feat: handle subtitles for video streaming (#468)

Former-commit-id: 4259259f666304a88a808093afd26967059bd702 [formerly c925c803e33aa5486e920291b97b27e15ee9e2b9] [formerly dfe55f167c82ce734968505765104f855284a095 [formerly eb12bf2c2d]]
Former-commit-id: 96c5284c2a8c00c97dce3965893b4820e7ed4e6e [formerly 84f9ed9f1256e89010c5e813dc0b589af6a32d4a]
Former-commit-id: 0c84bae4cefcd2fad3b65f0fbec31e565ca5f27b

http/http.go

@@ -137,7 +137,7 @@ func apiHandler(c *fb.Context, w http.ResponseWriter, r *http.Request) (int, err
 		}
 	}
 
-	if c.Router == "checksum" || c.Router == "download" {
+	if c.Router == "checksum" || c.Router == "download" || c.Router == "subtitle" || c.Router == "subtitles" {
 		var err error
 		c.File, err = fb.GetInfo(r.URL, c.FileBrowser, c.User)
 		if err != nil {
@@ -165,6 +165,10 @@ func apiHandler(c *fb.Context, w http.ResponseWriter, r *http.Request) (int, err
 		code, err = settingsHandler(c, w, r)
 	case "share":
 		code, err = shareHandler(c, w, r)
+	case "subtitles":
+		code, err = subtitlesHandler(c, w, r)
+	case "subtitle":
+		code, err = subtitleHandler(c, w, r)
 	default:
 		code = http.StatusNotFound
 	}

http/subtitle.go

@@ -0,0 +1,83 @@
+package http
+
+import (
+	"bytes"
+	fb "github.com/filebrowser/filebrowser"
+	"io/ioutil"
+	"net/http"
+	"os"
+	"path/filepath"
+	"regexp"
+)
+
+func subtitlesHandler(c *fb.Context, w http.ResponseWriter, r *http.Request) (int, error) {
+	files, err := ReadDir(filepath.Dir(c.File.Path))
+	if err != nil {
+		return http.StatusInternalServerError, err
+	}
+	var subtitles = make([]map[string]string, 0)
+	for _, file := range files {
+		ext := filepath.Ext(file.Name())
+		if ext == ".vtt" || ext == ".srt" {
+			var sub map[string]string = make(map[string]string)
+			sub["src"] = filepath.Dir(c.File.Path) + "/" + file.Name()
+			sub["kind"] = "subtitles"
+			sub["label"] = file.Name()
+			subtitles = append(subtitles, sub)
+		}
+	}
+	return renderJSON(w, subtitles)
+}
+
+func subtitleHandler(c *fb.Context, w http.ResponseWriter, r *http.Request) (int, error) {
+	str, err := CleanSubtitle(c.File.Path)
+	if err != nil {
+		return http.StatusInternalServerError, err
+	}
+
+	file, err := os.Open(c.File.Path)
+	defer file.Close()
+
+	if err != nil {
+		return http.StatusInternalServerError, err
+	}
+
+	stat, err := file.Stat()
+	if err != nil {
+		return http.StatusInternalServerError, err
+	}
+
+	w.Header().Set("Content-Disposition", "inline")
+	w.Header().Set("Content-Type", "text/vtt")
+	http.ServeContent(w, r, stat.Name(), stat.ModTime(), bytes.NewReader([]byte(str)))
+
+	return 0, nil
+
+}
+
+func CleanSubtitle(filename string) (string, error) {
+	b, err := ioutil.ReadFile(filename)
+	if err != nil {
+		return "", err
+	}
+	str := string(b) // convert content to a 'string'
+	ext := filepath.Ext(filename)
+	if ext == ".srt" {
+		re := regexp.MustCompile("([0-9]{2}:[0-9]{2}:[0-9]{2}),([0-9]{3})")
+		str = "WEBVTT\n\n" + re.ReplaceAllString(str, "$1.$2")
+	}
+	return str, err
+}
+
+func ReadDir(dirname string) ([]os.FileInfo, error) {
+	f, err := os.Open(dirname)
+	if err != nil {
+		return nil, err
+	}
+	list, err := f.Readdir(-1)
+	f.Close()
+	if err != nil {
+		return nil, err
+	}
+	return list, nil
+}