Implements GET for images

router.go

@@ -9,6 +9,7 @@ import (
 	"path"
 	"path/filepath"
 	"strconv"
+	"strings"
 
 	"ponyo.epfl.ch/gitlab/alexandre.tuleu/narco"
 
@@ -75,7 +76,7 @@ func (a *appData) buildRouter() http.Handler {
 			}
 
 			album := *albumUnsafe
-			album.CoverURL = fmt.Sprintf("/covers/%d%s", album.ID, album.CoverExt())
+			album.CoverURL = fmt.Sprintf("/covers/%d%s", album.ID, AlbumCoverExt(album.CoverURL))
 
 			enc := json.NewEncoder(w)
 			if err := enc.Encode(album); err != nil {
@@ -83,6 +84,36 @@ func (a *appData) buildRouter() http.Handler {
 			}
 		})))
 
+	router.GET("/covers/:name", narco.EndChain(ch, narco.HandlerFunc(
+		func(ctx context.Context, w http.ResponseWriter, req *http.Request, ps httprouter.Params) {
+			var ID uint64
+			var err error = fmt.Errorf("Not Found")
+			var requestedExt string
+			name := ps.ByName("name")
+			if len(name) > 0 {
+				requestedExt = path.Ext(name)
+				ID, err = strconv.ParseUint(strings.TrimSuffix(name, requestedExt), 10, 64)
+			}
+
+			if err != nil {
+				narco.Error(ctx, w, http.StatusText(http.StatusNotFound), http.StatusNotFound)
+			}
+
+			rc, ext, err := a.cover.GetCover(AlbumID(ID))
+			if rc != nil {
+				defer closeOrPanic(rc, "Album cover "+name)
+			}
+			if err != nil {
+				narco.Error(ctx, w, err, http.StatusInternalServerError)
+			}
+			if ext != requestedExt {
+				narco.Error(ctx, w, http.StatusText(http.StatusNotFound), http.StatusNotFound)
+			}
+
+			io.Copy(w, rc)
+
+		})))
+
 	dirs := []string{"css", "js", "img"}
 	for _, d := range dirs {
 		router.ServeFiles(path.Join("/", d, "/*filepath"), http.Dir(filepath.Join("static", d)))