remoting/webapp/host_list.js

   1 // Copyright (c) 2012 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  * Class representing the host-list portion of the home screen UI.
   8  */
   9
  10 'use strict';
  11
  12 /** @suppress {duplicate} */
  13 var remoting = remoting || {};
  14
  15 /**
  16  * Create a host list consisting of the specified HTML elements, which should
  17  * have a common parent that contains only host-list UI as it will be hidden
  18  * if the host-list is empty.
  19  *
  20  * @constructor
  21  * @param {Element} table The HTML <div> to contain host-list.
  22  * @param {Element} noHosts The HTML <div> containing the "no hosts" message.
  23  * @param {Element} errorMsg The HTML <div> to display error messages.
  24  * @param {Element} errorButton The HTML <button> to display the error
  25  *     resolution action.
  26  * @param {HTMLElement} loadingIndicator The HTML <span> to update while the
  27  *     host list is being loaded. The first element of this span should be
  28  *     the reload button.
  29  */
  30 remoting.HostList = function(table, noHosts, errorMsg, errorButton,
  31                              loadingIndicator) {
  32   /**
  33    * @type {Element}
  34    * @private
  35    */
  36   this.table_ = table;
  37   /**
  38    * @type {Element}
  39    * @private
  40    * TODO(jamiewalch): This should be doable using CSS's sibling selector,
  41    * but it doesn't work right now (crbug.com/135050).
  42    */
  43   this.noHosts_ = noHosts;
  44   /**
  45    * @type {Element}
  46    * @private
  47    */
  48   this.errorMsg_ = errorMsg;
  49   /**
  50    * @type {Element}
  51    * @private
  52    */
  53   this.errorButton_ = errorButton;
  54   /**
  55    * @type {HTMLElement}
  56    * @private
  57    */
  58   this.loadingIndicator_ = loadingIndicator;
  59   /**
  60    * @type {Array.<remoting.HostTableEntry>}
  61    * @private
  62    */
  63   this.hostTableEntries_ = [];
  64   /**
  65    * @type {Array.<remoting.Host>}
  66    * @private
  67    */
  68   this.hosts_ = [];
  69   /**
  70    * @type {string}
  71    * @private
  72    */
  73   this.lastError_ = '';
  74   /**
  75    * @type {remoting.Host?}
  76    * @private
  77    */
  78   this.localHost_ = null;
  79   /**
  80    * @type {remoting.HostController.State}
  81    * @private
  82    */
  83   this.localHostState_ = remoting.HostController.State.NOT_IMPLEMENTED;
  84   /**
  85    * @type {number}
  86    * @private
  87    */
  88   this.webappMajorVersion_ = parseInt(chrome.runtime.getManifest().version, 10);
  89
  90   this.errorButton_.addEventListener('click',
  91                                      this.onErrorClick_.bind(this),
  92                                      false);
  93   var reloadButton = this.loadingIndicator_.firstElementChild;
  94   /** @type {remoting.HostList} */
  95   var that = this;
  96   /** @param {Event} event */
  97   function refresh(event) {
  98     event.preventDefault();
  99     that.refresh(that.display.bind(that));
 100   };
 101   reloadButton.addEventListener('click', refresh, false);
 102 };
 103
 104 /**
 105  * Load the host-list asynchronously from local storage.
 106  *
 107  * @param {function():void} onDone Completion callback.
 108  */
 109 remoting.HostList.prototype.load = function(onDone) {
 110   // Load the cache of the last host-list, if present.
 111   /** @type {remoting.HostList} */
 112   var that = this;
 113   /** @param {Object.<string>} items */
 114   var storeHostList = function(items) {
 115     if (items[remoting.HostList.HOSTS_KEY]) {
 116       var cached = jsonParseSafe(items[remoting.HostList.HOSTS_KEY]);
 117       if (cached) {
 118         that.hosts_ = /** @type {Array} */ cached;
 119       } else {
 120         console.error('Invalid value for ' + remoting.HostList.HOSTS_KEY);
 121       }
 122     }
 123     onDone();
 124   };
 125   chrome.storage.local.get(remoting.HostList.HOSTS_KEY, storeHostList);
 126 };
 127
 128 /**
 129  * Search the host list for a host with the specified id.
