shaka-player
Version:
DASH/EME video player library
991 lines (851 loc) • 30.6 kB
JavaScript
/*! @license
* Shaka Player
* Copyright 2016 Google LLC
* SPDX-License-Identifier: Apache-2.0
*/
goog.provide('shaka.polyfill.PatchedMediaKeysWebkit');
goog.require('goog.asserts');
goog.require('shaka.drm.DrmUtils');
goog.require('shaka.log');
goog.require('shaka.polyfill');
goog.require('shaka.util.BufferUtils');
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.Timer');
goog.require('shaka.util.Uint8ArrayUtils');
/**
* @summary A polyfill to implement
* {@link https://bit.ly/EmeMar15 EME draft 12 March 2015} on top of
* webkit-prefixed {@link https://bit.ly/Eme01b EME v0.1b}.
* @export
*/
shaka.polyfill.PatchedMediaKeysWebkit = class {
/**
* Installs the polyfill if needed.
* @export
*/
static install() {
// Alias.
const PatchedMediaKeysWebkit = shaka.polyfill.PatchedMediaKeysWebkit;
if (!window.HTMLVideoElement ||
(navigator.requestMediaKeySystemAccess &&
// eslint-disable-next-line no-restricted-syntax
MediaKeySystemAccess.prototype.getConfiguration)) {
return;
}
// eslint-disable-next-line no-restricted-syntax
if (HTMLMediaElement.prototype.webkitGenerateKeyRequest) {
shaka.log.info('Using webkit-prefixed EME v0.1b');
PatchedMediaKeysWebkit.prefix_ = 'webkit';
// eslint-disable-next-line no-restricted-syntax
} else if (HTMLMediaElement.prototype.generateKeyRequest) {
shaka.log.info('Using nonprefixed EME v0.1b');
} else {
return;
}
goog.asserts.assert(
// eslint-disable-next-line no-restricted-syntax
HTMLMediaElement.prototype[
PatchedMediaKeysWebkit.prefixApi_('generateKeyRequest')],
'PatchedMediaKeysWebkit APIs not available!');
// Install patches.
navigator.requestMediaKeySystemAccess =
PatchedMediaKeysWebkit.requestMediaKeySystemAccess;
// Delete mediaKeys to work around strict mode compatibility issues.
// eslint-disable-next-line no-restricted-syntax
delete HTMLMediaElement.prototype['mediaKeys'];
// Work around read-only declaration for mediaKeys by using a string.
// eslint-disable-next-line no-restricted-syntax
HTMLMediaElement.prototype['mediaKeys'] = null;
// eslint-disable-next-line no-restricted-syntax
HTMLMediaElement.prototype.setMediaKeys =
PatchedMediaKeysWebkit.setMediaKeys;
window.MediaKeys = PatchedMediaKeysWebkit.MediaKeys;
window.MediaKeySystemAccess = PatchedMediaKeysWebkit.MediaKeySystemAccess;
window.shakaMediaKeysPolyfill = PatchedMediaKeysWebkit.apiName_;
}
/**
* Prefix the api with the stored prefix.
*
* @param {string} api
* @return {string}
* @private
*/
static prefixApi_(api) {
const 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>}
*/
static requestMediaKeySystemAccess(keySystem, supportedConfigurations) {
shaka.log.debug('PatchedMediaKeysWebkit.requestMediaKeySystemAccess');
goog.asserts.assert(this == navigator,
'bad "this" for requestMediaKeySystemAccess');
// Alias.
const PatchedMediaKeysWebkit = shaka.polyfill.PatchedMediaKeysWebkit;
try {
const 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}
*/
static setMediaKeys(mediaKeys) {
shaka.log.debug('PatchedMediaKeysWebkit.setMediaKeys');
goog.asserts.assert(this instanceof HTMLMediaElement,
'bad "this" for setMediaKeys');
// Alias.
const PatchedMediaKeysWebkit = shaka.polyfill.PatchedMediaKeysWebkit;
const newMediaKeys =
/** @type {shaka.polyfill.PatchedMediaKeysWebkit.MediaKeys} */ (
mediaKeys);
const 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
*/
static getVideoElement_() {
const videos = document.getElementsByTagName('video');
const video = videos.length ? videos[0] : document.createElement('video');
return /** @type {!HTMLVideoElement} */(video);
}
};
/**
* An implementation of MediaKeySystemAccess.
