shaka-player
Version:
DASH/EME video player library
1,460 lines (1,267 loc) • 70.4 kB
JavaScript
/*! @license
* Shaka Player
* Copyright 2016 Google LLC
* SPDX-License-Identifier: Apache-2.0
*/
goog.provide('shaka.media.DrmEngine');
goog.require('goog.asserts');
goog.require('shaka.log');
goog.require('shaka.net.NetworkingEngine');
goog.require('shaka.util.BufferUtils');
goog.require('shaka.util.Destroyer');
goog.require('shaka.util.Error');
goog.require('shaka.util.EventManager');
goog.require('shaka.util.FairPlayUtils');
goog.require('shaka.util.FakeEvent');
goog.require('shaka.util.IDestroyable');
goog.require('shaka.util.Iterables');
goog.require('shaka.util.Lazy');
goog.require('shaka.util.ManifestParserUtils');
goog.require('shaka.util.MapUtils');
goog.require('shaka.util.MimeUtils');
goog.require('shaka.util.Platform');
goog.require('shaka.util.PublicPromise');
goog.require('shaka.util.StringUtils');
goog.require('shaka.util.Timer');
goog.require('shaka.util.Uint8ArrayUtils');
/** @implements {shaka.util.IDestroyable} */
shaka.media.DrmEngine = class {
/**
* @param {shaka.media.DrmEngine.PlayerInterface} playerInterface
* @param {number=} updateExpirationTime
*/
constructor(playerInterface, updateExpirationTime = 1) {
/** @private {?shaka.media.DrmEngine.PlayerInterface} */
this.playerInterface_ = playerInterface;
/** @private {!Set.<string>} */
this.supportedTypes_ = new Set();
/** @private {MediaKeys} */
this.mediaKeys_ = null;
/** @private {HTMLMediaElement} */
this.video_ = null;
/** @private {boolean} */
this.initialized_ = false;
/** @private {number} */
this.licenseTimeSeconds_ = 0;
/** @private {?shaka.extern.DrmInfo} */
this.currentDrmInfo_ = null;
/** @private {shaka.util.EventManager} */
this.eventManager_ = new shaka.util.EventManager();
/**
* @private {!Map.<MediaKeySession,
* shaka.media.DrmEngine.SessionMetaData>}
*/
this.activeSessions_ = new Map();
/** @private {!Array.<string>} */
this.offlineSessionIds_ = [];
/** @private {!shaka.util.PublicPromise} */
this.allSessionsLoaded_ = new shaka.util.PublicPromise();
/** @private {?shaka.extern.DrmConfiguration} */
this.config_ = null;
/** @private {function(!shaka.util.Error)} */
this.onError_ = (err) => {
this.allSessionsLoaded_.reject(err);
playerInterface.onError(err);
};
/**
* The most recent key status information we have.
* We may not have announced this information to the outside world yet,
* which we delay to batch up changes and avoid spurious "missing key"
* errors.
* @private {!Map.<string, string>}
*/
this.keyStatusByKeyId_ = new Map();
/**
* The key statuses most recently announced to other classes.
* We may have more up-to-date information being collected in
* this.keyStatusByKeyId_, which has not been batched up and released yet.
* @private {!Map.<string, string>}
*/
this.announcedKeyStatusByKeyId_ = new Map();
/** @private {shaka.util.Timer} */
this.keyStatusTimer_ =
new shaka.util.Timer(() => this.processKeyStatusChanges_());
/** @private {boolean} */
this.usePersistentLicenses_ = false;
/** @private {!Array.<!MediaKeyMessageEvent>} */
this.mediaKeyMessageEvents_ = [];
/** @private {boolean} */
this.initialRequestsSent_ = false;
/** @private {?shaka.util.Timer} */
this.expirationTimer_ = new shaka.util.Timer(() => {
this.pollExpiration_();
}).tickEvery(/* seconds= */ updateExpirationTime);
// Add a catch to the Promise to avoid console logs about uncaught errors.
const noop = () => {};
this.allSessionsLoaded_.catch(noop);
/** @const {!shaka.util.Destroyer} */
this.destroyer_ = new shaka.util.Destroyer(() => this.destroyNow_());
}
/** @override */
destroy() {
return this.destroyer_.destroy();
}
/**
* Destroy this instance of DrmEngine. This assumes that all other checks
* about "if it should" have passed.
*
* @private
*/
async destroyNow_() {
// |eventManager_| should only be |null| after we call |destroy|. Destroy it
// first so that we will stop responding to events.
this.eventManager_.release();
this.eventManager_ = null;
// Since we are destroying ourselves, we don't want to react to the "all
// sessions loaded" event.
this.allSessionsLoaded_.reject();
// Stop all timers. This will ensure that they do not start any new work
// while we are destroying ourselves.
this.expirationTimer_.stop();
this.expirationTimer_ = null;
this.keyStatusTimer_.stop();
this.keyStatusTimer_ = null;
// Close all open sessions.
await this.closeOpenSessions_();
// |video_| will be |null| if we never attached to a video element.
if (this.video_) {
goog.asserts.assert(!this.video_.src, 'video src must be removed first!');
try {
await this.video_.setMediaKeys(null);
} catch (error) {
// Ignore any failures while removing media keys from the video element.
}
this.video_ = null;
}
// Break references to everything else we hold internally.
this.currentDrmInfo_ = null;
this.supportedTypes_.clear();
this.mediaKeys_ = null;
this.offlineSessionIds_ = [];
this.config_ = null;
this.onError_ = () => {};
this.playerInterface_ = null;
}
/**
* Called by the Player to provide an updated configuration any time it
* changes.
* Must be called at least once before init().
*
* @param {shaka.extern.DrmConfiguration} config
*/
configure(config) {
this.config_ = config;
}
/**
* Initialize the drm engine for storing and deleting stored content.
*
* @param {!Array.<shaka.extern.Variant>} variants
* The variants that are going to be stored.
