From 5915e8e86ada284d9e55b5a8b91de11a36f90b88 Mon Sep 17 00:00:00 2001
From: Jakob Borg <jakob@nym.se>
Date: Thu, 4 Sep 2014 08:24:42 +0200
Subject: [PATCH] Don't trust mime.TypeByExtension for the easy stuff (fixes
 #598)

---
 cmd/syncthing/gui.go | 25 ++++++++++++++++++++++++-
 1 file changed, 24 insertions(+), 1 deletion(-)

diff --git a/cmd/syncthing/gui.go b/cmd/syncthing/gui.go
index 0a01b920b..0f9a1cd65 100644
--- a/cmd/syncthing/gui.go
+++ b/cmd/syncthing/gui.go
@@ -680,7 +680,7 @@ func embeddedStatic(assetDir string) http.Handler {
 			return
 		}
 
-		mtype := mime.TypeByExtension(filepath.Ext(r.URL.Path))
+		mtype := mimeTypeForFile(file)
 		if len(mtype) != 0 {
 			w.Header().Set("Content-Type", mtype)
 		}
@@ -690,3 +690,26 @@ func embeddedStatic(assetDir string) http.Handler {
 		w.Write(bs)
 	})
 }
+
+func mimeTypeForFile(file string) string {
+	// We use a built in table of the common types since the system
+	// TypeByExtension might be unreliable. But if we don't know, we delegate
+	// to the system.
+	ext := filepath.Ext(file)
+	switch ext {
+	case ".htm", ".html":
+		return "text/html"
+	case ".css":
+		return "text/css"
+	case ".js":
+		return "application/javascript"
+	case ".json":
+		return "application/json"
+	case ".png":
+		return "image/png"
+	case ".ttf":
+		return "application/x-font-ttf"
+	default:
+		return mime.TypeByExtension(ext)
+	}
+}