*
* @implements {MediaKeySystemAccess}
*/
shaka.polyfill.PatchedMediaKeysWebkit.MediaKeySystemAccess = class {
/**
* @param {string} keySystem
* @param {!Array<!MediaKeySystemConfiguration>} supportedConfigurations
*/
constructor(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;
const tmpVideo = shaka.polyfill.PatchedMediaKeysWebkit.getVideoElement_();
for (const cfg of supportedConfigurations) {
// 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} */
const 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 (const cap of cfg.audioCapabilities) {
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.
const contentType = cap.contentType.split(';')[0];
if (tmpVideo.canPlayType(contentType, this.internalKeySystem_)) {
newCfg.audioCapabilities.push(cap);
success = true;
}
}
}
}
if (cfg.videoCapabilities) {
for (const cap of cfg.videoCapabilities) {
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.';
}
// According to the spec, this should be a DOMException, but there is not a
// public constructor for that. So we make this look-alike instead.
const unsupportedError = new Error(message);
unsupportedError.name = 'NotSupportedError';
unsupportedError['code'] = DOMException.NOT_SUPPORTED_ERR;
throw unsupportedError;
}
/** @override */
createMediaKeys() {
shaka.log.debug(
'PatchedMediaKeysWebkit.MediaKeySystemAccess.createMediaKeys');
// Alias.
const PatchedMediaKeysWebkit = shaka.polyfill.PatchedMediaKeysWebkit;
const mediaKeys =
new PatchedMediaKeysWebkit.MediaKeys(this.internalKeySystem_);
return Promise.resolve(/** @type {!MediaKeys} */ (mediaKeys));
}
/** @override */
getConfiguration() {
shaka.log.debug(
'PatchedMediaKeysWebkit.MediaKeySystemAccess.getConfiguration');
return this.configuration_;
}
};
/**
* An implementation of MediaKeys.
*
* @implements {MediaKeys}
*/
shaka.polyfill.PatchedMediaKeysWebkit.MediaKeys = class {
/**
* @param {string} keySystem
*/
constructor(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 {!Map<string,
* !shaka.polyfill.PatchedMediaKeysWebkit.MediaKeySession>}
*/
this.sessionMap_ = new Map();
}
/**
* @param {HTMLMediaElement} media
* @protected
*/
setMedia(media) {
this.media_ = media;
// Remove any old listeners.
this.eventManager_.removeAll();
const 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} */ (
(event) => this.onWebkitNeedKey_(event)));
this.eventManager_.listen(media, prefix + 'keymessage',
/** @type {shaka.util.EventManager.ListenerType} */ (
(event) => this.onWebkitKeyMessage_(event)));
this.eventManager_.listen(media, prefix + 'keyadded',
/** @type {shaka.util.EventManager.ListenerType} */ (
(event) => this.onWebkitKeyAdded_(event)));
this.eventManager_.listen(media, prefix + 'keyerror',
/** @type {shaka.util.EventManager.ListenerType} */ (
(event) => this.onWebkitKeyError_(event)));
}
}
/** @override */
createSession(sessionType) {
shaka.log.debug('PatchedMediaKeysWebkit.MediaKeys.createSession');
sessionType = sessionType || 'temporary';
if (sessionType != 'temporary' && sessionType != 'persistent-license') {
throw new TypeError('Session type ' + 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.
const media = this.media_ || /** @type {!HTMLMediaElement} */(
document.createElement('video'));
if (!media.src) {
media.src = 'about:blank';
}
const session = new PatchedMediaKeysWebkit.MediaKeySession(
media, this.keySystem_, sessionType);
this.newSessions_.push(session);
return session;
}
/** @override */
setServerCertificate(serverCertificate) {
shaka.log.debug('PatchedMediaKeysWebkit.MediaKeys.setServerCertificate');
// There is no equivalent in v0.1b, so return failure.
return Promise.resolve(false);
}
/** @override */
getStatusForPolicy(policy) {
return Promise.resolve('usable');
}
/**
* @param {!MediaKeyEvent} event
* @suppress {constantProperty} We reassign what would be const on a real
* MediaEncryptedEvent, but in our look-alike event.