* @param {boolean} usePersistentLicenses
* Whether or not persistent licenses should be requested and stored for
* |manifest|.
* @return {!Promise}
*/
initForStorage(variants, usePersistentLicenses) {
// There are two cases for this call:
// 1. We are about to store a manifest - in that case, there are no offline
// sessions and therefore no offline session ids.
// 2. We are about to remove the offline sessions for this manifest - in
// that case, we don't need to know about them right now either as
// we will be told which ones to remove later.
this.offlineSessionIds_ = [];
// What we really need to know is whether or not they are expecting to use
// persistent licenses.
this.usePersistentLicenses_ = usePersistentLicenses;
return this.init_(variants);
}
/**
* Initialize the drm engine for playback operations.
*
* @param {!Array.<shaka.extern.Variant>} variants
* The variants that we want to support playing.
* @param {!Array.<string>} offlineSessionIds
* @return {!Promise}
*/
initForPlayback(variants, offlineSessionIds) {
this.offlineSessionIds_ = offlineSessionIds;
this.usePersistentLicenses_ = offlineSessionIds.length > 0;
return this.init_(variants);
}
/**
* Initializes the drm engine for removing persistent sessions. Only the
* removeSession(s) methods will work correctly, creating new sessions may not
* work as desired.
*
* @param {string} keySystem
* @param {string} licenseServerUri
* @param {Uint8Array} serverCertificate
* @param {!Array.<MediaKeySystemMediaCapability>} audioCapabilities
* @param {!Array.<MediaKeySystemMediaCapability>} videoCapabilities
* @return {!Promise}
*/
initForRemoval(keySystem, licenseServerUri, serverCertificate,
audioCapabilities, videoCapabilities) {
/** @type {!Map.<string, MediaKeySystemConfiguration>} */
const configsByKeySystem = new Map();
/** @type {MediaKeySystemConfiguration} */
const config = {
audioCapabilities: audioCapabilities,
videoCapabilities: videoCapabilities,
distinctiveIdentifier: 'optional',
persistentState: 'required',
sessionTypes: ['persistent-license'],
label: keySystem, // Tracked by us, ignored by EME.
};
// TODO: refactor, don't stick drmInfos onto MediaKeySystemConfiguration
config['drmInfos'] = [{ // Non-standard attribute, ignored by EME.
keySystem: keySystem,
licenseServerUri: licenseServerUri,
distinctiveIdentifierRequired: false,
persistentStateRequired: true,
audioRobustness: '', // Not required by queryMediaKeys_
videoRobustness: '', // Same
serverCertificate: serverCertificate,
initData: null,
keyIds: null,
}];
configsByKeySystem.set(keySystem, config);
return this.queryMediaKeys_(configsByKeySystem);
}
/**
* Negotiate for a key system and set up MediaKeys.
* This will assume that both |usePersistentLicences_| and
* |offlineSessionIds_| have been properly set.
*
* @param {!Array.<shaka.extern.Variant>} variants
* The variants that we expect to operate with during the drm engine's
* lifespan of the drm engine.
* @return {!Promise} Resolved if/when a key system has been chosen.
* @private
*/
init_(variants) {
goog.asserts.assert(this.config_,
'DrmEngine configure() must be called before init()!');
// ClearKey config overrides the manifest DrmInfo if present. The variants
// are modified so that filtering in Player still works.
// This comes before hadDrmInfo because it influences the value of that.
/** @type {?shaka.extern.DrmInfo} */
const clearKeyDrmInfo = this.configureClearKey_();
if (clearKeyDrmInfo) {
for (const variant of variants) {
if (variant.video && variant.video.encrypted) {
variant.video.drmInfos = [clearKeyDrmInfo];
}
if (variant.audio && variant.audio.encrypted) {
variant.audio.drmInfos = [clearKeyDrmInfo];
}
}
}
const hadDrmInfo = variants.some((variant) => {
if (variant.video && variant.video.drmInfos.length) {
return true;
}
if (variant.audio && variant.audio.drmInfos.length) {
return true;
}
return false;
});
// When preparing to play live streams, it is possible that we won't know
// about some upcoming encrypted content. If we initialize the drm engine
// with no key systems, we won't be able to play when the encrypted content
// comes.
//
// To avoid this, we will set the drm engine up to work with as many key
// systems as possible so that we will be ready.
if (!hadDrmInfo) {
const servers = shaka.util.MapUtils.asMap(this.config_.servers);
shaka.media.DrmEngine.replaceDrmInfo_(variants, servers);
}
// Make sure all the drm infos are valid and filled in correctly.
for (const variant of variants) {
const videoDrmInfos = variant.video ? variant.video.drmInfos : [];
const audioDrmInfos = variant.audio ? variant.audio.drmInfos : [];
const drmInfos = videoDrmInfos.concat(audioDrmInfos);
for (const info of drmInfos) {
shaka.media.DrmEngine.fillInDrmInfoDefaults_(
info,
shaka.util.MapUtils.asMap(this.config_.servers),
shaka.util.MapUtils.asMap(this.config_.advanced || {}));
}
}
/** @type {!Map.<string, MediaKeySystemConfiguration>} */
const configsByKeySystem =
this.prepareMediaKeyConfigsForVariants_(variants);
// TODO(vaage): Find an explanation for the difference between this
// "unencrypted" form and the "no drm info unencrypted form" and express
// that difference here.
if (!configsByKeySystem.size) {
// Unencrypted.
this.initialized_ = true;
return Promise.resolve();
}
const p = this.queryMediaKeys_(configsByKeySystem);
// TODO(vaage): Look into the assertion below. If we do not have any drm
// info, we create drm info so that content can play if it has drm info
// later.
// However it is okay if we fail to initialize? If we fail to initialize,
// it means we won't be able to play the later-encrypted content, which is
// not okay.
