Função para reduzir url com a API do google

gistfile1.txt

function shorten_url(url,callback) {
  var XHR = Titanium.Network.createHTTPClient({
    onload: function () {
      try {
        shorturl = JSON.parse(this.responseText);
        shorturl = shorturl.id;
      } catch(e) {
        shorturl = false;
      }

      if (typeof(callback)=='function') {
        callback(shorturl,url);
      }

      return shorturl.id;
    },

    onerror: function(e) {
      if (typeof(callback)=='function') {
        callback(false);
      }

      return false;
    },
    timeout: 8000,
  });
  XHR.open("POST", "https://www.googleapis.com/urlshortener/v1/url");
  XHR.setRequestHeader('Content-Type', 'application/json');
  XHR.send('{"longUrl": "'+url+'"}');
}