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// Copyright 2014 The Chromium Authors
// 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 GetModuleSystem = requireNative('v8_context').GetModuleSystem;
// TODO(sammc): Don't require extension. See http://crbug.com/235689.
var GetExtensionViews = requireNative('runtime').GetExtensionViews;
var WINDOW = {};
try {
WINDOW = window;
} catch (e) {
// Running in SW context.
// TODO(lazyboy): Synchronous access to background page is not possible from
// service worker context. Decide what we should do in this case for the class
// of APIs that require access to background page or window object
}
// 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 views = GetExtensionViews(-1, -1, 'BACKGROUND');
// GetExtensionViews() can return null if called from a context without an
// associated extension.
var backgroundPage = views && views[0] ? views[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(callback, response) {
if (callback) {
if (!response) {
callback();
return;
}
var entries = [];
var hasError = false;
var getEntryError = function(fileError) {
if (!hasError) {
hasError = true;
bindingUtil.runCallbackWithLastError(
'Error getting fileEntry, code: ' + fileError.code,
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) {
var extensionResult =
response.multiple ? entries : entries[0];
callback(extensionResult);
}
}
// 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;
bindingUtil.runCallbackWithLastError(
'Error getting fileEntry: ' + e.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('fileEntryBindingUtil')
.getFileBindingsForApi(apiName).bindFileEntryCallback;
var entryIdManager = backgroundPageModuleSystem.require('entryIdManager');
}
return {bindFileEntryCallback: bindFileEntryCallback,
entryIdManager: entryIdManager};
}
function getBindDirectoryEntryCallback() {
// Get the background page if one exists. Otherwise, default to the current
// window.
var views = GetExtensionViews(-1, -1, 'BACKGROUND');
// GetExtensionViews() can return null if called from a context without an
// associated extension.
var backgroundPage = views && views[0] ? views[0] : WINDOW;
// For packaged apps, 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) {
return function(callback, response) {
if (callback) {
if (!response) {
callback();
return;
}
var fileSystemId = response.fileSystemId;
var baseName = response.baseName;
var fs = GetIsolatedFileSystem(fileSystemId);
try {
fs.root.getDirectory(baseName, {}, callback, function(fileError) {
bindingUtil.runCallbackWithLastError(
'Error getting Entry, code: ' + fileError.code, callback);
});
} catch (e) {
bindingUtil.runCallbackWithLastError('Error: ' + e.stack, callback);
}
}
}
} else {
var backgroundPageModuleSystem = GetModuleSystem(backgroundPage);
// Force the runtime API to be loaded in the background page. Using
// backgroundPageModuleSystem.require('runtime') is insufficient as
// requireNative is only allowed while lazily loading an API.
backgroundPage.chrome.runtime;
return backgroundPageModuleSystem.require('fileEntryBindingUtil')
.getBindDirectoryEntryCallback();
}
}
exports.$set('getFileBindingsForApi', getFileBindingsForApi);
exports.$set('getBindDirectoryEntryCallback', getBindDirectoryEntryCallback);
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