/**
* @license
* Copyright 2016 Google Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
goog.provide('shaka.polyfill.PatchedMediaKeysWebkit');
goog.require('goog.asserts');
goog.require('shaka.log');
goog.require('shaka.polyfill.register');
goog.require('shaka.util.EventManager');
goog.require('shaka.util.FakeEvent');
goog.require('shaka.util.FakeEventTarget');
goog.require('shaka.util.PublicPromise');
goog.require('shaka.util.StringUtils');
goog.require('shaka.util.Uint8ArrayUtils');
/**
* @namespace shaka.polyfill.PatchedMediaKeysWebkit
*
* @summary A polyfill to implement
* {@link http://goo.gl/blgtZZ EME draft 12 March 2015} on top of
* webkit-prefixed {@link http://goo.gl/FSpoAo EME v0.1b}.
*/
/**
* Store api prefix.
*
* @private {string}
*/
shaka.polyfill.PatchedMediaKeysWebkit.prefix_ = '';
/**
* Installs the polyfill if needed.
*/
shaka.polyfill.PatchedMediaKeysWebkit.install = function() {
// Alias.
const PatchedMediaKeysWebkit = shaka.polyfill.PatchedMediaKeysWebkit;
const prefixApi = PatchedMediaKeysWebkit.prefixApi_;
if (!window.HTMLVideoElement ||
(navigator.requestMediaKeySystemAccess &&
MediaKeySystemAccess.prototype.getConfiguration)) {
return;
}
if (HTMLMediaElement.prototype.webkitGenerateKeyRequest) {
shaka.log.info('Using webkit-prefixed EME v0.1b');
PatchedMediaKeysWebkit.prefix_ = 'webkit';
} else if (HTMLMediaElement.prototype.generateKeyRequest) {
shaka.log.info('Using nonprefixed EME v0.1b');
} else {
return;
}
goog.asserts.assert(
HTMLMediaElement.prototype[prefixApi('generateKeyRequest')],
'PatchedMediaKeysWebkit APIs not available!');
// Construct a fake key ID. This is not done at load-time to avoid exceptions
// on unsupported browsers. This particular fake key ID was suggested in
// w3c/encrypted-media#32.
PatchedMediaKeysWebkit.MediaKeyStatusMap.KEY_ID_ =
(new Uint8Array([0])).buffer;
// Install patches.
navigator.requestMediaKeySystemAccess =
PatchedMediaKeysWebkit.requestMediaKeySystemAccess;
// Delete mediaKeys to work around strict mode compatibility issues.
delete HTMLMediaElement.prototype['mediaKeys'];
// Work around read-only declaration for mediaKeys by using a string.
HTMLMediaElement.prototype['mediaKeys'] = null;
HTMLMediaElement.prototype.setMediaKeys = PatchedMediaKeysWebkit.setMediaKeys;
window.MediaKeys = PatchedMediaKeysWebkit.MediaKeys;
window.MediaKeySystemAccess = PatchedMediaKeysWebkit.MediaKeySystemAccess;
};
/**
* Prefix the api with the stored prefix.
*
* @param {string} api
* @return {string}
* @private
*/
shaka.polyfill.PatchedMediaKeysWebkit.prefixApi_ = function(api) {
let prefix = shaka.polyfill.PatchedMediaKeysWebkit.prefix_;
if (prefix) {
return prefix + api.charAt(0).toUpperCase() + api.slice(1);
}
return api;
};
/**
* An implementation of navigator.requestMediaKeySystemAccess.
* Retrieves a MediaKeySystemAccess object.
*
* @this {!Navigator}
* @param {string} keySystem
* @param {!Array.<!MediaKeySystemConfiguration>} supportedConfigurations
* @return {!Promise.<!MediaKeySystemAccess>}
*/
shaka.polyfill.PatchedMediaKeysWebkit.requestMediaKeySystemAccess =
function(keySystem, supportedConfigurations) {
shaka.log.debug('PatchedMediaKeysWebkit.requestMediaKeySystemAccess');
goog.asserts.assert(this == navigator,
'bad "this" for requestMediaKeySystemAccess');
// Alias.
const PatchedMediaKeysWebkit = shaka.polyfill.PatchedMediaKeysWebkit;
try {
let access = new PatchedMediaKeysWebkit.MediaKeySystemAccess(
keySystem, supportedConfigurations);
return Promise.resolve(/** @type {!MediaKeySystemAccess} */ (access));
} catch (exception) {
return Promise.reject(exception);
}
};
/**
* An implementation of HTMLMediaElement.prototype.setMediaKeys.
