Refactoring download button logic

web/firefoxcom.js

@@ -1,3 +1,4 @@
+/* -*- Mode: Java; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
 /* Copyright 2012 Mozilla Foundation
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
@@ -13,9 +14,9 @@
  * limitations under the License.
  */
 
-var FirefoxCom = (function FirefoxComClosure() {
-  'use strict';
+'use strict';
 
+var FirefoxCom = (function FirefoxComClosure() {
   return {
     /**
      * Creates an event that the extension is listening for and will
@@ -69,3 +70,35 @@ var FirefoxCom = (function FirefoxComClosure() {
     }
   };
 })();
+
+var DownloadManager = (function DownloadManagerClosure() {
+  function DownloadManager() {}
+
+  DownloadManager.prototype = {
+    downloadUrl: function DownloadManager_downloadUrl(url) {
+      FirefoxCom.request('download', {
+        originalUrl: url,
+        filename: this.filename
+      });
+    },
+
+    download: function DownloadManager_download(blob, url) {
+      var blobUrl = window.URL.createObjectURL(blob);
+
+      FirefoxCom.request('download', {
+        blobUrl: blobUrl,
+        originalUrl: url,
+        filename: this.filename
+      },
+        function response(err) {
+          if (err && this.onerror) {
+            this.onerror(err);
+          }
+          window.URL.revokeObjectURL(blobUrl);
+        }.bind(this)
+      );
+    }
+  };
+
+  return DownloadManager;
+})();