Handle authentication failures in the v2 app by restarting the app

remoting/webapp/crd/js/oauth2.js

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 /**
  * @fileoverview
  * OAuth2 class that handles retrieval/storage of an OAuth2 token.
  *
  * Uses a content script to trampoline the OAuth redirect page back into the
  * extension context.  This works around the lack of native support for
@@ skipping 274 matching lines @@
     chrome.extension.onMessage.removeListener(oauth2MessageListener);
     sendResponse(null);
   }
   chrome.extension.onMessage.addListener(oauth2MessageListener);
   window.open(GET_CODE_URL, '_blank', 'location=yes,toolbar=no,menubar=no');
 };
 
 /**
  * Redirect page to get a new OAuth Refresh Token.
  *
- * @param {function():void} onDone Completion callback.
- * @return {void} Nothing.
+ * @return {Promise} A promise that resolves when the token is received.
  */
-remoting.OAuth2.prototype.doAuthRedirect = function(onDone) {
+remoting.OAuth2.prototype.handleAuthFailure = function() {
+  var deferred = new base.Deferred();
+
   /** @type {remoting.OAuth2} */
   var that = this;
   /** @param {?string} code */
   var onAuthorizationCode = function(code) {
     if (code) {
-      that.exchangeCodeForToken(code, onDone);
+      that.exchangeCodeForToken(code, deferred.resolve.bind(deferred));
     } else {
-      onDone();
+      deferred.reject(remoting.Error.NOT_AUTHENTICATED);
     }
   };
   this.getAuthorizationCode(onAuthorizationCode);
+
+  return deferred.promise();
 };
 
 /**
+ * Removes the cached token, prompts the user to get the new token and
+ *   relaunches the current window.
+ * @return {void}  Nothing.
+ */
+remoting.OAuth2.prototype.handleAuthFailureAndRelaunch = function() {
+  this.handleAuthFailure().then(function() {
+    window.location.reload();
+  });
+};
+
+/**
  * Asynchronously exchanges an authorization code for a refresh token.
  *
  * @param {string} code The OAuth2 authorization code.
  * @param {function():void} onDone Callback to invoke on completion.
  * @return {void} Nothing.
  */
 remoting.OAuth2.prototype.exchangeCodeForToken = function(code, onDone) {
   /** @param {remoting.Error} error */
   var onError = function(error) {
     console.error('Unable to exchange code for token: ', error);
@@ skipping 134 matching lines @@
  * @return {?string} The user's full name, if it has been cached by a previous
  * call to getUserInfo, otherwise null.
  */
 remoting.OAuth2.prototype.getCachedUserFullName = function() {
   var value = window.localStorage.getItem(this.KEY_FULLNAME_);
   if (typeof value == 'string') {
     return value;
   }
   return null;
 };