| 39 | }) |
| 40 | |
| 41 | func subtitleFileHandler(w http.ResponseWriter, r *http.Request, file *files.FileInfo) (int, error) { |
| 42 | // if its not a subtitle file, reject |
| 43 | if !files.IsSupportedSubtitle(file.Name) { |
| 44 | return http.StatusBadRequest, nil |
| 45 | } |
| 46 | |
| 47 | fd, err := file.Fs.Open(file.Path) |
| 48 | if err != nil { |
| 49 | return http.StatusInternalServerError, err |
| 50 | } |
| 51 | defer fd.Close() |
| 52 | |
| 53 | // load subtitle for conversion to vtt |
| 54 | var sub *astisub.Subtitles |
| 55 | if strings.HasSuffix(file.Name, ".srt") { |
| 56 | content, readErr := io.ReadAll(fd) |
| 57 | if readErr != nil { |
| 58 | return http.StatusInternalServerError, readErr |
| 59 | } |
| 60 | sub, err = astisub.ReadFromSRT(bytes.NewReader(normalizeSRTLineBreaks(content))) |
| 61 | } else if strings.HasSuffix(file.Name, ".ass") || strings.HasSuffix(file.Name, ".ssa") { |
| 62 | sub, err = astisub.ReadFromSSA(fd) |
| 63 | } |
| 64 | if err != nil { |
| 65 | return http.StatusInternalServerError, err |
| 66 | } |
| 67 | |
| 68 | setContentDisposition(w, r, file) |
| 69 | w.Header().Add("Content-Security-Policy", `script-src 'none';`) |
| 70 | w.Header().Set("Cache-Control", "private") |
| 71 | // force type to text/vtt |
| 72 | w.Header().Set("Content-Type", "text/vtt") |
| 73 | |
| 74 | // serve vtt file directly |
| 75 | if sub == nil { |
| 76 | http.ServeContent(w, r, file.Name, file.ModTime, fd) |
| 77 | return 0, nil |
| 78 | } |
| 79 | |
| 80 | // convert others to vtt and serve from buffer |
| 81 | var buf = &bytes.Buffer{} |
| 82 | err = sub.WriteToWebVTT(buf) |
| 83 | if err != nil { |
| 84 | return http.StatusInternalServerError, err |
| 85 | } |
| 86 | http.ServeContent(w, r, file.Name, file.ModTime, bytes.NewReader(buf.Bytes())) |
| 87 | return 0, nil |
| 88 | } |
| 89 | |
| 90 | func normalizeSRTLineBreaks(content []byte) []byte { |
| 91 | return srtLineBreakTag.ReplaceAll(content, []byte("\n")) |