ds-site/Classes/EventListener/PageLayoutHeader.php

<?php

declare(strict_types=1);

/*
 * Copyright (C) 2019 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\EventListener;

use TYPO3\CMS\Backend\Controller\Event\ModifyPageLayoutContentEvent;
use TYPO3\CMS\Backend\Utility\BackendUtility;
use TYPO3\CMS\Core\Utility\GeneralUtility;
use TYPO3\CMS\Fluid\View\StandaloneView;
use TYPO3\CMS\Frontend\Resource\FileCollector;

class PageLayoutHeader
{
    private function getView(): StandaloneView
    {
        return GeneralUtility::makeInstance(StandaloneView::class);
    }

    private function resolvePageMedia(int $pageUid): array
    {
        $files = GeneralUtility::makeInstance(FileCollector::class);
        $files->addFilesFromRelation('pages', 'media', ['uid' => $pageUid]);

        return $files->getFiles();
    }

    public function __invoke(ModifyPageLayoutContentEvent $event): void
    {
        $request = $event->getRequest();
        $pageinfo = BackendUtility::readPageAccess((int) ($request->getQueryParams()['id'] ?? 0), '');

        // TODO: Check whether two levels up is uid 2, which holds all blog posts
        // To prevent rendering on non blog posts
        // Maybe we have rootline ?

        $view = $this->getView();
        $view->setRequest($request);
        $view->assignMultiple([
            'record' => $pageinfo,
            'metaInfo' => [
                [
                    'label' => 'meta-description',
                    'value' => $pageinfo['description'] ?? '',
                    'field' => 'description',
                    'type' => 'string',
                ],
                [
                    'label' => 'introduction',
                    'value' => $pageinfo['abstract'] ?? '',
                    'field' => 'abstract',
                    'type' => 'string',
                ],
                [
                    'label' => 'published',
                    'value' => $pageinfo['lastUpdated'] ?? '',
                    'field' => 'lastUpdated',
                    'type' => 'date',
                ],
                [
                    'label' => 'updated',
                    'value' => $pageinfo['SYS_LASTCHANGED'] ?? '',
                    'type' => 'date',
                ],
                [
                    'label' => 'media',
                    'value' => $this->resolvePageMedia((int) $pageinfo['uid']),
                    'field' => 'media',
                    'type' => 'files',
                ],
            ],
        ]);
        $view->setTemplatePathAndFilename('EXT:ds_site/Resources/Private/Templates/Backend/Page/MetaInfo.html');

        $event->addHeaderContent($view->render());
    }
}