this._subscribed?this._tinode.delCredential(e,t).then(n=>{const s=this._credentials.findIndex(n=>n.meth==e&&n.val==t);return s>-1&&this._credentials.splice(s,1),this.onCredsUpdated&&this.onCredsUpdated(this._credentials),n}):Promise.reject(new Error("Cannot delete credential in inactive 'me' topic"))},enumerable:!0,configurable:!0,writable:!1},contacts:{value:function(e,t,n){for(let s in this._contacts){const i=this._contacts[s];t&&!t(i)||e.call(n,i,s,this._contacts)}},enumerable:!0,configurable:!0,writable:!0},setMsgReadRecv:{value:function(e,t,n,s){const i=this._contacts[e];let o,r=!1;if(i){switch(n|=0,i.seq=0|i.seq,i.read=0|i.read,i.recv=0|i.recv,t){case"recv":o=i.recv,i.recv=Math.max(i.recv,n),r=o!=i.recv;break;case"read":o=i.read,i.read=Math.max(i.read,n),r=o!=i.read;break;case"msg":o=i.seq,i.seq=Math.max(i.seq,n),(!i.touched||i.touched0&&this.onSubsUpdated&&this.onSubsUpdated(Object.keys(this._contacts))},enumerable:!0,configurable:!0,writable:!1},publish:{value:function(){return Promise.reject(new Error("Publishing to 'fnd' is not supported"))},enumerable:!0,configurable:!0,writable:!1},setMeta:{value:function(e){const t=this;return Object.getPrototypeOf(D.prototype).setMeta.call(this,e).then((function(){Object.keys(t._contacts).length>0&&(t._contacts={},t.onSubsUpdated&&t.onSubsUpdated([]))}))},enumerable:!0,configurable:!0,writable:!1},contacts:{value:function(e,t){const n=e||this.onMetaSub;if(n)for(let e in this._contacts)n.call(t,this._contacts[e],e,this._contacts)},enumerable:!0,configurable:!0,writable:!0}}),D.prototype.constructor=D;var R=function(e){this._tinode=e,this._apiKey=e._apiKey,this._authToken=e.getAuthToken(),this._msgId=e.getNextUniqueId(),this.xhr=new XMLHttpRequest,this.toResolve=null,this.toReject=null,this.onProgress=null,this.onSuccess=null,this.onFailure=null};R.prototype={uploadWithBaseUrl:function(e,t,n,s,i){if(!this._authToken)throw new Error("Must authenticate first");const o=this;let r="/v0/file/u/";if(e){if(0!=e.indexOf("http://")&&0!=e.indexOf("https://"))throw new Error("Invalid base URL '"+e+"'");r=e+r}this.xhr.open("POST",r,!0),this.xhr.setRequestHeader("X-Tinode-APIKey",this._apiKey),this.xhr.setRequestHeader("X-Tinode-Auth","Token "+this._authToken.token);const a=new Promise((e,t)=>{this.toResolve=e,this.toReject=t});this.onProgress=n,this.onSuccess=s,this.onFailure=i,this.xhr.upload.onprogress=e=>{e.lengthComputable&&o.onProgress&&o.onProgress(e.loaded/e.total)},this.xhr.onload=function(){let e;try{e=JSON.parse(this.response,_)}catch(t){o._tinode.logger("ERROR: Invalid server response in LargeFileHelper",this.response),e={ctrl:{code:this.status,text:this.statusText}}}this.status>=200&&this.status<300?(o.toResolve&&o.toResolve(e.ctrl.params.url),o.onSuccess&&o.onSuccess(e.ctrl)):this.status>=400?(o.toReject&&o.toReject(new Error(e.ctrl.text+" ("+e.ctrl.code+")")),o.onFailure&&o.onFailure(e.ctrl)):o._tinode.logger("ERROR: Unexpected server response status",this.status,this.response)},this.xhr.onerror=function(e){o.toReject&&o.toReject(new Error("failed")),o.onFailure&&o.onFailure(null)},this.xhr.onabort=function(e){o.toReject&&o.toReject(new Error("upload cancelled by user")),o.onFailure&&o.onFailure(null)};try{const e=new FormData;e.append("file",t),e.set("id",this._msgId),this.xhr.send(e)}catch(e){this.toReject&&this.toReject(e),this.onFailure&&this.onFailure(null)}return a},upload:function(e,t,n,s){return this.uploadWithBaseUrl(void 0,e,t,n,s)},download:function(e,t,n,s,i){if(!M.isRelativeURL(e))return void(i&&i("The URL '"+e+"' must be relative, not absolute"));if(!this._authToken)return void(i&&i("Must authenticate first"));const o=this;this.xhr.open("GET",e,!0),this.xhr.setRequestHeader("X-Tinode-APIKey",this._apiKey),this.xhr.setRequestHeader("X-Tinode-Auth","Token "+this._authToken.token),this.xhr.responseType="blob",this.onProgress=s,this.xhr.onprogress=function(e){o.onProgress&&o.onProgress(e.loaded)};const r=new Promise((e,t)=>{this.toResolve=e,this.toReject=t});this.xhr.onload=function(){if(200==this.status){const e=document.createElement("a");e.href=window.URL.createObjectURL(new Blob([this.response],{type:n})),e.style.display="none",e.setAttribute("download",t),document.body.appendChild(e),e.click(),document.body.removeChild(e),window.URL.revokeObjectURL(e.href),o.toResolve&&o.toResolve()}else if(this.status>=400&&o.toReject){const e=new FileReader;e.onload=function(){try{const e=JSON.parse(this.result,_);o.toReject(new Error(e.ctrl.text+" ("+e.ctrl.code+")"))}catch(e){o._tinode.logger("ERROR: Invalid server response in LargeFileHelper",this.result),o.toReject(e)}},e.readAsText(this.response)}},this.xhr.onerror=function(e){o.toReject&&o.toReject(new Error("failed"))},this.xhr.onabort=function(){o.toReject&&o.toReject(null)};try{this.xhr.send()}catch(e){this.toReject&&this.toReject(e)}return r},cancel:function(){this.xhr&&this.xhr.readyState<4&&this.xhr.abort()},getId:function(){return this._msgId}};var A=function(e,t){this.status=A.STATUS_NONE,this.topic=e,this.content=t};A.STATUS_NONE=0,A.STATUS_QUEUED=1,A.STATUS_SENDING=2,A.STATUS_FAILED=3,A.STATUS_SENT=4,A.STATUS_RECEIVED=5,A.STATUS_READ=6,A.STATUS_TO_ME=7,A.prototype={toJSON:function(){},fromJSON:function(e){}},A.prototype.constructor=A,s.exports=M,s.exports.Drafty=i,s.exports.AccessMode=x}.call(this,"undefined"!=typeof global?global:"undefined"!=typeof self?self:"undefined"!=typeof window?window:{}),s=s.exports})); \ No newline at end of file