* Attaches a MediaKeys object to the media element.
*
* @this {!HTMLMediaElement}
* @param {MediaKeys} mediaKeys
* @return {!Promise}
*/
shaka.polyfill.PatchedMediaKeysWebkit.setMediaKeys = function(mediaKeys) {
shaka.log.debug('PatchedMediaKeysWebkit.setMediaKeys');
goog.asserts.assert(this instanceof HTMLMediaElement,
'bad "this" for setMediaKeys');
// Alias.
const PatchedMediaKeysWebkit = shaka.polyfill.PatchedMediaKeysWebkit;
let newMediaKeys =
/** @type {shaka.polyfill.PatchedMediaKeysWebkit.MediaKeys} */ (
mediaKeys);
let oldMediaKeys =
/** @type {shaka.polyfill.PatchedMediaKeysWebkit.MediaKeys} */ (
this.mediaKeys);
if (oldMediaKeys && oldMediaKeys != newMediaKeys) {
goog.asserts.assert(
oldMediaKeys instanceof PatchedMediaKeysWebkit.MediaKeys,
'non-polyfill instance of oldMediaKeys');
// Have the old MediaKeys stop listening to events on the video tag.
oldMediaKeys.setMedia(null);
}
delete this['mediaKeys']; // In case there is an existing getter.
this['mediaKeys'] = mediaKeys; // Work around the read-only declaration.
if (newMediaKeys) {
goog.asserts.assert(
newMediaKeys instanceof PatchedMediaKeysWebkit.MediaKeys,
'non-polyfill instance of newMediaKeys');
newMediaKeys.setMedia(this);
}
return Promise.resolve();
};
/**
* For some of this polyfill's implementation, we need to query a video element.
* But for some embedded systems, it is memory-expensive to create multiple
* video elements. Therefore, we check the document to see if we can borrow one
* to query before we fall back to creating one temporarily.
*
* @return {!HTMLVideoElement}
* @private
*/
shaka.polyfill.PatchedMediaKeysWebkit.getVideoElement_ = function() {
let videos = document.getElementsByTagName('video');
let tmpVideo = videos.length ? videos[0] : document.createElement('video');
return /** @type {!HTMLVideoElement} */(tmpVideo);
};
/**
* An implementation of MediaKeySystemAccess.
*
* @constructor
* @struct
* @param {string} keySystem
* @param {!Array.<!MediaKeySystemConfiguration>} supportedConfigurations
* @implements {MediaKeySystemAccess}
* @throws {Error} if the key system is not supported.
*/
shaka.polyfill.PatchedMediaKeysWebkit.MediaKeySystemAccess =
function(keySystem, supportedConfigurations) {
shaka.log.debug('PatchedMediaKeysWebkit.MediaKeySystemAccess');
/** @type {string} */
this.keySystem = keySystem;
/** @private {string} */
this.internalKeySystem_ = keySystem;
/** @private {!MediaKeySystemConfiguration} */
this.configuration_;
// This is only a guess, since we don't really know from the prefixed API.
let allowPersistentState = false;
if (keySystem == 'org.w3.clearkey') {
// ClearKey's string must be prefixed in v0.1b.
this.internalKeySystem_ = 'webkit-org.w3.clearkey';
// ClearKey doesn't support persistence.
allowPersistentState = false;
}
let success = false;
let tmpVideo = shaka.polyfill.PatchedMediaKeysWebkit.getVideoElement_();
for (let i = 0; i < supportedConfigurations.length; ++i) {
let cfg = supportedConfigurations[i];
// Create a new config object and start adding in the pieces which we
// find support for. We will return this from getConfiguration() if asked.
