allow automatic subscription to a new p2p topic

src/config.js

@@ -122,3 +122,7 @@ export const LINK_PRIVACY_POLICY = 'https://tinode.co/privacy.html';
 // Link to Terms of Service.
 export const LINK_TERMS_OF_SERVICE = 'https://tinode.co/terms.html';
 
+// When user starts a P2P topic, automatic subscription does not
+// happen until the first message. Setting this option to true enables
+// immediate subscription.
+export const IMMEDIATE_P2P_SUBSCRIPTION = false;

src/views/messages-view.jsx

@@ -20,8 +20,8 @@ import MetaMessage from '../widgets/meta-message.jsx';
 import SendMessage from '../widgets/send-message.jsx';
 import VideoPreview from '../widgets/video-preview.jsx';
 
-import { DEFAULT_P2P_ACCESS_MODE, EDIT_PREVIEW_LENGTH, IMAGE_PREVIEW_DIM, KEYPRESS_DELAY,
-  MESSAGES_PAGE, MAX_EXTERN_ATTACHMENT_SIZE, MAX_IMAGE_DIM, MAX_INBAND_ATTACHMENT_SIZE,
+import { DEFAULT_P2P_ACCESS_MODE, EDIT_PREVIEW_LENGTH, IMAGE_PREVIEW_DIM, IMMEDIATE_P2P_SUBSCRIPTION,
+  KEYPRESS_DELAY, MESSAGES_PAGE, MAX_EXTERN_ATTACHMENT_SIZE, MAX_IMAGE_DIM, MAX_INBAND_ATTACHMENT_SIZE,
   READ_DELAY, QUOTED_REPLY_LENGTH, VIDEO_PREVIEW_DIM } from '../config.js';
 import { CALL_STATE_OUTGOING_INITATED, CALL_STATE_IN_PROGRESS } from '../constants.js';
 import { blobToBase64, fileToBase64, imageScaled, makeImageUrl } from '../lib/blob-helpers.js';
@@ -256,7 +256,7 @@ class MessagesView extends React.Component {
       if ((this.state.topic != prevState.topic) || !prevProps.ready) {
         // Don't immediately subscribe to a new p2p topic, wait for the first message.
         const newTopic = (this.props.newTopicParams && this.props.newTopicParams._topicName == this.props.topic);
-        if (topic.isP2PType() && newTopic) {
+        if (topic.isP2PType() && newTopic && !IMMEDIATE_P2P_SUBSCRIPTION) {
           topic.getMeta(topic.startMetaQuery().withDesc().build());
         } else {
           this.subscribe(topic);