Issue #3348592 by alexpott, kunal_sahu, joseph.olstad, catch, larowlan,...

Issue #3348592 by alexpott, kunal_sahu, joseph.olstad, catch, larowlan, amaria, james.williams, longwave: [regression] Language switcher block throws exception when no route is matched

(cherry picked from commit fca42b9d)

core/modules/language/src/Plugin/Block/LanguageBlock.php

@@ -84,7 +84,11 @@ protected function blockAccess(AccountInterface $account) {
   public function build() {
     $build = [];
     $type = $this->getDerivativeId();
-    $links = $this->languageManager->getLanguageSwitchLinks($type, Url::fromRouteMatch(\Drupal::routeMatch()));
+    $route_match = \Drupal::routeMatch();
+    // If there is no route match, for example when creating blocks on 404 pages
+    // for logged-in users with big_pipe enabled using the front page instead.
+    $url = $route_match->getRouteObject() ? Url::fromRouteMatch($route_match) : Url::fromRoute('<front>');
+    $links = $this->languageManager->getLanguageSwitchLinks($type, $url);
 
     if (isset($links->links)) {
       $build = [

core/modules/language/tests/src/Functional/LanguageSwitchingTest.php

@@ -8,6 +8,8 @@
 use Drupal\Core\Language\LanguageInterface;
 use Drupal\Tests\BrowserTestBase;
 
+// cspell:ignore publi publié
+
 /**
  * Functional tests for the language switching feature.
  *
@@ -50,6 +52,7 @@ protected function setUp(): void {
       'administer blocks',
       'administer languages',
       'access administration pages',
+      'access content',
     ]);
     $this->drupalLogin($admin_user);
   }
@@ -82,6 +85,18 @@ public function testLanguageBlock() {
 
     $this->doTestLanguageBlockAuthenticated($block->label());
     $this->doTestLanguageBlockAnonymous($block->label());
+    $this->doTestLanguageBlock404($block->label(), 'system/404');
+
+    // Test 404s with big_pipe where the behaviour is different for logged-in
+    // users.
+    \Drupal::service('module_installer')->install(['big_pipe']);
+    $this->rebuildAll();
+    $this->doTestLanguageBlock404($block->label(), 'system/404');
+    $this->drupalLogin($this->drupalCreateUser());
+    // @todo This is testing the current behaviour with the big_pipe module
+    //   enabled. This behaviour is a bug will be fixed in
+    //   https://www.drupal.org/project/drupal/issues/3349201.
+    $this->doTestLanguageBlock404($block->label(), '<front>');
   }
 
   /**
@@ -187,6 +202,52 @@ protected function doTestLanguageBlockAnonymous($block_label) {
     $this->assertSame(['English', 'français'], $labels, 'The language links labels are in their own language on the language switcher block.');
   }
 
+  /**
+   * Tests the language switcher block on 404 pages.
+   *
+   * @param string $block_label
+   *   The label of the language switching block.
+   * @param string $system_path
+   *   The expected system path for the links in the language switcher.
+   *
+   * @see self::testLanguageBlock()
+   */
+  protected function doTestLanguageBlock404(string $block_label, string $system_path) {
+    $this->drupalGet('does-not-exist-' . $this->randomMachineName());
+    $this->assertSession()->pageTextContains($block_label);
+
+    // Assert that each list item and anchor element has the appropriate data-
+    // attributes.
+    $language_switchers = $this->xpath('//div[@id=:id]/ul/li', [':id' => 'block-test-language-block']);
+    $list_items = [];
+    $anchors = [];
+    $labels = [];
+    foreach ($language_switchers as $list_item) {
+      $list_items[] = [
+        'hreflang' => $list_item->getAttribute('hreflang'),
+        'data-drupal-link-system-path' => $list_item->getAttribute('data-drupal-link-system-path'),
+      ];
+
+      $link = $list_item->find('xpath', 'a');
+      $anchors[] = [
+        'hreflang' => $link->getAttribute('hreflang'),
+        'data-drupal-link-system-path' => $link->getAttribute('data-drupal-link-system-path'),
+      ];
+      $labels[] = $link->getText();
+    }
+    $expected_list_items = [
+      0 => ['hreflang' => 'en', 'data-drupal-link-system-path' => $system_path],
+      1 => ['hreflang' => 'fr', 'data-drupal-link-system-path' => $system_path],
+    ];
+    $this->assertSame($expected_list_items, $list_items, 'The list items have the correct attributes that will allow the drupal.active-link library to mark them as active.');
+    $expected_anchors = [
+      0 => ['hreflang' => 'en', 'data-drupal-link-system-path' => $system_path],
+      1 => ['hreflang' => 'fr', 'data-drupal-link-system-path' => $system_path],
+    ];
+    $this->assertSame($expected_anchors, $anchors, 'The anchors have the correct attributes that will allow the drupal.active-link library to mark them as active.');
+    $this->assertSame(['English', 'français'], $labels, 'The language links labels are in their own language on the language switcher block.');
+  }
+
   /**
    * Tests language switcher links for domain based negotiation.
    */
@@ -445,6 +506,120 @@ public function testLanguageSessionSwitchLinks() {
     $this->assertSession()->addressEquals('user/2');
   }
 
