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      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 handling saving and restoring of per-host options.
      8  */
      9 
     10 'use strict';
     11 
     12 /** @suppress {duplicate} */
     13 var remoting = remoting || {};
     14 
     15 /** @type {Object} */
     16 remoting.HostSettings = {};
     17 
     18 /**
     19  * Load the settings for the specified host. Settings are returned as a
     20  * dictionary of (name, value) pairs.
     21  *
     22  * @param {string} hostId The host identifer for which to load options.
     23  * @param {function(Object):void} callback Callback to which the
     24  *     current settings for the host are passed. If there are no settings,
     25  *     then an empty dictionary is passed.
     26  * @return {void} Nothing.
     27  */
     28 remoting.HostSettings.load = function(hostId, callback) {
     29   /**
     30    * @param {Object} requestedHost
     31    * @param {Object} allHosts
     32    * @return {void} Nothing.
     33    */
     34   var onDone = function(requestedHost, allHosts) {
     35     callback(requestedHost);
     36   };
     37   remoting.HostSettings.loadInternal_(hostId, onDone);
     38 };
     39 
     40 /**
     41  * Save the settings for the specified hosts. Existing settings with the same
     42  * names will be overwritten; settings not currently saved will be created.
     43  *
     44  * @param {string} hostId The host identifer for which to save options.
     45  * @param {Object} options The options to save, expressed as a dictionary of
     46  *     (name, value) pairs.
     47  * @param {function():void=} opt_callback Optional completion callback.
     48  * @return {void} Nothing.
     49  */
     50 remoting.HostSettings.save = function(hostId, options, opt_callback) {
     51   /**
     52    * @param {Object} requestedHost
     53    * @param {Object} allHosts
     54    * @return {void} Nothing.
     55    */
     56   var onDone = function(requestedHost, allHosts) {
     57     for (var option in options) {
     58       requestedHost[option] = options[option];
     59     }
     60     allHosts[hostId] = requestedHost;
     61     var newSettings = {};
     62     newSettings[remoting.HostSettings.KEY_] = JSON.stringify(allHosts);
     63     chrome.storage.local.set(newSettings, opt_callback);
     64   };
     65   remoting.HostSettings.loadInternal_(hostId, onDone);
     66 };
     67 
     68 /**
     69  * Helper function for both load and save.
     70  *
     71  * @param {string} hostId The host identifer for which to load options.
     72  * @param {function(Object, Object):void} callback Callback to which the
     73  *     current settings for the specified host and for all hosts are passed.
     74  * @return {void} Nothing.
     75  */
     76 remoting.HostSettings.loadInternal_ = function(hostId, callback) {
     77   /**
     78    * @param {Object.<string>} allHosts The current options for all hosts.
     79    * @return {void} Nothing.
     80    */
     81   var onDone = function(allHosts) {
     82     var result = {};
     83     try {
     84       var hosts = allHosts[remoting.HostSettings.KEY_];
     85       if (hosts) {
     86         result = jsonParseSafe(hosts);
     87         if (typeof(result) != 'object') {
     88           console.error("Error loading host settings: Not an object");
     89           result = {};
     90         } else if (/** @type {Object} */ (result).hasOwnProperty(hostId) &&
     91                    typeof(result[hostId]) == 'object') {
     92           callback(result[hostId], result);
     93           return;
     94         }
     95       }
     96     } catch (err) {
     97       var typedErr = /** @type {*} */ (err);
     98       console.error('Error loading host settings:', typedErr);
     99     }
    100     callback({}, /** @type {Object} */ (result));
    101   };
    102   chrome.storage.local.get(remoting.HostSettings.KEY_, onDone);
    103 };
    104 
    105 /** @type {string} @private */
    106 remoting.HostSettings.KEY_ = 'remoting-host-options';