// If the content did not originally have any drm info, then it doesn't
// matter if we fail to initialize the drm engine, because we won't need it
// anyway.
return hadDrmInfo ? p : p.catch(() => {});
}
/**
* Attach MediaKeys to the video element and start processing events.
* @param {HTMLMediaElement} video
* @return {!Promise}
*/
async attach(video) {
if (!this.mediaKeys_) {
// Unencrypted, or so we think. We listen for encrypted events in order
// to warn when the stream is encrypted, even though the manifest does
// not know it.
// Don't complain about this twice, so just listenOnce().
// FIXME: This is ineffective when a prefixed event is translated by our
// polyfills, since those events are only caught and translated by a
// MediaKeys instance. With clear content and no polyfilled MediaKeys
// instance attached, you'll never see the 'encrypted' event on those
// platforms (IE 11 & Safari).
this.eventManager_.listenOnce(video, 'encrypted', (event) => {
this.onError_(new shaka.util.Error(
shaka.util.Error.Severity.CRITICAL,
shaka.util.Error.Category.DRM,
shaka.util.Error.Code.ENCRYPTED_CONTENT_WITHOUT_DRM_INFO));
});
return;
}
this.video_ = video;
this.eventManager_.listenOnce(this.video_, 'play', () => this.onPlay_());
if ('webkitCurrentPlaybackTargetIsWireless' in this.video_) {
this.eventManager_.listen(this.video_,
'webkitcurrentplaybacktargetiswirelesschanged',
() => this.closeOpenSessions_());
}
let setMediaKeys = this.video_.setMediaKeys(this.mediaKeys_);
setMediaKeys = setMediaKeys.catch((exception) => {
goog.asserts.assert(exception instanceof Error, 'Wrong error type!');
return Promise.reject(new shaka.util.Error(
shaka.util.Error.Severity.CRITICAL,
shaka.util.Error.Category.DRM,
shaka.util.Error.Code.FAILED_TO_ATTACH_TO_VIDEO,
exception.message));
});
const setServerCertificate = this.setServerCertificate();
await Promise.all([setMediaKeys, setServerCertificate]);
this.destroyer_.ensureNotDestroyed();
this.createOrLoad();
if (!this.currentDrmInfo_.initData.length &&
!this.offlineSessionIds_.length) {
// Explicit init data for any one stream or an offline session is
// sufficient to suppress 'encrypted' events for all streams.
const cb = (e) => this.newInitData(
e.initDataType, shaka.util.BufferUtils.toUint8(e.initData));
this.eventManager_.listen(this.video_, 'encrypted', cb);
}
}
/**
* Sets the server certificate based on the current DrmInfo.
*
* @return {!Promise}
*/
async setServerCertificate() {
goog.asserts.assert(this.initialized_,
'Must call init() before setServerCertificate');
if (this.mediaKeys_ &&
this.currentDrmInfo_ &&
this.currentDrmInfo_.serverCertificate &&
this.currentDrmInfo_.serverCertificate.length) {
try {
const supported = await this.mediaKeys_.setServerCertificate(
this.currentDrmInfo_.serverCertificate);
if (!supported) {
shaka.log.warning('Server certificates are not supported by the ' +
'key system. The server certificate has been ' +
'ignored.');
}
} catch (exception) {
throw new shaka.util.Error(
shaka.util.Error.Severity.CRITICAL,
shaka.util.Error.Category.DRM,
shaka.util.Error.Code.INVALID_SERVER_CERTIFICATE,
exception.message);
}
}
}
/**
* Remove an offline session and delete it's data. This can only be called
* after a successful call to |init|. This will wait until the
* 'license-release' message is handled. The returned Promise will be rejected
* if there is an error releasing the license.
*
* @param {string} sessionId
* @return {!Promise}
*/
async removeSession(sessionId) {
goog.asserts.assert(this.mediaKeys_,
'Must call init() before removeSession');
const session = await this.loadOfflineSession_(sessionId);
// This will be null on error, such as session not found.
if (!session) {
shaka.log.v2('Ignoring attempt to remove missing session', sessionId);
return;
}
// TODO: Consider adding a timeout to get the 'message' event.
// Note that the 'message' event will get raised after the remove()
// promise resolves.
const tasks = [];
const found = this.activeSessions_.get(session);
if (found) {
// This will force us to wait until the 'license-release' message has been
// handled.
found.updatePromise = new shaka.util.PublicPromise();
tasks.push(found.updatePromise);
}
shaka.log.v2('Attempting to remove session', sessionId);
tasks.push(session.remove());
await Promise.all(tasks);
}
/**
* Creates the sessions for the init data and waits for them to become ready.
*
* @return {!Promise}
*/
createOrLoad() {
// Create temp sessions.
const initDatas =
(this.currentDrmInfo_ ? this.currentDrmInfo_.initData : []) || [];
for (const initDataOverride of initDatas) {
this.newInitData(
initDataOverride.initDataType, initDataOverride.initData);
}
// Load each session.
for (const sessionId of this.offlineSessionIds_) {
this.loadOfflineSession_(sessionId);
}
// If we have no sessions, we need to resolve the promise right now or else
// it will never get resolved.
if (!initDatas.length && !this.offlineSessionIds_.length) {
this.allSessionsLoaded_.resolve();
}
return this.allSessionsLoaded_;
}
/**
* Called when new initialization data is encountered. If this data hasn't
* been seen yet, this will create a new session for it.
*
* @param {string} initDataType
* @param {!Uint8Array} initData
*/
newInitData(initDataType, initData) {
// Suppress duplicate init data.
