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// Package oss implements media interface by storing media objects in Alibaba Cloud OSS.
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package oss
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import (
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"encoding/base32"
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"encoding/json"
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"errors"
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"hash/fnv"
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"io"
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"mime"
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"net/http"
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"net/url"
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"path"
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"strconv"
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"strings"
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"sync/atomic"
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"time"
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aliyunoss "github.com/aliyun/aliyun-oss-go-sdk/oss"
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"github.com/tinode/chat/server/logs"
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"github.com/tinode/chat/server/media"
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"github.com/tinode/chat/server/store"
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"github.com/tinode/chat/server/store/types"
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)
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const (
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defaultServeURL = "/v0/file/s/"
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defaultCacheControl = "no-cache, must-revalidate"
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handlerName = "oss"
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// Presign GET URLs for this number of seconds.
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defaultPresignDuration = 120
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)
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type ossConfig struct {
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AccessKeyID string `json:"access_key_id"`
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AccessKeySecret string `json:"access_key_secret"`
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Endpoint string `json:"endpoint"`
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BucketName string `json:"bucket"`
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CorsOrigins []string `json:"cors_origins"`
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ServeURL string `json:"serve_url"`
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PresignTTL int `json:"presign_ttl"`
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CacheControl string `json:"cache_control"`
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VerifyBucket bool `json:"verify_bucket"`
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}
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type ossHandler struct {
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client *aliyunoss.Client
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bucket *aliyunoss.Bucket
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conf ossConfig
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corsOrigins []media.AllowedOrigin
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}
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type readerCounter struct {
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count int64
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reader io.Reader
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}
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func (rc *readerCounter) Read(buf []byte) (int, error) {
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n, err := rc.reader.Read(buf)
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atomic.AddInt64(&rc.count, int64(n))
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return n, err
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}
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// Init initializes the media handler.
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func (oh *ossHandler) Init(jsconf string) error {
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var err error
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if err = json.Unmarshal([]byte(jsconf), &oh.conf); err != nil {
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return errors.New("failed to parse config: " + err.Error())
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}
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if oh.conf.AccessKeyID == "" {
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return errors.New("missing Access Key ID")
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}
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if oh.conf.AccessKeySecret == "" {
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return errors.New("missing Access Key Secret")
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}
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if oh.conf.Endpoint == "" {
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return errors.New("missing Endpoint")
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}
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if oh.conf.BucketName == "" {
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return errors.New("missing Bucket")
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}
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if oh.conf.PresignTTL <= 0 {
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oh.conf.PresignTTL = defaultPresignDuration
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}
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if oh.conf.CacheControl == "" {
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oh.conf.CacheControl = defaultCacheControl
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}
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if oh.conf.ServeURL == "" {
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oh.conf.ServeURL = defaultServeURL
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}
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oh.corsOrigins, err = media.ParseCORSAllow(oh.conf.CorsOrigins)
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if err != nil {
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return errors.New("failed to parse CORS allowed origins: " + err.Error())
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}
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oh.client, err = aliyunoss.New(oh.conf.Endpoint, oh.conf.AccessKeyID, oh.conf.AccessKeySecret)
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if err != nil {
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return err
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}
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if oh.conf.VerifyBucket {
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exists, err := oh.client.IsBucketExist(oh.conf.BucketName)
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if err != nil {
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return err
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}
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if !exists {
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return errors.New("bucket does not exist")
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}
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}
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oh.bucket, err = oh.client.Bucket(oh.conf.BucketName)
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return err
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}
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// Headers adds CORS headers and redirects GET and HEAD requests to OSS.
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func (oh *ossHandler) Headers(tenantID types.TenantID, method string, url *url.URL, headers http.Header, serve bool) (http.Header, int, error) {
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headers, status := media.CORSHandler(method, headers, oh.corsOrigins, serve)
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if status != 0 || method == http.MethodPost || method == http.MethodPut {
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return headers, status, nil
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}
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fid := oh.GetIdFromUrl(url.String())
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if fid.IsZero() {
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return nil, 0, types.ErrNotFound
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}
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fdef, err := oh.getFileRecord(tenantID, fid)
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if err != nil {
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return nil, 0, err
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}
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if fdef.ETag != "" && strings.Trim(headers.Get("If-None-Match"), "\"") == fdef.ETag {
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return http.Header{
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"ETag": {`"` + fdef.ETag + `"`},
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"Cache-Control": {oh.conf.CacheControl},
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}, http.StatusNotModified, nil
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}
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var redirURL string
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switch method {
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case http.MethodGet:
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options := []aliyunoss.Option{
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aliyunoss.ResponseCacheControl(oh.conf.CacheControl),
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aliyunoss.ResponseContentType(fdef.MimeType),
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}
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if isAttachment, _ := strconv.ParseBool(url.Query().Get("asatt")); isAttachment {
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options = append(options, aliyunoss.ResponseContentDisposition("attachment"))
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}
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redirURL, err = oh.bucket.SignURL(fdef.Location, aliyunoss.HTTPGet, int64(oh.conf.PresignTTL), options...)
