class BanDelete

class BanDelete extends ConfirmFormBase {
    
    /**
     * The banned IP address.
     *
     * @var string
     */
    protected $banIp;
    
    /**
     * The IP manager.
     *
     * @var \Drupal\ban\BanIpManagerInterface
     */
    protected $ipManager;
    
    /**
     * Constructs a new BanDelete object.
     *
     * @param \Drupal\ban\BanIpManagerInterface $ip_manager
     *   The IP manager.
     */
    public function __construct(BanIpManagerInterface $ip_manager) {
        $this->ipManager = $ip_manager;
    }
    
    /**
     * {@inheritdoc}
     */
    public static function create(ContainerInterface $container) {
        return new static($container->get('ban.ip_manager'));
    }
    
    /**
     * {@inheritdoc}
     */
    public function getFormId() {
        return 'ban_ip_delete_form';
    }
    
    /**
     * {@inheritdoc}
     */
    public function getQuestion() {
        return $this->t('Are you sure you want to unblock %ip?', [
            '%ip' => $this->banIp,
        ]);
    }
    
    /**
     * {@inheritdoc}
     */
    public function getConfirmText() {
        return $this->t('Delete');
    }
    
    /**
     * {@inheritdoc}
     */
    public function getCancelUrl() {
        return new Url('ban.admin_page');
    }
    
    /**
     * {@inheritdoc}
     *
     * @param array $form
     *   A nested array form elements comprising the form.
     * @param \Drupal\Core\Form\FormStateInterface $form_state
     *   The current state of the form.
     * @param string $ban_id
     *   The IP address record ID to unban.
     */
    public function buildForm(array $form, FormStateInterface $form_state, $ban_id = '') {
        if (!($this->banIp = $this->ipManager
            ->findById($ban_id))) {
            throw new NotFoundHttpException();
        }
        return parent::buildForm($form, $form_state);
    }
    
    /**
     * {@inheritdoc}
     */
    public function submitForm(array &$form, FormStateInterface $form_state) {
        $this->ipManager
            ->unbanIp($this->banIp);
        $this->logger('user')
            ->notice('Deleted %ip', [
            '%ip' => $this->banIp,
        ]);
        $this->messenger()
            ->addStatus($this->t('The IP address %ip was deleted.', [
            '%ip' => $this->banIp,
        ]));
        $form_state->setRedirectUrl($this->getCancelUrl());
    }

}