Custom TYPO3 metatag manager to provide fallback og:image by sliding up the rootline

OpenGraphMetaTagManager.php

<?php

namespace My\Extension\MetaTag;

use TYPO3\CMS\Core\Resource\FileRepository;
use TYPO3\CMS\Core\Utility\GeneralUtility;
use TYPO3\CMS\Core\Utility\RootlineUtility;
use TYPO3\CMS\Extbase\Service\ImageService;

class OpenGraphMetaTagManager extends \TYPO3\CMS\Seo\MetaTag\OpenGraphMetaTagManager
{
    public function renderAllProperties(): string
    {
        if (array_key_exists('og:image', $this->properties)) {
            return parent::renderAllProperties();
        }
      
        /** @var FileRepository $fileRepository */
        $fileRepository = GeneralUtility::makeInstance(FileRepository::class);

        $pageUid = $this->getPageWithImage();

        if (null === $pageUid) {
            return parent::renderAllProperties();
        }

        $images = $fileRepository->findByRelation('pages', 'og_image', $pageUid);

        /** @var ImageService $imageService */
        $imageService = GeneralUtility::makeInstance(ImageService::class);

        foreach ($images as $image) {
            $processedImage = $imageService->applyProcessingInstructions(
                $image,
                [
                    'width' => '1200', // Hardcoded width, I know, too lazy
                ]
            );
            $this->addProperty(
                'og:image',
                $imageService->getImageUri($processedImage, true),
                [
                    'url' => $imageService->getImageUri($processedImage, true),
                    'width' => $processedImage->getProperty('width'),
                    'height' => $processedImage->getProperty('height'),
                    'type' => $processedImage->getMimeType(),
                ]
            );
        }

        return parent::renderAllProperties();
    }

    /**
     * @return null|int
     */
    protected function getPageWithImage()
    {
        $rootLineUtility = new RootlineUtility($GLOBALS['TSFE']->id);
        $rootLine = $rootLineUtility->get();

        foreach ($rootLine as $page) {
            if ($page['og_image'] > 0) {
                return $page['uid'];
            }
        }

        return null;
    }
}