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* The copyright in this software is being made available under the BSD License,
* included below. This software may be subject to other third party and contributor
* rights, including patent rights, and no such rights are granted under this license.
*
* Copyright (c) 2013, Dash Industry Forum.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation and/or
* other materials provided with the distribution.
* * Neither the name of Dash Industry Forum nor the names of its
* contributors may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS AS IS AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/**
* Most recent EME implementation
*
* Implemented by Google Chrome v36+ (Windows, OSX, Linux)
*
* @implements ProtectionModel
* @class
*/
import ProtectionKeyController from '../controllers/ProtectionKeyController.js';
import NeedKey from '../vo/NeedKey.js';
import ProtectionErrors from '../errors/ProtectionErrors.js';
import DashJSError from '../../vo/DashJSError.js';
import KeyMessage from '../vo/KeyMessage.js';
import KeySystemAccess from '../vo/KeySystemAccess.js';
import ProtectionConstants from '../../constants/ProtectionConstants.js';
import FactoryMaker from '../../../core/FactoryMaker.js';
const SYSTEM_STRING_PRIORITY = {};
SYSTEM_STRING_PRIORITY[ProtectionConstants.PLAYREADY_KEYSTEM_STRING] = [ProtectionConstants.PLAYREADY_KEYSTEM_STRING, ProtectionConstants.PLAYREADY_RECOMMENDATION_KEYSTEM_STRING];
SYSTEM_STRING_PRIORITY[ProtectionConstants.WIDEVINE_KEYSTEM_STRING] = [ProtectionConstants.WIDEVINE_KEYSTEM_STRING];
SYSTEM_STRING_PRIORITY[ProtectionConstants.CLEARKEY_KEYSTEM_STRING] = [ProtectionConstants.CLEARKEY_KEYSTEM_STRING];
function DefaultProtectionModel(config) {
config = config || {};
const context = this.context;
const eventBus = config.eventBus;//Need to pass in here so we can use same instance since this is optional module
const events = config.events;
const debug = config.debug;
let instance,
logger,
keySystem,
videoElement,
mediaKeys,
sessionTokens,
eventHandler,
protectionKeyController;
function setup() {
logger = debug.getLogger(instance);
keySystem = null;
videoElement = null;
mediaKeys = null;
sessionTokens = [];
protectionKeyController = ProtectionKeyController(context).getInstance();
eventHandler = createEventHandler();
}
function reset() {
const numSessions = sessionTokens.length;
let session;
if (numSessions !== 0) {
// Called when we are done closing a session. Success or fail
const done = function (session) {
removeSession(session);
if (sessionTokens.length === 0) {
if (videoElement) {
videoElement.removeEventListener('encrypted', eventHandler);
videoElement.setMediaKeys(null).then(function () {
eventBus.trigger(events.TEARDOWN_COMPLETE);
});
} else {
eventBus.trigger(events.TEARDOWN_COMPLETE);
}
}
};
for (let i = 0; i < numSessions; i++) {
session = sessionTokens[i];
(function (s) {
_closeKeySessionInternal(session)
done(s);
})(session);
}
} else {
eventBus.trigger(events.TEARDOWN_COMPLETE);
}
}
function stop() {
// Close and remove not usable sessions
let session;
for (let i = 0; i < sessionTokens.length; i++) {
session = sessionTokens[i];
if (!session.getUsable()) {
_closeKeySessionInternal(session)
removeSession(session);
}
}
}
function getAllInitData() {
const retVal = [];
for (let i = 0; i < sessionTokens.length; i++) {
if (sessionTokens[i].initData) {
retVal.push(sessionTokens[i].initData);
}
}
return retVal;
}
function getSessionTokens() {
return sessionTokens;
}
function requestKeySystemAccess(keySystemConfigurationsToRequest) {
return new Promise((resolve, reject) => {