* @private
*/
onWebkitNeedKey_(event) {
shaka.log.debug('PatchedMediaKeysWebkit.onWebkitNeedKey_', event);
goog.asserts.assert(this.media_, 'media_ not set in onWebkitNeedKey_');
const event2 = new CustomEvent('encrypted');
const encryptedEvent =
/** @type {!MediaEncryptedEvent} */(/** @type {?} */(event2));
// initDataType is not used by v0.1b EME, so any valid value is fine here.
encryptedEvent.initDataType = 'cenc';
encryptedEvent.initData = shaka.util.BufferUtils.toArrayBuffer(
event.initData);
this.media_.dispatchEvent(event2);
}
/**
* @param {!MediaKeyEvent} event
* @private
*/
onWebkitKeyMessage_(event) {
shaka.log.debug('PatchedMediaKeysWebkit.onWebkitKeyMessage_', event);
const session = this.findSession_(event.sessionId);
if (!session) {
shaka.log.error('Session not found', event.sessionId);
return;
}
const isNew = session.keyStatuses.getStatus() == undefined;
const data = new Map()
.set('messageType', isNew ? 'licenserequest' : 'licenserenewal')
.set('message', event.message);
const event2 = new shaka.util.FakeEvent('message', data);
session.generated();
session.dispatchEvent(event2);
}
/**
* @param {!MediaKeyEvent} event
* @private
*/
onWebkitKeyAdded_(event) {
shaka.log.debug('PatchedMediaKeysWebkit.onWebkitKeyAdded_', event);
const session = this.findSession_(event.sessionId);
goog.asserts.assert(
session, 'unable to find session in onWebkitKeyAdded_');
if (session) {
session.ready();
}
}
/**
* @param {!MediaKeyEvent} event
* @private
*/
onWebkitKeyError_(event) {
shaka.log.debug('PatchedMediaKeysWebkit.onWebkitKeyError_', event);
const 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
*/
findSession_(sessionId) {
let session = this.sessionMap_.get(sessionId);
if (session) {
shaka.log.debug(
'PatchedMediaKeysWebkit.MediaKeys.findSession_', session);
return session;
}
session = this.newSessions_.shift();
if (session) {
session.sessionId = sessionId;
this.sessionMap_.set(sessionId, session);
shaka.log.debug(
'PatchedMediaKeysWebkit.MediaKeys.findSession_', session);
return session;
}
return null;
}
};
/**
* An implementation of MediaKeySession.
*
* @implements {MediaKeySession}
*/
shaka.polyfill.PatchedMediaKeysWebkit.MediaKeySession =
class extends shaka.util.FakeEventTarget {
/**
* @param {!HTMLMediaElement} media
* @param {string} keySystem
* @param {string} sessionType
*/
constructor(media, keySystem, sessionType) {
shaka.log.debug('PatchedMediaKeysWebkit.MediaKeySession');
super();
/** @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();
}
/**
* Signals that the license request has been generated. This resolves the
* 'generateRequest' promise.
*
* @protected
*/
generated() {
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
*/
ready() {
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
*/
handleError(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.
const error = new Error('EME v0.1b key error');
const errorCode = event.errorCode;
errorCode.systemCode = event.systemCode;
error['errorCode'] = errorCode;
// The presence or absence of sessionId indicates whether this corresponds
// to generateRequest() or update().
if (!event.sessionId && this.generatePromise_) {
if (event.systemCode == 45) {
error.message = 'Unsupported session type.';
}
this.generatePromise_.reject(error);
this.generatePromise_ = null;
} else if (event.sessionId && this.updatePromise_) {
this.updatePromise_.reject(error);
this.updatePromise_ = null;
} else {
// This mapping of key statuses is imperfect at best.
const code = event.errorCode.code;
const 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
*/
generate_(initData, offlineSessionId) {
const PatchedMediaKeysWebkit = shaka.polyfill.PatchedMediaKeysWebkit;
if (this.initialized_) {
const error = new Error('The session is already initialized.');
return Promise.reject(error);
}
this.initialized_ = true;
/** @type {!Uint8Array} */
let mangledInitData;
try {
if (this.type_ == 'persistent-license') {
const StringUtils = shaka.util.StringUtils;
if (!offlineSessionId) {
goog.asserts.assert(initData, 'expecting init data');
// Persisting the initial license.
// Prefix the init data with a tag to indicate persistence.
const prefix = StringUtils.toUTF8('PERSISTENT|');
mangledInitData = shaka.util.Uint8ArrayUtils.concat(prefix, initData);
} 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 = shaka.util.BufferUtils.toUint8(
StringUtils.toUTF8('LOAD_SESSION|' + offlineSessionId));
}
} else {
// Streaming.
goog.asserts.assert(this.type_ == 'temporary',
'expected temporary session');
goog.asserts.assert(!offlineSessionId,
'unexpected offline session ID');
goog.asserts.assert(initData, 'expecting init data');
mangledInitData = shaka.util.BufferUtils.toUint8(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.
