Download the host components when user tries to enable Me2Me host.

remoting/webapp/host_setup_dialog.js

 // Copyright (c) 2012 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.
 
 'use strict';
 
 /** @suppress {duplicate} */
 var remoting = remoting || {};
 
 /**
  * @param {Array.<remoting.HostSetupFlow.State>} sequence Sequence of
  *     steps for the flow.
  * @constructor
  */
 remoting.HostSetupFlow = function(sequence) {
   this.sequence_ = sequence;
   this.currentStep_ = 0;
   this.state_ = sequence[0];
   this.pin = '';
   this.consent = false;
 };
 
 /** @enum {number} */
 remoting.HostSetupFlow.State = {
   NONE: 0,
 
   // Dialog states.
   ASK_PIN: 1,
 
-  // Used on Mac OS X to prompt the user to manually install a .dmg package.
+  // Prompts the user to install the host package.
   INSTALL_HOST: 2,
 
   // Processing states.
   STARTING_HOST: 3,
   UPDATING_PIN: 4,
   STOPPING_HOST: 5,
 
   // Done states.
   HOST_STARTED: 6,
   UPDATED_PIN: 7,
@@ skipping 175 matching lines @@
   this.usageStats_.hidden = false;
   this.usageStatsCheckbox_.checked = false;
 
   // Prevent user from ticking the box until the current consent status is
   // known.
   this.usageStatsCheckbox_.disabled = true;
 
   this.hostController_.getConsent(onGetConsent, onError);
 
   var flow = [
+      remoting.HostSetupFlow.State.INSTALL_HOST,
       remoting.HostSetupFlow.State.ASK_PIN,
       remoting.HostSetupFlow.State.STARTING_HOST,
       remoting.HostSetupFlow.State.HOST_STARTED];
 
   var installed =
       state != remoting.HostController.State.NOT_INSTALLED &&
       state != remoting.HostController.State.INSTALLING;
 
-  if (navigator.platform.indexOf('Mac') != -1 && !installed) {
-    flow.unshift(remoting.HostSetupFlow.State.INSTALL_HOST);
+  // Skip the installation step when the host is already installed or when using
+  // NPAPI plugin on Windows (because on Windows the plugin takes care of
+  // installation).
+  if (installed || (navigator.platform == 'Win32' &&
+                    this.hostController_.usingNpapiPlugin())) {
+    flow.shift();
   }
 
   this.startNewFlow_(flow);
 };
 
 /**
  * Show the dialog in order to change the PIN associated with a running daemon.
  *
  * @return {void} Nothing.
  */
@@ skipping 72 matching lines @@
     remoting.setMode(remoting.AppMode.HOST_SETUP_ERROR);
   }
 
   var state = this.flow_.getState();
   if (state == remoting.HostSetupFlow.State.NONE) {
     this.hide();
   } else if (state == remoting.HostSetupFlow.State.ASK_PIN) {
     remoting.setMode(remoting.AppMode.HOST_SETUP_ASK_PIN);
   } else if (state == remoting.HostSetupFlow.State.INSTALL_HOST) {
     remoting.setMode(remoting.AppMode.HOST_SETUP_INSTALL);
-    window.location =
-        'https://dl.google.com/chrome-remote-desktop/chromeremotedesktop.dmg';
+    this.installHost_();
   } else if (state == remoting.HostSetupFlow.State.STARTING_HOST) {
     showProcessingMessage(/*i18n-content*/'HOST_SETUP_STARTING');
     this.startHost_();
   } else if (state == remoting.HostSetupFlow.State.UPDATING_PIN) {
     showProcessingMessage(/*i18n-content*/'HOST_SETUP_UPDATING_PIN');
     this.updatePin_();
   } else if (state == remoting.HostSetupFlow.State.STOPPING_HOST) {
     showProcessingMessage(/*i18n-content*/'HOST_SETUP_STOPPING');
     this.stopHost_();
   } else if (state == remoting.HostSetupFlow.State.HOST_STARTED) {
@@ skipping 10 matching lines @@
   } else if (state == remoting.HostSetupFlow.State.START_HOST_FAILED) {
     showErrorMessage(/*i18n-content*/'HOST_SETUP_HOST_FAILED');
   } else if (state == remoting.HostSetupFlow.State.UPDATE_PIN_FAILED) {
     showErrorMessage(/*i18n-content*/'HOST_SETUP_UPDATE_PIN_FAILED');
   } else if (state == remoting.HostSetupFlow.State.STOP_HOST_FAILED) {
     showErrorMessage(/*i18n-content*/'HOST_SETUP_STOP_FAILED');
   }
 };
 
 /**
+ * Installs Host component.
+ */
+remoting.HostSetupDialog.prototype.installHost_ = function() {
+  var hostPackageUrl = '';
+  switch (navigator.platform) {
+    case 'Win32':
+      hostPackageUrl = 'http://dl.google.com/dl/edgedl/chrome-remote-desktop/chromeremotedesktophost.msi';
+      break;
+    case 'MacIntel':
+      hostPackageUrl = 'https://dl.google.com/chrome-remote-desktop/chromeremotedesktop.dmg';
+      break;
+    case 'Linux x86_64':
+      hostPackageUrl = 'https://dl.google.com/linux/direct/chrome-remote-desktop_current_amd64.deb';
+      break;
+    case 'Linux i386':
+      hostPackageUrl = 'https://dl.google.com/linux/direct/chrome-remote-desktop_current_i386.deb';
+      break;
+    default:
+      // We never expect to get in this state. Host controls should not be shown
+      // on unsupported platform.
+      this.flow_.switchToErrorState(remoting.Error.UNEXPECTED);
+      this.updateState_();
+      return;
+  }
+
+  // Start downloading the package.
+  window.location = hostPackageUrl;
+}
+
+/**
  * Registers and starts the host.
  */
 remoting.HostSetupDialog.prototype.startHost_ = function() {
   /** @type {remoting.HostSetupDialog} */
   var that = this;
   /** @type {remoting.HostSetupFlow} */
   var flow = this.flow_;
 
   /** @return {boolean} */
   function isFlowActive() {
@@ skipping 194 matching lines @@
 
 /**
  * @return {void} Nothing.
  */
 remoting.HostSetupDialog.prototype.onInstallDialogRetry = function() {
   remoting.setMode(remoting.AppMode.HOST_SETUP_INSTALL);
 };
 
 /** @type {remoting.HostSetupDialog} */
 remoting.hostSetupDialog = null;