_requestKeySystemAccessInternal(keySystemConfigurationsToRequest, 0, resolve, reject);
})
}
/**
* Initializes access to a key system. Once we found a valid configuration we get a mediaKeySystemAccess object
* @param keySystemConfigurationsToRequest
* @param idx
* @param resolve
* @param reject
* @private
*/
function _requestKeySystemAccessInternal(keySystemConfigurationsToRequest, idx, resolve, reject) {
// In case requestMediaKeySystemAccess is not available we can not proceed and dispatch an error
if (navigator.requestMediaKeySystemAccess === undefined ||
typeof navigator.requestMediaKeySystemAccess !== 'function') {
const msg = 'Insecure origins are not allowed';
eventBus.trigger(events.KEY_SYSTEM_ACCESS_COMPLETE, { error: msg });
reject({ error: msg });
return;
}
// If a systemStringPriority is defined by the application we use these values. Otherwise, we use the default system string
// This is useful for DRM systems such as Playready for which multiple system strings are possible for instance com.microsoft.playready and com.microsoft.playready.recommendation
const protDataSystemStringPriority = keySystemConfigurationsToRequest[idx].protData && keySystemConfigurationsToRequest[idx].protData.systemStringPriority ? keySystemConfigurationsToRequest[idx].protData.systemStringPriority : null;
const configs = keySystemConfigurationsToRequest[idx].configs;
const currentKeySystem = keySystemConfigurationsToRequest[idx].ks;
let systemString = currentKeySystem.systemString;
// Use the default values in case no values are provided by the application
const systemStringsToApply = protDataSystemStringPriority ? protDataSystemStringPriority : SYSTEM_STRING_PRIORITY[systemString] ? SYSTEM_STRING_PRIORITY[systemString] : [systemString];
// Check all the available system strings and the available configurations for support
_checkAccessForKeySystem(systemStringsToApply, configs)
.then((data) => {
const configuration = data && data.nativeMediaKeySystemAccessObject && typeof data.nativeMediaKeySystemAccessObject.getConfiguration === 'function' ?
data.nativeMediaKeySystemAccessObject.getConfiguration() : null;
const keySystemAccess = new KeySystemAccess(currentKeySystem, configuration);
keySystemAccess.selectedSystemString = data.selectedSystemString;
keySystemAccess.nativeMediaKeySystemAccessObject = data.nativeMediaKeySystemAccessObject;
eventBus.trigger(events.KEY_SYSTEM_ACCESS_COMPLETE, { data: keySystemAccess });
resolve({ data: keySystemAccess });
})
.catch((e) => {
if (idx + 1 < keySystemConfigurationsToRequest.length) {
_requestKeySystemAccessInternal(keySystemConfigurationsToRequest, idx + 1, resolve, reject);
} else {
const errorMessage = 'Key system access denied! ';
eventBus.trigger(events.KEY_SYSTEM_ACCESS_COMPLETE, { error: errorMessage + e.message });
reject({ error: errorMessage + e.message });
}
})
}
/**
* For a specific key system: Iterate over the possible system strings and resolve once a valid configuration was found
* @param {array} systemStringsToApply
* @param {object} configs
* @return {Promise}
* @private
*/
function _checkAccessForKeySystem(systemStringsToApply, configs) {
return new Promise((resolve, reject) => {
_checkAccessForSystemStrings(systemStringsToApply, configs, 0, resolve, reject);
})
}
/**
* Recursively iterate over the possible system strings until a supported configuration is found or we ran out of options
* @param {array} systemStringsToApply
* @param {object} configs
* @param {number} idx
* @param {function} resolve
* @param {function} reject
* @private
*/
function _checkAccessForSystemStrings(systemStringsToApply, configs, idx, resolve, reject) {
