1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
|
(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);
}
};
}
})();
|