/** @type {!MediaKeySystemConfiguration} */
let newCfg = {
'audioCapabilities': [],
'videoCapabilities': [],
// It is technically against spec to return these as optional, but we
// don't truly know their values from the prefixed API:
'persistentState': 'optional',
'distinctiveIdentifier': 'optional',
// Pretend the requested init data types are supported, since we don't
// really know that either:
'initDataTypes': cfg.initDataTypes,
'sessionTypes': ['temporary'],
'label': cfg.label
};
// v0.1b tests for key system availability with an extra argument on
// canPlayType.
let ranAnyTests = false;
if (cfg.audioCapabilities) {
for (let j = 0; j < cfg.audioCapabilities.length; ++j) {
let cap = cfg.audioCapabilities[j];
if (cap.contentType) {
ranAnyTests = true;
// In Chrome <= 40, if you ask about Widevine-encrypted audio support,
// you get a false-negative when you specify codec information.
// Work around this by stripping codec info for audio types.
let contentType = cap.contentType.split(';')[0];
if (tmpVideo.canPlayType(contentType, this.internalKeySystem_)) {
newCfg.audioCapabilities.push(cap);
success = true;
}
}
}
}
if (cfg.videoCapabilities) {
for (let j = 0; j < cfg.videoCapabilities.length; ++j) {
let cap = cfg.videoCapabilities[j];
if (cap.contentType) {
ranAnyTests = true;
if (tmpVideo.canPlayType(cap.contentType, this.internalKeySystem_)) {
newCfg.videoCapabilities.push(cap);
success = true;
}
}
}
}
if (!ranAnyTests) {
// If no specific types were requested, we check all common types to find
// out if the key system is present at all.
success = tmpVideo.canPlayType('video/mp4', this.internalKeySystem_) ||
tmpVideo.canPlayType('video/webm', this.internalKeySystem_);
}
if (cfg.persistentState == 'required') {
if (allowPersistentState) {
newCfg.persistentState = 'required';
newCfg.sessionTypes = ['persistent-license'];
} else {
success = false;
}
}
if (success) {
this.configuration_ = newCfg;
return;
}
} // for each cfg in supportedConfigurations
let message = 'Unsupported keySystem';
if (keySystem == 'org.w3.clearkey' || keySystem == 'com.widevine.alpha') {
message = 'None of the requested configurations were supported.';
}
let unsupportedError = new Error(message);
unsupportedError.name = 'NotSupportedError';
unsupportedError.code = DOMException.NOT_SUPPORTED_ERR;
throw unsupportedError;
};
/** @override */
shaka.polyfill.PatchedMediaKeysWebkit.MediaKeySystemAccess.prototype.
createMediaKeys = function() {
shaka.log.debug(
'PatchedMediaKeysWebkit.MediaKeySystemAccess.createMediaKeys');
// Alias.
const PatchedMediaKeysWebkit = shaka.polyfill.PatchedMediaKeysWebkit;
let mediaKeys = new PatchedMediaKeysWebkit.MediaKeys(this.internalKeySystem_);
return Promise.resolve(/** @type {!MediaKeys} */ (mediaKeys));
};
/** @override */
shaka.polyfill.PatchedMediaKeysWebkit.MediaKeySystemAccess.prototype.
getConfiguration = function() {
shaka.log.debug(
'PatchedMediaKeysWebkit.MediaKeySystemAccess.getConfiguration');
return this.configuration_;
};
/**
* An implementation of MediaKeys.
*
* @constructor
* @struct
* @param {string} keySystem
* @implements {MediaKeys}
*/
shaka.polyfill.PatchedMediaKeysWebkit.MediaKeys = function(keySystem) {
shaka.log.debug('PatchedMediaKeysWebkit.MediaKeys');
/** @private {string} */
this.keySystem_ = keySystem;
/** @private {HTMLMediaElement} */
this.media_ = null;
/** @private {!shaka.util.EventManager} */
this.eventManager_ = new shaka.util.EventManager();
/**
* @private {!Array.<!shaka.polyfill.PatchedMediaKeysWebkit.MediaKeySession>}
*/
this.newSessions_ = [];
/**
* @private {!Object.<string,
* !shaka.polyfill.PatchedMediaKeysWebkit.MediaKeySession>}
*/
this.sessionMap_ = {};
};
/**
* @param {HTMLMediaElement} media
* @protected
*/
shaka.polyfill.PatchedMediaKeysWebkit.MediaKeys.prototype.setMedia =
function(media) {
this.media_ = media;
// Remove any old listeners.
