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typo3/sysext/seo/Classes/HrefLang/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 to add the hreflang tags to the page
+ *
+ * @internal
+ */
+class HrefLangGenerator
+{
+    /**
+     * The content object renderer
+     *
+     * @var ContentObjectRenderer
+     */
+    public $cObj;
+
+    /**
+     * @var TypoScriptFrontendController
+     */
+    protected $typoScriptFrontendController;
+
+    /**
+     * @var ServerRequestInterface
+     */
+    protected $request;
+
+    /**
+     * HreflangGenerator constructor
+     *
+     * @param ContentObjectRenderer|null $cObj
+     * @param TypoScriptFrontendController|null $typoScriptFrontendController
+     */
+    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);
+    }
+
+    /**
+     * @param string $url
+     * @return string
+     */
+    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;
+    }
+
+    /**
+     * @return SiteLanguage
+     */
+    protected function getSiteLanguage(): SiteLanguage
+    {
+        return $this->request->getAttribute('language');
+    }
+
+    /**
+     * @return TypoScriptFrontendController
+     */
+    protected function getTypoScriptFrontendController(): TypoScriptFrontendController
+    {
+        return $GLOBALS['TSFE'];
+    }
+
+    /**
+     * @return ServerRequestInterface
+     */
+    protected function getRequest(): ServerRequestInterface
+    {
+        return $GLOBALS['TYPO3_REQUEST'];
+    }
+}