| // 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. |
| |
| var fileSystemNatives = requireNative('file_system_natives'); |
| var GetIsolatedFileSystem = fileSystemNatives.GetIsolatedFileSystem; |
| var sendRequest = require('sendRequest'); |
| var lastError = require('lastError'); |
| var GetModuleSystem = requireNative('v8_context').GetModuleSystem; |
| // TODO(sammc): Don't require extension. See http://crbug.com/235689. |
| var GetExtensionViews = requireNative('runtime').GetExtensionViews; |
| |
| // For a given |apiName|, generates object with two elements that are used |
| // in file system relayed APIs: |
| // * 'bindFileEntryCallback' function that provides mapping between JS objects |
| // into actual FileEntry|DirectoryEntry objects. |
| // * 'entryIdManager' object that implements methods for keeping the tracks of |
| // previously saved file entries. |
| function getFileBindingsForApi(apiName) { |
| // Fallback to using the current window if no background page is running. |
| var backgroundPage = GetExtensionViews(-1, -1, 'BACKGROUND')[0] || window; |
| var backgroundPageModuleSystem = GetModuleSystem(backgroundPage); |
| |
| // All windows use the bindFileEntryCallback from the background page so their |
| // FileEntry objects have the background page's context as their own. This |
| // allows them to be used from other windows (including the background page) |
| // after the original window is closed. |
| if (window == backgroundPage) { |
| var bindFileEntryCallback = function(functionName, apiFunctions) { |
| apiFunctions.setCustomCallback(functionName, |
| function(name, request, callback, response) { |
| if (callback) { |
| if (!response) { |
| callback(); |
| return; |
| } |
| |
| var entries = []; |
| var hasError = false; |
| |
| var getEntryError = function(fileError) { |
| if (!hasError) { |
| hasError = true; |
| lastError.run( |
| apiName + '.' + functionName, |
| 'Error getting fileEntry, code: ' + fileError.code, |
| request.stack, |
| callback); |
| } |
| } |
| |
| // Loop through the response entries and asynchronously get the |
| // FileEntry for each. We use hasError to ensure that only the first |
| // error is reported. Note that an error can occur either during the |
| // loop or in the asynchronous error callback to getFile. |
| $Array.forEach(response.entries, function(entry) { |
| if (hasError) |
| return; |
| var fileSystemId = entry.fileSystemId; |
| var baseName = entry.baseName; |
| var id = entry.id; |
| var fs = GetIsolatedFileSystem(fileSystemId); |
| |
| try { |
| var getEntryCallback = function(fileEntry) { |
| if (hasError) |
| return; |
| entryIdManager.registerEntry(id, fileEntry); |
| entries.push(fileEntry); |
| // Once all entries are ready, pass them to the callback. In the |
| // event of an error, this condition will never be satisfied so |
| // the callback will not be called with any entries. |
| if (entries.length == response.entries.length) { |
| if (response.multiple) { |
| sendRequest.safeCallbackApply( |
| apiName + '.' + functionName, request, callback, |
| [entries]); |
| } else { |
| sendRequest.safeCallbackApply( |
| apiName + '.' + functionName, request, callback, |
| [entries[0]]); |
| } |
| } |
| } |
| // TODO(koz): fs.root.getFile() makes a trip to the browser |
| // process, but it might be possible avoid that by calling |
| // WebDOMFileSystem::createV8Entry(). |
| if (entry.isDirectory) { |
| fs.root.getDirectory(baseName, {}, getEntryCallback, |
| getEntryError); |
| } else { |
| fs.root.getFile(baseName, {}, getEntryCallback, getEntryError); |
| } |
| } catch (e) { |
| if (!hasError) { |
| hasError = true; |
| lastError.run(apiName + '.' + functionName, |
| 'Error getting fileEntry: ' + e.stack, |
| request.stack, |
| callback); |
| } |
| } |
| }); |
| } |
| }); |
| }; |
| var entryIdManager = require('entryIdManager'); |
| } else { |
| // Force the fileSystem API to be loaded in the background page. Using |
| // backgroundPageModuleSystem.require('fileSystem') is insufficient as |
| // requireNative is only allowed while lazily loading an API. |
| backgroundPage.chrome.fileSystem; |
| var bindFileEntryCallback = backgroundPageModuleSystem.require( |
| apiName).bindFileEntryCallback; |
| var entryIdManager = backgroundPageModuleSystem.require('entryIdManager'); |
| } |
| return {bindFileEntryCallback: bindFileEntryCallback, |
| entryIdManager: entryIdManager}; |
| } |
| |
| exports.$set('getFileBindingsForApi', getFileBindingsForApi); |