this.eventManager_.removeAll();
let prefix = shaka.polyfill.PatchedMediaKeysWebkit.prefix_;
if (media) {
// Intercept and translate these prefixed EME events.
this.eventManager_.listen(media, prefix + 'needkey',
/** @type {shaka.util.EventManager.ListenerType} */ (
this.onWebkitNeedKey_.bind(this)));
this.eventManager_.listen(media, prefix + 'keymessage',
/** @type {shaka.util.EventManager.ListenerType} */ (
this.onWebkitKeyMessage_.bind(this)));
this.eventManager_.listen(media, prefix + 'keyadded',
/** @type {shaka.util.EventManager.ListenerType} */ (
this.onWebkitKeyAdded_.bind(this)));
this.eventManager_.listen(media, prefix + 'keyerror',
/** @type {shaka.util.EventManager.ListenerType} */ (
this.onWebkitKeyError_.bind(this)));
}
};
/** @override */
shaka.polyfill.PatchedMediaKeysWebkit.MediaKeys.prototype.createSession =
function(opt_sessionType) {
shaka.log.debug('PatchedMediaKeysWebkit.MediaKeys.createSession');
let sessionType = opt_sessionType || 'temporary';
if (sessionType != 'temporary' && sessionType != 'persistent-license') {
throw new TypeError('Session type ' + opt_sessionType +
' is unsupported on this platform.');
}
// Alias.
const PatchedMediaKeysWebkit = shaka.polyfill.PatchedMediaKeysWebkit;
// Unprefixed EME allows for session creation without a video tag or src.
// Prefixed EME requires both a valid HTMLMediaElement and a src.
let media = this.media_ || /** @type {!HTMLMediaElement} */(
document.createElement('video'));
if (!media.src) media.src = 'about:blank';
let session = new PatchedMediaKeysWebkit.MediaKeySession(
media, this.keySystem_, sessionType);
this.newSessions_.push(session);
return session;
};
/** @override */
shaka.polyfill.PatchedMediaKeysWebkit.MediaKeys.prototype.setServerCertificate =
function(serverCertificate) {
shaka.log.debug('PatchedMediaKeysWebkit.MediaKeys.setServerCertificate');
// There is no equivalent in v0.1b, so return failure.
return Promise.resolve(false);
};
/**
* @param {!MediaKeyEvent} event
* @private
*/
shaka.polyfill.PatchedMediaKeysWebkit.MediaKeys.prototype.onWebkitNeedKey_ =
function(event) {
shaka.log.debug('PatchedMediaKeysWebkit.onWebkitNeedKey_', event);
goog.asserts.assert(this.media_, 'media_ not set in onWebkitNeedKey_');
let event2 =
/** @type {!CustomEvent} */ (document.createEvent('CustomEvent'));
event2.initCustomEvent('encrypted', false, false, null);
// not used by v0.1b EME, but given a valid value
event2.initDataType = 'webm';
event2.initData = event.initData;
this.media_.dispatchEvent(event2);
};
/**
* @param {!MediaKeyEvent} event
* @private
*/
shaka.polyfill.PatchedMediaKeysWebkit.MediaKeys.prototype.onWebkitKeyMessage_ =
function(event) {
shaka.log.debug('PatchedMediaKeysWebkit.onWebkitKeyMessage_', event);
let session = this.findSession_(event.sessionId);
if (!session) {
shaka.log.error('Session not found', event.sessionId);
return;
}
let isNew = session.keyStatuses.getStatus() == undefined;
let event2 = new shaka.util.FakeEvent('message', {
messageType: isNew ? 'licenserequest' : 'licenserenewal',
message: event.message
});
session.generated();
session.dispatchEvent(event2);
};
/**
* @param {!MediaKeyEvent} event
* @private
*/
shaka.polyfill.PatchedMediaKeysWebkit.MediaKeys.prototype.onWebkitKeyAdded_ =
function(event) {
shaka.log.debug('PatchedMediaKeysWebkit.onWebkitKeyAdded_', event);
