ContactController::contactSitePage

public ContactController::contactSitePage(ContactFormInterface $contact_form = NULL)

public function contactSitePage(ContactFormInterface $contact_form = NULL) {
  $config = $this->config('contact.settings');

  // Use the default form if no form has been passed.
  if (empty($contact_form)) {
    $contact_form = $this->entityManager()
      ->getStorage('contact_form')
      ->load($config->get('default_form'));
    // If there are no forms, do not display the form.
    if (empty($contact_form)) {
      if ($this->currentUser()->hasPermission('administer contact forms')) {
        drupal_set_message($this->t('The contact form has not been configured. <a href=":add">Add one or more forms</a> .', array(
          ':add' => $this->url('contact.form_add'))), 'error');
        return array();
      }
      else {
        throw new NotFoundHttpException();
      }
    }
  }

  $message = $this->entityManager()
    ->getStorage('contact_message')
    ->create(array(
      'contact_form' => $contact_form->id(),
    ));

  $form = $this->entityFormBuilder()->getForm($message);
  $form['#title'] = $contact_form->label();
  $form['#cache']['contexts'][] = 'user.permissions';
  $this->renderer->addCacheableDependency($form, $config);
  return $form;
}