Add W3C encrypted-media tests

third_party/WebKit/LayoutTests/imported/wpt/encrypted-media/polyfill/edge-persistent-usage-record.js

+(function() {
+
+    // This polyfill fixes the following problems with Edge browser
+    // (1) To retrieve a persisted usage record, you must use session type 'persistent-release-message' instead of 'persistent-usage-record'
+    // (2) To retrieve a persisted usage record, you must call remove() after calling load()
+    // (3) On providing a license release acknowledgement, the session does not automatically close as is should
+    // (4) Retrieval of the usage record at the end of an active session is not supported
+
+    if ( navigator.userAgent.toLowerCase().indexOf('edge') > -1 ) {
+
+        var _mediaKeySystemAccessCreateMediaKeys = MediaKeySystemAccess.prototype.createMediaKeys;
+            _mediaKeysCreateSession = MediaKeys.prototype.createSession;
+
+        // MediaKeySession proxy
+        function MediaKeySession( mediaKeys, session )
+        {
+            EventTarget.call( this );
+
+            this._mediaKeys = mediaKeys;
+            this._session = session;
+            this._sessionId = undefined;
+            this._removing = false;
+
+            session.addEventListener( 'message', this.dispatchEvent.bind( this ) );
+            session.addEventListener( 'keystatuseschange', this.dispatchEvent.bind( this ) );
+            session.closed.then( function() { if ( !this._removing ) this._resolveClosed(); }.bind ( this ) );
+
+            this._closed = new Promise( function( resolve ) { this._resolveClosed = resolve; }.bind( this ) );
+        }
+
+        MediaKeySession.prototype = Object.create( EventTarget.prototype );
+
+        Object.defineProperties( MediaKeySession.prototype, {
+            sessionId:  { get: function() { return this._sessionId ? this._sessionId : this._session.sessionId; } },
+            expiration: { get: function() { return this._session.expiration; } },
+            closed:     { get: function() { return this._closed; } },
+            keyStatuses:{ get: function() { return this._session.keyStatuses; } }
+        });
+
+        // load()
+        //
+        // Use a surrogate 'persistent-release-message' session to obtain the release message
+        //
+        MediaKeySession.prototype.load = function load( sessionId )
+        {
+            if ( this.sessionId ) return Promise.reject( new DOMException('InvalidAccessError') );
+
+            this._surrogate = this._mediaKeys.createSession( 'persistent-release-message' );
+            this._surrogate.addEventListener( 'message', this.dispatchEvent.bind( this ) );
+
+            return this._surrogate.load( sessionId ).then( function( success ) {
+                if (!success) return false;
+
+                this._sessionId = sessionId;
+                this._removing = true;
+                this._session.close();
+
+                return this._surrogate.remove().then( function() { return true; } );
+            }.bind( this ) );
+        };
+
+        // remove()
+        //
+        // On an existing session, use a surrogate 'persistent-release-message' session to obtain the release message
+        //
+        MediaKeySession.prototype.remove = function remove()
+        {
+            if ( this._sessionId !== undefined ) return Promise.reject( new DOMException('InvalidAccessError') );
+            if ( this.sessionId === undefined ) return Promise.reject( new DOMException('InvalidAccessError') );
+
+            this._surrogate = this._mediaKeys.createSession( 'persistent-release-message' );
+            this._surrogate.addEventListener( 'message', this.dispatchEvent.bind( this ) );
+            this._removing = true;
+            this._sessionId = this._session.sessionId;
+
+            var self = this;
+
+            return Promise.all( [ self._session.close(), self._session.closed ] ).then( function() {
+                return self._surrogate.load( self._sessionId );
+            }).then( function( success ) {
+                if ( !success ) {
+                    throw new DOMException('InvalidAccessError');
+                }
+
+                return self._surrogate.remove();
+            }).then( function() { return true; } );
+        }
+
+        // update()
+        //
+        // For a normal session, pass through, otherwise update the surrogate and close the proxy
+        MediaKeySession.prototype.update = function update( message )
+        {
+            if ( !this._removing ) return this._session.update( message );
+
+            return this._surrogate.update( message ).then( function() {
+                this._sessionId = undefined;
+                this._resolveClosed();
+            }.bind( this ) );
+        };
+
+        // close() - pass through
+        //
+        MediaKeySession.prototype.close = function close()
+        {
+            if ( !this._removing ) return this._session.close();
+            this._resolveClosed();
+            return Promise.resolve();
+        };
+
+        // generateRequest() - pass through
+        //
+        MediaKeySession.prototype.generateRequest = function generateRequest( initDataType, initData )
+        {
+            if ( this.sessionId ) Promise.reject( new DOMException('InvalidAccessError') );
+            return this._session.generateRequest( initDataType, initData );
+        };
+
+        // Wrap PlayReady persistent-usage-record sessions in our Proxy
+        MediaKeys.prototype.createSession = function createSession( sessionType ) {
+
+            var session = _mediaKeysCreateSession.call( this, sessionType );
+            if ( this._keySystem !== 'com.microsoft.playready' || sessionType !== 'persistent-usage-record' )
+            {
+                return session;
+            }
+
+            return new MediaKeySession( this, session );
+
+        };
+
+        //
+        // Annotation polyfills - annotate not otherwise available data
+        //
+
+        // Annotate MediaKeys with the keysystem
+        MediaKeySystemAccess.prototype.createMediaKeys = function createMediaKeys()
+        {
+            return _mediaKeySystemAccessCreateMediaKeys.call( this ).then( function( mediaKeys ) {
+                mediaKeys._keySystem = this.keySystem;
+                return mediaKeys;
+            }.bind( this ) );
+        };
+
+        //
+        // Utilities
+        //
+
+        // Allow us to modify the target of Events
+        Object.defineProperties( Event.prototype, {
+            target: {   get: function() { return this._target || this.currentTarget; },
+                        set: function( newtarget ) { this._target = newtarget; } }
+        } );
+
+        // Make an EventTarget base class
+        function EventTarget(){
+            this.listeners = {};
+        };
+
+        EventTarget.prototype.listeners = null;
+
+        EventTarget.prototype.addEventListener = function(type, callback){
+            if(!(type in this.listeners)) {
+            this.listeners[type] = [];
+            }
+            this.listeners[type].push(callback);
+        };
+
+        EventTarget.prototype.removeEventListener = function(type, callback){
+            if(!(type in this.listeners)) {
+                return;
+            }
+            var stack = this.listeners[type];
+            for(var i = 0, l = stack.length; i < l; i++){
+                if(stack[i] === callback){
+                    stack.splice(i, 1);
+                    return this.removeEventListener(type, callback);
+                }
+            }
+        };
+
+        EventTarget.prototype.dispatchEvent = function(event){
+            if(!(event.type in this.listeners)) {
+                return;
+            }
+            var stack = this.listeners[event.type];
+            event.target = this;
+            for(var i = 0, l = stack.length; i < l; i++) {
+                stack[i].call(this, event);
+            }
+        };
+    }
+})();