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* @author Stephan Hesse <disparat@gmail.com> | <tchakabam@gmail.com>
*
* DRM support for Hls.js
*/
import EventHandler from '../event-handler';
import Event from '../events';
import { ErrorTypes, ErrorDetails } from '../errors';
import { logger } from '../utils/logger';
const MAX_LICENSE_REQUEST_FAILURES = 3;
/**
* @see https://developer.mozilla.org/en-US/docs/Web/API/Navigator/requestMediaKeySystemAccess
*/
const KeySystems = {
WIDEVINE: 'com.widevine.alpha',
PLAYREADY: 'com.microsoft.playready'
};
/**
* @see https://developer.mozilla.org/en-US/docs/Web/API/MediaKeySystemConfiguration
* @param {Array<string>} audioCodecs List of required audio codecs to support
* @param {Array<string>} videoCodecs List of required video codecs to support
* @param {object} drmSystemOptions Optional parameters/requirements for the key-system
* @returns {Array<MediaSystemConfiguration>} An array of supported configurations
*/
const createWidevineMediaKeySystemConfigurations = function (audioCodecs, videoCodecs, drmSystemOptions) { /* jshint ignore:line */
const baseConfig = {
// initDataTypes: ['keyids', 'mp4'],
// label: "",
// persistentState: "not-allowed", // or "required" ?
// distinctiveIdentifier: "not-allowed", // or "required" ?
// sessionTypes: ['temporary'],
videoCapabilities: [
// { contentType: 'video/mp4; codecs="avc1.42E01E"' }
]
};
videoCodecs.forEach((codec) => {
baseConfig.videoCapabilities.push({
contentType: `video/mp4; codecs="${codec}"`
});
});
return [
baseConfig
];
};
/**
* The idea here is to handle key-system (and their respective platforms) specific configuration differences
* in order to work with the local requestMediaKeySystemAccess method.
*
* We can also rule-out platform-related key-system support at this point by throwing an error or returning null.
*
* @param {string} keySystem Identifier for the key-system, see `KeySystems` enum
* @param {Array<string>} audioCodecs List of required audio codecs to support
* @param {Array<string>} videoCodecs List of required video codecs to support
* @returns {Array<MediaSystemConfiguration> | null} A non-empty Array of MediaKeySystemConfiguration objects or `null`
*/
const getSupportedMediaKeySystemConfigurations = function (keySystem, audioCodecs, videoCodecs) {
switch (keySystem) {
case KeySystems.WIDEVINE:
return createWidevineMediaKeySystemConfigurations(audioCodecs, videoCodecs);
default:
throw Error('Unknown key-system: ' + keySystem);
}
};
/**
* Controller to deal with encrypted media extensions (EME)
* @see https://developer.mozilla.org/en-US/docs/Web/API/Encrypted_Media_Extensions_API
*
* @class
* @constructor
*/
class EMEController extends EventHandler {
/**
* @constructs
* @param {Hls} hls Our Hls.js instance
*/
constructor (hls) {
super(hls,
Event.MEDIA_ATTACHED,
Event.MANIFEST_PARSED
);
this._widevineLicenseUrl = hls.config.widevineLicenseUrl;
this._licenseXhrSetup = hls.config.licenseXhrSetup;
this._emeEnabled = hls.config.emeEnabled;
this._requestMediaKeySystemAccess = hls.config.requestMediaKeySystemAccessFunc;
this._mediaKeysList = [];
this._media = null;
this._hasSetMediaKeys = false;
this._isMediaEncrypted = false;
this._requestLicenseFailureCount = 0;
}
/**
*
* @param {string} keySystem Identifier for the key-system, see `KeySystems` enum
* @returns {string} License server URL for key-system (if any configured, otherwise causes error)
*/
getLicenseServerUrl (keySystem) {
let url;
switch (keySystem) {
case KeySystems.WIDEVINE:
url = this._widevineLicenseUrl;
break;
default:
url = null;
break;
}
if (!url) {
logger.error(`No license server URL configured for key-system "${keySystem}"`);