const generateKeyRequestName =
PatchedMediaKeysWebkit.prefixApi_('generateKeyRequest');
try {
this.media_[generateKeyRequestName](this.keySystem_, mangledInitData);
} catch (exception) {
if (exception.name != 'InvalidStateError') {
this.generatePromise_ = null;
return Promise.reject(exception);
}
const timer = new shaka.util.Timer(() => {
try {
this.media_[generateKeyRequestName](this.keySystem_, mangledInitData);
} catch (exception2) {
this.generatePromise_.reject(exception2);
this.generatePromise_ = null;
}
});
timer.tickAfter(/* seconds= */ 0.01);
}
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
*/
update_(promise, response) {
const PatchedMediaKeysWebkit = shaka.polyfill.PatchedMediaKeysWebkit;
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_(promise, response))
.catch(() => this.update_(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;
const licenseString = StringUtils.fromUTF8(response);
const jwkSet = /** @type {JWKSet} */ (JSON.parse(licenseString));
const kty = jwkSet.keys[0].kty;
if (kty != 'oct') {
// Reject the promise.
this.updatePromise_.reject(new Error(
'Response is not a valid JSON Web Key Set.'));
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 = shaka.util.BufferUtils.toUint8(response);
keyId = null;
}
const addKeyName = PatchedMediaKeysWebkit.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
*/
updateKeyStatus_(status) {
this.keyStatuses.setStatus(status);
const event = new shaka.util.FakeEvent('keystatuseschange');
this.dispatchEvent(event);
}
/** @override */
generateRequest(initDataType, initData) {
shaka.log.debug('PatchedMediaKeysWebkit.MediaKeySession.generateRequest');
return this.generate_(initData, null);
}
/** @override */
load(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 */
update(response) {
shaka.log.debug('PatchedMediaKeysWebkit.MediaKeySession.update', response);
goog.asserts.assert(this.sessionId, 'update without session ID');
const nextUpdatePromise = new shaka.util.PublicPromise();
this.update_(nextUpdatePromise, response);
return nextUpdatePromise;
}
/** @override */
close() {
const PatchedMediaKeysWebkit = shaka.polyfill.PatchedMediaKeysWebkit;
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.
const cancelKeyRequestName =
PatchedMediaKeysWebkit.prefixApi_('cancelKeyRequest');
try {
this.media_[cancelKeyRequestName](this.keySystem_, this.sessionId);
} catch (exception) {
shaka.log.debug(`${cancelKeyRequestName} exception`, exception);
}
}
// Resolve the 'closed' promise and return it.
this.closed.resolve();
return this.closed;
}
/** @override */
remove() {
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.
*
* @todo Consolidate the MediaKeyStatusMap types in these polyfills.
* @implements {MediaKeyStatusMap}
*/
shaka.polyfill.PatchedMediaKeysWebkit.MediaKeyStatusMap = class {
/** */
constructor() {
/**
* @type {number}
*/
this.size = 0;
/**
* @private {string|undefined}
*/
this.status_ = undefined;
}
/**
* An internal method used by the session to set key status.
* @param {string|undefined} status
*/
setStatus(status) {
this.size = status == undefined ? 0 : 1;
this.status_ = status;
}
/**
* An internal method used by the session to get key status.
* @return {string|undefined}
*/
getStatus() {
return this.status_;
}
/** @override */
forEach(fn) {
if (this.status_) {
fn(this.status_, shaka.drm.DrmUtils.DUMMY_KEY_ID.value());
}
}
/** @override */
get(keyId) {
if (this.has(keyId)) {
return this.status_;
}
return undefined;
}
/** @override */
has(keyId) {
const fakeKeyId = shaka.drm.DrmUtils.DUMMY_KEY_ID.value();
if (this.status_ && shaka.util.BufferUtils.equal(keyId, fakeKeyId)) {
return true;
}
return false;
}
/**
* @suppress {missingReturn}
* @override
*/
entries() {
goog.asserts.assert(false, 'Not used! Provided only for compiler.');
}
/**
* @suppress {missingReturn}
* @override
*/
keys() {
goog.asserts.assert(false, 'Not used! Provided only for compiler.');
}
/**
* @suppress {missingReturn}
* @override
*/
values() {
goog.asserts.assert(false, 'Not used! Provided only for compiler.');
}
};
/**
* Store api prefix.
*
* @private {string}
*/
shaka.polyfill.PatchedMediaKeysWebkit.prefix_ = '';
/**
* API name.
*
* @private {string}
*/
shaka.polyfill.PatchedMediaKeysWebkit.apiName_ = 'webkit';
shaka.polyfill.register(shaka.polyfill.PatchedMediaKeysWebkit.install);