examples/app/feed-viewer/app/lib/FeedValidator.js

   1 Ext.define('FV.lib.FeedValidator', {
   2     singleton: true,
   3
   4     /**
   5      * @cfg {String} url The url to validate feeds on
   6      */
   7     url: 'feed-proxy.php',
   8
   9     /**
  10      * Validates a given feed's formating by fetching it and ensuring it is well formed
  11      * @param {FV.model.Feed} feed The feed to validate
  12      */
  13     validate: function(feed, options) {
  14         options = options || {};
  15
  16         Ext.applyIf(options, {
  17             scope: this,
  18             success: Ext.emptyFn,
  19             failure: Ext.emptyFn
  20         });
  21
  22         Ext.Ajax.request({
  23             url: this.url,
  24             params: {
  25                 feed: feed.get('url')
  26             },
  27             scope: this,
  28             success: function(response) {
  29                 if (this.checkResponse(response, feed)) {
  30                     options.success.call(options.scope, feed);
  31                 }
  32             },
  33             failure: function() {
  34                 options.failure.call(options.scope);
  35             }
  36         });
  37     },
  38
  39     /**
  40      * @private
  41      * Validates that a response contains a well-formed feed
  42      * @param {Object} response The response object
  43      */
  44     checkResponse: function(response, feed) {
  45         var dq  = Ext.DomQuery,
  46             url = feed.get('url'),
  47             xml, channel, title;
  48
  49         try {
  50             xml = response.responseXML;
  51             channel = xml.getElementsByTagName('channel')[0];
  52
  53             if (channel) {
  54                 title = dq.selectValue('title', channel, url);
  55                 return true;
  56             }
  57         } catch(e) {
  58         }
  59         return false;
  60     }
  61 });