ServiceAccount_calendar_attempt

function stack(event_id,target_email) {
  getService(target_email).reset();
  var service = getService(target_email);

  if (service.hasAccess()) {
    Logger.log("service has access");
    // Calendar.Events.move(calendarId, event_id, target_email);
  } else {
    Logger.log("no access to" + target_email + ">" + CLIENT_EMAIL + ":" + PRIVATE_KEY);
  }
}

function getService(user) {
  return OAuth2.createService('List users')
  .setTokenUrl('https://accounts.google.com/o/oauth2/token')
  .setPrivateKey(PRIVATE_KEY)
  .setIssuer(CLIENT_EMAIL)
  .setSubject(user)
  .setPropertyStore(PropertiesService.getScriptProperties())
  .setParam('access_type', 'offline')
  .setScope("https://www.googleapis.com/calendar/v3/calendars/calendarId/events/eventId");
}