content/test/data/media/encrypted_media_utils.js

   1 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 var keySystem = QueryString.keysystem;
   6 var mediaFile = QueryString.mediafile;
   7 var mediaType = QueryString.mediatype || 'video/webm; codecs="vorbis, vp8"';
   8 var useMSE = QueryString.usemse == 1;
   9
  10 // Default key used to encrypt many media files used in browser tests.
  11 var KEY = new Uint8Array([0xeb, 0xdd, 0x62, 0xf1, 0x68, 0x14, 0xd2, 0x7b,
  12                           0x68, 0xef, 0x12, 0x2a, 0xfc, 0xe4, 0xae, 0x3c]);
  13 // KEY_ID constant used as init data while encrypting test media files.
  14 var KEY_ID = getInitDataFromKeyId("0123456789012345");
  15 // Heart beat message header.
  16 var HEART_BEAT_HEADER = 'HEARTBEAT';
  17 var EXTERNAL_CLEAR_KEY_KEY_SYSTEM = "org.chromium.externalclearkey";
  18 // Note that his URL has been normalized from the one in clear_key_cdm.cc.
  19 var EXTERNAL_CLEAR_KEY_HEARTBEAT_URL =
  20     'http://test.externalclearkey.chromium.org/';
  21
  22 function isHeartbeatMessage(msg) {
  23   if (msg.length < HEART_BEAT_HEADER.length)
  24     return false;
  25   for (var i = 0; i < HEART_BEAT_HEADER.length; ++i) {
  26     if (String.fromCharCode(msg[i]) != HEART_BEAT_HEADER[i])
  27       return false;
  28   }
  29   return true;
  30 }
  31
  32 function loadEncryptedMediaFromURL(video) {
  33   return loadEncryptedMedia(video, mediaFile, keySystem, KEY, useMSE);
  34 }
  35
  36 function loadEncryptedMedia(video, mediaFile, keySystem, key, useMSE,
  37                             appendSourceCallbackFn) {
  38   var keyRequested = false;
  39   var sourceOpened = false;
  40   // Add properties to enable verification that events occurred.
  41   video.receivedKeyAdded = false;
  42   video.receivedHeartbeat = false;
  43   video.isHeartbeatExpected = keySystem === EXTERNAL_CLEAR_KEY_KEY_SYSTEM;
  44   video.receivedKeyMessage = false;
  45
  46   if (!(video && mediaFile && keySystem && key)) {
  47     failTest('Missing parameters in loadEncryptedMedia().');
  48     return;
  49   }
  50
  51   function onNeedKey(e) {
  52     if (keyRequested)
  53       return;
  54     keyRequested = true;
  55     console.log('onNeedKey', e);
  56     try {
  57       video.webkitGenerateKeyRequest(keySystem, e.initData);
  58     }
  59     catch(error) {
  60       setResultInTitle("Generate_Key_Request_Exception");
  61     }
  62   }
  63
  64   function onKeyAdded(e) {
  65     e.target.receivedKeyAdded = true;
  66   }
  67
  68   function onKeyMessage(e) {
  69     video.receivedKeyMessage = true;
  70     if (!e.keySystem) {
  71       failTest('keymessage without a keySystem: ' + e.keySystem);
  72       return;
  73     }
  74
  75     if (!e.sessionId) {
  76       failTest('keymessage without a sessionId: ' + e.sessionId);
  77       return;
  78     }
  79
  80     if (!e.message) {
  81       failTest('keymessage without a message: ' + e.message);
  82       return;
  83     }
  84
  85     if (isHeartbeatMessage(e.message)) {
  86       console.log('onKeyMessage - heartbeat', e);
  87       e.target.receivedHeartbeat = true;
  88       verifyHeartbeatMessage(e);
  89       return;
  90     }
  91
  92     // No tested key system returns defaultURL in for key request messages.
  93     if (e.defaultURL) {
  94       failTest('keymessage unexpectedly has defaultURL: ' + e.defaultURL);
  95       return;
  96     }
  97
  98     // keymessage in response to generateKeyRequest. Reply with key.
  99     console.log('onKeyMessage - key request', e);
 100     var initData = e.message;
 101     if (mediaType.indexOf('mp4') != -1)
 102       initData = KEY_ID; // Temporary hack for Clear Key in v0.1.
 103     video.webkitAddKey(keySystem, key, initData);
 104   }
 105
 106   function verifyHeartbeatMessage(e) {
 107     // Only External Clear Key sends a HEARTBEAT message.
 108     if (e.keySystem != EXTERNAL_CLEAR_KEY_KEY_SYSTEM) {
 109       failTest('Unexpected heartbeat from ' + e.keySystem);
 110       return;
 111     }
 112
 113     if (e.defaultURL != EXTERNAL_CLEAR_KEY_HEARTBEAT_URL) {
 114       failTest('Heartbeat message with unexpected defaultURL: ' + e.defaultURL);
 115       return;
 116     }
 117   }
 118
 119   video.addEventListener('webkitneedkey', onNeedKey);
 120   video.addEventListener('webkitkeymessage', onKeyMessage);
 121   video.addEventListener('webkitkeyerror', function() {
 122       setResultInTitle("KeyError");
 123   });
 124   video.addEventListener('webkitkeyadded', onKeyAdded);
 125   installTitleEventHandler(video, 'error');
 126
 127   if (useMSE) {
 128     var mediaSource = loadMediaSource(mediaFile, mediaType,
 129                                       appendSourceCallbackFn);
 130     video.src = window.URL.createObjectURL(mediaSource);
 131   } else {
 132     video.src = mediaFile;
 133   }
 134 }
 135
 136 function getInitDataFromKeyId(keyID) {
 137   var init_key_id = new Uint8Array(keyID.length);
 138   for(var i = 0; i < keyID.length; i++) {
 139     init_key_id[i] = keyID.charCodeAt(i);
 140   }
 141   return init_key_id;
 142 }