let session = this.findSession_(event.sessionId);
goog.asserts.assert(session, 'unable to find session in onWebkitKeyAdded_');
if (session) {
session.ready();
}
};
/**
* @param {!MediaKeyEvent} event
* @private
*/
shaka.polyfill.PatchedMediaKeysWebkit.MediaKeys.prototype.onWebkitKeyError_ =
function(event) {
shaka.log.debug('PatchedMediaKeysWebkit.onWebkitKeyError_', event);
let session = this.findSession_(event.sessionId);
goog.asserts.assert(session, 'unable to find session in onWebkitKeyError_');
if (session) {
session.handleError(event);
}
};
/**
* @param {string} sessionId
* @return {shaka.polyfill.PatchedMediaKeysWebkit.MediaKeySession}
* @private
*/
shaka.polyfill.PatchedMediaKeysWebkit.MediaKeys.prototype.findSession_ =
function(sessionId) {
let session = this.sessionMap_[sessionId];
if (session) {
shaka.log.debug('PatchedMediaKeysWebkit.MediaKeys.findSession_', session);
return session;
}
session = this.newSessions_.shift();
if (session) {
session.sessionId = sessionId;
this.sessionMap_[sessionId] = session;
shaka.log.debug('PatchedMediaKeysWebkit.MediaKeys.findSession_', session);
return session;
}
return null;
};
/**
* An implementation of MediaKeySession.
*
* @param {!HTMLMediaElement} media
* @param {string} keySystem
* @param {string} sessionType
*
* @constructor
* @struct
* @implements {MediaKeySession}
* @extends {shaka.util.FakeEventTarget}
*/
shaka.polyfill.PatchedMediaKeysWebkit.MediaKeySession =
function(media, keySystem, sessionType) {
shaka.log.debug('PatchedMediaKeysWebkit.MediaKeySession');
shaka.util.FakeEventTarget.call(this);
/** @private {!HTMLMediaElement} */
this.media_ = media;
/** @private {boolean} */
this.initialized_ = false;
/** @private {shaka.util.PublicPromise} */
this.generatePromise_ = null;
/** @private {shaka.util.PublicPromise} */
this.updatePromise_ = null;
/** @private {string} */
this.keySystem_ = keySystem;
/** @private {string} */
this.type_ = sessionType;
/** @type {string} */
this.sessionId = '';
/** @type {number} */
this.expiration = NaN;
/** @type {!shaka.util.PublicPromise} */
this.closed = new shaka.util.PublicPromise();
/** @type {!shaka.polyfill.PatchedMediaKeysWebkit.MediaKeyStatusMap} */
this.keyStatuses =
new shaka.polyfill.PatchedMediaKeysWebkit.MediaKeyStatusMap();
};
goog.inherits(shaka.polyfill.PatchedMediaKeysWebkit.MediaKeySession,
shaka.util.FakeEventTarget);
/**
* Signals that the license request has been generated. This resolves the
* 'generateRequest' promise.
*
* @protected
*/
shaka.polyfill.PatchedMediaKeysWebkit.MediaKeySession.prototype.generated =
function() {
shaka.log.debug('PatchedMediaKeysWebkit.MediaKeySession.generated');
if (this.generatePromise_) {
this.generatePromise_.resolve();
this.generatePromise_ = null;
}
};
/**
* Signals that the session is 'ready', which is the terminology used in older
* versions of EME. The new signal is to resolve the 'update' promise. This
* translates between the two.
*
* @protected
*/
shaka.polyfill.PatchedMediaKeysWebkit.MediaKeySession.prototype.ready =
function() {
shaka.log.debug('PatchedMediaKeysWebkit.MediaKeySession.ready');
this.updateKeyStatus_('usable');
if (this.updatePromise_) {
this.updatePromise_.resolve();
}
this.updatePromise_ = null;
};
/**
* Either rejects a promise, or dispatches an error event, as appropriate.
