ds-site/Classes/Frontend/RssFeed/SitemapDataProvider.php

<?php

declare(strict_types=1);

/*
 * Copyright (C) 2021 Daniel Siepmann <coding@daniel-siepmann.de>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301, USA.
 */

namespace DanielSiepmann\DsSite\Frontend\RssFeed;

use Psr\Http\Message\ServerRequestInterface;
use TYPO3\CMS\Core\Database\Connection;
use TYPO3\CMS\Core\Database\ConnectionPool;
use TYPO3\CMS\Core\Database\Query\QueryBuilder;
use TYPO3\CMS\Core\Utility\GeneralUtility;
use TYPO3\CMS\Frontend\ContentObject\ContentObjectRenderer;
use TYPO3\CMS\Seo\XmlSitemap\RecordsXmlSitemapDataProvider;

/**
 * Provides dynamic for additionalWhere,
 * to only list pages for current requested category.
 */
class SitemapDataProvider extends RecordsXmlSitemapDataProvider
{
    public function __construct(
        ServerRequestInterface $request,
        string $key,
        array $config = [],
        ContentObjectRenderer $cObj = null
    ) {
        $categoryUid = intval($request->getQueryParams()['category_uid'] ?? 0);
        if ($categoryUid > 0) {
            $pageUids = $this->getPageUidsWithRelationToCategory($categoryUid);
            $config['additionalWhere'] = ($config['additionalWhere'] ?? '')
                . $this->createAdditionalWhereForPageUids($pageUids)
                ;
        }

        parent::__construct($request, $key, $config, $cObj);
    }

    private function getPageUidsWithRelationToCategory(int $categoryUid): array
    {
        $queryBuilder = GeneralUtility::makeInstance(ConnectionPool::class)
            ->getQueryBuilderForTable('pages');
        /* @var QueryBuilder $queryBuilder */

        $queryBuilder->select('uid');
        $queryBuilder->from('pages');
        $queryBuilder->leftJoin(
            'pages',
            'sys_category_record_mm',
            'mm',
            'pages.uid = mm.uid_foreign'
        );
        $queryBuilder->where(
            $queryBuilder->expr()->eq(
                'mm.tablenames',
                $queryBuilder->createNamedParameter('pages')
            ),
            $queryBuilder->expr()->eq(
                'mm.fieldname',
                $queryBuilder->createNamedParameter('categories')
            ),
            $queryBuilder->expr()->in(
                'mm.uid_local',
                $queryBuilder->createNamedParameter($categoryUid)
            )
        );

        return array_map(function (array $row) {
            return (int) $row['uid'];
        }, $queryBuilder->execute()->fetchAll());
    }

    private function createAdditionalWhereForPageUids(array $pageUids): string
    {
        return ' AND uid IN(' . implode(',', $pageUids) . ')';
    }
}