Add cache control header to static content

lib/cover.go

@@ -52,6 +52,7 @@ func coverHandler(h handler) {
 
 	headers := h.w.Header()
 	headers["Content-Type"] = []string{"image/jpeg"}
+	addCacheControlHeader(h.w, false)
 
 	_, err = io.Copy(h.w, f)
 	if err != nil {

lib/reader.go

@@ -241,6 +241,8 @@ func openEpubFile(h handler, id string, file string) error {
 		return err
 	}
 	defer html.Close()
+
+	addCacheControlHeader(h.w, false)
 	io.Copy(h.w, html)
 	return nil
 }

lib/trantor.go

@@ -93,6 +93,7 @@ func downloadHandler(h handler) {
 	headers := h.w.Header()
 	headers["Content-Type"] = []string{"application/epub+zip"}
 	headers["Content-Disposition"] = []string{"attachment; filename=\"" + book.Title + ".epub\""}
+	addCacheControlHeader(h.w, false)
 
 	io.Copy(h.w, f)
 }
@@ -207,7 +208,6 @@ func fileServer(servePath string, prefix string) func(w http.ResponseWriter, r *
 }
 
 func addCacheControlHeader(w http.ResponseWriter, private bool) {
-	// FIXME: cache of download and cover don't depends on user login
 	if private {
 		w.Header().Set("Cache-Control", fmt.Sprintf("max-age=%d, private", cacheMaxAge))
 	} else {