function magic(source, keys) {
  var result = {};
  var tmp = source.toString().substring(1, source.length-1);
  Logger.log(tmp);
  var arr = tmp.split(',');
  Logger.log(arr);
  if(arr && arr.length > 0) {
    arr.forEach(function(arg) {
      var param = arg.split(' ').join('').split('=');
      if(keys.indexOf(param[0]) > -1) {
          result[param[0]] = param[1];
      }
    });
  }