filer: add CORS support

weed/server/filer_server_handlers.go

@@ -10,6 +10,10 @@ import (
 
 func (fs *FilerServer) filerHandler(w http.ResponseWriter, r *http.Request) {
 	w.Header().Set("Server", "SeaweedFS Filer "+util.VERSION)
+	if r.Header.Get("Origin") != "" {
+		w.Header().Set("Access-Control-Allow-Origin", "*")
+		w.Header().Set("Access-Control-Allow-Credentials", "true")
+	}
 	start := time.Now()
 	switch r.Method {
 	case "GET":
@@ -32,11 +36,19 @@ func (fs *FilerServer) filerHandler(w http.ResponseWriter, r *http.Request) {
 		stats.FilerRequestCounter.WithLabelValues("post").Inc()
 		fs.PostHandler(w, r)
 		stats.FilerRequestHistogram.WithLabelValues("post").Observe(time.Since(start).Seconds())
+	case "OPTIONS":
+		stats.FilerRequestCounter.WithLabelValues("options").Inc()
+		OptionsHandler(w, r, false)
+		stats.FilerRequestHistogram.WithLabelValues("head").Observe(time.Since(start).Seconds())
 	}
 }
 
 func (fs *FilerServer) readonlyFilerHandler(w http.ResponseWriter, r *http.Request) {
 	w.Header().Set("Server", "SeaweedFS Filer "+util.VERSION)
+	if r.Header.Get("Origin") != "" {
+		w.Header().Set("Access-Control-Allow-Origin", "*")
+		w.Header().Set("Access-Control-Allow-Credentials", "true")
+	}
 	start := time.Now()
 	switch r.Method {
 	case "GET":
@@ -47,5 +59,18 @@ func (fs *FilerServer) readonlyFilerHandler(w http.ResponseWriter, r *http.Reque
 		stats.FilerRequestCounter.WithLabelValues("head").Inc()
 		fs.GetOrHeadHandler(w, r, false)
 		stats.FilerRequestHistogram.WithLabelValues("head").Observe(time.Since(start).Seconds())
+	case "OPTIONS":
+		stats.FilerRequestCounter.WithLabelValues("options").Inc()
+		OptionsHandler(w, r, true)
+		stats.FilerRequestHistogram.WithLabelValues("head").Observe(time.Since(start).Seconds())
 	}
 }
+
+func OptionsHandler(w http.ResponseWriter, r *http.Request, isReadOnly bool) {
+	if isReadOnly {
+		w.Header().Add("Access-Control-Allow-Methods", "GET, OPTIONS")
+	} else {
+		w.Header().Add("Access-Control-Allow-Methods", "PUT, POST, GET, DELETE, OPTIONS")
+	}
+	w.Header().Add("Access-Control-Allow-Headers", "*")
+}

weed/server/volume_server_handlers.go

@@ -44,7 +44,8 @@ func (vs *VolumeServer) privateStoreHandler(w http.ResponseWriter, r *http.Reque
 		vs.guard.WhiteList(vs.PostHandler)(w, r)
 	case "OPTIONS":
 		stats.ReadRequest()
-		vs.guard.WhiteList(vs.OptionsHandler)(w, r)
+		w.Header().Add("Access-Control-Allow-Methods", "PUT, POST, GET, DELETE, OPTIONS")
+		w.Header().Add("Access-Control-Allow-Headers", "*")
 	}
 }
 
@@ -63,7 +64,8 @@ func (vs *VolumeServer) publicReadOnlyHandler(w http.ResponseWriter, r *http.Req
 		vs.GetOrHeadHandler(w, r)
 	case "OPTIONS":
 		stats.ReadRequest()
-		vs.OptionsHandler(w, r)
+		w.Header().Add("Access-Control-Allow-Methods", "GET, OPTIONS")
+		w.Header().Add("Access-Control-Allow-Headers", "*")
 	}
 }
 

weed/server/volume_server_handlers_read.go

@@ -270,10 +270,3 @@ func writeResponseContent(filename, mimeType string, rs io.ReadSeeker, w http.Re
 	})
 	return nil
 }
-
-func (vs *VolumeServer) OptionsHandler(w http.ResponseWriter, r *http.Request) {
-	w.Header().Add("Access-Control-Allow-Origin", "*")
-	w.Header().Add("Access-Control-Allow-Methods", "PUT, POST, GET, DELETE, OPTIONS")
-	w.Header().Add("Access-Control-Allow-Headers", "Content-Type")
-	w.Header().Add("Access-Control-Allow-Credentials", "true")
-}