*
* @param {!MediaKeyEvent} event
*/
shaka.polyfill.PatchedMediaKeysWebkit.MediaKeySession.prototype.handleError =
function(event) {
shaka.log.debug('PatchedMediaKeysWebkit.MediaKeySession.handleError', event);
// This does not match the DOMException we get in current WD EME, but it will
// at least provide some information which can be used to look into the
// problem.
let error = new Error('EME v0.1b key error');
error.errorCode = event.errorCode;
error.errorCode.systemCode = event.systemCode;
// The presence or absence of sessionId indicates whether this corresponds to
// generateRequest() or update().
if (!event.sessionId && this.generatePromise_) {
error.method = 'generateRequest';
if (event.systemCode == 45) {
error.message = 'Unsupported session type.';
}
this.generatePromise_.reject(error);
this.generatePromise_ = null;
} else if (event.sessionId && this.updatePromise_) {
error.method = 'update';
this.updatePromise_.reject(error);
this.updatePromise_ = null;
} else {
// This mapping of key statuses is imperfect at best.
let code = event.errorCode.code;
let systemCode = event.systemCode;
if (code == MediaKeyError['MEDIA_KEYERR_OUTPUT']) {
this.updateKeyStatus_('output-restricted');
} else if (systemCode == 1) {
this.updateKeyStatus_('expired');
} else {
this.updateKeyStatus_('internal-error');
}
}
};
/**
* Logic which is shared between generateRequest() and load(), both of which
* are ultimately implemented with webkitGenerateKeyRequest in prefixed EME.
*
* @param {?BufferSource} initData
* @param {?string} offlineSessionId
* @return {!Promise}
* @private
*/
shaka.polyfill.PatchedMediaKeysWebkit.MediaKeySession.prototype.generate_ =
function(initData, offlineSessionId) {
if (this.initialized_) {
return Promise.reject(new Error('The session is already initialized.'));
}
this.initialized_ = true;
/** @type {!Uint8Array} */
let mangledInitData;
try {
if (this.type_ == 'persistent-license') {
const StringUtils = shaka.util.StringUtils;
if (!offlineSessionId) {
// Persisting the initial license.
// Prefix the init data with a tag to indicate persistence.
let prefix = StringUtils.toUTF8('PERSISTENT|');
let result = new Uint8Array(prefix.byteLength + initData.byteLength);
result.set(new Uint8Array(prefix), 0);
result.set(new Uint8Array(initData), prefix.byteLength);
mangledInitData = result;
} else {
// Loading a stored license.
// Prefix the init data (which is really a session ID) with a tag to
// indicate that we are loading a persisted session.
mangledInitData = new Uint8Array(
StringUtils.toUTF8('LOAD_SESSION|' + offlineSessionId));
}
} else {
// Streaming.
goog.asserts.assert(this.type_ == 'temporary',
'expected temporary session');
goog.asserts.assert(!offlineSessionId,
'unexpected offline session ID');
mangledInitData = new Uint8Array(initData);
}
goog.asserts.assert(mangledInitData,
'init data not set!');
} catch (exception) {
return Promise.reject(exception);
}
goog.asserts.assert(this.generatePromise_ == null,
'generatePromise_ should be null');
this.generatePromise_ = new shaka.util.PublicPromise();
// Because we are hacking media.src in createSession to better emulate
// unprefixed EME's ability to create sessions and license requests without a
// video tag, we can get ourselves into trouble. It seems that sometimes,
// the setting of media.src hasn't been processed by some other thread, and
// GKR can throw an exception. If this occurs, wait 10 ms and try again at
// most once. This situation should only occur when init data is available
// ahead of the 'needkey' event.
let prefixApi = shaka.polyfill.PatchedMediaKeysWebkit.prefixApi_;
let generateKeyRequestName = prefixApi('generateKeyRequest');
try {
this.media_[generateKeyRequestName](this.keySystem_, mangledInitData);
} catch (exception) {
if (exception.name != 'InvalidStateError') {
this.generatePromise_ = null;
return Promise.reject(exception);
}
setTimeout(function() {
try {
this.media_[generateKeyRequestName](this.keySystem_, mangledInitData);
} catch (exception2) {
this.generatePromise_.reject(exception2);
this.generatePromise_ = null;
}
}.bind(this), 10);
}
return this.generatePromise_;
};
/**
* An internal version of update which defers new calls while old ones are in
* progress.