const systemString = systemStringsToApply[idx];
logger.debug(`Requesting key system access for system string ${systemString}`);
navigator.requestMediaKeySystemAccess(systemString, configs)
.then((mediaKeySystemAccess) => {
resolve({ nativeMediaKeySystemAccessObject: mediaKeySystemAccess, selectedSystemString: systemString });
})
.catch((e) => {
if (idx + 1 < systemStringsToApply.length) {
_checkAccessForSystemStrings(systemStringsToApply, configs, idx + 1, resolve, reject);
} else {
reject(e);
}
});
}
/**
* Selects a key system by creating the mediaKeys and adding them to the video element
* @param keySystemAccess
* @return {Promise<unknown>}
*/
function selectKeySystem(keySystemAccess) {
return new Promise((resolve, reject) => {
keySystemAccess.nativeMediaKeySystemAccessObject.createMediaKeys()
.then((mkeys) => {
keySystem = keySystemAccess.keySystem;
mediaKeys = mkeys;
if (videoElement) {
return videoElement.setMediaKeys(mediaKeys)
} else {
return Promise.resolve();
}
})
.then(() => {
resolve(keySystem);
})
.catch(function () {
reject({ error: 'Error selecting keys system (' + keySystemAccess.keySystem.systemString + ')! Could not create MediaKeys -- TODO' });
});
})
}
function setMediaElement(mediaElement) {
if (videoElement === mediaElement) {
return;
}
// Replacing the previous element
if (videoElement) {
videoElement.removeEventListener('encrypted', eventHandler);
if (videoElement.setMediaKeys) {
videoElement.setMediaKeys(null);
}
}
videoElement = mediaElement;
// Only if we are not detaching from the existing element
if (videoElement) {
videoElement.addEventListener('encrypted', eventHandler);
if (videoElement.setMediaKeys && mediaKeys) {
videoElement.setMediaKeys(mediaKeys);
}
}
}
function setServerCertificate(serverCertificate) {
return new Promise((resolve) => {
mediaKeys.setServerCertificate(serverCertificate)
.then(function () {
logger.info('DRM: License server certificate successfully updated.');
eventBus.trigger(events.SERVER_CERTIFICATE_UPDATED);
resolve();
})
.catch((error) => {
eventBus.trigger(events.SERVER_CERTIFICATE_UPDATED, { error: new DashJSError(ProtectionErrors.SERVER_CERTIFICATE_UPDATED_ERROR_CODE, ProtectionErrors.SERVER_CERTIFICATE_UPDATED_ERROR_MESSAGE + error.name) });
resolve()
});
})
}
/**
* Create a key session, a session token and initialize a request by calling generateRequest
* @param keySystemMetadata
*/
function createKeySession(keySystemMetadata) {
if (!keySystem || !mediaKeys) {
throw new Error('Can not create sessions until you have selected a key system');
}
const mediaKeySession = mediaKeys.createSession(keySystemMetadata.sessionType);
const sessionToken = _createSessionToken(mediaKeySession, keySystemMetadata);
// The "keyids" type is used for Clearkey when keys are provided directly in the protection data and a request to a license server is not needed
const dataType = keySystem.systemString === ProtectionConstants.CLEARKEY_KEYSTEM_STRING && (keySystemMetadata.initData || (keySystemMetadata.protData && keySystemMetadata.protData.clearkeys)) ? ProtectionConstants.INITIALIZATION_DATA_TYPE_KEYIDS : ProtectionConstants.INITIALIZATION_DATA_TYPE_CENC;
mediaKeySession.generateRequest(dataType, keySystemMetadata.initData)
.then(function () {
logger.debug('DRM: Session created. SessionID = ' + sessionToken.getSessionId());
eventBus.trigger(events.KEY_SESSION_CREATED, { data: sessionToken });
})
.catch(function (error) {
removeSession(sessionToken);
eventBus.trigger(events.KEY_SESSION_CREATED, {
data: null,
error: new DashJSError(ProtectionErrors.KEY_SESSION_CREATED_ERROR_CODE, ProtectionErrors.KEY_SESSION_CREATED_ERROR_MESSAGE + 'Error generating key request -- ' + error.name)
