Additional methods for chrome.logPrivate API

chrome/renderer/resources/extensions/file_entry_binding_util.js

+// Copyright (c) 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, '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, response) {
+        if (request.callback && response) {
+          var callback = request.callback;
+          request.callback = null;
+
+          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.getFileBindingsForApi = getFileBindingsForApi;