[Webapp Refactor] Implements Me2MeConnectFlow as an object.

remoting/webapp/crd/js/crd_connect.js

 // 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.
 
 /**
  * @fileoverview
  * Functions related to the 'client screen' for Chromoting.
  */
 
 'use strict';
 
 /** @suppress {duplicate} */
 var remoting = remoting || {};
 
 /**
  * Initiate an IT2Me connection.
  */
 remoting.connectIT2Me = function() {
   var connector = remoting.app.getSessionConnector();
   var accessCode = document.getElementById('access-code-entry').value;
   remoting.setMode(remoting.AppMode.CLIENT_CONNECTING);
-  remoting.It2MeConnectFlow.start(connector, accessCode).
-    catch(function(/** !remoting.Error */ reason){
+  remoting.It2MeConnectFlow.start(connector, accessCode).catch(
+    function(/** remoting.Error */ reason){
       var errorDiv = document.getElementById('connect-error-message');
       l10n.localizeElementFromTag(errorDiv, reason.getTag());
       remoting.setMode(remoting.AppMode.CLIENT_CONNECT_FAILED_IT2ME);
   });
 };
 
 /**
  * Entry-point for Me2Me connections, handling showing of the host-upgrade nag
  * dialog if necessary.
  *
  * @param {string} hostId The unique id of the host.
  * @return {void} Nothing.
  */
 remoting.connectMe2Me = function(hostId) {
   var host = remoting.hostList.getHostForId(hostId);
-  if (!host) {
-    remoting.app.onError(new remoting.Error(
-        remoting.Error.Tag.HOST_IS_OFFLINE));
-    return;
-  }
-  var webappVersion = chrome.runtime.getManifest().version;
-  var needsUpdateDialog = new remoting.HostNeedsUpdateDialog(
-      document.getElementById('host-needs-update-dialog'), host);
-
-  needsUpdateDialog.showIfNecessary(webappVersion).then(function() {
-    remoting.connectMe2MeHostVersionAcknowledged_(host);
-  }).catch(function(/** remoting.Error */ error) {
-    if (error.hasTag(remoting.Error.Tag.CANCELLED)) {
-      remoting.setMode(remoting.AppMode.HOME);
-    }
-  });
-};
-
-/**
- * Shows PIN entry screen localized to include the host name, and registers
- * a host-specific one-shot event handler for the form submission.
- *
- * @param {remoting.Host} host The Me2Me host to which to connect.
- * @return {void} Nothing.
- */
-remoting.connectMe2MeHostVersionAcknowledged_ = function(host) {
-  /** @type {remoting.SessionConnector} */
   var connector = remoting.app.getSessionConnector();
-  remoting.setMode(remoting.AppMode.CLIENT_CONNECTING);
-
-  /**
-   * @param {string} tokenUrl Token-issue URL received from the host.
-   * @param {string} hostPublicKey Host public key (DER and Base64 encoded).
-   * @param {string} scope OAuth scope to request the token for.
-   * @param {function(string, string):void} onThirdPartyTokenFetched Callback.
-   */
-  var fetchThirdPartyToken = function(
-      tokenUrl, hostPublicKey, scope, onThirdPartyTokenFetched) {
-    var thirdPartyTokenFetcher = new remoting.ThirdPartyTokenFetcher(
-        tokenUrl, hostPublicKey, scope, host.tokenUrlPatterns,
-        onThirdPartyTokenFetched);
-    thirdPartyTokenFetcher.fetchToken();
-  };
-
-  /**
-   * @param {boolean} supportsPairing
-   * @param {function(string):void} onPinFetched
-   */
-  var requestPin = function(supportsPairing, onPinFetched) {
-    var pinDialog =
-        new remoting.PinDialog(document.getElementById('pin-dialog'), host);
-    pinDialog.show(supportsPairing).then(function(/** string */ pin) {
-      onPinFetched(pin);
-      /** @type {boolean} */
-      remoting.pairingRequested = pinDialog.pairingRequested();
-    });
-  };
-
-  /** @param {Object} settings */
-  var connectMe2MeHostSettingsRetrieved = function(settings) {
-    /** @type {string} */
-    var clientId = '';
-    /** @type {string} */
-    var sharedSecret = '';
-    var pairingInfo = /** @type {Object} */ (settings['pairingInfo']);
-    if (pairingInfo) {
-      clientId = /** @type {string} */ (pairingInfo['clientId']);
-      sharedSecret = /** @type {string} */ (pairingInfo['sharedSecret']);
-    }
-    connector.connectMe2Me(host, requestPin, fetchThirdPartyToken,
-                                 clientId, sharedSecret);
-  }
-
-  remoting.HostSettings.load(host.hostId, connectMe2MeHostSettingsRetrieved);
-};
+  var flow = new remoting.Me2MeConnectFlow(connector, host);
+  flow.start();
+};