HrefLangGenerator.php

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<?php
declare(strict_types = 1);
 
namespace ‪TYPO3\CMS\Seo\HrefLang;
 
/*
 * 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!
 */
 
use Psr\Http\Message\ServerRequestInterface;
use ‪TYPO3\CMS\Core\Http\Uri;
use ‪TYPO3\CMS\Core\Site\Entity\Site;
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;
 
class ‪HrefLangGenerator
{
    public ‪$cObj;
 
    protected ‪$typoScriptFrontendController;
 
    protected ‪$request;
 
    public function ‪__construct(‪ContentObjectRenderer ‪$cObj = null, ‪TypoScriptFrontendController ‪$typoScriptFrontendController = null, ServerRequestInterface ‪$request = null)
    {
        if (‪$cObj === null) {
            ‪$cObj = GeneralUtility::makeInstance(ContentObjectRenderer::class);
        }
        if (‪$typoScriptFrontendController === null) {
            ‪$typoScriptFrontendController = $this->‪getTypoScriptFrontendController();
        }
        if (‪$request === null) {
            ‪$request = $this->‪getRequest();
        }
 
        $this->cObj = ‪$cObj;
        $this->typoScriptFrontendController = ‪$typoScriptFrontendController;
        $this->request = ‪$request;
    }
 
    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 $language) {
                if ($language['available'] === 1 && !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);
    }
 
    protected function ‪getAbsoluteUrl(string $url): string
    {
        $uri = new Uri($url);
        if (empty($uri->getHost())) {
            $url = $this->‪getSiteLanguage()->‪getBase()->withPath($uri->getPath());
 
            if ($uri->getQuery()) {
                $url = $url->withQuery($uri->getQuery());
            }
        }
 
        return (string)$url;
    }
 
    protected function ‪getSiteLanguage(): SiteLanguage
    {
        return $this->request->getAttribute('language');
    }
 
    protected function ‪getTypoScriptFrontendController(): TypoScriptFrontendController
    {
        return ‪$GLOBALS['TSFE'];
    }
 
    protected function ‪getRequest(): ServerRequestInterface
    {
        return ‪$GLOBALS['TYPO3_REQUEST'];
    }
}