 130  *
 131  * @param {string} hostId The unique id of the host.
 132  * @return {remoting.Host?} The host, if any.
 133  */
 134 remoting.HostList.prototype.getHostForId = function(hostId) {
 135   for (var i = 0; i < this.hosts_.length; ++i) {
 136     if (this.hosts_[i].hostId == hostId) {
 137       return this.hosts_[i];
 138     }
 139   }
 140   return null;
 141 };
 142
 143 /**
 144  * Get the host id corresponding to the specified host name.
 145  *
 146  * @param {string} hostName The name of the host.
 147  * @return {string?} The host id, if a host with the given name exists.
 148  */
 149 remoting.HostList.prototype.getHostIdForName = function(hostName) {
 150   for (var i = 0; i < this.hosts_.length; ++i) {
 151     if (this.hosts_[i].hostName == hostName) {
 152       return this.hosts_[i].hostId;
 153     }
 154   }
 155   return null;
 156 };
 157
 158 /**
 159  * Query the Remoting Directory for the user's list of hosts.
 160  *
 161  * @param {function(boolean):void} onDone Callback invoked with true on success
 162  *     or false on failure.
 163  * @return {void} Nothing.
 164  */
 165 remoting.HostList.prototype.refresh = function(onDone) {
 166   this.loadingIndicator_.classList.add('loading');
 167   /** @param {XMLHttpRequest} xhr The response from the server. */
 168   var parseHostListResponse = this.parseHostListResponse_.bind(this, onDone);
 169   /** @type {remoting.HostList} */
 170   var that = this;
 171   /** @param {string} token The OAuth2 token. */
 172   var getHosts = function(token) {
 173     var headers = { 'Authorization': 'OAuth ' + token };
 174     remoting.xhr.get(
 175         remoting.settings.DIRECTORY_API_BASE_URL + '/@me/hosts',
 176         parseHostListResponse, '', headers);
 177   };
 178   /** @param {remoting.Error} error */
 179   var onError = function(error) {
 180     that.lastError_ = error;
 181     onDone(false);
 182   };
 183   remoting.identity.callWithToken(getHosts, onError);
 184 };
 185
 186 /**
 187  * Handle the results of the host list request.  A success response will
 188  * include a JSON-encoded list of host descriptions, which we display if we're
 189  * able to successfully parse it.
 190  *
 191  * @param {function(boolean):void} onDone The callback passed to |refresh|.
 192  * @param {XMLHttpRequest} xhr The XHR object for the host list request.
 193  * @return {void} Nothing.
 194  * @private
 195  */
 196 remoting.HostList.prototype.parseHostListResponse_ = function(onDone, xhr) {
 197   this.lastError_ = '';
 198   try {
 199     if (xhr.status == 200) {
 200       var response =
 201           /** @type {{data: {items: Array}}} */ jsonParseSafe(xhr.responseText);
 202       if (response && response.data) {
 203         if (response.data.items) {
 204           this.hosts_ = response.data.items;
 205           /**
 206            * @param {remoting.Host} a
 207            * @param {remoting.Host} b
 208            */
 209           var cmp = function(a, b) {
 210             if (a.status < b.status) {
 211               return 1;
 212             } else if (b.status < a.status) {
 213               return -1;
 214             }
 215             return 0;
 216           };
 217           this.hosts_ = /** @type {Array} */ this.hosts_.sort(cmp);
 218         } else {
 219           this.hosts_ = [];
 220         }
 221       } else {
 222         this.lastError_ = remoting.Error.UNEXPECTED;
 223         console.error('Invalid "hosts" response from server.');
 224       }
 225     } else {
 226       // Some other error.