this.hls.trigger(Event.ERROR, {
type: ErrorTypes.KEY_SYSTEM_ERROR,
details: ErrorDetails.KEY_SYSTEM_LICENSE_REQUEST_FAILED,
fatal: true
});
}
return url;
}
/**
* Requests access object and adds it to our list upon success
* @private
* @param {string} keySystem System ID (see `KeySystems`)
* @param {Array<string>} audioCodecs List of required audio codecs to support
* @param {Array<string>} videoCodecs List of required video codecs to support
*/
_attemptKeySystemAccess (keySystem, audioCodecs, videoCodecs) {
// TODO: add other DRM "options"
const mediaKeySystemConfigs = getSupportedMediaKeySystemConfigurations(keySystem, audioCodecs, videoCodecs);
Iif (!mediaKeySystemConfigs) {
logger.warn('Can not create config for key-system (maybe because platform is not supported):', keySystem);
return;
}
logger.log('Requesting encrypted media key-system access');
// expecting interface like window.navigator.requestMediaKeySystemAccess
this.requestMediaKeySystemAccess(keySystem, mediaKeySystemConfigs)
.then((mediaKeySystemAccess) => {
this._onMediaKeySystemAccessObtained(keySystem, mediaKeySystemAccess);
})
.catch((err) => {
logger.error(`Failed to obtain key-system "${keySystem}" access:`, err);
});
}
get requestMediaKeySystemAccess () {
Iif (!this._requestMediaKeySystemAccess)
throw new Error('No requestMediaKeySystemAccess function configured');
return this._requestMediaKeySystemAccess;
}
/**
* Handles obtaining access to a key-system
*
* @param {string} keySystem
* @param {MediaKeySystemAccess} mediaKeySystemAccess https://developer.mozilla.org/en-US/docs/Web/API/MediaKeySystemAccess
*/
_onMediaKeySystemAccessObtained (keySystem, mediaKeySystemAccess) {
logger.log(`Access for key-system "${keySystem}" obtained`);
const mediaKeysListItem = {
mediaKeys: null,
mediaKeysSession: null,
mediaKeysSessionInitialized: false,
mediaKeySystemAccess: mediaKeySystemAccess,
mediaKeySystemDomain: keySystem
};
this._mediaKeysList.push(mediaKeysListItem);
mediaKeySystemAccess.createMediaKeys()
.then((mediaKeys) => {
mediaKeysListItem.mediaKeys = mediaKeys;
logger.log(`Media-keys created for key-system "${keySystem}"`);
this._onMediaKeysCreated();
})
.catch((err) => {
logger.error('Failed to create media-keys:', err);
});
}
/**
* Handles key-creation (represents access to CDM). We are going to create key-sessions upon this
* for all existing keys where no session exists yet.
*/
_onMediaKeysCreated () {
// check for all key-list items if a session exists, otherwise, create one
this._mediaKeysList.forEach((mediaKeysListItem) => {
if (!mediaKeysListItem.mediaKeysSession) {
mediaKeysListItem.mediaKeysSession = mediaKeysListItem.mediaKeys.createSession();
this._onNewMediaKeySession(mediaKeysListItem.mediaKeysSession);
}
});
}
/**
*
* @param {*} keySession
*/
_onNewMediaKeySession (keySession) {
logger.log(`New key-system session ${keySession.sessionId}`);
keySession.addEventListener('message', (event) => {
this._onKeySessionMessage(keySession, event.message);
}, false);
}
_onKeySessionMessage (keySession, message) {
logger.log('Got EME message event, creating license request');
this._requestLicense(message, (data) => {
logger.log('Received license data, updating key-session');
keySession.update(data);
});
}
_onMediaEncrypted (initDataType, initData) {
logger.log(`Media is encrypted using "${initDataType}" init data type`);
this._isMediaEncrypted = true;
this._mediaEncryptionInitDataType = initDataType;
this._mediaEncryptionInitData = initData;
this._attemptSetMediaKeys();
this._generateRequestWithPreferredKeySession();
}
_attemptSetMediaKeys () {
Eif (!this._hasSetMediaKeys) {
// FIXME: see if we can/want/need-to really to deal with several potential key-sessions?
