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/* Copyright 2013 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
* The sandbox side of the application/sandbox WCS interface, used by the
* sandbox to exchange messages with the application.
*/
'use strict';
/** @suppress {duplicate} */
var remoting = remoting || {};
/** @constructor */
remoting.WcsSandboxContent = function() {
/**
* @type {Window}
* @private
*/
this.parentWindow_ = null;
/**
* @type {number}
* @private
*/
this.nextXhrId_ = 0;
/**
* @type {Object.<number, XMLHttpRequest>}
* @private
*/
this.pendingXhrs_ = {};
window.addEventListener('message', this.onMessage_.bind(this), false);
};
/**
* Event handler to process messages from the application.
*
* @param {Event} event
*/
remoting.WcsSandboxContent.prototype.onMessage_ = function(event) {
this.parentWindow_ = event.source;
switch (event.data['command']) {
case 'proxyXhrs':
// Since the WCS driver code constructs XHRs directly, the only
// mechanism for proxying them is to replace the XMLHttpRequest
// constructor.
XMLHttpRequest = remoting.XMLHttpRequestProxy;
break;
case 'sendIq':
/** @type {string} */
var stanza = event.data['stanza'];
if (stanza === undefined) {
console.error('sendIq: missing IQ stanza.');
break;
}
if (remoting.wcs) {
remoting.wcs.sendIq(stanza);
} else {
console.error('Dropping IQ stanza:', stanza);
}
break;
case 'setAccessToken':
/** @type {string} */
var token = event.data['token'];
if (token === undefined) {
console.error('setAccessToken: missing access token.');
break;
}
// The WCS driver JS requires that remoting.wcsLoader be a global
// variable, so it can't be a member of this class.
// TODO(jamiewalch): remoting.wcs doesn't need to be global and should
// be made a member (http://crbug.com/172348).
if (remoting.wcs) {
remoting.wcs.updateAccessToken(token);
} else if (!remoting.wcsLoader) {
remoting.wcsLoader = new remoting.WcsLoader();
remoting.wcsLoader.start(token,
this.onLocalJid_.bind(this),
this.onError_.bind(this));
}
break;
case 'xhrStateChange':
/** @type {number} */
var id = event.data['id'];
if (id === undefined) {
console.error('xhrStateChange: missing id.');
break;
}
var pendingXhr = this.pendingXhrs_[id];
if (!pendingXhr) {
console.error('xhrStateChange: unrecognized id:', id);
break;
}
/** @type {XMLHttpRequest} */
var xhr = event.data['xhr'];
if (xhr === undefined) {
console.error('xhrStateChange: missing xhr');
break;
}
for (var member in xhr) {
pendingXhr[member] = xhr[member];
}
if (xhr.readyState == 4) {
delete this.pendingXhrs_[id];
}
if (pendingXhr.onreadystatechange) {
pendingXhr.onreadystatechange();
}
break;
default:
console.error('Unexpected message:', event.data['command'], event.data);
}
};
/**
* Callback method to indicate that the WCS driver has loaded and provide the
* full JID of the client.
*
* @param {string} localJid The full JID of the WCS client.
* @private
*/
remoting.WcsSandboxContent.prototype.onLocalJid_ = function(localJid) {
remoting.wcs.setOnIq(this.onIq_.bind(this));
var message = {
'command': 'onLocalJid',
'localJid': localJid
};
this.parentWindow_.postMessage(message, '*');
};
/**
* Callback method to indicate that something went wrong loading the WCS driver.
*
* @param {remoting.Error} error Details of the error.
* @private
*/
remoting.WcsSandboxContent.prototype.onError_ = function(error) {
var message = {
'command': 'onError',
'error': error
};
this.parentWindow_.postMessage(message, '*');
};
/**
* Forward an XHR to the container process to send. This is analogous to XHR's
* send method.
*
* @param {remoting.XMLHttpRequestProxy} xhr The XHR to send.
* @return {number} The unique ID allocated to the XHR. Used to abort it.
*/
remoting.WcsSandboxContent.prototype.sendXhr = function(xhr) {
var id = this.nextXhrId_++;
this.pendingXhrs_[id] = xhr;
var message = {
'command': 'sendXhr',
'id': id,
'parameters': xhr.sandbox_ipc
};
this.parentWindow_.postMessage(message, '*');
delete xhr.sandbox_ipc;
return id;
};
/**
* Abort a forwarded XHR. This is analogous to XHR's abort method.
*
* @param {number} id The unique ID of the XHR to abort, as returned by sendXhr.
*/
remoting.WcsSandboxContent.prototype.abortXhr = function(id) {
if (!this.pendingXhrs_[id]) {
// The XHR is removed when it reaches the "ready" state. Calling abort
// subsequently is unusual, but legal, so just silently ignore the request
// in this case.
return;
}
var message = {
'command': 'abortXhr',
'id': id
};
this.parentWindow_.postMessage(message, '*');
};
/**
* Callback to indicate than an IQ stanza has been received from the WCS
* driver, and should be forwarded to the main process.
*
* @param {string} stanza
* @private
*/
remoting.WcsSandboxContent.prototype.onIq_ = function(stanza) {
remoting.wcs.setOnIq(this.onIq_.bind(this));
var message = {
'command': 'onIq',
'stanza': stanza
};
this.parentWindow_.postMessage(message, '*');
};
/**
* Entry point for the WCS sandbox process.
*/
function onSandboxInit() {
// The WCS code registers for a couple of events that aren't supported in
// Apps V2, so ignore those for now.
var oldAEL = window.addEventListener;
window.addEventListener = function(type, listener, useCapture) {
if (type == 'beforeunload' || type == 'unload') {
return;
}
oldAEL(type, listener, useCapture);
};
remoting.settings = new remoting.Settings();
remoting.sandboxContent = new remoting.WcsSandboxContent();
}
window.addEventListener('load', onSandboxInit, false);
/** @type {remoting.WcsSandboxContent} */
remoting.sandboxContent = null;
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