 227       console.error('Bad status on host list query: ', xhr);
 228       if (xhr.status == 0) {
 229         this.lastError_ = remoting.Error.NETWORK_FAILURE;
 230       } else if (xhr.status == 401) {
 231         this.lastError_ = remoting.Error.AUTHENTICATION_FAILED;
 232       } else if (xhr.status == 502 || xhr.status == 503) {
 233         this.lastError_ = remoting.Error.SERVICE_UNAVAILABLE;
 234       } else {
 235         this.lastError_ = remoting.Error.UNEXPECTED;
 236       }
 237     }
 238   } catch (er) {
 239     var typed_er = /** @type {Object} */ (er);
 240     console.error('Error processing response: ', xhr, typed_er);
 241     this.lastError_ = remoting.Error.UNEXPECTED;
 242   }
 243   this.save_();
 244   this.loadingIndicator_.classList.remove('loading');
 245   onDone(this.lastError_ == '');
 246 };
 247
 248 /**
 249  * Display the list of hosts or error condition.
 250  *
 251  * @return {void} Nothing.
 252  */
 253 remoting.HostList.prototype.display = function() {
 254   this.table_.innerText = '';
 255   this.errorMsg_.innerText = '';
 256   this.hostTableEntries_ = [];
 257
 258   var noHostsRegistered = (this.hosts_.length == 0);
 259   this.table_.hidden = noHostsRegistered;
 260   this.noHosts_.hidden = !noHostsRegistered;
 261
 262   if (this.lastError_ != '') {
 263     l10n.localizeElementFromTag(this.errorMsg_, this.lastError_);
 264     if (this.lastError_ == remoting.Error.AUTHENTICATION_FAILED) {
 265       l10n.localizeElementFromTag(this.errorButton_,
 266                                   /*i18n-content*/'SIGN_IN_BUTTON');
 267     } else {
 268       l10n.localizeElementFromTag(this.errorButton_,
 269                                   /*i18n-content*/'RETRY');
 270     }
 271   } else {
 272     for (var i = 0; i < this.hosts_.length; ++i) {
 273       /** @type {remoting.Host} */
 274       var host = this.hosts_[i];
 275       // Validate the entry to make sure it has all the fields we expect and is
 276       // not the local host (which is displayed separately). NB: if the host has
 277       // never sent a heartbeat, then there will be no jabberId.
 278       if (host.hostName && host.hostId && host.status && host.publicKey &&
 279           (!this.localHost_ || host.hostId != this.localHost_.hostId)) {
 280         var hostTableEntry = new remoting.HostTableEntry(
 281             host, this.webappMajorVersion_,
 282             this.renameHost_.bind(this), this.deleteHost_.bind(this));
 283         hostTableEntry.createDom();
 284         this.hostTableEntries_[i] = hostTableEntry;
 285         this.table_.appendChild(hostTableEntry.tableRow);
 286       }
 287     }
 288   }
 289
 290   this.errorMsg_.parentNode.hidden = (this.lastError_ == '');
 291
 292   // The local host cannot be stopped or started if the host controller is not
 293   // implemented for this platform. Additionally, it cannot be started if there
 294   // is an error (in many error states, the start operation will fail anyway,
 295   // but even if it succeeds, the chance of a related but hard-to-diagnose
 296   // future error is high).
 297   var state = this.localHostState_;
 298   var enabled = (state == remoting.HostController.State.STARTING) ||
 299       (state == remoting.HostController.State.STARTED);
 300   var canChangeLocalHostState =
 301       (state != remoting.HostController.State.NOT_IMPLEMENTED) &&
 302       (enabled || this.lastError_ == '');
 303
 304   remoting.updateModalUi(enabled ? 'enabled' : 'disabled', 'data-daemon-state');
 305   var element = document.getElementById('daemon-control');
 306   element.hidden = !canChangeLocalHostState;
 307   element = document.getElementById('host-list-empty-hosting-supported');
 308   element.hidden = !canChangeLocalHostState;
 309   element = document.getElementById('host-list-empty-hosting-unsupported');
 310   element.hidden = canChangeLocalHostState;
 311 };
 312
 313 /**
 314  * Remove a host from the list, and deregister it.
