set google domain users as choices in a form

google.js

// see https://stackoverflow.com/questions/51025018/referenceerror-admindirectory-is-not-defined to activate AdminDirectory
// - resources > advanced google services > Admin Directory API > Activate
// - https://console.cloud.google.com/apis/api/admin.googleapis.com/overview?project=project-id-123456&authuser=1

function onOpen(e) {
  FormApp.getUi()
      .createAddonMenu()
      .addItem('Update users', 'setUsers')
      .addToUi();
}

function setUsers() {
  var emails = listActiveUsers("colisweb.com")
    .map(function(user) { return user.primaryEmail; });
  var form = FormApp.getActiveForm();
  updateForm(form, emails);
  return emails.length;
}

function updateForm(form, usersValues) {
  var items = form.getItems();
  var destination = items[0].asListItem();
  
  var choices = usersValues
    .filter(function(value) { return value != ""; })
    .map(function(value) { return destination.createChoice(value);})

  destination.setChoices(choices);
}

function listActiveUsers(domainName) {
  var now = new Date();
  var twoWeeksAgo = now.setDate(now.getDate() - 14);
  
  var users = AdminDirectory.Users.list({
      domain: domainName,
      orderBy: 'givenName',
      maxResults: 100
    })
    .users
    .filter(function(user) { return Date.parse(user.lastLoginTime) > twoWeeksAgo; }); 
  
  return users;
}

function logUsers(users) {
  if (users && users.length > 0) {
    Logger.log('Users:');
    for (i = 0; i < users.length; i++) {
      var user = users[i];
      Logger.log('%s (%s)', user.primaryEmail, user.name.fullName);
    }
  } else {
    Logger.log('No users found.');
  }
}

function transpose(a) {
  return a[0].map(function (_, c) { return a.map(function (r) { return r[c]; }); });
}