remoting/webapp/wcs_sandbox_content.js

   1 /* Copyright 2013 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
   6 /**
   7  * @fileoverview
   8  * The sandbox side of the application/sandbox WCS interface, used by the
   9  * sandbox to exchange messages with the application.
  10  */
  11
  12 'use strict';
  13
  14 /** @suppress {duplicate} */
  15 var remoting = remoting || {};
  16
  17 /** @constructor */
  18 remoting.WcsSandboxContent = function() {
  19   /**
  20    * @type {Window}
  21    * @private
  22    */
  23   this.parentWindow_ = null;
  24   /**
  25    * @type {number}
  26    * @private
  27    */
  28   this.nextXhrId_ = 0;
  29   /**
  30    * @type {Object.<number, XMLHttpRequest>}
  31    * @private
  32    */
  33   this.pendingXhrs_ = {};
  34
  35   window.addEventListener('message', this.onMessage_.bind(this), false);
  36 };
  37
  38 /**
  39  * Event handler to process messages from the application.
  40  *
  41  * @param {Event} event
  42  */
  43 remoting.WcsSandboxContent.prototype.onMessage_ = function(event) {
  44   this.parentWindow_ = event.source;
  45
  46   switch (event.data['command']) {
  47
  48     case 'proxyXhrs':
  49       // Since the WCS driver code constructs XHRs directly, the only
  50       // mechanism for proxying them is to replace the XMLHttpRequest
  51       // constructor.
  52       XMLHttpRequest = remoting.XMLHttpRequestProxy;
  53       break;
  54
  55     case 'sendIq':
  56       /** @type {string} */
  57       var stanza = event.data['stanza'];
  58       if (stanza === undefined) {
  59         console.error('sendIq: missing IQ stanza.');
  60         break;
  61       }
  62       if (remoting.wcs) {
  63         remoting.wcs.sendIq(stanza);
  64       } else {
  65         console.error('Dropping IQ stanza:', stanza);
  66       }
  67       break;
  68
  69     case 'setAccessToken':
  70       /** @type {string} */
  71       var token = event.data['token'];
  72       if (token === undefined) {
  73         console.error('setAccessToken: missing access token.');
  74         break;
  75       }
  76       // The WCS driver JS requires that remoting.wcsLoader be a global
  77       // variable, so it can't be a member of this class.
  78       // TODO(jamiewalch): remoting.wcs doesn't need to be global and should
  79       // be made a member (http://crbug.com/172348).
  80       if (remoting.wcs) {
  81         remoting.wcs.updateAccessToken(token);
  82       } else if (!remoting.wcsLoader) {
  83         remoting.wcsLoader = new remoting.WcsLoader();
  84         remoting.wcsLoader.start(token,
  85                                  this.onLocalJid_.bind(this),
  86                                  this.onError_.bind(this));
  87       }
  88       break;
  89
  90     case 'xhrStateChange':
  91       /** @type {number} */
  92       var id = event.data['id'];
  93       if (id === undefined) {
  94         console.error('xhrStateChange: missing id.');
  95         break;
  96       }
  97       var pendingXhr = this.pendingXhrs_[id];
  98       if (!pendingXhr) {
  99         console.error('xhrStateChange: unrecognized id:', id);
 100         break;
 101       }
 102       /** @type {XMLHttpRequest} */
 103       var xhr = event.data['xhr'];
 104       if (xhr === undefined) {
 105         console.error('xhrStateChange: missing xhr');
 106         break;
 107       }
 108       for (var member in xhr) {
 109         pendingXhr[member] = xhr[member];
 110       }
 111       if (xhr.readyState == 4) {
 112         delete this.pendingXhrs_[id];
 113       }
 114       if (pendingXhr.onreadystatechange) {
 115         pendingXhr.onreadystatechange();
 116       }
 117       break;
 118
 119     default:
 120       console.error('Unexpected message:', event.data['command'], event.data);
 121   }
 122 };
 123
 124 /**
 125  * Callback method to indicate that the WCS driver has loaded and provide the
 126  * full JID of the client.
