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Diffstat (limited to '')
-rw-r--r-- | testing/web-platform/tests/encrypted-media/polyfill/edge-keystatuses.js | 144 |
1 files changed, 144 insertions, 0 deletions
diff --git a/testing/web-platform/tests/encrypted-media/polyfill/edge-keystatuses.js b/testing/web-platform/tests/encrypted-media/polyfill/edge-keystatuses.js new file mode 100644 index 0000000000..8861444591 --- /dev/null +++ b/testing/web-platform/tests/encrypted-media/polyfill/edge-keystatuses.js @@ -0,0 +1,144 @@ +(function() { + + // This polyfill fixes the following problems with Edge browser + // (1) Various maplike methods for keystatuses are not supported or suported incorrectly + // (2) Key Ids exposed in keystatuses are incorrect (byte swaps) + if ( navigator.userAgent.toLowerCase().indexOf('edge') > -1 ) { + /////////////////////////////////////////////////////////////////////////////////////////////// + // The following function is the core of this JS patch. The rest of this file is infrastructure + // required to enable this function + /////////////////////////////////////////////////////////////////////////////////////////////// + function _proxyKeyStatusesChange( event ) { + this._keyStatuses.clear(); + var keyStatuses = []; + this._session.keyStatuses.forEach( function( keyId, status ) { + var newKeyId = new Uint8Array( keyId ); + + function swap( arr, a, b ) { var t = arr[a]; arr[a] = arr[b]; arr[b] = t; } + swap( newKeyId, 0, 3 ); + swap( newKeyId, 1, 2 ); + swap( newKeyId, 4, 5 ); + swap( newKeyId, 6, 7 ); + + keyStatuses.push( { key: newKeyId, status: status, ord: arrayBufferAsString( newKeyId ) } ); + }); + + function lexicographical( a, b ) { return a < b ? -1 : a === b ? 0 : +1; } + function lexicographicalkey( a, b ) { return lexicographical( a.ord, b.ord ); } + + keyStatuses.sort( lexicographicalkey ).forEach( function( obj ) { + this._keyStatuses._set( obj.key, obj.status ); + }.bind( this ) ); + + this.dispatchEvent( event ); + }; + /////////////////////////////////////////////////////////////////////////////////////////////// + + // Override MediaKeys.createSession + var _mediaKeysCreateSession = MediaKeys.prototype.createSession; + MediaKeys.prototype.createSession = function ( sessionType ) { + return new MediaKeySession( _mediaKeysCreateSession.call( this, sessionType ) ); + }; + + // MediaKeySession proxy + function MediaKeySession( session ) { + EventTarget.call( this ); + this._session = session; + this._keyStatuses = new MediaKeyStatusMap(); + this._session.addEventListener("keystatuseschange",this._onKeyStatusesChange.bind(this)); + this._session.addEventListener("message",this.dispatchEvent.bind(this)); + } + + MediaKeySession.prototype = Object.create( EventTarget.prototype ); + + Object.defineProperties( MediaKeySession.prototype, { + sessionId: { get: function() { return this._session.sessionId; } }, + expiration: { get: function() { return this._session.expiration; } }, + closed: { get: function() { return this._session.closed; } }, + keyStatuses:{ get: function() { return this._keyStatuses; } } + }); + + [ "generateRequest", "load", "update", "remove", "close" ].forEach( function( fnname ) { + MediaKeySession.prototype[ fnname ] = function() { + return window.MediaKeySession.prototype[ fnname ].apply( this._session, arguments ); + } + } ); + + MediaKeySession.prototype._onKeyStatusesChange = _proxyKeyStatusesChange; + + // MediaKeyStatusMap proxy + // + // We need a proxy class to replace the broken MediaKeyStatusMap one. We cannot use a + // regular Map directly because we need get and has methods to compare by value not + // as references. + function MediaKeyStatusMap() { this._map = new Map(); } + + Object.defineProperties( MediaKeyStatusMap.prototype, { + size: { get: function() { return this._map.size; } }, + forEach: { get: function() { return function( f ) { return this._map.forEach( f ); } } }, + entries: { get: function() { return function() { return this._map.entries(); } } }, + values: { get: function() { return function() { return this._map.values(); } } }, + keys: { get: function() { return function() { return this._map.keys(); } } }, + clear: { get: function() { return function() { return this._map.clear(); } } } } ); + + MediaKeyStatusMap.prototype[ Symbol.iterator ] = function() { return this._map[ Symbol.iterator ]() }; + + MediaKeyStatusMap.prototype.has = function has( keyId ) { + for ( var k of this._map.keys() ) { if ( arrayBufferEqual( k, keyId ) ) return true; } + return false; + }; + + MediaKeyStatusMap.prototype.get = function get( keyId ) { + for ( var k of this._map.entries() ) { if ( arrayBufferEqual( k[ 0 ], keyId ) ) return k[ 1 ]; } + }; + + MediaKeyStatusMap.prototype._set = function _set( keyId, status ) { + this._map.set( new Uint8Array( keyId ), status ); + }; + + function arrayBufferEqual(buf1, buf2) + { + if (buf1.byteLength !== buf2.byteLength) return false; + var a1 = Array.from( new Int8Array(buf1) ), a2 = Array.from( new Int8Array(buf2) ); + return a1.every( function( x, i ) { return x === a2[i]; } ); + } + + // EventTarget + 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); + } + }; + } +})(); |