ClearCacheBlock.php

<?php

namespace Drupal\system\Plugin\Block;

use Drupal\Core\Access\AccessResult;
use Drupal\Core\Access\AccessResultInterface;
use Drupal\Core\Block\Attribute\Block;
use Drupal\Core\Block\BlockBase;
use Drupal\Core\Form\FormBuilderInterface;
use Drupal\Core\Plugin\ContainerFactoryPluginInterface;
use Drupal\Core\Session\AccountInterface;
use Drupal\Core\StringTranslation\TranslatableMarkup;
use Drupal\system\Form\ClearCacheForm;
use Symfony\Component\DependencyInjection\ContainerInterface;

/**
 * Provides a block to display 'Clear cache' elements.
 */
class ClearCacheBlock extends BlockBase implements ContainerFactoryPluginInterface {
    
    /**
     * Creates a ClearCacheBlock instance.
     *
     * @param array $configuration
     *   A configuration array containing information about the plugin instance.
     * @param string $plugin_id
     *   The plugin_id for the plugin instance.
     * @param mixed $plugin_definition
     *   The plugin implementation definition.
     * @param \Drupal\Core\Form\FormBuilderInterface $formBuilder
     *   The form builder.
     */
    public function __construct(array $configuration, $plugin_id, $plugin_definition, FormBuilderInterface $formBuilder) {
        parent::__construct($configuration, $plugin_id, $plugin_definition);
    }
    
    /**
     * {@inheritdoc}
     */
    public static function create(ContainerInterface $container, array $configuration, $plugin_id, $plugin_definition) : static {
        return new static($configuration, $plugin_id, $plugin_definition, $container->get('form_builder'));
    }
    
    /**
     * {@inheritdoc}
     */
    public function build() : array {
        return $this->formBuilder
            ->getForm(ClearCacheForm::class);
    }
    
    /**
     * {@inheritdoc}
     */
    public function blockAccess(AccountInterface $account) : AccessResultInterface {
        return AccessResult::allowedIfHasPermission($account, 'administer site configuration');
    }

}