Refactor mime-types configuration

consts/mime_types.go

@@ -1,43 +1,59 @@
 package consts
 
-import "mime"
+import (
+	"mime"
+	"sort"
+	"strings"
+)
 
-var LosslessFormats = []string{
-	"flac", "wav", "alac", "ape", "dsf", "wav", "shn", "wv", "wvp",
+type format struct {
+	typ      string
+	lossless bool
 }
 
+var audioFormats = map[string]format{
+	".mp3":  {typ: "audio/mpeg"},
+	".ogg":  {typ: "audio/ogg"},
+	".oga":  {typ: "audio/ogg"},
+	".opus": {typ: "audio/ogg"},
+	".aac":  {typ: "audio/mp4"},
+	".alac": {typ: "audio/mp4", lossless: true},
+	".m4a":  {typ: "audio/mp4"},
+	".m4b":  {typ: "audio/mp4"},
+	".flac": {typ: "audio/flac", lossless: true},
+	".wav":  {typ: "audio/x-wav", lossless: true},
+	".wma":  {typ: "audio/x-ms-wma"},
+	".ape":  {typ: "audio/x-monkeys-audio", lossless: true},
+	".mpc":  {typ: "audio/x-musepack"},
+	".shn":  {typ: "audio/x-shn", lossless: true},
+	".aif":  {typ: "audio/x-aiff"},
+	".aiff": {typ: "audio/x-aiff"},
+	".m3u":  {typ: "audio/x-mpegurl"},
+	".pls":  {typ: "audio/x-scpls"},
+	".dsf":  {typ: "audio/dsd", lossless: true},
+	".wv":   {typ: "audio/x-wavpack", lossless: true},
+	".wvp":  {typ: "audio/x-wavpack", lossless: true},
+}
+var imageFormats = map[string]string{
+	".gif":  "image/gif",
+	".jpg":  "image/jpeg",
+	".jpeg": "image/jpeg",
+	".webp": "image/webp",
+	".png":  "image/png",
+	".bmp":  "image/bmp",
+}
+
+var LosslessFormats []string
+
 func init() {
-	mt := map[string]string{
-		".mp3":  "audio/mpeg",
-		".ogg":  "audio/ogg",
-		".oga":  "audio/ogg",
-		".opus": "audio/ogg",
-		".aac":  "audio/mp4",
-		".alac": "audio/mp4",
-		".m4a":  "audio/mp4",
-		".m4b":  "audio/mp4",
-		".flac": "audio/flac",
-		".wav":  "audio/x-wav",
-		".wma":  "audio/x-ms-wma",
-		".ape":  "audio/x-monkeys-audio",
-		".mpc":  "audio/x-musepack",
-		".shn":  "audio/x-shn",
-		".aif":  "audio/x-aiff",
-		".aiff": "audio/x-aiff",
-		".m3u":  "audio/x-mpegurl",
-		".pls":  "audio/x-scpls",
-		".dsf":  "audio/dsd",
-		".wv":   "audio/x-wavpack",
-		".wvp":  "audio/x-wavpack",
-		".gif":  "image/gif",
-		".jpg":  "image/jpeg",
-		".jpeg": "image/jpeg",
-		".webp": "image/webp",
-		".png":  "image/png",
-		".bmp":  "image/bmp",
+	for ext, fmt := range audioFormats {
+		_ = mime.AddExtensionType(ext, fmt.typ)
+		if fmt.lossless {
+			LosslessFormats = append(LosslessFormats, strings.TrimPrefix(ext, "."))
+		}
 	}
-
-	for ext, typ := range mt {
+	sort.Strings(LosslessFormats)
+	for ext, typ := range imageFormats {
 		_ = mime.AddExtensionType(ext, typ)
 	}
 }