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/* 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
* A class that loads a WCS IQ client and constructs remoting.wcs as a
* wrapper for it.
*/
'use strict';
/** @suppress {duplicate} */
var remoting = remoting || {};
/** @type {remoting.WcsLoader} */
remoting.wcsLoader = null;
/**
* @constructor
* @private
*/
remoting.WcsLoader = function() {
/**
* The WCS client that will be downloaded. This variable is initialized (via
* remoting.wcsLoader) by the downloaded Javascript.
* @type {remoting.WcsIqClient}
*/
this.wcsIqClient = null;
};
/**
* Load WCS if necessary, then invoke the callback with an access token.
*
* @param {function(string?): void} onReady The callback function, called with
* an OAuth2 access token when WCS has been loaded, or with null on error.
* @return {void} Nothing.
*/
remoting.WcsLoader.load = function(onReady) {
if (!remoting.wcsLoader) {
remoting.wcsLoader = new remoting.WcsLoader();
}
/** @param {string?} token The OAuth2 access token. */
var start = function(token) {
if (token) {
remoting.wcsLoader.start_(token, onReady);
} else {
console.error('WcsLoader: Authentication failed.');
onReady(null);
}
};
remoting.oauth2.callWithToken(start);
};
/**
* The URL of the GTalk gadget.
* @type {string}
* @private
*/
remoting.WcsLoader.prototype.TALK_GADGET_URL_ =
'https://talkgadget.google.com/talkgadget/';
/**
* The id of the script node.
* @type {string}
* @private
*/
remoting.WcsLoader.prototype.SCRIPT_NODE_ID_ = 'wcs-script-node';
/**
* The attribute name indicating that the WCS has finished loading.
* @type {string}
* @private
*/
remoting.WcsLoader.prototype.SCRIPT_NODE_LOADED_FLAG_ = 'wcs-script-loaded';
/**
* Starts loading the WCS IQ client.
*
* When it's loaded, construct remoting.wcs as a wrapper for it.
* When the WCS connection is ready, or on error, call |onReady|.
*
* @param {string} token An OAuth2 access token.
* @param {function(string?): void} onReady The callback function, called with
* an OAuth2 access token when WCS has been loaded, or with null on error.
* @return {void} Nothing.
* @private
*/
remoting.WcsLoader.prototype.start_ = function(token, onReady) {
var node = document.getElementById(this.SCRIPT_NODE_ID_);
if (!node) {
// The first time, there will be no script node, so create one.
node = document.createElement('script');
node.id = this.SCRIPT_NODE_ID_;
node.src = this.TALK_GADGET_URL_ + 'iq?access_token=' + token;
node.type = 'text/javascript';
document.body.insertBefore(node, document.body.firstChild);
} else if (node.hasAttribute(this.SCRIPT_NODE_LOADED_FLAG_)) {
// Subsequently, explicitly invoke onReady if onload has already fired.
// TODO(jamiewalch): It's possible that the WCS client has not finished
// initializing. Add support for multiple callbacks to the remoting.Wcs
// class to address this.
onReady(token);
return;
}
/** @type {remoting.WcsLoader} */
var that = this;
var onLoad = function() {
var typedNode = /** @type {Element} */ (node);
typedNode.setAttribute(that.SCRIPT_NODE_LOADED_FLAG_, true);
that.constructWcs_(token, onReady);
};
var onError = function() {
var typedNode = /** @type {Element} */ (node);
typedNode.parentNode.removeChild(node);
onReady(null);
};
node.addEventListener('load', onLoad, false);
node.addEventListener('error', onError, false);
};
/**
* Constructs the remoting.wcs object.
*
* @param {string} token An OAuth2 access token.
* @param {function(string?): void} onReady The callback function, called with
* an OAuth2 access token when WCS has been loaded, or with null on error.
* @return {void} Nothing.
* @private
*/
remoting.WcsLoader.prototype.constructWcs_ = function(token, onReady) {
remoting.wcs = new remoting.Wcs(
remoting.wcsLoader.wcsIqClient,
token,
function() { onReady(token); });
};
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