Googleイメージ検索トップの抽出

gistfile1.s

function getTopImageUrl(query) {
  var url = 'http://ajax.googleapis.com/ajax/services/search/images?v=1.0&q=' + encodeURI(query);
  var response = UrlFetchApp.fetch(url);
  var json = response.getContentText();
  var object = Utilities.jsonParse(json);
  return object["responseData"]["results"][0]["unescapedUrl"];
}