Chatworkの投稿時にwebhookでこのスクリプトを呼び出し、投稿を任意のメールアドレスへ通知する

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var USER_ID = 'xxxxxxx';

var MAIL_TO = 'xxxxxxx@xxxxxxx';
var MAIL_FROM = 'xxxxxxx@xxxxxxx';
var MAIL_FROMNAME = 'mail sender name';
var MAIL_BCC = 'xxxxxxx@xxxxxxx';
var MAIL_SUBJECT = 'mail subject';

function doPost(e) {
  var json = JSON.parse(e.postData.contents);
  if (json.webhook_event.body.indexOf(USER_ID) != -1) {
    var message = '';
    message = json.webhook_event.body + "\n";
    sendMessage(message);
  }
}

function sendMessage(message) {
  var body = makeMailBody(message);
  sendMail(MAIL_SUBJECT, body);
}

// メール本文作成
function makeMailBody(message) {
  var body = '';
  body += "USER 様" + "\n";
  body += "\n";
  body += "チャットワークのwebhook設置のルームに以下の投稿があります。\n"
  body += "\n";
  body += "========================\n";
  body += message + "\n";
  body += "========================\n";
  body += "\n";
  body += "ご確認の程よろしくお願いいたします。\n"
  return body;
}

// メール送信
function sendMail(subject, body) {

  MailApp.sendEmail({
    to: MAIL_TO,
    bcc: MAIL_BCC,
    subject: subject,
    name: MAIL_FROMNAME,
    body: body,
  });
}

function test() {
  //Logger.log(SHEET.getName());
  sendMessage('test');
}