FIDO U2F component extension

chrome/browser/resources/cryptotoken/background.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.
+
+/**
+ * @fileoverview U2F gnubbyd background page
+ */
+
+'use strict';
+
+// Singleton tracking available devices.
+var gnubbies = new Gnubbies();
+llUsbGnubby.register(gnubbies);
+// Only include HID support if it's available in this browser.
+if (chrome.hid) {
+  llHidGnubby.register(gnubbies);
+}
+
+var GNUBBY_FACTORY = new UsbGnubbyFactory(gnubbies);
+var SIGN_HELPER_FACTORY = new UsbSignHelperFactory(GNUBBY_FACTORY);
+var ENROLL_HELPER_FACTORY = new UsbEnrollHelperFactory(GNUBBY_FACTORY);
+
+/**
+ * @param {boolean} toleratesMultipleResponses Whether the web page can handle
+ *     multiple responses given to its sendResponse callback.
+ * @param {Object} request
+ * @param {MessageSender} sender
+ * @param {Function} sendResponse
+ * @return {Closeable}
+ */
+function handleWebPageRequest(toleratesMultipleResponses, request, sender,
+    sendResponse) {
+  var enforceAppIdValid = true;
+  switch (request.type) {
+    case GnubbyMsgTypes.ENROLL_WEB_REQUEST:
+      return handleEnrollRequest(ENROLL_HELPER_FACTORY, sender, request,
+          enforceAppIdValid, sendResponse, toleratesMultipleResponses);
+
+    case GnubbyMsgTypes.SIGN_WEB_REQUEST:
+      return handleSignRequest(SIGN_HELPER_FACTORY, sender, request,
+          enforceAppIdValid, sendResponse, toleratesMultipleResponses);
+
+    default:
+      var response = formatWebPageResponse(
+          GnubbyMsgTypes.ENROLL_WEB_REPLY, GnubbyCodeTypes.BAD_REQUEST);
+      sendResponse(response);
+      return null;
+  }
+}
+
+// Message handler for requests coming from web pages.
+function messageHandler(toleratesMultipleResponses, request, sender,
+    sendResponse) {
+  console.log(UTIL_fmt('onMessageExternal listener: ' + request.type));
+  console.log(UTIL_fmt('request'));
+  console.log(request);
+  console.log(UTIL_fmt('sender'));
+  console.log(sender);
+
+  handleWebPageRequest(toleratesMultipleResponses, request, sender,
+      sendResponse);
+  return true;
+}
+
+// Listen to web pages.
+chrome.runtime.onMessageExternal.addListener(messageHandler.bind(null, false));
+
+// List to connection events, and wire up a message handler on the port.
+chrome.runtime.onConnectExternal.addListener(function(port) {
+  var closeable;
+  port.onMessage.addListener(function(request) {
+    var toleratesMultipleResponses = true;
+    closeable = handleWebPageRequest(toleratesMultipleResponses, request,
+        port.sender,
+        function(response) {
+          response['requestId'] = request['requestId'];
+          port.postMessage(response);
+        });
+  });
+  port.onDisconnect.addListener(function() {
+    if (closeable) {
+      closeable.close();
+    }
+  });
+});