Refactors Cover's Extension cleaning in Album

router.go

@@ -8,9 +8,7 @@ import (
 	"os"
 	"path"
 	"path/filepath"
-	"regexp"
 	"strconv"
-	"strings"
 
 	"ponyo.epfl.ch/gitlab/alexandre.tuleu/narco"
 
@@ -20,8 +18,6 @@ import (
 	"golang.org/x/net/context"
 )
 
-var rxExt = regexp.MustCompile(`[0-9]+`)
-
 func (a *appData) buildRouter() http.Handler {
 	router := httprouter.New()
 
@@ -79,9 +75,7 @@ func (a *appData) buildRouter() http.Handler {
 			}
 
 			album := *albumUnsafe
-			ext := path.Ext(album.CoverURL)
-			ext = strings.ToLower(rxExt.ReplaceAllString(ext, ""))
-			album.CoverURL = fmt.Sprintf("/covers/%d%s", album.ID, ext)
+			album.CoverURL = fmt.Sprintf("/covers/%d%s", album.ID, album.CoverExt())
 
 			enc := json.NewEncoder(w)
 			if err := enc.Encode(album); err != nil {