// Note that some init data are extremely large and can't portably be used
// as keys in a dictionary.
const metadatas = this.activeSessions_.values();
for (const metadata of metadatas) {
// Tizen 2015 and 2016 models will send multiple webkitneedkey events
// with the same init data. If the duplicates are supressed, playback
// will stall without errors.
if (shaka.util.BufferUtils.equal(initData, metadata.initData) &&
!shaka.util.Platform.isTizen2()) {
shaka.log.debug('Ignoring duplicate init data.');
return;
}
}
this.createTemporarySession_(initDataType, initData);
}
/** @return {boolean} */
initialized() {
return this.initialized_;
}
/**
* @param {?shaka.extern.DrmInfo} drmInfo
* @return {string} */
static keySystem(drmInfo) {
return drmInfo ? drmInfo.keySystem : '';
}
/**
* Check if DrmEngine (as initialized) will likely be able to support the
* given content type.
*
* @param {string} contentType
* @return {boolean}
*/
willSupport(contentType) {
// Edge 14 does not report correct capabilities. It will only report the
// first MIME type even if the others are supported. To work around this,
// we say that Edge supports everything.
//
// See: https://bit.ly/2IcEgv0 and Issue #1495
if (shaka.util.Platform.isEdge()) {
return true;
}
return this.supportedTypes_.has(contentType);
}
/**
* Returns the ID of the sessions currently active.
*
* @return {!Array.<string>}
*/
getSessionIds() {
const sessions = this.activeSessions_.keys();
const ids = shaka.util.Iterables.map(sessions, (s) => s.sessionId);
// TODO: Make |getSessionIds| return |Iterable| instead of |Array|.
return Array.from(ids);
}
/**
* Returns the next expiration time, or Infinity.
* @return {number}
*/
getExpiration() {
// This will equal Infinity if there are no entries.
let min = Infinity;
const sessions = this.activeSessions_.keys();
for (const session of sessions) {
if (!isNaN(session.expiration)) {
min = Math.min(min, session.expiration);
}
}
return min;
}
/**
* Returns the time spent on license requests during this session, or NaN.
*
* @return {number}
*/
getLicenseTime() {
if (this.licenseTimeSeconds_) {
return this.licenseTimeSeconds_;
}
return NaN;
}
/**
* Returns the DrmInfo that was used to initialize the current key system.
*
* @return {?shaka.extern.DrmInfo}
*/
getDrmInfo() {
return this.currentDrmInfo_;
}
/**
* Returns the current key statuses.
*
* @return {!Object.<string, string>}
*/
getKeyStatuses() {
return shaka.util.MapUtils.asObject(this.announcedKeyStatusByKeyId_);
}
/**
* @param {!Array.<shaka.extern.Variant>} variants
* @see https://bit.ly/EmeConfig for MediaKeySystemConfiguration spec
* @return {!Map.<string, MediaKeySystemConfiguration>}
* @private
*/
prepareMediaKeyConfigsForVariants_(variants) {
const ContentType = shaka.util.ManifestParserUtils.ContentType;
// Get all the drm info so that we can avoid using nested loops when we just
// need the drm info.
const allDrmInfo = new Set();
for (const variant of variants) {
const videoDrmInfos = variant.video ? variant.video.drmInfos : [];
const audioDrmInfos = variant.audio ? variant.audio.drmInfos : [];
const drmInfos = videoDrmInfos.concat(audioDrmInfos);
for (const info of drmInfos) {
allDrmInfo.add(info);
}
}
// Make sure all the drm infos are valid and filled in correctly.
for (const info of allDrmInfo) {
shaka.media.DrmEngine.fillInDrmInfoDefaults_(
info,
shaka.util.MapUtils.asMap(this.config_.servers),
shaka.util.MapUtils.asMap(this.config_.advanced || {}));
}
const persistentState =
this.usePersistentLicenses_ ? 'required' : 'optional';
const sessionTypes =
this.usePersistentLicenses_ ? ['persistent-license'] : ['temporary'];
const configs = new Map();
// Create a config entry for each key system.
for (const info of allDrmInfo) {
const config = {
// Ignore initDataTypes.
audioCapabilities: [],
videoCapabilities: [],
distinctiveIdentifier: 'optional',
persistentState: persistentState,
sessionTypes: sessionTypes,
label: info.keySystem, // Tracked by us, ignored by EME.
};
// TODO: refactor, don't stick drmInfos onto MediaKeySystemConfiguration
config['drmInfos'] = []; // Non-standard attribute, ignored by EME.
// Multiple calls to |set| will still respect the insertion order of the
// first call to |set| for a given key.
configs.set(info.keySystem, config);
}
// Connect each key system with each stream using it.
for (const variant of variants) {
/** @type {?shaka.extern.Stream} */
const audio = variant.audio;
/** @type {?shaka.extern.Stream} */
const video = variant.video;
// Add the last bit of information to each config;
for (const stream of [audio, video]) {
if (!stream) {
continue;
}
const mimeType = shaka.util.MimeUtils.getFullType(
stream.mimeType, stream.codecs);
for (const info of stream.drmInfos) {
const config = configs.get(info.keySystem);
goog.asserts.assert(
config,
'Any missing configs should have be filled in before.');
// TODO: refactor, don't stick drmInfos onto
// MediaKeySystemConfiguration
config['drmInfos'].push(info);
if (info.distinctiveIdentifierRequired) {
config.distinctiveIdentifier = 'required';
}
if (info.persistentStateRequired) {
config.persistentState = 'required';
}
const robustness = (stream.type == ContentType.AUDIO) ?
info.audioRobustness : info.videoRobustness;
/** @type {MediaKeySystemMediaCapability} */
const capability = {
robustness: robustness || '',
contentType: mimeType,
};
if (stream.type == ContentType.AUDIO) {
config.audioCapabilities.push(capability);
} else {
config.videoCapabilities.push(capability);
}
} // for (const info of stream.drmInfos)
} // for (const stream of [audio, video])
} // for (const variant of variants)
return configs;
}
/**
* @param {!Map.<string, MediaKeySystemConfiguration>} configsByKeySystem
* A dictionary of configs, indexed by key system, with an iteration order
* (insertion order) that reflects the preference for the application.
* @return {!Promise} Resolved if/when a key system has been chosen.
