chrome/renderer/resources/extensions/webstore_custom_bindings.js

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 // Custom binding for the webstore API.
   6
   7 var webstoreNatives = requireNative('webstore');
   8 var Event = require('event_bindings').Event;
   9
  10 function Installer() {
  11   this._pendingInstall = null;
  12   this.onInstallStageChanged =
  13       new Event(null, [{name: 'stage', type: 'string'}], {unmanaged: true});
  14   this.onDownloadProgress =
  15       new Event(null, [{name: 'progress', type: 'number'}], {unmanaged: true});
  16 }
  17
  18 Installer.prototype.install = function(url, onSuccess, onFailure) {
  19   if (this._pendingInstall)
  20     throw new Error('A Chrome Web Store installation is already pending.');
  21   if (url !== undefined && typeof(url) !== 'string') {
  22     throw new Error(
  23         'The Chrome Web Store item link URL parameter must be a string.');
  24   }
  25   if (onSuccess !== undefined && typeof(onSuccess) !== 'function')
  26     throw new Error('The success callback parameter must be a function.');
  27   if (onFailure !== undefined && typeof(onFailure) !== 'function')
  28     throw new Error('The failure callback parameter must be a function.');
  29
  30   // Since we call Install() with a bool for if we have listeners, listeners
  31   // must be set prior to the inline installation starting (this is also
  32   // noted in the Event documentation in
  33   // chrome/common/extensions/api/webstore.json).
  34   var installId = webstoreNatives.Install(
  35       this.onInstallStageChanged.hasListeners(),
  36       this.onDownloadProgress.hasListeners(),
  37       url,
  38       onSuccess,
  39       onFailure);
  40   if (installId !== undefined) {
  41     this._pendingInstall = {
  42       installId: installId,
  43       onSuccess: onSuccess,
  44       onFailure: onFailure
  45     };
  46   }
  47 };
  48
  49 Installer.prototype.onInstallResponse = function(installId, success, error) {
  50   var pendingInstall = this._pendingInstall;
  51   if (!pendingInstall || pendingInstall.installId != installId) {
  52     // TODO(kalman): should this be an error?
  53     return;
  54   }
  55
  56   try {
  57     if (success && pendingInstall.onSuccess)
  58       pendingInstall.onSuccess();
  59     else if (!success && pendingInstall.onFailure)
  60       pendingInstall.onFailure(error);
  61   } catch (e) {
  62     console.error('Exception in chrome.webstore.install response handler: ' +
  63                   e.stack);
  64   } finally {
  65     this._pendingInstall = null;
  66   }
  67 };
  68
  69 Installer.prototype.onInstallStageChanged = function(installStage) {
  70   this.onInstallStageChanged.dispatch(installStage);
  71 };
  72
  73 Installer.prototype.onDownloadProgress = function(progress) {
  74   this.onDownloadProgress.dispatch(progress);
  75 };
  76
  77 var installer = new Installer();
  78
  79 var chromeWebstore = {
  80   install: function (url, onSuccess, onFailure) {
  81     installer.install(url, onSuccess, onFailure);
  82   },
  83   onInstallStageChanged: installer.onInstallStageChanged,
  84   onDownloadProgress: installer.onDownloadProgress
  85 };
  86
  87 exports.binding = chromeWebstore;
  88
  89 // Called by webstore_bindings.cc.
  90 exports.onInstallResponse =
  91     Installer.prototype.onInstallResponse.bind(installer);
  92 exports.onInstallStageChanged =
  93     Installer.prototype.onInstallStageChanged.bind(installer);
  94 exports.onDownloadProgress =
  95     Installer.prototype.onDownloadProgress.bind(installer);