});
});
}
function updateKeySession(sessionToken, message) {
const session = sessionToken.session;
// Send our request to the key session
if (protectionKeyController.isClearKey(keySystem)) {
message = message.toJWK();
}
session.update(message)
.then(() => {
eventBus.trigger(events.KEY_SESSION_UPDATED);
})
.catch(function (error) {
eventBus.trigger(events.KEY_ERROR, { error: new DashJSError(ProtectionErrors.MEDIA_KEYERR_CODE, 'Error sending update() message! ' + error.name, sessionToken) });
});
}
function loadKeySession(keySystemMetadata) {
if (!keySystem || !mediaKeys) {
throw new Error('Can not load sessions until you have selected a key system');
}
const sessionId = keySystemMetadata.sessionId;
// Check if session Id is not already loaded or loading
for (let i = 0; i < sessionTokens.length; i++) {
if (sessionId === sessionTokens[i].sessionId) {
logger.warn('DRM: Ignoring session ID because we have already seen it!');
return;
}
}
const session = mediaKeys.createSession(keySystemMetadata.sessionType);
const sessionToken = _createSessionToken(session, keySystemMetadata);
sessionToken.hasTriggeredKeyStatusMapUpdate = true;
// Load persisted session data into our newly created session object
session.load(sessionId).then(function (success) {
if (success) {
logger.debug('DRM: Session loaded. SessionID = ' + sessionToken.getSessionId());
eventBus.trigger(events.KEY_SESSION_CREATED, { data: sessionToken });
} else {
removeSession(sessionToken);
eventBus.trigger(events.KEY_SESSION_CREATED, {
data: null,
error: new DashJSError(ProtectionErrors.KEY_SESSION_CREATED_ERROR_CODE, ProtectionErrors.KEY_SESSION_CREATED_ERROR_MESSAGE + 'Could not load session! Invalid Session ID (' + sessionId + ')')
});
}
}).catch(function (error) {
removeSession(sessionToken);
eventBus.trigger(events.KEY_SESSION_CREATED, {
data: null,
error: new DashJSError(ProtectionErrors.KEY_SESSION_CREATED_ERROR_CODE, ProtectionErrors.KEY_SESSION_CREATED_ERROR_MESSAGE + 'Could not load session (' + sessionId + ')! ' + error.name)
});
});
}
function removeKeySession(sessionToken) {
const session = sessionToken.session;
session.remove().then(function () {
logger.debug('DRM: Session removed. SessionID = ' + sessionToken.getSessionId());
eventBus.trigger(events.KEY_SESSION_REMOVED, { data: sessionToken.getSessionId() });
}, function (error) {
eventBus.trigger(events.KEY_SESSION_REMOVED, {
data: null,
error: 'Error removing session (' + sessionToken.getSessionId() + '). ' + error.name
});
});
}
function closeKeySession(sessionToken) {
// Send our request to the key session
_closeKeySessionInternal(sessionToken).catch(function (error) {
removeSession(sessionToken);
eventBus.trigger(events.KEY_SESSION_CLOSED, {
data: null,
error: 'Error closing session (' + sessionToken.getSessionId() + ') ' + error.name
});
});
}
function _closeKeySessionInternal(sessionToken) {
if (!sessionToken || !sessionToken.session) {
return Promise.resolve;
}
const session = sessionToken.session;
// Remove event listeners
session.removeEventListener('keystatuseschange', sessionToken);
session.removeEventListener('message', sessionToken);
// Send our request to the key session
return session.close();
}
// This is our main event handler for all desired HTMLMediaElement events
// related to EME. These events are translated into our API-independent
// versions of the same events
function createEventHandler() {
return {
handleEvent: function (event) {
switch (event.type) {
case 'encrypted':
if (event.initData) {
let initData = ArrayBuffer.isView(event.initData) ? event.initData.buffer : event.initData;
