feat: support internet radio stations for jukebox

fixes #481

server/ctrlsubsonic/specidpaths/specidpaths.go

@@ -39,7 +39,7 @@ func Locate(dbc *db.DB, id specid.ID) (Result, error) {
 
 // Locate maps a location on the filesystem to a specid
 func Lookup(dbc *db.DB, musicPaths []string, podcastsPath string, path string) (Result, error) {
-	if !filepath.IsAbs(path) {
+	if !strings.HasPrefix(path, "http") && !filepath.IsAbs(path) {
 		return nil, ErrNotAbs
 	}
 
@@ -56,6 +56,15 @@ func Lookup(dbc *db.DB, musicPaths []string, podcastsPath string, path string) (
 		return nil, ErrNotFound
 	}
 
+	// probably internet radio
+	if strings.HasPrefix(path, "http") {
+		var irs db.InternetRadioStation
+		if err := dbc.First(&irs, "stream_url=?", path).Error; err == nil {
+			return &irs, nil
+		}
+		return nil, ErrNotFound
+	}
+
 	var musicPath string
 	for _, mp := range musicPaths {
 		if fileutil.HasPrefix(path, mp) {