DQL injection through sorting parameters blocked

<?php

// src/App/Sorting/Sorter.php

declare(strict_types=1);

namespace App\Sorting;

use Symfony\Component\HttpKernel\Exception\BadRequestHttpException;
use Sylius\Component\Grid\Data\DataSourceInterface;
use Sylius\Component\Grid\Definition\Grid;
use Sylius\Component\Grid\Parameters;
use Sylius\Component\Grid\Sorting\SorterInterface;

final class Sorter implements SorterInterface
{
    public function sort(DataSourceInterface $dataSource, Grid $grid, Parameters $parameters): void
    {
        $enabledFields = $grid->getFields();
        $expressionBuilder = $dataSource->getExpressionBuilder();

        $sorting = $parameters->get('sorting', $grid->getSorting());
        $this->validateSortingParams($sorting, $enabledFields);

        foreach ($sorting as $field => $order) {
            $this->validateFieldNames($field, $enabledFields);

            $gridField = $grid->getField($field);
            $property = $gridField->getSortable();

            if (null !== $property) {
                $expressionBuilder->addOrderBy($property, $order);
            }
        }
    }

    private function validateSortingParams(array $sorting, array $enabledFields): void
    {
        foreach (array_keys($enabledFields) as $key) {
            if (array_key_exists($key, $sorting) && !in_array($sorting[$key], ['asc', 'desc'])) {
                throw new BadRequestHttpException(sprintf('%s is not valid, use asc or desc instead.', $sorting[$key]));
            }
        }
    }

    private function validateFieldNames(string $fieldName, array $enabledFields): void
    {
        $enabledFieldsNames = array_keys($enabledFields);

        if (!in_array($fieldName, $enabledFieldsNames, true)) {
            throw new BadRequestHttpException(sprintf('%s is not valid field, did you mean one of these: %s?', $fieldName, implode(', ', $enabledFieldsNames)));
        }
    }
}