 315  * @param {remoting.HostTableEntry} hostTableEntry The host to be removed.
 316  * @return {void} Nothing.
 317  * @private
 318  */
 319 remoting.HostList.prototype.deleteHost_ = function(hostTableEntry) {
 320   this.table_.removeChild(hostTableEntry.tableRow);
 321   var index = this.hostTableEntries_.indexOf(hostTableEntry);
 322   if (index != -1) {
 323     this.hostTableEntries_.splice(index, 1);
 324   }
 325   remoting.HostList.unregisterHostById(hostTableEntry.host.hostId);
 326 };
 327
 328 /**
 329  * Prepare a host for renaming by replacing its name with an edit box.
 330  * @param {remoting.HostTableEntry} hostTableEntry The host to be renamed.
 331  * @return {void} Nothing.
 332  * @private
 333  */
 334 remoting.HostList.prototype.renameHost_ = function(hostTableEntry) {
 335   for (var i = 0; i < this.hosts_.length; ++i) {
 336     if (this.hosts_[i].hostId == hostTableEntry.host.hostId) {
 337       this.hosts_[i].hostName = hostTableEntry.host.hostName;
 338       break;
 339     }
 340   }
 341   this.save_();
 342
 343   /** @param {string?} token */
 344   var renameHost = function(token) {
 345     if (token) {
 346       var headers = {
 347         'Authorization': 'OAuth ' + token,
 348         'Content-type' : 'application/json; charset=UTF-8'
 349       };
 350       var newHostDetails = { data: {
 351         hostId: hostTableEntry.host.hostId,
 352         hostName: hostTableEntry.host.hostName,
 353         publicKey: hostTableEntry.host.publicKey
 354       } };
 355       remoting.xhr.put(
 356           remoting.settings.DIRECTORY_API_BASE_URL + '/@me/hosts/' +
 357           hostTableEntry.host.hostId,
 358           function(xhr) {},
 359           JSON.stringify(newHostDetails),
 360           headers);
 361     } else {
 362       console.error('Could not rename host. Authentication failure.');
 363     }
 364   }
 365   remoting.identity.callWithToken(renameHost, remoting.showErrorMessage);
 366 };
 367
 368 /**
 369  * Unregister a host.
 370  * @param {string} hostId The id of the host to be removed.
 371  * @return {void} Nothing.
 372  */
 373 remoting.HostList.unregisterHostById = function(hostId) {
 374   /** @param {string} token The OAuth2 token. */
 375   var deleteHost = function(token) {
 376     var headers = { 'Authorization': 'OAuth ' + token };
 377     remoting.xhr.remove(
 378         remoting.settings.DIRECTORY_API_BASE_URL + '/@me/hosts/' + hostId,
 379         function() {}, '', headers);
 380   }
 381   remoting.identity.callWithToken(deleteHost, remoting.showErrorMessage);
 382 };
 383
 384 /**
 385  * Set tool-tips for the 'connect' action. We can't just set this on the
 386  * parent element because the button has no tool-tip, and therefore would
 387  * inherit connectStr.
 388  *
 389  * @return {void} Nothing.
 390  * @private
 391  */
 392 remoting.HostList.prototype.setTooltips_ = function() {
 393   var connectStr = '';
 394   if (this.localHost_) {
 395     chrome.i18n.getMessage(/*i18n-content*/'TOOLTIP_CONNECT',
 396                            this.localHost_.hostName);
 397   }
 398   document.getElementById('this-host-name').title = connectStr;
 399   document.getElementById('this-host-icon').title = connectStr;
 400 };
 401
 402 /**
 403  * Set the state of the local host and localHostId if any.
 404  *
 405  * @param {remoting.HostController.State} state State of the local host.
 406  * @param {string?} hostId ID of the local host, or null.
 407  * @return {void} Nothing.