 127  *
 128  * @param {string} localJid The full JID of the WCS client.
 129  * @private
 130  */
 131 remoting.WcsSandboxContent.prototype.onLocalJid_ = function(localJid) {
 132   remoting.wcs.setOnIq(this.onIq_.bind(this));
 133   var message = {
 134     'command': 'onLocalJid',
 135     'localJid': localJid
 136   };
 137   this.parentWindow_.postMessage(message, '*');
 138 };
 139
 140 /**
 141  * Callback method to indicate that something went wrong loading the WCS driver.
 142  *
 143  * @param {remoting.Error} error Details of the error.
 144  * @private
 145  */
 146 remoting.WcsSandboxContent.prototype.onError_ = function(error) {
 147   var message = {
 148     'command': 'onError',
 149     'error': error
 150   };
 151   this.parentWindow_.postMessage(message, '*');
 152 };
 153
 154 /**
 155  * Forward an XHR to the container process to send. This is analogous to XHR's
 156  * send method.
 157  *
 158  * @param {remoting.XMLHttpRequestProxy} xhr The XHR to send.
 159  * @return {number} The unique ID allocated to the XHR. Used to abort it.
 160  */
 161 remoting.WcsSandboxContent.prototype.sendXhr = function(xhr) {
 162   var id = this.nextXhrId_++;
 163   this.pendingXhrs_[id] = xhr;
 164   var message = {
 165     'command': 'sendXhr',
 166     'id': id,
 167     'parameters': xhr.sandbox_ipc
 168   };
 169   this.parentWindow_.postMessage(message, '*');
 170   delete xhr.sandbox_ipc;
 171   return id;
 172 };
 173
 174 /**
 175  * Abort a forwarded XHR. This is analogous to XHR's abort method.
 176  *
 177  * @param {number} id The unique ID of the XHR to abort, as returned by sendXhr.
 178  */
 179 remoting.WcsSandboxContent.prototype.abortXhr = function(id) {
 180   if (!this.pendingXhrs_[id]) {
 181     // The XHR is removed when it reaches the "ready" state. Calling abort
 182     // subsequently is unusual, but legal, so just silently ignore the request
 183     // in this case.
 184     return;
 185   }
 186   var message = {
 187     'command': 'abortXhr',
 188     'id': id
 189   };
 190   this.parentWindow_.postMessage(message, '*');
 191 };
 192
 193 /**
 194  * Callback to indicate than an IQ stanza has been received from the WCS
 195  * driver, and should be forwarded to the main process.
 196  *
 197  * @param {string} stanza
 198  * @private
 199  */
 200 remoting.WcsSandboxContent.prototype.onIq_ = function(stanza) {
 201   remoting.wcs.setOnIq(this.onIq_.bind(this));
 202   var message = {
 203     'command': 'onIq',
 204     'stanza': stanza
 205   };
 206   this.parentWindow_.postMessage(message, '*');
 207 };
 208
 209 /**
 210  * Entry point for the WCS sandbox process.
 211  */
 212 function onSandboxInit() {
 213   // The WCS code registers for a couple of events that aren't supported in
 214   // Apps V2, so ignore those for now.
 215   var oldAEL = window.addEventListener;
 216   window.addEventListener = function(type, listener, useCapture) {
 217     if (type == 'beforeunload' || type == 'unload') {
 218       return;
 219     }
 220     oldAEL(type, listener, useCapture);
 221   };
 222
 223   remoting.settings = new remoting.Settings();
 224   remoting.sandboxContent = new remoting.WcsSandboxContent();
 225 }
 226
 227 window.addEventListener('load', onSandboxInit, false);
 228
 229 /** @type {remoting.WcsSandboxContent} */
 230 remoting.sandboxContent = null;