UserLogoutConfirm.php

<?php

declare (strict_types=1);
namespace Drupal\user\Form;

use Drupal\Core\Form\ConfirmFormBase;
use Drupal\Core\Form\FormStateInterface;
use Drupal\Core\Form\WorkspaceSafeFormInterface;
use Drupal\Core\StringTranslation\TranslatableMarkup;
use Drupal\Core\Url;

/**
 * Provides a confirmation form for user logout.
 */
class UserLogoutConfirm extends ConfirmFormBase implements WorkspaceSafeFormInterface {
    
    /**
     * {@inheritdoc}
     */
    public function getConfirmText() : TranslatableMarkup {
        return $this->t('Log out');
    }
    
    /**
     * {@inheritdoc}
     */
    public function getQuestion() : TranslatableMarkup {
        return $this->t('Are you sure you want to log out?');
    }
    
    /**
     * {@inheritdoc}
     */
    public function getCancelUrl() : Url {
        return new Url('<front>');
    }
    
    /**
     * {@inheritdoc}
     */
    public function getFormId() : string {
        return 'user_logout_confirm';
    }
    
    /**
     * {@inheritdoc}
     */
    public function submitForm(array &$form, FormStateInterface $form_state) : void {
        user_logout();
        $form_state->setRedirect('<front>');
    }

}