* @private
*/
async queryMediaKeys_(configsByKeySystem) {
if (configsByKeySystem.size == 1 && configsByKeySystem.has('')) {
throw new shaka.util.Error(
shaka.util.Error.Severity.CRITICAL,
shaka.util.Error.Category.DRM,
shaka.util.Error.Code.NO_RECOGNIZED_KEY_SYSTEMS);
}
// If there are no tracks of a type, these should be not present.
// Otherwise the query will fail.
for (const config of configsByKeySystem.values()) {
if (config.audioCapabilities.length == 0) {
delete config.audioCapabilities;
}
if (config.videoCapabilities.length == 0) {
delete config.videoCapabilities;
}
}
let mediaKeySystemAccess;
// Try key systems with configured license servers first. We only have to
// try key systems without configured license servers for diagnostic
// reasons, so that we can differentiate between "none of these key systems
// are available" and "some are available, but you did not configure them
// properly." The former takes precedence.
for (const shouldHaveLicenseServer of [true, false]) {
for (const keySystem of configsByKeySystem.keys()) {
const config = configsByKeySystem.get(keySystem);
// TODO: refactor, don't stick drmInfos onto MediaKeySystemConfiguration
const hasLicenseServer = config['drmInfos'].some((info) => {
return !!info.licenseServerUri;
});
if (hasLicenseServer != shouldHaveLicenseServer) {
continue;
}
try {
mediaKeySystemAccess = // eslint-disable-next-line no-await-in-loop
await navigator.requestMediaKeySystemAccess(keySystem, [config]);
break;
} catch (error) {} // Suppress errors.
this.destroyer_.ensureNotDestroyed();
}
if (mediaKeySystemAccess) {
break;
}
}
if (!mediaKeySystemAccess) {
throw new shaka.util.Error(
shaka.util.Error.Severity.CRITICAL,
shaka.util.Error.Category.DRM,
shaka.util.Error.Code.REQUESTED_KEY_SYSTEM_CONFIG_UNAVAILABLE);
}
this.destroyer_.ensureNotDestroyed();
try {
// Get the set of supported content types from the audio and video
// capabilities. Avoid duplicates so that it is easier to read what is
// supported.
this.supportedTypes_.clear();
// Store the capabilities of the key system.
const realConfig = mediaKeySystemAccess.getConfiguration();
const audioCaps = realConfig.audioCapabilities || [];
const videoCaps = realConfig.videoCapabilities || [];
for (const cap of audioCaps) {
this.supportedTypes_.add(cap.contentType);
}
for (const cap of videoCaps) {
this.supportedTypes_.add(cap.contentType);
}
goog.asserts.assert(this.supportedTypes_.size,
'We should get at least one supported MIME type');
this.currentDrmInfo_ = shaka.media.DrmEngine.createDrmInfoFor_(
mediaKeySystemAccess.keySystem,
configsByKeySystem.get(mediaKeySystemAccess.keySystem));
if (!this.currentDrmInfo_.licenseServerUri) {
throw new shaka.util.Error(
shaka.util.Error.Severity.CRITICAL,
shaka.util.Error.Category.DRM,
shaka.util.Error.Code.NO_LICENSE_SERVER_GIVEN,
this.currentDrmInfo_.keySystem);
}
const mediaKeys = await mediaKeySystemAccess.createMediaKeys();
this.destroyer_.ensureNotDestroyed();
shaka.log.info('Created MediaKeys object for key system',
this.currentDrmInfo_.keySystem);
this.mediaKeys_ = mediaKeys;
this.initialized_ = true;
} catch (exception) {
this.destroyer_.ensureNotDestroyed(exception);
// Don't rewrap a shaka.util.Error from earlier in the chain:
this.currentDrmInfo_ = null;
this.supportedTypes_.clear();
if (exception instanceof shaka.util.Error) {
throw exception;
}
// We failed to create MediaKeys. This generally shouldn't happen.
throw new shaka.util.Error(
shaka.util.Error.Severity.CRITICAL,
shaka.util.Error.Category.DRM,
shaka.util.Error.Code.FAILED_TO_CREATE_CDM,
exception.message);
}
}
/**
* Create a DrmInfo using configured clear keys.
* The server URI will be a data URI which decodes to a clearkey license.
* @return {?shaka.extern.DrmInfo} or null if clear keys are not configured.
* @private
* @see https://bit.ly/2K8gOnv for the spec on the clearkey license format.
*/
configureClearKey_() {
const clearKeys = shaka.util.MapUtils.asMap(this.config_.clearKeys);
if (clearKeys.size == 0) {
return null;
}
const StringUtils = shaka.util.StringUtils;
const Uint8ArrayUtils = shaka.util.Uint8ArrayUtils;
const keys = [];
const keyIds = [];
clearKeys.forEach((keyHex, keyIdHex) => {
const keyId = Uint8ArrayUtils.fromHex(keyIdHex);
const key = Uint8ArrayUtils.fromHex(keyHex);
const keyObj = {
kty: 'oct',
kid: Uint8ArrayUtils.toBase64(keyId, false),
k: Uint8ArrayUtils.toBase64(key, false),
};
keys.push(keyObj);
keyIds.push(keyObj.kid);
});
const jwkSet = {keys: keys};
const license = JSON.stringify(jwkSet);
// Use the keyids init data since is suggested by EME.