*
* @param {!shaka.util.PublicPromise} promise The promise associated with this
* call.
* @param {?BufferSource} response
* @private
*/
shaka.polyfill.PatchedMediaKeysWebkit.MediaKeySession.prototype.update_ =
function(promise, response) {
if (this.updatePromise_) {
// We already have an update in-progress, so defer this one until after the
// old one is resolved. Execute this whether the original one succeeds or
// fails.
this.updatePromise_.then(
this.update_.bind(this, promise, response)
).catch(
this.update_.bind(this, promise, response)
);
return;
}
this.updatePromise_ = promise;
let key;
let keyId;
if (this.keySystem_ == 'webkit-org.w3.clearkey') {
// The current EME version of clearkey wants a structured JSON response.
// The v0.1b version wants just a raw key. Parse the JSON response and
// extract the key and key ID.
const StringUtils = shaka.util.StringUtils;
const Uint8ArrayUtils = shaka.util.Uint8ArrayUtils;
let licenseString = StringUtils.fromUTF8(response);
let jwkSet = /** @type {JWKSet} */ (JSON.parse(licenseString));
let kty = jwkSet.keys[0].kty;
if (kty != 'oct') {
// Reject the promise.
let error = new Error('Response is not a valid JSON Web Key Set.');
this.updatePromise_.reject(error);
this.updatePromise_ = null;
}
key = Uint8ArrayUtils.fromBase64(jwkSet.keys[0].k);
keyId = Uint8ArrayUtils.fromBase64(jwkSet.keys[0].kid);
} else {
// The key ID is not required.
key = new Uint8Array(response);
keyId = null;
}
let prefixApi = shaka.polyfill.PatchedMediaKeysWebkit.prefixApi_;
let addKeyName = prefixApi('addKey');
try {
this.media_[addKeyName](this.keySystem_, key, keyId, this.sessionId);
} catch (exception) {
// Reject the promise.
this.updatePromise_.reject(exception);
this.updatePromise_ = null;
}
};
/**
* Update key status and dispatch a 'keystatuseschange' event.
*
* @param {string} status
* @private
*/
shaka.polyfill.PatchedMediaKeysWebkit.MediaKeySession.prototype.
updateKeyStatus_ = function(status) {
this.keyStatuses.setStatus(status);
let event = new shaka.util.FakeEvent('keystatuseschange');
this.dispatchEvent(event);
};
/** @override */
shaka.polyfill.PatchedMediaKeysWebkit.MediaKeySession.prototype.
generateRequest = function(initDataType, initData) {
shaka.log.debug('PatchedMediaKeysWebkit.MediaKeySession.generateRequest');
return this.generate_(initData, null);
};
/** @override */
shaka.polyfill.PatchedMediaKeysWebkit.MediaKeySession.prototype.load =
function(sessionId) {
shaka.log.debug('PatchedMediaKeysWebkit.MediaKeySession.load');
if (this.type_ == 'persistent-license') {
return this.generate_(null, sessionId);
} else {
return Promise.reject(new Error('Not a persistent session.'));
}
};
/** @override */
shaka.polyfill.PatchedMediaKeysWebkit.MediaKeySession.prototype.update =
function(response) {
shaka.log.debug('PatchedMediaKeysWebkit.MediaKeySession.update', response);
goog.asserts.assert(this.sessionId, 'update without session ID');
let nextUpdatePromise = new shaka.util.PublicPromise();
this.update_(nextUpdatePromise, response);
return nextUpdatePromise;
};
/** @override */
shaka.polyfill.PatchedMediaKeysWebkit.MediaKeySession.prototype.close =
function() {
shaka.log.debug('PatchedMediaKeysWebkit.MediaKeySession.close');
// This will remove a persistent session, but it's also the only way to
// free CDM resources on v0.1b.
if (this.type_ != 'persistent-license') {
// sessionId may reasonably be null if no key request has been generated
// yet. Unprefixed EME will return a rejected promise in this case.
