Set language on Link url to match field language.

src/Plugin/GraphQLCompose/FieldType/LinkItem.php

@@ -38,6 +38,9 @@ class LinkItem extends GraphQLComposeFieldTypeBase implements FieldProducerItemI
       ? $this->getUrlFromLink($item)
       : $this->getUrlFromOther($item);
 
+    // Match the Url language to the field item language.
+    $url->setOption('language', $this->languageManager->getLanguage($item->getLangcode()));
+
     $link = $url->toString(TRUE);
     $context->addCacheableDependency($link);
 

tests/src/Functional/Core/EntityLanguageTest.php

@@ -4,7 +4,11 @@ declare(strict_types=1);
 
 namespace Drupal\Tests\graphql_compose\Functional\Core;
 
+use Drupal\field\Entity\FieldConfig;
+use Drupal\field\Entity\FieldStorageConfig;
+use Drupal\link\LinkItemInterface;
 use Drupal\menu_link_content\Entity\MenuLinkContent;
+use Drupal\node\Entity\Node;
 use Drupal\node\NodeInterface;
 use Drupal\system\Entity\Menu;
 use Drupal\system\MenuInterface;
@@ -428,4 +432,173 @@ class EntityLanguageTest extends GraphQLComposeBrowserTestBase {
     $this->assertEquals('de', $content['data']['menu']['items'][0]['langcode']['id']);
   }
 
+  /**
+   * Test that a link field in a node is translated as expected.
+   */
+  public function testNodeLinkFieldUrlTranslated(): void {
+
+    // Create a field with settings to validate.
+    FieldStorageConfig::create([
+      'field_name' => 'field_internal_link',
+      'type' => 'link',
+      'entity_type' => 'node',
+    ])->save();
+
+    FieldConfig::create([
+      'field_name' => 'field_internal_link',
+      'entity_type' => 'node',
+      'bundle' => 'test',
+      'settings' => [
+        'title' => DRUPAL_OPTIONAL,
+        'link_type' => LinkItemInterface::LINK_INTERNAL,
+      ],
+    ])->save();
+
+    // Create a field with settings to validate.
+    FieldStorageConfig::create([
+      'field_name' => 'field_external_link',
+      'type' => 'link',
+      'entity_type' => 'node',
+    ])->save();
+
+    FieldConfig::create([
+      'field_name' => 'field_external_link',
+      'entity_type' => 'node',
+      'bundle' => 'test',
+      'settings' => [
+        'title' => DRUPAL_OPTIONAL,
+        'link_type' => LinkItemInterface::LINK_EXTERNAL,
+      ],
+    ])->save();
+
+    // Enable the new fields.
+    $this->setFieldConfig('node', 'test', 'field_internal_link', [
+      'enabled' => TRUE,
+    ]);
+
+    $this->setFieldConfig('node', 'test', 'field_external_link', [
+      'enabled' => TRUE,
+    ]);
+
+    // Reload the node.
+    $this->node = Node::load($this->node->id());
+    $deNode = $this->node->getTranslation('de');
+    $jaNode = $this->node->getTranslation('ja');
+
+    // Baseline link back to itself.
+    $this->node
+      ->set('field_internal_link', [
+        'uri' => 'internal:/test',
+        'title' => 'Link title',
+      ])
+      ->set('field_external_link', [
+        'uri' => 'https://example.com',
+        'title' => 'External en link',
+      ])
+      ->save();
+
+    // Link to the translated URL.
+    // Expecting this to stay as /en/test.
+    $deNode
+      ->set('field_internal_link', [
+        'uri' => 'internal:/en/test',
+        'title' => 'Link back to EN',
+      ])
+      ->set('field_external_link', [
+        'uri' => 'https://example.de',
+        'title' => 'External de link',
+      ])
+      ->save();
+
+    // Link to the non translated URL.
+    // Expecting this to become /ja/test.
+    $jaNode
+      ->set('field_internal_link', [
+        'uri' => 'internal:/test',
+        'title' => 'Link title (JA)',
+      ])
+      ->set('field_external_link', [
+        'uri' => 'https://example.ja',
+        'title' => 'External ja link',
+      ])
+      ->save();
+
+    $query = <<<GQL
+      query {
+        en: node(id: "{$this->node->uuid()}", langcode: "en") {
+          ... on NodeTest {
+            internalLink {
+              title
+              url
+              internal
+            }
+            externalLink {
+              title
+              url
+              internal
+            }
+          }
+        }
+
+        de: node(id: "{$this->node->uuid()}", langcode: "de") {
+          ... on NodeTest {
+            internalLink {
+              title
+              url
+              internal
+            }
+            externalLink {
+              title
+              url
+              internal
+            }
+          }
+        }
+
+        ja: node(id: "{$this->node->uuid()}", langcode: "ja") {
+          ... on NodeTest {
+            internalLink {
+              title
+              url
+              internal
+            }
+            externalLink {
+              title
+              url
+              internal
+            }
+          }
+        }
+      }
+    GQL;
+
+    $content = $this->executeQuery($query);
+
+    // Check internal links.
+    $this->assertEquals('Link title', $content['data']['en']['internalLink']['title']);
+    $this->assertEquals('Link back to EN', $content['data']['de']['internalLink']['title']);
+    $this->assertEquals('Link title (JA)', $content['data']['ja']['internalLink']['title']);
+
+    $this->assertEquals(base_path() . 'test', $content['data']['en']['internalLink']['url']);
+    $this->assertEquals(base_path() . 'en/test', $content['data']['de']['internalLink']['url']);
+    $this->assertEquals(base_path() . 'ja/test', $content['data']['ja']['internalLink']['url']);
+
+    $this->assertTrue($content['data']['en']['internalLink']['internal']);
+    $this->assertTrue($content['data']['de']['internalLink']['internal']);
+    $this->assertTrue($content['data']['ja']['internalLink']['internal']);
+
+    // Check external links.
+    $this->assertEquals('External en link', $content['data']['en']['externalLink']['title']);
+    $this->assertEquals('External de link', $content['data']['de']['externalLink']['title']);
+    $this->assertEquals('External ja link', $content['data']['ja']['externalLink']['title']);
+
+    $this->assertEquals('https://example.com', $content['data']['en']['externalLink']['url']);
+    $this->assertEquals('https://example.de', $content['data']['de']['externalLink']['url']);
+    $this->assertEquals('https://example.ja', $content['data']['ja']['externalLink']['url']);
+
+    $this->assertFalse($content['data']['en']['externalLink']['internal']);
+    $this->assertFalse($content['data']['de']['externalLink']['internal']);
+    $this->assertFalse($content['data']['ja']['externalLink']['internal']);
+  }
+
 }