access crm attachment through our server as a proxy.

crmAttachment_test.go

 
 func TestCRMDownloadAttachment(t *testing.T) {
 	SetupConfig()
-	crmDownloadAttachment("591ef9c61d6ca779c")
-	crmDownloadAttachmentAs("591ef9c61d6ca779c", "/tmp/wechat_hitxy_测试")
+	id := "59054884ef1b0c04f"
+	//crmDownloadAttachment(id)
+	crmDownloadAttachmentAs(id, "/tmp/wechat_hitxy_测试")
 }

fileinfo.go

 	info.Size, err = getFileSize(path)
 	return
 }
+
+func isFileExist(path string) bool {
+	if _, err := os.Stat(path); os.IsNotExist(err) {
+		// path/to/whatever does not exist
+		return false
+	}
+	return true
+}

main.go

 	//http.HandleFunc("/", webrootHandler)
 	http.HandleFunc("/api", apiV1Main)
 	http.HandleFunc("/upload", uploadHandler)
+	http.HandleFunc("/crmfiles/", crmAttachmentHandler)
 	http.ListenAndServe(":65500", nil)
 }

server.go

 	io.Copy(f, file)
 }
 
-func crmAttachmentHandler(w http.Response, r *http.Request) {
-	http.ServeFile(w, r)
+func crmAttachmentHandler(w http.ResponseWriter, r *http.Request) {
+	fileID := getCrmFileID(r.URL.Path)
+	saveAs := GlobalPath.CRMAttachment + "crm_attach_" + fileID //add prefix for easy deleting
+	if fileID == "" {
+		log.Println("invalid fileID")
+		response404Handler(w)
+		return
+	}
+	log.Printf("download %s => %s", fileID, saveAs)
+	crmDownloadAttachmentAs(fileID, saveAs)
+	if !isFileExist(saveAs) {
+		response404Handler(w)
+		return
+	}
+	http.ServeFile(w, r, saveAs)
+}
+
+func getCrmFileID(urlPath string) string {
+	return strings.TrimPrefix(urlPath, "/crmfiles/")
+}
+
+func response404Handler(w http.ResponseWriter) {
+	w.WriteHeader(http.StatusNotFound)
+	fmt.Fprintf(w, "not found")
 }