Google Apps Script fetch feed item link

gistfile1.js

function fetchUrlfromRSS(url) {
  var cache = CacheService.getPublicCache(); // using Cache service to prevent too many urlfetch 
  var cached = cache.get(url);
  if (cached != null) { // if value in cache return it
    return cached;
  }
  // otherwise build urlfetch
  var options = {"method" : "get"};
  try {
    var response = UrlFetchApp.fetch(url , options);
    var doc = Xml.parse(response.getContentText(),true); // parse content as xml
      if (doc.rss.channel.item != undefined ){ // if item is defined get link
        // Note using item instead of item.link because urls appear to be slipping out of schema
        var res = doc.rss.channel.item.getText().replace(/^\s+|\s+$/g, '');  
        cache.put(url, res, 3600); // put result in cache for next time
        return res; 
      } 
    } catch (e){
      return "NONE";
    }
  return "NONE";
}