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georgringer/HrefLangGenerator.php

Created September 17, 2019 12:18
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  1. georgringer created this gist Sep 17, 2019.
    44 changes: 44 additions & 0 deletions HrefLangGenerator.php
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    <?php
    declare(strict_types=1);

    namespace JosefGlatz\Theme\Xclass;

    use JosefGlatz\Theme\Service\LanguageAvailability;
    use TYPO3\CMS\Core\Site\Entity\Site;
    use TYPO3\CMS\Core\Utility\GeneralUtility;
    use TYPO3\CMS\Frontend\DataProcessing\LanguageMenuProcessor;
    use TYPO3\CMS\Seo\HrefLang\HrefLangGenerator;

    class HrefLangGeneratorXclass extends HrefLangGenerator {

    public function generate(): string
    {
    $hreflangs = [];
    if ((int)$this->typoScriptFrontendController->page['no_index'] === 1) {
    return '';
    }

    if ($this->request->getAttribute('site') instanceof Site) {
    $languageMenu = GeneralUtility::makeInstance(LanguageMenuProcessor::class);
    $languages = $languageMenu->process($this->cObj, [], [], []);
    foreach ($languages['languagemenu'] as $language) {
    if (LanguageAvailability::checkLanguageAvailability($language) && !empty($language['link'])) {
    $href = $this->getAbsoluteUrl($language['link']);
    $hreflangs[] =
    '<link rel="alternate" hreflang="' . htmlspecialchars($language['hreflang']) . '" href="' . htmlspecialchars($href) . '"/>';
    }
    }

    if (count($hreflangs) > 1) {
    $href = $this->getAbsoluteUrl($languages['languagemenu'][0]['link']);
    $hreflangs[] =
    '<link rel="alternate" hreflang="x-default" href="' . htmlspecialchars($href) . '"/>' . LF;

    $this->getTypoScriptFrontendController()->additionalHeaderData[] = implode(LF, $hreflangs);
    }
    }

    return implode(LF, $hreflangs);
    }

    }
    87 changes: 87 additions & 0 deletions LanguageAvailability.php
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    <?php
    declare(strict_types=1);

    namespace JosefGlatz\Theme\Service;

    use Psr\Http\Message\ServerRequestInterface;
    use TYPO3\CMS\Core\Database\ConnectionPool;
    use TYPO3\CMS\Core\Site\Entity\Site;
    use TYPO3\CMS\Core\Site\Entity\SiteLanguage;
    use TYPO3\CMS\Core\Utility\GeneralUtility;
    use TYPO3\CMS\Frontend\Controller\TypoScriptFrontendController;

    class LanguageAvailability
    {


    /**
    * @param $language
    * @return bool
    */
    public static function checkLanguageAvailability(array $language): bool
    {
    if ($language['available']) {
    return true;
    }
    $currentPage = self::getTsfe()->page;
    $currentSite = self::getCurrentSite();
    if ($currentSite) {
    $languageId = $language['languageId'];
    /** @var SiteLanguage $languageConfiguration */
    $languageConfiguration = $currentSite->getAllLanguages()[$languageId];

    // check fallbacks
    $fallbacks = $languageConfiguration->getFallbackLanguageIds();
    foreach ($fallbacks as $fallbackLanguageId) {
    if ($fallbackLanguageId === 0) {
    return true;
    }

    $row = self::getTranslationOfPage($currentPage['uid'], $fallbackLanguageId);
    if (is_array($row) && !empty($row)) {
    return true;
    }
    }

    }

    return false;
    }

    protected static function getTranslationOfPage(int $pageId, int $languageId)
    {
    $queryBuilder = GeneralUtility::makeInstance(ConnectionPool::class)
    ->getQueryBuilderForTable('pages');
    $row = $queryBuilder
    ->select('uid', 'title', 'pid')
    ->from('pages')
    ->where(
    $queryBuilder->expr()->eq(
    'l10n_parent',
    $queryBuilder->createNamedParameter($pageId, \PDO::PARAM_INT)
    ),
    $queryBuilder->expr()->eq(
    'sys_language_uid',
    $queryBuilder->createNamedParameter($languageId, \PDO::PARAM_INT)
    )
    )
    ->execute()
    ->fetch();

    return $row;
    }

    protected static function getTsfe(): TypoScriptFrontendController
    {
    return $GLOBALS['TSFE'];
    }

    protected static function getCurrentSite(): ?Site
    {
    if ($GLOBALS['TYPO3_REQUEST'] instanceof ServerRequestInterface
    && $GLOBALS['TYPO3_REQUEST']->getAttribute('site') instanceof Site) {
    return $GLOBALS['TYPO3_REQUEST']->getAttribute('site');
    }
    return null;
    }
    }
    5 changes: 5 additions & 0 deletions ext_localconf.php
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    <?php

    $GLOBALS['TYPO3_CONF_VARS']['SYS']['Objects'][\TYPO3\CMS\Seo\HrefLang\HrefLangGenerator::class] = [
    'className' => \JosefGlatz\Theme\Xclass\HrefLangGeneratorXclass::class,
    ];