Implement ClearKey message format as JSON.

media/test/data/eme_player_js/utils.js

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Utils provide logging functions and other JS functions commonly used by the
 // app and media players.
 var Utils = new function() {
   this.titleChanged = false;
 };
 
@@ skipping 61 matching lines @@
         jwkSet += ',';
       jwkSet += arguments[i];
     }
     jwkSet += ']}';
     return jwkSet;
   }
 
   return Utils.convertToUint8Array(createJWKSet(createJWK(keyId, key)));
 };
 
+Utils.extractFirstLicenseKey = function(message) {
+  // Decodes data (Uint8Array) from base64 string.
+  // TODO(jrummell): Update once the EME spec is updated to say base64url
+  // encoding.
+  function base64Decode(data) {
+    return atob(data);
+  }
+
+  function convertToString(data) {
+    return String.fromCharCode.apply(null, Utils.convertToUint8Array(data));
+  }
+
+  try {
+    var json = JSON.parse(convertToString(message));
+    // Decode the first element of 'kids', return it as an Uint8Array.
+    return Utils.convertToUint8Array(base64Decode(json.kids[0]));
+  } catch (error) {
+    // Not valid JSON, so return message untouched as Uint8Array.
+    return Utils.convertToUint8Array(message);
+  }
+}
+
 Utils.documentLog = function(log, success, time) {
   if (!docLogs)
     return;
   time = time || Utils.getCurrentTimeString();
   var timeLog = '<span style="color: green">' + time + '</span>';
   var logColor = !success ? 'red' : 'black'; // default is true.
   log = '<span style="color: "' + logColor + '>' + log + '</span>';
   docLogs.innerHTML = timeLog + ' - ' + log + '<br>' + docLogs.innerHTML;
 };
 
@@ skipping 55 matching lines @@
   var hex_str = '';
   for (var i = 0; i < uintArray.length; i++) {
     var hex = uintArray[i].toString(16);
     if (hex.length == 1)
       hex = '0' + hex;
     hex_str += hex;
   }
   return hex_str;
 };
 
-Utils.getInitDataFromMessage = function(message, mediaType) {
-  var initData = Utils.convertToUint8Array(message.message);
+Utils.getInitDataFromMessage = function(message, mediaType, decodeJSONMessage) {
+  var initData;
   if (mediaType.indexOf('mp4') != -1) {
     // Temporary hack for Clear Key in v0.1.
     // If content uses mp4, then message.message is PSSH data. Instead of
     // parsing that data we hard code the initData.
     initData = Utils.convertToUint8Array(KEY_ID);
+  } else if (decodeJSONMessage) {
+    initData = Utils.extractFirstLicenseKey(message.message);
+  } else {
+    initData = Utils.convertToUint8Array(message.message);
   }
   return initData;
 };
 
 Utils.hasPrefix = function(msg, prefix) {
   var message = String.fromCharCode.apply(null, msg);
   return message.substring(0, prefix.length) == prefix;
 };
 
 Utils.installTitleEventHandler = function(element, event) {
@@ skipping 67 matching lines @@
   var time = Utils.getCurrentTimeString();
   // Log to document.
   Utils.documentLog(arguments[0], time);
   // Log to JS console.
   var logString = time + ' - ';
   for (var i = 0; i < arguments.length; i++) {
     logString += ' ' + arguments[i];
   }
   console.log(logString);
 };