// Suggestion: https://bit.ly/2JYcNTu
// Format: https://www.w3.org/TR/eme-initdata-keyids/
const initDataStr = JSON.stringify({'kids': keyIds});
const initData =
shaka.util.BufferUtils.toUint8(StringUtils.toUTF8(initDataStr));
const initDatas = [{initData: initData, initDataType: 'keyids'}];
return {
keySystem: 'org.w3.clearkey',
licenseServerUri: 'data:application/json;base64,' + window.btoa(license),
distinctiveIdentifierRequired: false,
persistentStateRequired: false,
audioRobustness: '',
videoRobustness: '',
serverCertificate: null,
initData: initDatas,
keyIds: new Set(keyIds),
};
}
/**
* @param {string} sessionId
* @return {!Promise.<MediaKeySession>}
* @private
*/
async loadOfflineSession_(sessionId) {
let session;
try {
shaka.log.v1('Attempting to load an offline session', sessionId);
session = this.mediaKeys_.createSession('persistent-license');
} catch (exception) {
const error = new shaka.util.Error(
shaka.util.Error.Severity.CRITICAL,
shaka.util.Error.Category.DRM,
shaka.util.Error.Code.FAILED_TO_CREATE_SESSION,
exception.message);
this.onError_(error);
return Promise.reject(error);
}
this.eventManager_.listen(session, 'message',
/** @type {shaka.util.EventManager.ListenerType} */(
(event) => this.onSessionMessage_(event)));
this.eventManager_.listen(session, 'keystatuseschange',
(event) => this.onKeyStatusesChange_(event));
const metadata = {
initData: null,
loaded: false,
oldExpiration: Infinity,
updatePromise: null,
};
this.activeSessions_.set(session, metadata);
try {
const present = await session.load(sessionId);
this.destroyer_.ensureNotDestroyed();
shaka.log.v2('Loaded offline session', sessionId, present);
if (!present) {
this.activeSessions_.delete(session);
this.onError_(new shaka.util.Error(
shaka.util.Error.Severity.CRITICAL,
shaka.util.Error.Category.DRM,
shaka.util.Error.Code.OFFLINE_SESSION_REMOVED));
return Promise.resolve();
}
// TODO: We should get a key status change event. Remove once Chrome CDM
// is fixed.
metadata.loaded = true;
if (this.areAllSessionsLoaded_()) {
this.allSessionsLoaded_.resolve();
}
return session;
} catch (error) {
this.destroyer_.ensureNotDestroyed(error);
this.activeSessions_.delete(session);
this.onError_(new shaka.util.Error(
shaka.util.Error.Severity.CRITICAL,
shaka.util.Error.Category.DRM,
shaka.util.Error.Code.FAILED_TO_CREATE_SESSION,
error.message));
}
return Promise.resolve();
}
/**
* @param {string} initDataType
* @param {!Uint8Array} initData
* @private
*/
createTemporarySession_(initDataType, initData) {
let session;
try {
if (this.usePersistentLicenses_) {
shaka.log.v1('Creating new persistent session');
session = this.mediaKeys_.createSession('persistent-license');
} else {
shaka.log.v1('Creating new temporary session');
session = this.mediaKeys_.createSession();
}
} catch (exception) {
this.onError_(new shaka.util.Error(
shaka.util.Error.Severity.CRITICAL,
shaka.util.Error.Category.DRM,
shaka.util.Error.Code.FAILED_TO_CREATE_SESSION,
exception.message));
return;
}
this.eventManager_.listen(session, 'message',
/** @type {shaka.util.EventManager.ListenerType} */(
(event) => this.onSessionMessage_(event)));
this.eventManager_.listen(session, 'keystatuseschange',
(event) => this.onKeyStatusesChange_(event));
const metadata = {
initData: initData,
loaded: false,
oldExpiration: Infinity,
updatePromise: null,
};
this.activeSessions_.set(session, metadata);
try {
initData = this.config_.initDataTransform(
initData, initDataType, this.currentDrmInfo_);
} catch (error) {
let shakaError = error;
if (!(error instanceof shaka.util.Error)) {
shakaError = new shaka.util.Error(
shaka.util.Error.Severity.CRITICAL,
shaka.util.Error.Category.DRM,
shaka.util.Error.Code.INIT_DATA_TRANSFORM_ERROR,
error);
}
this.onError_(shakaError);
return;
}
if (this.config_.logLicenseExchange) {
const str = shaka.util.Uint8ArrayUtils.toBase64(initData);
shaka.log.info('EME init data: type=', initDataType, 'data=', str);
}
session.generateRequest(initDataType, initData).catch((error) => {
if (this.destroyer_.destroyed()) {
return;
}
goog.asserts.assert(error instanceof Error, 'Wrong error type!');
this.activeSessions_.delete(session);
// This may be supplied by some polyfills.
/** @type {MediaKeyError} */
const errorCode = error['errorCode'];
let extended;
if (errorCode && errorCode.systemCode) {
extended = errorCode.systemCode;
if (extended < 0) {
extended += Math.pow(2, 32);
}
extended = '0x' + extended.toString(16);
}
this.onError_(new shaka.util.Error(
shaka.util.Error.Severity.CRITICAL,
shaka.util.Error.Category.DRM,
shaka.util.Error.Code.FAILED_TO_GENERATE_LICENSE_REQUEST,
error.message, error, extended));
});
}
/**
* @param {!Uint8Array} initData
* @param {string} initDataType
* @param {?shaka.extern.DrmInfo} drmInfo
* @return {!Uint8Array}
*/
static defaultInitDataTransform(initData, initDataType, drmInfo) {
if (initDataType == 'skd') {
const cert = drmInfo.serverCertificate;
const contentId =
shaka.util.FairPlayUtils.defaultGetContentId(initData);
initData = shaka.util.FairPlayUtils.initDataTransform(
initData, contentId, cert);
}
return initData;
}
/**
* @param {!MediaKeyMessageEvent} event
* @private
*/
onSessionMessage_(event) {
if (this.delayLicenseRequest_()) {
this.mediaKeyMessageEvents_.push(event);
} else {
this.sendLicenseRequest_(event);
}
}
/**
* @return {boolean}
* @private
*/
delayLicenseRequest_() {
if (!this.video_) {
// If there's no video, don't delay the license request; i.e., in the case
// of offline storage.
return false;
}
return (this.config_.delayLicenseRequestUntilPlayed &&
this.video_.paused && !this.initialRequestsSent_);
}
/**
* Sends a license request.
