chrome/renderer/resources/extensions/media_galleries_custom_bindings.js

   1 // Copyright (c) 2012 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 Media Gallery API.
   6
   7 var binding = require('binding').Binding.create('mediaGalleries');
   8 var blobNatives = requireNative('blob_natives');
   9 var mediaGalleriesNatives = requireNative('mediaGalleries');
  10
  11 var mediaGalleriesMetadata = {};
  12
  13 function createFileSystemObjectsAndUpdateMetadata(response) {
  14   var result = null;
  15   mediaGalleriesMetadata = {};  // Clear any previous metadata.
  16   if (response) {
  17     result = [];
  18     for (var i = 0; i < response.length; i++) {
  19       var filesystem = mediaGalleriesNatives.GetMediaFileSystemObject(
  20           response[i].fsid);
  21       $Array.push(result, filesystem);
  22       var metadata = response[i];
  23       delete metadata.fsid;
  24       mediaGalleriesMetadata[filesystem.name] = metadata;
  25     }
  26   }
  27   return result;
  28 }
  29
  30 binding.registerCustomHook(function(bindingsAPI, extensionId) {
  31   var apiFunctions = bindingsAPI.apiFunctions;
  32
  33   // getMediaFileSystems, addUserSelectedFolder, and addScanResults use a
  34   // custom callback so that they can instantiate and return an array of file
  35   // system objects.
  36   apiFunctions.setCustomCallback('getMediaFileSystems',
  37                                  function(name, request, response) {
  38     var result = createFileSystemObjectsAndUpdateMetadata(response);
  39     if (request.callback)
  40       request.callback(result);
  41     request.callback = null;
  42   });
  43
  44   apiFunctions.setCustomCallback('addScanResults',
  45                                  function(name, request, response) {
  46     var result = createFileSystemObjectsAndUpdateMetadata(response);
  47     if (request.callback)
  48       request.callback(result);
  49     request.callback = null;
  50   });
  51
  52   apiFunctions.setCustomCallback('addUserSelectedFolder',
  53                                  function(name, request, response) {
  54     var fileSystems = [];
  55     var selectedFileSystemName = "";
  56     if (response && 'mediaFileSystems' in response &&
  57         'selectedFileSystemIndex' in response) {
  58       fileSystems = createFileSystemObjectsAndUpdateMetadata(
  59           response['mediaFileSystems']);
  60       var selectedFileSystemIndex = response['selectedFileSystemIndex'];
  61       if (selectedFileSystemIndex >= 0) {
  62         selectedFileSystemName = fileSystems[selectedFileSystemIndex].name;
  63       }
  64     }
  65     if (request.callback)
  66       request.callback(fileSystems, selectedFileSystemName);
  67     request.callback = null;
  68   });
  69
  70   apiFunctions.setHandleRequest('getMediaFileSystemMetadata',
  71                                 function(filesystem) {
  72     if (filesystem && filesystem.name &&
  73         mediaGalleriesMetadata[filesystem.name]) {
  74       return mediaGalleriesMetadata[filesystem.name];
  75     }
  76     return {};
  77   });
  78
  79   apiFunctions.setUpdateArgumentsPostValidate('getMetadata',
  80       function(mediaFile, options, callback) {
  81     var blobUuid = blobNatives.GetBlobUuid(mediaFile)
  82     return [blobUuid, options, callback];
  83   });
  84 });
  85
  86 exports.binding = binding.generate();