eventBus.trigger(events.NEED_KEY, { key: new NeedKey(initData, event.initDataType) });
}
break;
}
}
};
}
function removeSession(token) {
// Remove from our session list
for (let i = 0; i < sessionTokens.length; i++) {
if (sessionTokens[i] === token) {
sessionTokens.splice(i, 1);
break;
}
}
}
// Function to create our session token objects which manage the EME
// MediaKeySession and session-specific event handler
function _createSessionToken(session, keySystemMetadata) {
const token = { // Implements SessionToken
session: session,
keyId: keySystemMetadata.keyId,
normalizedKeyId: keySystemMetadata && keySystemMetadata.keyId && typeof keySystemMetadata.keyId === 'string' ? keySystemMetadata.keyId.replace(/-/g, '').toLowerCase() : '',
initData: keySystemMetadata.initData,
sessionId: keySystemMetadata.sessionId,
sessionType: keySystemMetadata.sessionType,
hasTriggeredKeyStatusMapUpdate: false,
// This is our main event handler for all desired MediaKeySession events
// These events are translated into our API-independent versions of the
// same events
handleEvent: function (event) {
switch (event.type) {
case 'keystatuseschange':
this._onKeyStatusesChange(event);
break;
case 'message':
this._onKeyMessage(event);
break;
}
},
_onKeyStatusesChange: function (event) {
eventBus.trigger(events.KEY_STATUSES_CHANGED, { data: this });
const keyStatuses = [];
event.target.keyStatuses.forEach(function () {
keyStatuses.push(_parseKeyStatus(arguments));
});
eventBus.trigger(events.INTERNAL_KEY_STATUSES_CHANGED, {
parsedKeyStatuses: keyStatuses,
sessionToken: token
});
},
_onKeyMessage: function (event) {
let message = ArrayBuffer.isView(event.message) ? event.message.buffer : event.message;
eventBus.trigger(events.INTERNAL_KEY_MESSAGE, { data: new KeyMessage(this, message, undefined, event.messageType) });
},
getKeyId: function () {
return this.keyId;
},
getSessionId: function () {
return session.sessionId;
},
getSessionType: function () {
return this.sessionType;
},
getExpirationTime: function () {
return session.expiration;
},
getKeyStatuses: function () {
return session.keyStatuses;
},
getUsable: function () {
let usable = false;
session.keyStatuses.forEach(function () {
let keyStatus = _parseKeyStatus(arguments);
if (keyStatus.status === ProtectionConstants.MEDIA_KEY_STATUSES.USABLE) {
usable = true;
}
});
return usable;
}
};
// Add all event listeners
session.addEventListener('keystatuseschange', token);
session.addEventListener('message', token);
// Register callback for session closed Promise
session.closed.then(() => {
removeSession(token);
logger.debug('DRM: Session closed. SessionID = ' + token.getSessionId());
eventBus.trigger(events.KEY_SESSION_CLOSED, { data: token.getSessionId() });
});
// Add to our session list
sessionTokens.push(token);
return token;
}
function _parseKeyStatus(args) {
// Edge and Chrome implement different version of keystatuses, param are not on same order
let status, keyId;
if (args && args.length > 0) {
if (args[0]) {
if (typeof args[0] === 'string') {
status = args[0];
} else {
keyId = args[0];
}
}
if (args[1]) {
if (typeof args[1] === 'string') {
status = args[1];
} else {
keyId = args[1];
}
}
}
return {
status: status,
keyId: keyId
};
}
instance = {
closeKeySession,
createKeySession,
getAllInitData,
getSessionTokens,
loadKeySession,
removeKeySession,
requestKeySystemAccess,
reset,
selectKeySystem,
setMediaElement,
setServerCertificate,
stop,
updateKeySession,
};
setup();
return instance;
}
DefaultProtectionModel.__dashjs_factory_name = 'DefaultProtectionModel';
export default FactoryMaker.getClassFactory(DefaultProtectionModel);
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