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case http.MethodHead:
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redirURL, err = oh.bucket.SignURL(fdef.Location, aliyunoss.HTTPHead, int64(oh.conf.PresignTTL))
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}
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if err != nil {
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return nil, 0, err
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}
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if redirURL != "" {
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return http.Header{
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"Location": {redirURL},
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"ETag": {`"` + fdef.ETag + `"`},
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"Content-Type": {"application/json; charset=utf-8"},
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"Cache-Control": {oh.conf.CacheControl},
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}, http.StatusPermanentRedirect, nil
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}
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return nil, 0, nil
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}
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// Upload processes request for a file upload.
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func (oh *ossHandler) Upload(fdef *types.FileDef, file io.Reader) (string, int64, error) {
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key, err := tenantObjectKey(fdef.TenantID, fdef.Uid().String32(), fdef.CreatedAt)
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if err != nil {
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return "", 0, err
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}
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if err = store.Files.StartUpload(fdef.TenantID, fdef); err != nil {
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logs.Warn.Println("failed to create file record", fdef.Id, err)
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return "", 0, err
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}
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rc := readerCounter{reader: file}
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options := []aliyunoss.Option{aliyunoss.CacheControl(oh.conf.CacheControl)}
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if fdef.MimeType != "" {
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options = append(options, aliyunoss.ContentType(fdef.MimeType))
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}
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if err = oh.bucket.PutObject(key, &rc, options...); err != nil {
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return "", 0, err
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}
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fname := fdef.Id
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ext, _ := mime.ExtensionsByType(fdef.MimeType)
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if len(ext) > 0 {
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fname += ext[0]
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}
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fdef.Location = key
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fdef.ETag = etagFromLocation(key)
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if meta, err := oh.bucket.GetObjectDetailedMeta(key); err == nil {
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if etag := strings.Trim(meta.Get("ETag"), "\""); etag != "" {
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fdef.ETag = etag
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}
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}
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return oh.conf.ServeURL + fname, rc.count, nil
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}
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// Download is unsupported because OSS objects are served through signed redirects.
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func (oh *ossHandler) Download(tenantID types.TenantID, url string) (*types.FileDef, media.ReadSeekCloser, error) {
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return nil, nil, types.ErrUnsupported
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}
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// Delete deletes files from OSS by provided object keys.
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func (oh *ossHandler) Delete(locations []string) error {
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for i := 0; i < len(locations); i += 1000 {
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end := i + 1000
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if end > len(locations) {
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end = len(locations)
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}
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if _, err := oh.bucket.DeleteObjects(locations[i:end], aliyunoss.DeleteObjectsQuiet(true)); err != nil {
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return err
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}
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}
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return nil
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}
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// GetIdFromUrl converts an attachment URL to a file UID.
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func (oh *ossHandler) GetIdFromUrl(url string) types.Uid {
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return media.GetIdFromUrl(url, oh.conf.ServeURL)
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}
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func (oh *ossHandler) getFileRecord(tenantID types.TenantID, fid types.Uid) (*types.FileDef, error) {
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fd, err := store.Files.Get(tenantID, fid.String())
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if err != nil {
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return nil, err
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}
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if fd == nil {
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return nil, types.ErrNotFound
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}
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return fd, nil
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}
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func tenantObjectKey(tenantID types.TenantID, fileID string, createdAt time.Time) (string, error) {
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if !tenantID.IsValid() || fileID == "" {
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return "", types.ErrMalformed
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}
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if createdAt.IsZero() {
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createdAt = time.Now().UTC()
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}
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return path.Join("tenants", strconv.FormatInt(int64(tenantID), 10),
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createdAt.Format("2006"), createdAt.Format("01"), fileID), nil
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}
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func etagFromLocation(location string) string {
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hasher := fnv.New128()
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hasher.Write([]byte(location))
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return strings.ToLower(base32.StdEncoding.WithPadding(base32.NoPadding).
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EncodeToString(hasher.Sum(make([]byte, 0, hasher.Size()))))
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}
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func init() {
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store.RegisterMediaHandler(handlerName, &ossHandler{})
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}
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richjohnrambo