* @param {!MediaKeyMessageEvent} event
* @private
*/
async sendLicenseRequest_(event) {
/** @type {!MediaKeySession} */
const session = event.target;
shaka.log.v1(
'Sending license request for session', session.sessionId, 'of type',
event.messageType);
if (this.config_.logLicenseExchange) {
const str = shaka.util.Uint8ArrayUtils.toBase64(event.message);
shaka.log.info('EME license request', str);
}
const metadata = this.activeSessions_.get(session);
let url = this.currentDrmInfo_.licenseServerUri;
const advancedConfig =
this.config_.advanced[this.currentDrmInfo_.keySystem];
if (event.messageType == 'individualization-request' && advancedConfig &&
advancedConfig.individualizationServer) {
url = advancedConfig.individualizationServer;
}
const requestType = shaka.net.NetworkingEngine.RequestType.LICENSE;
const request = shaka.net.NetworkingEngine.makeRequest(
[url], this.config_.retryParameters);
request.body = event.message;
request.method = 'POST';
request.licenseRequestType = event.messageType;
request.sessionId = session.sessionId;
// NOTE: allowCrossSiteCredentials can be set in a request filter.
if (this.currentDrmInfo_.keySystem == 'com.microsoft.playready' ||
this.currentDrmInfo_.keySystem == 'com.chromecast.playready') {
this.unpackPlayReadyRequest_(request);
}
const startTimeRequest = Date.now();
let response;
try {
const req = this.playerInterface_.netEngine.request(requestType, request);
response = await req.promise;
} catch (error) {
// Request failed!
goog.asserts.assert(error instanceof shaka.util.Error,
'Wrong NetworkingEngine error type!');
const shakaErr = new shaka.util.Error(
shaka.util.Error.Severity.CRITICAL,
shaka.util.Error.Category.DRM,
shaka.util.Error.Code.LICENSE_REQUEST_FAILED,
error);
this.onError_(shakaErr);
if (metadata && metadata.updatePromise) {
metadata.updatePromise.reject(shakaErr);
}
return;
}
if (this.destroyer_.destroyed()) {
return;
}
this.licenseTimeSeconds_ += (Date.now() - startTimeRequest) / 1000;
if (this.config_.logLicenseExchange) {
const str = shaka.util.Uint8ArrayUtils.toBase64(response.data);
shaka.log.info('EME license response', str);
}
// Request succeeded, now pass the response to the CDM.
try {
shaka.log.v1('Updating session', session.sessionId);
await session.update(response.data);
} catch (error) {
// Session update failed!
const shakaErr = new shaka.util.Error(
shaka.util.Error.Severity.CRITICAL,
shaka.util.Error.Category.DRM,
shaka.util.Error.Code.LICENSE_RESPONSE_REJECTED,
error.message);
this.onError_(shakaErr);
if (metadata && metadata.updatePromise) {
metadata.updatePromise.reject(shakaErr);
}
return;
}
const updateEvent = new shaka.util.FakeEvent('drmsessionupdate');
this.playerInterface_.onEvent(updateEvent);
if (metadata) {
if (metadata.updatePromise) {
metadata.updatePromise.resolve();
}
// In case there are no key statuses, consider this session loaded
// after a reasonable timeout. It should definitely not take 5
// seconds to process a license.
const timer = new shaka.util.Timer(() => {
metadata.loaded = true;
if (this.areAllSessionsLoaded_()) {
this.allSessionsLoaded_.resolve();
}
});
timer.tickAfter(
/* seconds= */ shaka.media.DrmEngine.SESSION_LOAD_TIMEOUT_);
}
}
/**
* Unpacks PlayReady license requests. Modifies the request object.
* @param {shaka.extern.Request} request
* @private
*/
unpackPlayReadyRequest_(request) {
// On IE and Edge, the raw license message is UTF-16-encoded XML. We need
// to unpack the Challenge element (base64-encoded string containing the
// actual license request) and any HttpHeader elements (sent as request
// headers).
// Example XML:
// <PlayReadyKeyMessage type="LicenseAcquisition">
// <LicenseAcquisition Version="1">
// <Challenge encoding="base64encoded">{Base64Data}</Challenge>
// <HttpHeaders>
// <HttpHeader>
// <name>Content-Type</name>
// <value>text/xml; charset=utf-8</value>
// </HttpHeader>
// <HttpHeader>
// <name>SOAPAction</name>
// <value>http://schemas.microsoft.com/DRM/etc/etc</value>
// </HttpHeader>
// </HttpHeaders>
// </LicenseAcquisition>
// </PlayReadyKeyMessage>
const xml = shaka.util.StringUtils.fromUTF16(
request.body, /* littleEndian= */ true, /* noThrow= */ true);
if (!xml.includes('PlayReadyKeyMessage')) {
// This does not appear to be a wrapped message as on IE and Edge. Some
// clients do not need this unwrapping, so we will assume this is one of
// them. Note that "xml" at this point probably looks like random
// garbage, since we interpreted UTF-8 as UTF-16.
shaka.log.debug('PlayReady request is already unwrapped.');
request.headers['Content-Type'] = 'text/xml; charset=utf-8';
return;
}
shaka.log.debug('Unwrapping PlayReady request.');
const dom = new DOMParser().parseFromString(xml, 'application/xml');
// Set request headers.
const headers = dom.getElementsByTagName('HttpHeader');
for (const header of headers) {
const name = header.getElementsByTagName('name')[0];
const value = header.getElementsByTagName('value')[0];
goog.asserts.assert(name && value, 'Malformed PlayReady headers!');
request.headers[name.textContent] = value.textContent;
}
// Unpack the base64-encoded challenge.
const challenge = dom.getElementsByTagName('Challenge')[0];
goog.asserts.assert(challenge, 'Malformed PlayReady challenge!');
goog.asserts.assert(challenge.getAttribute('encoding') == 'base64encoded',
'Unexpected PlayReady challenge encoding!');
request.body = shaka.util.Uint8ArrayUtils.fromBase64(challenge.textContent);
}
/**
* @param {!Event} event
* @private
* @suppress {invalidCasts} to swap keyId and status
*/
onKeyStatusesChange_(event) {
const session = /** @type {!MediaKeySession} */(event.target);
shaka.log.v2('Key status changed for session', session.sessionId);
const found = this.activeSessions_.get(session);
const keyStatusMap = session.keyStatuses;
let hasExpiredKeys = false;
keyStatusMap.forEach((status, keyId) => {
// The spec has changed a few times on the exact order of arguments here.
