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// Copyright (c) 2012 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.
// Custom binding for the Media Gallery API.
var binding = require('binding').Binding.create('mediaGalleries');
var blobNatives = requireNative('blob_natives');
var mediaGalleriesNatives = requireNative('mediaGalleries');
var blobsAwaitingMetadata = {};
var mediaGalleriesMetadata = {};
function createFileSystemObjectsAndUpdateMetadata(response) {
var result = [];
mediaGalleriesMetadata = {}; // Clear any previous metadata.
if (response) {
for (var i = 0; i < response.length; i++) {
var filesystem = mediaGalleriesNatives.GetMediaFileSystemObject(
response[i].fsid);
$Array.push(result, filesystem);
var metadata = response[i];
delete metadata.fsid;
mediaGalleriesMetadata[filesystem.name] = metadata;
}
}
return result;
}
binding.registerCustomHook(function(bindingsAPI, extensionId) {
var apiFunctions = bindingsAPI.apiFunctions;
// getMediaFileSystems and addUserSelectedFolder use a custom callback so that
// they can instantiate and return an array of file system objects.
apiFunctions.setCustomCallback('getMediaFileSystems',
function(name, request, callback, response) {
var result = createFileSystemObjectsAndUpdateMetadata(response);
if (callback)
callback(result);
});
apiFunctions.setCustomCallback('addUserSelectedFolder',
function(name, request, callback, response) {
var fileSystems = [];
var selectedFileSystemName = "";
if (response && 'mediaFileSystems' in response &&
'selectedFileSystemIndex' in response) {
fileSystems = createFileSystemObjectsAndUpdateMetadata(
response['mediaFileSystems']);
var selectedFileSystemIndex = response['selectedFileSystemIndex'];
if (selectedFileSystemIndex >= 0) {
selectedFileSystemName = fileSystems[selectedFileSystemIndex].name;
}
}
if (callback)
callback(fileSystems, selectedFileSystemName);
});
apiFunctions.setHandleRequest('getMediaFileSystemMetadata',
function(filesystem) {
if (filesystem && filesystem.name &&
filesystem.name in mediaGalleriesMetadata) {
return mediaGalleriesMetadata[filesystem.name];
}
return {
'name': '',
'galleryId': '',
'isRemovable': false,
'isMediaDevice': false,
'isAvailable': false,
};
});
apiFunctions.setUpdateArgumentsPostValidate('getMetadata',
function(mediaFile, options, callback) {
var blobUuid = blobNatives.GetBlobUuid(mediaFile)
// Store the blob in a global object to keep its refcount nonzero -- this
// prevents the object from being garbage collected before any metadata
// parsing gets to occur (see crbug.com/415792).
blobsAwaitingMetadata[blobUuid] = mediaFile;
return [blobUuid, options, callback];
});
apiFunctions.setCustomCallback('getMetadata',
function(name, request, callback, response) {
if (response && response.attachedImagesBlobInfo) {
for (var i = 0; i < response.attachedImagesBlobInfo.length; i++) {
var blobInfo = response.attachedImagesBlobInfo[i];
var blob = blobNatives.TakeBrowserProcessBlob(
blobInfo.blobUUID, blobInfo.type, blobInfo.size);
response.metadata.attachedImages.push(blob);
}
}
if (callback)
callback(response ? response.metadata : null);
// The UUID was in position 0 in the setUpdateArgumentsPostValidate
// function.
var uuid = request.args[0];
delete blobsAwaitingMetadata[uuid];
});
});
exports.binding = binding.generate();
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