Hangouts remote desktop part III - It2MeService

remoting/webapp/remoting.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.
 
 'use strict';
 
 /** @suppress {duplicate} */
 var remoting = remoting || {};
 
 /** @type {remoting.HostSession} */ remoting.hostSession = null;
@@ skipping 115 matching lines @@
   remoting.initModalDialogs();
 
   if (isHostModeSupported_()) {
     var noShare = document.getElementById('chrome-os-no-share');
     noShare.parentNode.removeChild(noShare);
   } else {
     var button = document.getElementById('share-button');
     button.disabled = true;
   }
 
+  /**
+   * @return {Promise} A promise that resolves to the id of the current
+   * containing tab/window.
+   */
+  var getCurrentId = function () {
+    if (remoting.isAppsV2) {
+      return Promise.resolve(chrome.app.window.current().id);
+    }
+
+    /**
+     * @param {function(*=):void} resolve
+     * @param {function(*=):void} reject
+     */
+    return new Promise(function(resolve, reject) {
+      /** @param {chrome.Tab} tab */
+      chrome.tabs.getCurrent(function(tab){
+        if (tab) {
+          resolve(String(tab.id));
+        }
+        reject('Cannot retrieve the current tab.');
+      });
+    });
+  };
+
   var onLoad = function() {
     // Parse URL parameters.
     var urlParams = getUrlParameters_();
     if ('mode' in urlParams) {
-      if (urlParams['mode'] == 'me2me') {
+      if (urlParams['mode'] === 'me2me') {
         var hostId = urlParams['hostId'];
         remoting.connectMe2Me(hostId);
         return;
-      } else if (urlParams['mode'] == 'hangout') {
-        var accessCode = urlParams['accessCode'];
-        remoting.ensureSessionConnector_();
-        remoting.setMode(remoting.AppMode.CLIENT_CONNECTING);
-        remoting.connector.connectIT2Me(accessCode);
+      } else if (urlParams['mode'] === 'hangout') {
+        /** @param {*} id */
+        getCurrentId().then(function(id) {
+          /** @type {string} */
+          var accessCode = urlParams['accessCode'];
+          remoting.ensureSessionConnector_();
+          remoting.setMode(remoting.AppMode.CLIENT_CONNECTING);
+          remoting.connector.connectIT2Me(accessCode);
 
-        document.body.classList.add('hangout-remote-desktop');
-        var hangoutSession = new remoting.HangoutSession();
-        hangoutSession.init();
+          document.body.classList.add('hangout-remote-desktop');
+          var senderId = /** @type {string} */ String(id);
+          var hangoutSession = new remoting.HangoutSession(senderId);
+          hangoutSession.init();
+        });
         return;
       }
     }
     // No valid URL parameters, start up normally.
     remoting.initHomeScreenUi();
   }
   remoting.hostList.load(onLoad);
 
   // For Apps v1, check the tab type to warn the user if they are not getting
   // the best keyboard experience.
@@ skipping 402 matching lines @@
 }
 
 /**
  * Tests whether we are running on ChromeOS.
  *
  * @return {boolean} True if the platform is ChromeOS.
  */
 remoting.platformIsChromeOS = function() {
   return navigator.userAgent.match(/\bCrOS\b/) != null;
 }