 408  */
 409 remoting.HostList.prototype.setLocalHostStateAndId = function(state, hostId) {
 410   this.localHostState_ = state;
 411   this.setLocalHost_(hostId ? this.getHostForId(hostId) : null);
 412 }
 413
 414 /**
 415  * Set the host object that corresponds to the local computer, if any.
 416  *
 417  * @param {remoting.Host?} host The host, or null if not registered.
 418  * @return {void} Nothing.
 419  * @private
 420  */
 421 remoting.HostList.prototype.setLocalHost_ = function(host) {
 422   this.localHost_ = host;
 423   this.setTooltips_();
 424   /** @type {remoting.HostList} */
 425   var that = this;
 426   if (host) {
 427     /** @param {remoting.HostTableEntry} host */
 428     var renameHost = function(host) {
 429       that.renameHost_(host);
 430       that.setTooltips_();
 431     };
 432     if (!this.localHostTableEntry_) {
 433       /** @type {remoting.HostTableEntry} @private */
 434       this.localHostTableEntry_ = new remoting.HostTableEntry(
 435           host, this.webappMajorVersion_, renameHost);
 436       this.localHostTableEntry_.init(
 437           document.getElementById('this-host-connect'),
 438           document.getElementById('this-host-warning'),
 439           document.getElementById('this-host-name'),
 440           document.getElementById('this-host-rename'));
 441     } else {
 442       // TODO(jamiewalch): This is hack to prevent multiple click handlers being
 443       // registered for the same DOM elements if this method is called more than
 444       // once. A better solution would be to let HostTable create the daemon row
 445       // like it creates the rows for non-local hosts.
 446       this.localHostTableEntry_.host = host;
 447     }
 448   } else {
 449     this.localHostTableEntry_ = null;
 450   }
 451 }
 452
 453 /**
 454  * Called by the HostControlled after the local host has been started.
 455  *
 456  * @param {string} hostName Host name.
 457  * @param {string} hostId ID of the local host.
 458  * @param {string} publicKey Public key.
 459  * @return {void} Nothing.
 460  */
 461 remoting.HostList.prototype.onLocalHostStarted = function(
 462     hostName, hostId, publicKey) {
 463   // Create a dummy remoting.Host instance to represent the local host.
 464   // Refreshing the list is no good in general, because the directory
 465   // information won't be in sync for several seconds. We don't know the
 466   // host JID, but it can be missing from the cache with no ill effects.
 467   // It will be refreshed if the user tries to connect to the local host,
 468   // and we hope that the directory will have been updated by that point.
 469   var localHost = new remoting.Host();
 470   localHost.hostName = hostName;
 471   // Provide a version number to avoid warning about this dummy host being
 472   // out-of-date.
 473   localHost.hostVersion = String(this.webappMajorVersion_) + ".x"
 474   localHost.hostId = hostId;
 475   localHost.publicKey = publicKey;
 476   localHost.status = 'ONLINE';
 477   this.hosts_.push(localHost);
 478   this.save_();
 479   this.setLocalHost_(localHost);
 480 };
 481
 482 /**
 483  * Called when the user clicks the button next to the error message. The action
 484  * depends on the error.
 485  *
 486  * @private
 487  */
 488 remoting.HostList.prototype.onErrorClick_ = function() {
 489   if (this.lastError_ == remoting.Error.AUTHENTICATION_FAILED) {
 490     remoting.oauth2.doAuthRedirect();
 491   } else {
 492     this.refresh(remoting.updateLocalHostState);
 493   }
 494 };
 495
 496 /**
 497  * Save the host list to local storage.
 498  */
 499 remoting.HostList.prototype.save_ = function() {
 500   var items = {};
 501   items[remoting.HostList.HOSTS_KEY] = JSON.stringify(this.hosts_);
 502   chrome.storage.local.set(items);
 503 };
 504
 505 /**
 506  * Key name under which Me2Me hosts are cached.
 507  */
 508 remoting.HostList.HOSTS_KEY = 'me2me-cached-hosts';
 509
 510 /** @type {remoting.HostList} */
 511 remoting.hostList = null;