// As of 2016-06-30, Edge has the order reversed compared to the current
// EME spec. Given the back and forth in the spec, it may not be the only
// one. Try to detect this and compensate:
if (typeof keyId == 'string') {
const tmp = keyId;
keyId = /** @type {!ArrayBuffer} */(status);
status = /** @type {string} */(tmp);
}
// Microsoft's implementation in Edge seems to present key IDs as
// little-endian UUIDs, rather than big-endian or just plain array of
// bytes.
// standard: 6e 5a 1d 26 - 27 57 - 47 d7 - 80 46 ea a5 d1 d3 4b 5a
// on Edge: 26 1d 5a 6e - 57 27 - d7 47 - 80 46 ea a5 d1 d3 4b 5a
// Bug filed: https://bit.ly/2thuzXu
// NOTE that we skip this if byteLength != 16. This is used for the IE11
// and Edge 12 EME polyfill, which uses single-byte dummy key IDs.
// However, unlike Edge and Chromecast, Tizen doesn't have this problem.
if (this.currentDrmInfo_.keySystem == 'com.microsoft.playready' &&
keyId.byteLength == 16 &&
!shaka.util.Platform.isTizen() &&
!shaka.util.Platform.isVideoFutur() &&
!shaka.util.Platform.isWebOS() &&
!shaka.util.Platform.isTiVo()) {
// Read out some fields in little-endian:
const dataView = shaka.util.BufferUtils.toDataView(keyId);
const part0 = dataView.getUint32(0, /* LE= */ true);
const part1 = dataView.getUint16(4, /* LE= */ true);
const part2 = dataView.getUint16(6, /* LE= */ true);
// Write it back in big-endian:
dataView.setUint32(0, part0, /* BE= */ false);
dataView.setUint16(4, part1, /* BE= */ false);
dataView.setUint16(6, part2, /* BE= */ false);
}
// Microsoft's implementation in IE11 seems to never set key status to
// 'usable'. It is stuck forever at 'status-pending'. In spite of this,
// the keys do seem to be usable and content plays correctly.
// Bug filed: https://bit.ly/2tpIU3n
// Microsoft has fixed the issue on Edge, but it remains in IE.
if (this.currentDrmInfo_.keySystem == 'com.microsoft.playready' &&
status == 'status-pending') {
status = 'usable';
}
if (status != 'status-pending') {
found.loaded = true;
}
if (!found) {
// We can get a key status changed for a closed session after it has
// been removed from |activeSessions_|. If it is closed, none of its
// keys should be usable.
goog.asserts.assert(
status != 'usable', 'Usable keys found in closed session');
}
if (status == 'expired') {
hasExpiredKeys = true;
}
const keyIdHex = shaka.util.Uint8ArrayUtils.toHex(keyId);
this.keyStatusByKeyId_.set(keyIdHex, status);
});
// If the session has expired, close it.
// Some CDMs do not have sub-second time resolution, so the key status may
// fire with hundreds of milliseconds left until the stated expiration time.
const msUntilExpiration = session.expiration - Date.now();
if (msUntilExpiration < 0 || (hasExpiredKeys && msUntilExpiration < 1000)) {
// If this is part of a remove(), we don't want to close the session until
// the update is complete. Otherwise, we will orphan the session.
if (found && !found.updatePromise) {
shaka.log.debug('Session has expired', session.sessionId);
this.activeSessions_.delete(session);
session.close().catch(() => {}); // Silence uncaught rejection errors
}
}
if (!this.areAllSessionsLoaded_()) {
// Don't announce key statuses or resolve the "all loaded" promise until
// everything is loaded.
return;
}
this.allSessionsLoaded_.resolve();
// Batch up key status changes before checking them or notifying Player.
// This handles cases where the statuses of multiple sessions are set
// simultaneously by the browser before dispatching key status changes for
// each of them. By batching these up, we only send one status change event
// and at most one EXPIRED error on expiration.
this.keyStatusTimer_.tickAfter(
/* seconds= */ shaka.media.DrmEngine.KEY_STATUS_BATCH_TIME);
}
/** @private */
processKeyStatusChanges_() {
const privateMap = this.keyStatusByKeyId_;
const publicMap = this.announcedKeyStatusByKeyId_;
// Copy the latest key statuses into the publicly-accessible map.
publicMap.clear();
privateMap.forEach((status, keyId) => publicMap.set(keyId, status));
// If all keys are expired, fire an error. |every| is always true for an
// empty array but we shouldn't fire an error for a lack of key status info.
const statuses = Array.from(publicMap.values());
const allExpired = statuses.length &&
statuses.every((status) => status == 'expired');
if (allExpired) {
this.onError_(new shaka.util.Error(
shaka.util.Error.Severity.CRITICAL,
shaka.util.Error.Category.DRM,
shaka.util.Error.Code.EXPIRED));
}
this.playerInterface_.onKeyStatus(shaka.util.MapUtils.asObject(publicMap));
}
/**
* Returns true if the browser has recent EME APIs.
*
* @return {boolean}
*/
static isBrowserSupported() {
const basic =
!!window.MediaKeys &&
!!window.navigator &&
!!window.navigator.requestMediaKeySystemAccess &&
!!window.MediaKeySystemAccess &&
// eslint-disable-next-line no-rest