remoting/webapp/crd/js/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 (function() {
  30
  31 /**
  32  * @constructor
  33  */
  34 remoting.HostInstaller = function() {
  35   /** @private {Promise} */
  36   this.downloadAndWaitForInstallPromise_ = null;
  37
  38   /** @private {?number} */
  39   this.checkInstallIntervalId_ = null;
  40 };
  41
  42 /**
  43  * @return {Promise}  The promise will resolve to a boolean value indicating
  44  *     whether the host is installed or not.
  45  */
  46 remoting.HostInstaller.isInstalled = function() {
  47   // Always do a fresh check as we don't get notified when the host is
  48   // uninstalled.
  49
  50   return new Promise(
  51       /** @param {function(*=):void} resolve */
  52       function(resolve) {
  53         // TODO(kelvinp): Use different native messaging ports for the Me2me
  54         // host vs It2MeHost.
  55         /** @type {Port} */
  56         var port =
  57             chrome.runtime.connectNative('com.google.chrome.remote_assistance');
  58
  59         function onMessage() {
  60           port.onDisconnect.removeListener(onDisconnected);
  61           port.onMessage.removeListener(onMessage);
  62           port.disconnect();
  63           resolve(true);
  64         }
  65
  66         function onDisconnected() {
  67           port.onDisconnect.removeListener(onDisconnected);
  68           port.onMessage.removeListener(onMessage);
  69           resolve(false);
  70         }
  71
  72         port.onDisconnect.addListener(onDisconnected);
  73         port.onMessage.addListener(onMessage);
  74         port.postMessage({type: 'hello'});
  75       });
  76 };
  77
  78 /** @type {Object<string>} */
  79 var HOST_DOWNLOAD_URLS = {
  80   'Win32': 'http://dl.google.com/dl/edgedl/chrome-remote-desktop/' +
  81                'chromeremotedesktophost.msi',
  82   'Win64': 'http://dl.google.com/dl/edgedl/chrome-remote-desktop/' +
  83                'chromeremotedesktophost.msi',
  84   'MacIntel': 'https://dl.google.com/chrome-remote-desktop/' +
  85                   'chromeremotedesktop.dmg',
  86   'Linux x86_64': 'https://dl.google.com/linux/direct/' +
  87                       'chrome-remote-desktop_current_amd64.deb',
  88   'Linux i386': 'https://dl.google.com/linux/direct/' +
  89                     'chrome-remote-desktop_current_i386.deb',
  90   'Linux i686': 'https://dl.google.com/linux/direct/' +
  91                     'chrome-remote-desktop_current_i386.deb'
  92 };
  93
  94 /**
  95  * Returns true if the host is installable on the current platform.
  96  * @returns {boolean}
  97  */
  98 remoting.HostInstaller.canInstall = function() {
  99   return !!HOST_DOWNLOAD_URLS[navigator.platform];
 100 };
 101
 102 /**
 103  * @throws {Error}  Throws if there is no matching host binary for the current
 104  *     platform.
 105  */
 106 remoting.HostInstaller.prototype.download = function() {
 107   var hostPackageUrl = HOST_DOWNLOAD_URLS[navigator.platform];
 108   if (hostPackageUrl === undefined) {
 109     console.error("Tried to install host on " + navigator.platform);
 110     throw new Error(remoting.Error.unexpected());
 111   }
 112
 113   // Start downloading the package.
 114   if (base.isAppsV2()) {
 115     // TODO(jamiewalch): Use chrome.downloads when it is available to
 116     // apps v2 (http://crbug.com/174046)
 117     window.open(hostPackageUrl);
 118   } else {
 119     window.location = hostPackageUrl;
 120   }
 121 };
 122
 123 /** @return {Promise} */
 124 remoting.HostInstaller.prototype.downloadAndWaitForInstall = function() {
 125   /** @type {remoting.HostInstaller} */
 126   var that = this;
 127   /**
 128    * @type {number}
 129    * @const
 130    */
 131   var CHECK_INSTALL_INTERVAL_IN_MILLISECONDS = 1000;
 132
 133   return remoting.HostInstaller.isInstalled().then(
 134       /** @param {boolean} installed */
 135       function(installed){
 136         if (installed) {
 137           return Promise.resolve(true);
 138         }
 139
 140         if (that.downloadAndWaitForInstallPromise_ === null) {
 141           that.downloadAndWaitForInstallPromise_ = new Promise(
 142               /** @param {Function} resolve */
 143               function(resolve){
 144                 that.download();
 145                 that.checkInstallIntervalId_ = window.setInterval(function() {
 146                   remoting.HostInstaller.isInstalled().then(
 147                       /** @param {boolean} installed */
 148                       function(installed) {
 149                         if (installed) {
 150                           that.cancel();
 151                           resolve();
 152                         }
 153                       });
 154                 }, CHECK_INSTALL_INTERVAL_IN_MILLISECONDS);
 155               });
 156         }
 157         return that.downloadAndWaitForInstallPromise_;
 158       });
 159 };
 160
 161 /**
 162  * Stops waiting for the host to be installed.
 163  * For example
 164  *   var promise = hostInstaller.downloadAndWaitForInstall();
 165  *   hostInstaller.cancel(); // This will prevent |promise| from fulfilling.
 166  */
 167 remoting.HostInstaller.prototype.cancel = function() {
 168   if (this.checkInstallIntervalId_ !== null) {
 169     window.clearInterval(this.checkInstallIntervalId_);
 170     this.checkInstallIntervalId_ = null;
 171   }
 172   this.downloadAndWaitForInstallPromise_ = null;
 173 };
 174
 175 })();