HrefLangGenerator.php

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<?php
 
declare(strict_types=1);
 
/*
 * This file is part of the TYPO3 CMS project.
 *
 * It is free software; you can redistribute it and/or modify it under
 * the terms of the GNU General Public License, either version 2
 * of the License, or any later version.
 *
 * For the full copyright and license information, please read the
 * LICENSE.txt file that was distributed with this source code.
 *
 * The TYPO3 project - inspiring people to share!
 */
 
namespace ‪TYPO3\CMS\Seo\HrefLang;
 
use Psr\Http\Message\ServerRequestInterface;
use ‪TYPO3\CMS\Core\Context\Context;
use ‪TYPO3\CMS\Core\Context\LanguageAspectFactory;
use ‪TYPO3\CMS\Core\Domain\Repository\PageRepository;
use ‪TYPO3\CMS\Core\Http\Uri;
use ‪TYPO3\CMS\Core\Site\Entity\SiteInterface;
use ‪TYPO3\CMS\Core\Site\Entity\SiteLanguage;
use ‪TYPO3\CMS\Core\Utility\GeneralUtility;
use ‪TYPO3\CMS\Frontend\ContentObject\ContentObjectRenderer;
use ‪TYPO3\CMS\Frontend\Controller\TypoScriptFrontendController;
use ‪TYPO3\CMS\Frontend\DataProcessing\LanguageMenuProcessor;
use ‪TYPO3\CMS\Frontend\Event\ModifyHrefLangTagsEvent;
 
class ‪HrefLangGenerator
{
    public ‪$cObj;
 
    protected ‪$languageMenuProcessor;
 
    public function ‪__construct(‪ContentObjectRenderer ‪$cObj, ‪LanguageMenuProcessor ‪$languageMenuProcessor)
    {
        $this->cObj = ‪$cObj;
        $this->languageMenuProcessor = ‪$languageMenuProcessor;
    }
 
    public function ‪__invoke(‪ModifyHrefLangTagsEvent $event): void
    {
        $hrefLangs = $event->‪getHrefLangs();
        if ((int)$this->‪getTypoScriptFrontendController()->page['no_index'] === 1) {
            return;
        }
 
        $languages = $this->languageMenuProcessor->process($this->cObj, [], [], []);
        $siteLanguage = $event->‪getRequest()->getAttribute('language');
        $pageId = (int)$this->‪getTypoScriptFrontendController()->id;
 
        foreach ($languages['languagemenu'] as $language) {
            if (!empty($language['link']) && $language['hreflang']) {
                $page = $this->‪getTranslatedPageRecord($pageId, $language['languageId'], $event->‪getRequest());
                // do not set hreflang if a page is not translated explicitly
                if (empty($page)) {
                    continue;
                }
                // do not set hreflang when canonical is set explicitly
                if (!empty($page['canonical_link'])) {
                    continue;
                }
 
                $href = $this->‪getAbsoluteUrl($language['link'], $siteLanguage);
                $hrefLangs[$language['hreflang']] = $href;
            }
        }
 
        if (count($hrefLangs) > 1) {
            if (array_key_exists($languages['languagemenu'][0]['hreflang'], $hrefLangs)) {
                $hrefLangs['x-default'] = $hrefLangs[$languages['languagemenu'][0]['hreflang']];
            }
        }
 
        $event->‪setHrefLangs($hrefLangs);
    }
 
    protected function ‪getAbsoluteUrl(string $url, SiteLanguage $siteLanguage): string
    {
        $uri = new Uri($url);
        if (empty($uri->getHost())) {
            $url = $siteLanguage->getBase()->withPath($uri->getPath());
 
            if ($uri->getQuery()) {
                $url = $url->withQuery($uri->getQuery());
            }
        }
 
        return (string)$url;
    }
 
    protected function ‪getTypoScriptFrontendController(): TypoScriptFrontendController
    {
        return ‪$GLOBALS['TSFE'];
    }
 
    protected function ‪getTranslatedPageRecord(int $pageId, int $languageId, ServerRequestInterface $request): array
    {
        $site = $request->getAttribute('site');
        if (!$site instanceof ‪SiteInterface) {
            return $this->‪getTypoScriptFrontendController()->page;
        }
 
        $targetSiteLanguage = $site->getLanguageById($languageId);
        $languageAspect = ‪LanguageAspectFactory::createFromSiteLanguage($targetSiteLanguage);
 
        $context = clone GeneralUtility::makeInstance(Context::class);
        $context->setAspect('language', $languageAspect);
 
        $pageRepository = GeneralUtility::makeInstance(PageRepository::class, $context);
        if ($languageId > 0) {
            return $pageRepository->getPageOverlay($pageId, $languageId);
        }
        return $pageRepository->getPage($pageId);
    }
}