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 blobsAwaitingMetadata = {};
  12 var mediaGalleriesMetadata = {};
  13
  14 function createFileSystemObjectsAndUpdateMetadata(response) {
  15   var result = [];
  16   mediaGalleriesMetadata = {};  // Clear any previous metadata.
  17   if (response) {
  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, callback, response) {
  38     var result = createFileSystemObjectsAndUpdateMetadata(response);
  39     if (callback)
  40       callback(result);
  41   });
  42
  43   apiFunctions.setCustomCallback('addScanResults',
  44       function(name, request, callback, response) {
  45     var result = createFileSystemObjectsAndUpdateMetadata(response);
  46     if (callback)
  47       callback(result);
  48   });
  49
  50   apiFunctions.setCustomCallback('addUserSelectedFolder',
  51       function(name, request, callback, response) {
  52     var fileSystems = [];
  53     var selectedFileSystemName = "";
  54     if (response && 'mediaFileSystems' in response &&
  55         'selectedFileSystemIndex' in response) {
  56       fileSystems = createFileSystemObjectsAndUpdateMetadata(
  57           response['mediaFileSystems']);
  58       var selectedFileSystemIndex = response['selectedFileSystemIndex'];
  59       if (selectedFileSystemIndex >= 0) {
  60         selectedFileSystemName = fileSystems[selectedFileSystemIndex].name;
  61       }
  62     }
  63     if (callback)
  64       callback(fileSystems, selectedFileSystemName);
  65   });
  66
  67   apiFunctions.setCustomCallback('dropPermissionForMediaFileSystem',
  68       function(name, request, callback, response) {
  69     var galleryId = response;
  70
  71     if (galleryId) {
  72       for (var key in mediaGalleriesMetadata) {
  73         if (mediaGalleriesMetadata[key].galleryId == galleryId) {
  74           delete mediaGalleriesMetadata[key];
  75           break;
  76         }
  77       }
  78     }
  79     if (callback)
  80       callback();
  81   });
  82
  83   apiFunctions.setHandleRequest('getMediaFileSystemMetadata',
  84                                 function(filesystem) {
  85     if (filesystem && filesystem.name &&
  86         filesystem.name in mediaGalleriesMetadata) {
  87       return mediaGalleriesMetadata[filesystem.name];
  88     }
  89     return {
  90       'name': '',
  91       'galleryId': '',
  92       'isRemovable': false,
  93       'isMediaDevice': false,
  94       'isAvailable': false,
  95     };
  96   });
  97
  98   apiFunctions.setUpdateArgumentsPostValidate('getMetadata',
  99       function(mediaFile, options, callback) {
 100     var blobUuid = blobNatives.GetBlobUuid(mediaFile)
 101     // Store the blob in a global object to keep its refcount nonzero -- this
 102     // prevents the object from being garbage collected before any metadata
 103     // parsing gets to occur (see crbug.com/415792).
 104     blobsAwaitingMetadata[blobUuid] = mediaFile;
 105     return [blobUuid, options, callback];
 106   });
 107
 108   apiFunctions.setCustomCallback('getMetadata',
 109       function(name, request, callback, response) {
 110     if (response.attachedImagesBlobInfo) {
 111       for (var i = 0; i < response.attachedImagesBlobInfo.length; i++) {
 112         var blobInfo = response.attachedImagesBlobInfo[i];
 113         var blob = blobNatives.TakeBrowserProcessBlob(
 114             blobInfo.blobUUID, blobInfo.type, blobInfo.size);
 115         response.metadata.attachedImages.push(blob);
 116       }
 117     }
 118
 119     if (callback)
 120       callback(response.metadata);
 121
 122     // The UUID was in position 0 in the setUpdateArgumentsPostValidate
 123     // function.
 124     var uuid = request.args[0];
 125     delete blobsAwaitingMetadata[uuid];
 126   });
 127 });
 128
 129 exports.binding = binding.generate();