// We will use the same error message that Chrome 41 uses in its EME
// implementation.
if (!this.sessionId) {
this.closed.reject(new Error('The session is not callable.'));
return this.closed;
}
// This may throw an exception, but we ignore it because we are only using
// it to clean up resources in v0.1b. We still consider the session closed.
// We can't let the exception propagate because MediaKeySession.close()
// should not throw.
let prefixApi = shaka.polyfill.PatchedMediaKeysWebkit.prefixApi_;
let cancelKeyRequestName = prefixApi('cancelKeyRequest');
try {
this.media_[cancelKeyRequestName](this.keySystem_, this.sessionId);
} catch (exception) {}
}
// Resolve the 'closed' promise and return it.
this.closed.resolve();
return this.closed;
};
/** @override */
shaka.polyfill.PatchedMediaKeysWebkit.MediaKeySession.prototype.remove =
function() {
shaka.log.debug('PatchedMediaKeysWebkit.MediaKeySession.remove');
if (this.type_ != 'persistent-license') {
return Promise.reject(new Error('Not a persistent session.'));
}
return this.close();
};
/**
* An implementation of MediaKeyStatusMap.
* This fakes a map with a single key ID.
*
* @constructor
* @struct
* @implements {MediaKeyStatusMap}
*/
shaka.polyfill.PatchedMediaKeysWebkit.MediaKeyStatusMap = function() {
/**
* @type {number}
*/
this.size = 0;
/**
* @private {string|undefined}
*/
this.status_ = undefined;
};
/**
* @const {!ArrayBuffer}
* @private
*/
shaka.polyfill.PatchedMediaKeysWebkit.MediaKeyStatusMap.KEY_ID_;
/**
* An internal method used by the session to set key status.
* @param {string|undefined} status
*/
shaka.polyfill.PatchedMediaKeysWebkit.MediaKeyStatusMap.prototype.setStatus =
function(status) {
this.size = status == undefined ? 0 : 1;
this.status_ = status;
};
/**
* An internal method used by the session to get key status.
* @return {string|undefined}
*/
shaka.polyfill.PatchedMediaKeysWebkit.MediaKeyStatusMap.prototype.getStatus =
function() {
return this.status_;
};
/** @override */
shaka.polyfill.PatchedMediaKeysWebkit.MediaKeyStatusMap.prototype.forEach =
function(fn) {
if (this.status_) {
let fakeKeyId =
shaka.polyfill.PatchedMediaKeysWebkit.MediaKeyStatusMap.KEY_ID_;
fn(this.status_, fakeKeyId);
}
};
/** @override */
shaka.polyfill.PatchedMediaKeysWebkit.MediaKeyStatusMap.prototype.get =
function(keyId) {
if (this.has(keyId)) {
return this.status_;
}
return undefined;
};
/** @override */
shaka.polyfill.PatchedMediaKeysWebkit.MediaKeyStatusMap.prototype.has =
function(keyId) {
let fakeKeyId =
shaka.polyfill.PatchedMediaKeysWebkit.MediaKeyStatusMap.KEY_ID_;
if (this.status_ &&
shaka.util.Uint8ArrayUtils.equal(
new Uint8Array(keyId), new Uint8Array(fakeKeyId))) {
return true;
}
return false;
};
/**
* @suppress {missingReturn}
* @override
*/
shaka.polyfill.PatchedMediaKeysWebkit.MediaKeyStatusMap.prototype.
entries = function() {
goog.asserts.assert(false, 'Not used! Provided only for compiler.');
};
/**
* @suppress {missingReturn}
* @override
*/
shaka.polyfill.PatchedMediaKeysWebkit.MediaKeyStatusMap.prototype.
keys = function() {
goog.asserts.assert(false, 'Not used! Provided only for compiler.');
};
/**
* @suppress {missingReturn}
* @override
*/
shaka.polyfill.PatchedMediaKeysWebkit.MediaKeyStatusMap.prototype.
values = function() {
goog.asserts.assert(false, 'Not used! Provided only for compiler.');
};
shaka.polyfill.register(shaka.polyfill.PatchedMediaKeysWebkit.install);