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// Copyright 2014 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.
/**
* Discover the ID of installed cast extension.
* @constructor
* @struct
*/
function CastExtensionDiscoverer() {}
/**
* Tentatice IDs to try.
* @type {!Array<string>}
* @const
*/
CastExtensionDiscoverer.CAST_EXTENSION_IDS = [
'pkedcjkdefgpdelpbcmbmeomcjbeemfm', // MR official
'boadgeojelhgndaghljhdicfkmllpafd', // release
'dliochdbjfkdbacpmhlcpmleaejidimm', // beta
'enhhojjnijigcajfphajepfemndkmdlo', // dev
'fmfcbgogabcbclcofgocippekhfcmgfj', // staging
'fjhoaacokmgbjemoflkofnenfaiekifl' // stable used during MR development.
];
/**
* @param {function(?string)} callback Callback called with the extension ID.
* The ID may be null if extension is not found.
*/
CastExtensionDiscoverer.findInstalledExtension = function(callback) {
CastExtensionDiscoverer.findInstalledExtensionHelper_(0, callback);
};
/**
* @param {number} index Current index which is tried to check.
* @param {function(?string)} callback Callback function which will be called
* the extension is found.
* @private
*/
CastExtensionDiscoverer.findInstalledExtensionHelper_ = function(index,
callback) {
if (index === CastExtensionDiscoverer.CAST_EXTENSION_IDS.length) {
// no extension found.
callback(null);
return;
}
CastExtensionDiscoverer.isExtensionInstalled_(
CastExtensionDiscoverer.CAST_EXTENSION_IDS[index],
function(installed) {
if (installed) {
callback(CastExtensionDiscoverer.CAST_EXTENSION_IDS[index]);
} else {
CastExtensionDiscoverer.findInstalledExtensionHelper_(index + 1,
callback);
}
});
};
/**
* The result will be notified on |callback|. True if installed, false not.
* @param {string} extensionId Id to be checked.
* @param {function(boolean)} callback Callback to notify the result.
* @private
*/
CastExtensionDiscoverer.isExtensionInstalled_ =
function(extensionId, callback) {
var xhr = new XMLHttpRequest();
var url = 'chrome-extension://' + extensionId + '/cast_sender.js';
xhr.open('GET', url, true);
xhr.onerror = function() { callback(false); };
/** @param {*} event */
xhr.onreadystatechange = function(event) {
if (xhr.readyState == 4 && xhr.status === 200) {
// Cast extension found.
callback(true);
}
}.wrap(this);
xhr.send();
};
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