Version 1

[yaffs-website] / web / core / modules / language / src / Plugin / LanguageNegotiation / LanguageNegotiationUrlFallback.php

diff --git a/web/core/modules/language/src/Plugin/LanguageNegotiation/LanguageNegotiationUrlFallback.php b/web/core/modules/language/src/Plugin/LanguageNegotiation/LanguageNegotiationUrlFallback.php
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+++ b/web/core/modules/language/src/Plugin/LanguageNegotiation/LanguageNegotiationUrlFallback.php
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+<?php
+
+namespace Drupal\language\Plugin\LanguageNegotiation;
+
+use Drupal\language\LanguageNegotiationMethodBase;
+use Symfony\Component\HttpFoundation\Request;
+
+/**
+ * Class that determines the language to be assigned to URLs when none is
+ * detected.
+ *
+ * The language negotiation process has a fallback chain that ends with the
+ * default language negotiation method. Each built-in language type has a
+ * separate initialization:
+ * - Interface language, which is the only configurable one, always gets a valid
+ *   value. If no request-specific language is detected, the default language
+ *   will be used.
+ * - Content language merely inherits the interface language by default.
+ * - URL language is detected from the requested URL and will be used to rewrite
+ *   URLs appearing in the page being rendered. If no language can be detected,
+ *   there are two possibilities:
+ *   - If the default language has no configured path prefix or domain, then the
+ *     default language is used. This guarantees that (missing) URL prefixes are
+ *     preserved when navigating through the site.
+ *   - If the default language has a configured path prefix or domain, a
+ *     requested URL having an empty prefix or domain is an anomaly that must be
+ *     fixed. This is done by introducing a prefix or domain in the rendered
+ *     page matching the detected interface language.
+ *
+ * @LanguageNegotiation(
+ *   id = Drupal\language\Plugin\LanguageNegotiation\LanguageNegotiationUrlFallback::METHOD_ID,
+ *   types = {Drupal\Core\Language\LanguageInterface::TYPE_URL},
+ *   weight = 8,
+ *   name = @Translation("URL fallback"),
+ *   description = @Translation("Use an already detected language for URLs if none is found.")
+ * )
+ */
+class LanguageNegotiationUrlFallback extends LanguageNegotiationMethodBase {
+
+  /**
+   * The language negotiation method id.
+   */
+  const METHOD_ID = 'language-url-fallback';
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getLangcode(Request $request = NULL) {
+    $langcode = NULL;
+
+    if ($this->languageManager) {
+      $default = $this->languageManager->getDefaultLanguage();
+      $config = $this->config->get('language.negotiation')->get('url');
+      $prefix = ($config['source'] == LanguageNegotiationUrl::CONFIG_PATH_PREFIX);
+
+      // If the default language is not configured to convey language
+      // information, a missing URL language information indicates that URL
+      // language should be the default one, otherwise we fall back to an
+      // already detected language.
+      if (($prefix && empty($config['prefixes'][$default->getId()])) || (!$prefix && empty($config['domains'][$default->getId()]))) {
+        $langcode = $default->getId();
+      }
+      else {
+        $langcode = $this->languageManager->getCurrentLanguage()->getId();
+      }
+    }
+
+    return $langcode;
+  }
+
+}