FilterFormatAccessControlHandler.php

<?php

namespace Drupal\filter;

use Drupal\Core\Access\AccessResult;
use Drupal\Core\Entity\EntityAccessControlHandler;
use Drupal\Core\Entity\EntityInterface;
use Drupal\Core\Session\AccountInterface;

/**
 * Defines the access control handler for the filter format entity type.
 *
 * @see \Drupal\filter\Entity\FilterFormat
 */
class FilterFormatAccessControlHandler extends EntityAccessControlHandler {
    
    /**
     * {@inheritdoc}
     */
    protected function checkAccess(EntityInterface $filter_format, $operation, AccountInterface $account) {
        
        /** @var \Drupal\filter\FilterFormatInterface $filter_format */
        // All users are allowed to use the fallback filter.
        if ($operation == 'use') {
            if ($filter_format->isFallbackFormat()) {
                return AccessResult::allowed();
            }
            else {
                return AccessResult::allowedIfHasPermission($account, $filter_format->getPermissionName());
            }
        }
        // The fallback format may not be disabled.
        if ($operation == 'disable' && $filter_format->isFallbackFormat()) {
            return AccessResult::forbidden();
        }
        // We do not allow filter formats to be deleted through the UI, because that
        // would render any content that uses them unusable.
        if ($operation == 'delete') {
            return AccessResult::forbidden();
        }
        if (in_array($operation, [
            'disable',
            'update',
            'view',
            'enable',
        ])) {
            return parent::checkAccess($filter_format, $operation, $account);
        }
        // No opinion.
        return AccessResult::neutral();
    }

}