const keysListItem = this._mediaKeysList[0];
Eif (!keysListItem || !keysListItem.mediaKeys) {
logger.error('Fatal: Media is encrypted but no CDM access or no keys have been obtained yet');
this.hls.trigger(Event.ERROR, {
type: ErrorTypes.KEY_SYSTEM_ERROR,
details: ErrorDetails.KEY_SYSTEM_NO_KEYS,
fatal: true
});
return;
}
logger.log('Setting keys for encrypted media');
this._media.setMediaKeys(keysListItem.mediaKeys);
this._hasSetMediaKeys = true;
}
}
_generateRequestWithPreferredKeySession () {
// FIXME: see if we can/want/need-to really to deal with several potential key-sessions?
const keysListItem = this._mediaKeysList[0];
Eif (!keysListItem) {
logger.error('Fatal: Media is encrypted but not any key-system access has been obtained yet');
this.hls.trigger(Event.ERROR, {
type: ErrorTypes.KEY_SYSTEM_ERROR,
details: ErrorDetails.KEY_SYSTEM_NO_ACCESS,
fatal: true
});
return;
}
if (keysListItem.mediaKeysSessionInitialized) {
logger.warn('Key-Session already initialized but requested again');
return;
}
const keySession = keysListItem.mediaKeysSession;
if (!keySession) {
logger.error('Fatal: Media is encrypted but no key-session existing');
this.hls.trigger(Event.ERROR, {
type: ErrorTypes.KEY_SYSTEM_ERROR,
details: ErrorDetails.KEY_SYSTEM_NO_SESSION,
fatal: true
});
}
const initDataType = this._mediaEncryptionInitDataType;
const initData = this._mediaEncryptionInitData;
logger.log(`Generating key-session request for "${initDataType}" init data type`);
keysListItem.mediaKeysSessionInitialized = true;
keySession.generateRequest(initDataType, initData)
.then(() => {
logger.debug('Key-session generation succeeded');
})
.catch((err) => {
logger.error('Error generating key-session request:', err);
this.hls.trigger(Event.ERROR, {
type: ErrorTypes.KEY_SYSTEM_ERROR,
details: ErrorDetails.KEY_SYSTEM_NO_SESSION,
fatal: false
});
});
}
/**
* @param {string} url License server URL
* @param {ArrayBuffer} keyMessage Message data issued by key-system
* @param {function} callback Called when XHR has succeeded
* @returns {XMLHttpRequest} Unsent (but opened state) XHR object
*/
_createLicenseXhr (url, keyMessage, callback) {
const xhr = new XMLHttpRequest();
const licenseXhrSetup = this._licenseXhrSetup;
try {
if (licenseXhrSetup) {
try {
licenseXhrSetup(xhr, url);
} catch (e) {
// let's try to open before running setup
xhr.open('POST', url, true);
licenseXhrSetup(xhr, url);
}
}
// if licenseXhrSetup did not yet call open, let's do it now
if (!xhr.readyState)
xhr.open('POST', url, true);
} catch (e) {
// IE11 throws an exception on xhr.open if attempting to access an HTTP resource over HTTPS
logger.error('Error setting up key-system license XHR', e);
this.hls.trigger(Event.ERROR, {
type: ErrorTypes.KEY_SYSTEM_ERROR,
details: ErrorDetails.KEY_SYSTEM_LICENSE_REQUEST_FAILED,
fatal: true
});
return;
}
xhr.responseType = 'arraybuffer';
xhr.onreadystatechange =
this._onLicenseRequestReadyStageChange.bind(this, xhr, url, keyMessage, callback);
return xhr;
}
/**
* @param {XMLHttpRequest} xhr
* @param {string} url License server URL
* @param {ArrayBuffer} keyMessage Message data issued by key-system
* @param {function} callback Called when XHR has succeeded
*
*/
_onLicenseRequestReadyStageChange (xhr, url, keyMessage, callback) {
switch (xhr.readyState) {
case 4:
if (xhr.status === 200) {
this._requestLicenseFailureCount = 0;
logger.log('License request succeeded');
callback(xhr.response);
