Source: lib/polyfill/patchedmediakeys_nop.js

  1. /**
  2.  * @license
  3.  * Copyright 2016 Google Inc.
  4.  *
  5.  * Licensed under the Apache License, Version 2.0 (the "License");
  6.  * you may not use this file except in compliance with the License.
  7.  * You may obtain a copy of the License at
  8.  *
  9.  *     http://www.apache.org/licenses/LICENSE-2.0
  10.  *
  11.  * Unless required by applicable law or agreed to in writing, software
  12.  * distributed under the License is distributed on an "AS IS" BASIS,
  13.  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  14.  * See the License for the specific language governing permissions and
  15.  * limitations under the License.
  16.  */
  18. goog.provide('shaka.polyfill.PatchedMediaKeysNop');
  20. goog.require('goog.asserts');
  21. goog.require('shaka.log');
  24. /**
  25.  * Install a polyfill to stub out {@link http://goo.gl/blgtZZ EME draft
  26.  * 12 March 2015} on browsers without EME.  All methods will fail.
  27.  */
  28. shaka.polyfill.PatchedMediaKeysNop.install = function() {
  29.   shaka.log.debug('PatchedMediaKeysNop.install');
  31.   // Alias.
  32.   var PatchedMediaKeysNop = shaka.polyfill.PatchedMediaKeysNop;
  34.   // Install patches.
  35.   navigator.requestMediaKeySystemAccess =
  36.       PatchedMediaKeysNop.requestMediaKeySystemAccess;
  37.   // Delete mediaKeys to work around strict mode compatibility issues.
  38.   delete HTMLMediaElement.prototype['mediaKeys'];
  39.   // Work around read-only declaration for mediaKeys by using a string.
  40.   HTMLMediaElement.prototype['mediaKeys'] = null;
  41.   HTMLMediaElement.prototype.setMediaKeys = PatchedMediaKeysNop.setMediaKeys;
  42.   // These are not usable, but allow Player.isBrowserSupported to pass.
  43.   window.MediaKeys = PatchedMediaKeysNop.MediaKeys;
  44.   window.MediaKeySystemAccess = PatchedMediaKeysNop.MediaKeySystemAccess;
  45. };
  48. /**
  49.  * An implementation of navigator.requestMediaKeySystemAccess.
  50.  * Retrieve a MediaKeySystemAccess object.
  51.  *
  52.  * @this {!Navigator}
  53.  * @param {string} keySystem
  54.  * @param {!Array.<!MediaKeySystemConfiguration>} supportedConfigurations
  55.  * @return {!Promise.<!MediaKeySystemAccess>}
  56.  */
  57. shaka.polyfill.PatchedMediaKeysNop.requestMediaKeySystemAccess =
  58.     function(keySystem, supportedConfigurations) {
  59.   shaka.log.debug('PatchedMediaKeysNop.requestMediaKeySystemAccess');
  60.   goog.asserts.assert(this == navigator,
  61.                       'bad "this" for requestMediaKeySystemAccess');
  64.   return Promise.reject(new Error(
  65.       'The key system specified is not supported.'));
  66. };
  69. /**
  70.  * An implementation of HTMLMediaElement.prototype.setMediaKeys.
  71.  * Attach a MediaKeys object to the media element.
  72.  *
  73.  * @this {!HTMLMediaElement}
  74.  * @param {MediaKeys} mediaKeys
  75.  * @return {!Promise}
  76.  */
  77. shaka.polyfill.PatchedMediaKeysNop.setMediaKeys = function(mediaKeys) {
  78.   shaka.log.debug('PatchedMediaKeysNop.setMediaKeys');
  79.   goog.asserts.assert(this instanceof HTMLMediaElement,
  80.                       'bad "this" for setMediaKeys');
  82.   if (mediaKeys == null) {
  83.     return Promise.resolve();
  84.   }
  86.   return Promise.reject(new Error('MediaKeys not supported.'));
  87. };
  91. /**
  92.  * An unusable constructor for MediaKeys.
  93.  * @constructor
  94.  * @struct
  95.  * @implements {MediaKeys}
  96.  */
  97. shaka.polyfill.PatchedMediaKeysNop.MediaKeys = function() {
  98.   throw new TypeError('Illegal constructor.');
  99. };
  102. /** @override */
  103. shaka.polyfill.PatchedMediaKeysNop.MediaKeys.prototype.createSession =
  104.     function() {};
  107. /** @override */
  108. shaka.polyfill.PatchedMediaKeysNop.MediaKeys.prototype.setServerCertificate =
  109.     function() {};
  113. /**
  114.  * An unusable constructor for MediaKeySystemAccess.
  115.  * @constructor
  116.  * @struct
  117.  * @implements {MediaKeySystemAccess}
  118.  */
  119. shaka.polyfill.PatchedMediaKeysNop.MediaKeySystemAccess = function() {
  120.   throw new TypeError('Illegal constructor.');
  121. };
  124. /** @override */
  125. shaka.polyfill.PatchedMediaKeysNop.MediaKeySystemAccess.prototype.
  126.     getConfiguration = function() {};
  129. /** @override */
  130. shaka.polyfill.PatchedMediaKeysNop.MediaKeySystemAccess.prototype.
  131.     createMediaKeys = function() {};
  134. /** @override */
  135. shaka.polyfill.PatchedMediaKeysNop.MediaKeySystemAccess.prototype.
  136.     keySystem;