Create proper object types when loading host cache.

remoting/webapp/base/js/host.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.
 
 /**
  * @fileoverview
  * The deserialized form of the chromoting host as returned by Apiary.
  */
 
 'use strict';
@@ skipping 35 matching lines @@
   this.tokenUrlPatterns = [];
   /** @type {string} */
   this.updatedTime = '';
   /** @type {string} */
   this.hostOfflineReason = '';
   /** @type {remoting.HostOptions} */
   this.options = new remoting.HostOptions(hostId);
 };
 
 /**
+ * Create a typed Host instance from an untyped Object.
+ *
+ * @param {Object} object
+ * @return {remoting.Host}
+ */
+remoting.Host.fromObject = function(object) {
+  try {
+    var result = new remoting.Host(base.assertString(object.hostId));
+    result.hostName = base.assertString(object.hostName);
+    result.status = base.assertString(object.status);
+    result.jabberId = base.assertString(object.jabberId);
+    result.publicKey = base.assertString(object.publicKey);
+    result.hostVersion = base.assertString(object.hostVersion);
+    result.hostOs = base.assertNumber(object.hostOs);
+    result.hostOsVersion = base.assertString(object.hostOsVersion);
+    result.tokenUrlPatterns = base.assertArray(object.tokenUrlPatterns);
+    result.updatedTime = base.assertString(object.updatedTime);
+    result.hostOfflineReason = base.assertString(object.hostOfflineReason);
+    result.options = remoting.HostOptions.fromObject(
+        base.assertObject(object.options), base.assertString(object.hostId));
+    return result;
+  } catch (e) {
+    console.error(e);
+    return null;
+  }
+};
+
+/**
  * Determine whether a host needs to be manually updated. This is the case if
  * the host's major version number is more than 2 lower than that of the web-
  * app (a difference of 2 is tolerated due to the different update mechanisms
  * and to handle cases where we may skip releasing a version) and if the host is
  * on-line (off-line hosts are not expected to auto-update).
  *
  * @param {remoting.Host} host The host information from the directory.
  * @param {string|number} webappVersion The version number of the web-app, in
  *     either dotted-decimal notation notation, or directly represented by the
  *     major version.
  * @return {boolean} True if the host is on-line but out-of-date.
  */
 remoting.Host.needsUpdate = function(host, webappVersion) {
   if (host.status != 'ONLINE') {
     return false;
   }
   var hostMajorVersion = parseInt(host.hostVersion, 10);
   if (isNaN(hostMajorVersion)) {
     // Host versions 26 and higher include the version number in heartbeats,
     // so if it's missing then the host is at most version 25.
     hostMajorVersion = 25;
   }
   return (parseInt(webappVersion, 10) - hostMajorVersion) > 2;
 };
 
 })();