src/remoting/webapp/host_installer.js

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 /**
   6  * @fileoverview
   7  *
   8  * HostInstaller allows the caller to download the host binary and monitor the
   9  * install progress of the host by pinging the host periodically via native
  10  * messaging.
  11  *
  12  * To download the host and wait for install:
  13  *   var hostInstaller = new remoting.HostInstaller();
  14  *   hostInstaller.downloadAndWaitForInstall().then(function() {
  15  *      // Install has completed.
  16  *   }, function(){
  17  *      // Download has failed.
  18  *   })
  19  *
  20  * To stop listening to the install progress:
  21  *   hostInstaller.cancel();
  22  */
  23
  24 'use strict';
  25
  26 /** @suppress {duplicate} */
  27 var remoting = remoting || {};
  28
  29 /**
  30  * @constructor
  31  */
  32 remoting.HostInstaller = function() {
  33   /**
  34    * @type {Promise}
  35    * @private
  36    */
  37   this.downloadAndWaitForInstallPromise_ = null;
  38
  39   /**
  40    * @type {?number}
  41    * @private
  42    */
  43   this.checkInstallIntervalId_ = null;
  44 };
  45
  46 /**
  47  * @return {Promise}  The promise will resolve to a boolean value indicating
  48  *     whether the host is installed or not.
  49  */
  50 remoting.HostInstaller.prototype.isInstalled = function() {
  51   // Always do a fresh check as we don't get notified when the host is
  52   // uninstalled.
  53
  54   /** @param {function(*=):void} resolve */
  55   return new Promise(function(resolve) {
  56     // TODO(kelvinp): Use different native messaging ports for the Me2me host
  57     // vs It2MeHost.
  58     /** @type {chrome.runtime.Port} */
  59     var port =
  60         chrome.runtime.connectNative('com.google.chrome.remote_assistance');
  61
  62     function onMessage() {
  63       port.onDisconnect.removeListener(onDisconnected);
  64       port.onMessage.removeListener(onMessage);
  65       port.disconnect();
  66       resolve(true);
  67     }
  68
  69     function onDisconnected() {
  70       port.onDisconnect.removeListener(onDisconnected);
  71       port.onMessage.removeListener(onMessage);
  72       resolve(false);
  73     }
  74
  75     port.onDisconnect.addListener(onDisconnected);
  76     port.onMessage.addListener(onMessage);
  77     port.postMessage({type: 'hello'});
  78   });
  79 };
  80
  81 /**
  82  * @throws {Error}  Throws if there is no matching host binary for the current
  83  *     platform.
  84  */
  85 remoting.HostInstaller.prototype.download = function() {
  86   /** @type {Object.<string,string>} */
  87   var hostDownloadUrls = {
  88     'Win32' : 'http://dl.google.com/dl/edgedl/chrome-remote-desktop/' +
  89         'chromeremotedesktophost.msi',
  90     'Win64' : 'http://dl.google.com/dl/edgedl/chrome-remote-desktop/' +
  91         'chromeremotedesktophost.msi',
  92     'MacIntel' : 'https://dl.google.com/chrome-remote-desktop/' +
  93         'chromeremotedesktop.dmg',
  94     'Linux x86_64' : 'https://dl.google.com/linux/direct/' +
  95         'chrome-remote-desktop_current_amd64.deb',
  96     'Linux i386' : 'https://dl.google.com/linux/direct/' +
  97         'chrome-remote-desktop_current_i386.deb'
  98   };
  99
 100   var hostPackageUrl = hostDownloadUrls[navigator.platform];
 101   if (hostPackageUrl === undefined) {
 102     throw new Error(remoting.Error.CANCELLED);
 103   }
 104
 105   // Start downloading the package.
 106   if (base.isAppsV2()) {
 107     // TODO(jamiewalch): Use chrome.downloads when it is available to
 108     // apps v2 (http://crbug.com/174046)
 109     window.open(hostPackageUrl);
 110   } else {
 111     window.location = hostPackageUrl;
 112   }
 113 };
 114
 115 /** @return {Promise} */
 116 remoting.HostInstaller.prototype.downloadAndWaitForInstall = function() {
 117   /** @type {remoting.HostInstaller} */
 118   var that = this;
 119   /**
 120    * @type {number}
 121    * @const
 122    */
 123   var CHECK_INSTALL_INTERVAL_IN_MILLISECONDS = 1000;
 124
 125   /** @param {boolean} installed */
 126   return this.isInstalled().then(function(installed){
 127     if (installed) {
 128       return Promise.resolve(true);
 129     }
 130
 131     if (that.downloadAndWaitForInstallPromise_ === null) {
 132       that.downloadAndWaitForInstallPromise_ = new Promise(
 133         /** @param {Function} resolve */
 134         function(resolve){
 135           that.download();
 136           that.checkInstallIntervalId_ = window.setInterval(function() {
 137             /** @param {boolean} installed */
 138             that.isInstalled().then(function(installed) {
 139               if (installed) {
 140                 that.cancel();
 141                 resolve();
 142               }
 143             });
 144           }, CHECK_INSTALL_INTERVAL_IN_MILLISECONDS);
 145       });
 146     }
 147     return that.downloadAndWaitForInstallPromise_;
 148   });
 149 };
 150
 151 /**
 152  * Stops waiting for the host to be installed.
 153  * For example
 154  *   var promise = hostInstaller.downloadAndWaitForInstall();
 155  *   hostInstaller.cancel(); // This will prevent |promise| from fulfilling.
 156  */
 157 remoting.HostInstaller.prototype.cancel = function() {
 158   if (this.checkInstallIntervalId_ !== null) {
 159     window.clearInterval(this.checkInstallIntervalId_);
 160     this.checkInstallIntervalId_ = null;
 161   }
 162   this.downloadAndWaitForInstallPromise_ = null;
 163 };