} else {
logger.error(`License Request XHR failed (${url}). Status: ${xhr.status} (${xhr.statusText})`);
this._requestLicenseFailureCount++;
if (this._requestLicenseFailureCount <= MAX_LICENSE_REQUEST_FAILURES) {
const attemptsLeft = MAX_LICENSE_REQUEST_FAILURES - this._requestLicenseFailureCount + 1;
logger.warn(`Retrying license request, ${attemptsLeft} attempts left`);
this._requestLicense(keyMessage, callback);
return;
}
this.hls.trigger(Event.ERROR, {
type: ErrorTypes.KEY_SYSTEM_ERROR,
details: ErrorDetails.KEY_SYSTEM_LICENSE_REQUEST_FAILED,
fatal: true
});
}
break;
}
}
/**
* @param {object} keysListItem
* @param {ArrayBuffer} keyMessage
* @returns {ArrayBuffer} Challenge data posted to license server
*/
_generateLicenseRequestChallenge (keysListItem, keyMessage) {
let challenge;
if (keysListItem.mediaKeySystemDomain === KeySystems.PLAYREADY) {
logger.error('PlayReady is not supported (yet)');
// from https://github.com/MicrosoftEdge/Demos/blob/master/eme/scripts/demo.js
/*
if (this.licenseType !== this.LICENSE_TYPE_WIDEVINE) {
// For PlayReady CDMs, we need to dig the Challenge out of the XML.
var keyMessageXml = new DOMParser().parseFromString(String.fromCharCode.apply(null, new Uint16Array(keyMessage)), 'application/xml');
if (keyMessageXml.getElementsByTagName('Challenge')[0]) {
challenge = atob(keyMessageXml.getElementsByTagName('Challenge')[0].childNodes[0].nodeValue);
} else {
throw 'Cannot find <Challenge> in key message';
}
var headerNames = keyMessageXml.getElementsByTagName('name');
var headerValues = keyMessageXml.getElementsByTagName('value');
if (headerNames.length !== headerValues.length) {
throw 'Mismatched header <name>/<value> pair in key message';
}
for (var i = 0; i < headerNames.length; i++) {
xhr.setRequestHeader(headerNames[i].childNodes[0].nodeValue, headerValues[i].childNodes[0].nodeValue);
}
}
*/
} else if (keysListItem.mediaKeySystemDomain === KeySystems.WIDEVINE) {
// For Widevine CDMs, the challenge is the keyMessage.
challenge = keyMessage;
} else {
logger.error('Unsupported key-system:', keysListItem.mediaKeySystemDomain);
}
return challenge;
}
_requestLicense (keyMessage, callback) {
logger.log('Requesting content license for key-system');
const keysListItem = this._mediaKeysList[0];
if (!keysListItem) {
logger.error('Fatal error: Media is encrypted but no key-system access has been obtained yet');
this.hls.trigger(Event.ERROR, {
type: ErrorTypes.KEY_SYSTEM_ERROR,
details: ErrorDetails.KEY_SYSTEM_NO_ACCESS,
fatal: true
});
return;
}
const url = this.getLicenseServerUrl(keysListItem.mediaKeySystemDomain);
const xhr = this._createLicenseXhr(url, keyMessage, callback);
logger.log(`Sending license request to URL: ${url}`);
xhr.send(this._generateLicenseRequestChallenge(keysListItem, keyMessage));
}
onMediaAttached (data) {
if (!this._emeEnabled)
return;
const media = data.media;
// keep reference of media
this._media = media;
// FIXME: also handle detaching media !
media.addEventListener('encrypted', (e) => {
this._onMediaEncrypted(e.initDataType, e.initData);
});
}
onManifestParsed (data) {
if (!this._emeEnabled)
return;
const audioCodecs = data.levels.map((level) => level.audioCodec);
const videoCodecs = data.levels.map((level) => level.videoCodec);
this._attemptKeySystemAccess(KeySystems.WIDEVINE, audioCodecs, videoCodecs);
}
}
export default EMEController;
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