chrome/renderer/resources/extensions/gcm_custom_bindings.js

   1 // Copyright 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 // Custom binding for the GCM API.
   6
   7 var binding = require('binding').Binding.create('gcm');
   8 var forEach = require('utils').forEach;
   9
  10 binding.registerCustomHook(function(bindingsAPI) {
  11   var apiFunctions = bindingsAPI.apiFunctions;
  12   var gcm = bindingsAPI.compiledApi;
  13
  14   apiFunctions.setUpdateArgumentsPostValidate(
  15     'send', function(message, callback) {
  16       // Validate message.data.
  17       var payloadSize = 0;
  18       forEach(message.data, function(property, value) {
  19         if (property.length == 0)
  20           throw new Error("One of data keys is empty.");
  21
  22         var lowerCasedProperty = property.toLowerCase();
  23         // Issue an error for forbidden prefixes of property names.
  24         if (lowerCasedProperty.indexOf("goog.") == 0 ||
  25             lowerCasedProperty.indexOf("google") == 0 ||
  26             property.indexOf("collapse_key") == 0) {
  27           throw new Error("Invalid data key: " + property);
  28         }
  29
  30         payloadSize += property.length + value.length;
  31       });
  32
  33       if (payloadSize > gcm.MAX_MESSAGE_SIZE)
  34         throw new Error("Payload exceeded allowed size limit. Payload size is: "
  35             + payloadSize);
  36
  37       if (payloadSize == 0)
  38         throw new Error("No data to send.");
  39
  40       return arguments;
  41     });
  42 });
  43
  44 exports.binding = binding.generate();