+  /**
+   * Test that the language switching block does not expose restricted paths.
+   */
+  public function testRestrictedPaths(): void {
+    \Drupal::service('module_installer')->install(['node']);
+    $entity_type_manager = \Drupal::entityTypeManager();
+
+    // Add the French language.
+    ConfigurableLanguage::createFromLangcode('fr')->save();
+
+    // Enable URL language detection and selection.
+    $this->config('language.types')
+      ->set('negotiation.language_interface.enabled.language-url', 1)
+      ->save();
+
+    // Enable the language switching block.
+    $block = $this->drupalPlaceBlock('language_block:' . LanguageInterface::TYPE_INTERFACE);
+
+    // Create a node type and make it translatable.
+    $entity_type_manager->getStorage('node_type')
+      ->create([
+        'type' => 'page',
+        'name' => 'Page',
+      ])
+      ->save();
+
+    // Create a published node with an unpublished translation.
+    $node = $entity_type_manager->getStorage('node')
+      ->create([
+        'type' => 'page',
+        'title' => $this->randomMachineName(),
+        'status' => 1,
+      ]);
+    $node->save();
+    $node->addTranslation('fr', ['title' => 'Non publié', 'status' => 0]);
+    $node->save();
+
+    // Create path aliases.
+    $alias_storage = $entity_type_manager->getStorage('path_alias');
+    $alias_storage->create([
+      'path' => '/user/1',
+      'alias' => '/secret-identity/peter-parker',
+    ])->save();
+    $alias_storage->create([
+      'path' => '/node/1',
+      'langcode' => 'en',
+      'alias' => '/press-release/published-report',
+    ])->save();
+    $alias_storage->create([
+      'path' => '/node/1',
+      'langcode' => 'fr',
+      'alias' => '/press-release/rapport-non-publié',
+    ])->save();
+
+    // Visit a restricted user page.
+    // Assert that the language switching block is displayed on the
+    // access-denied page, but it does not contain the path alias.
+    $this->assertLinkMarkup('/user/1', 403, $block->label(), 'peter-parker');
+
+    // Visit the node and its translation. Use internal paths and aliases. The
+    // non-ASCII character may be escaped, so remove it from the search string.
+    $this->assertLinkMarkup('/node/1', 200, $block->label(), 'rapport-non-publi');
+    $this->assertLinkMarkup('/press-release/published-report', 200, $block->label(), 'rapport-non-publi');
+    $this->assertLinkMarkup('/fr/node/1', 403, $block->label(), 'rapport-non-publi');
+    $this->assertLinkMarkup('/fr/press-release/rapport-non-publié', 403, $block->label(), 'rapport-non-publi');
+
+    // Test as a user with access to other users and unpublished content.
+    $privileged_user = $this->drupalCreateUser([
+      'access user profiles',
+      'bypass node access',
+    ]);
+    $this->drupalLogin($privileged_user);
+    $this->assertLinkMarkup('/user/1', 200, $block->label(), 'peter-parker', TRUE);
+    $this->assertLinkMarkup('/node/1', 200, $block->label(), 'rapport-non-publi', TRUE);
+    $this->assertLinkMarkup('/press-release/published-report', 200, $block->label(), 'rapport-non-publi', TRUE);
+    $this->assertLinkMarkup('/fr/node/1', 200, $block->label(), 'rapport-non-publi', TRUE);
+    $this->assertLinkMarkup('/fr/press-release/rapport-non-publié', 200, $block->label(), 'rapport-non-publi', TRUE);
+
+    // Test as an anonymous user.
+    $this->drupalLogout();
+    $this->assertLinkMarkup('/user/1', 403, $block->label(), 'peter-parker');
+    $this->assertLinkMarkup('/node/1', 200, $block->label(), 'rapport-non-publi');
+    $this->assertLinkMarkup('/press-release/published-report', 200, $block->label(), 'rapport-non-publi');
+    $this->assertLinkMarkup('/fr/node/1', 403, $block->label(), 'rapport-non-publi');
+    $this->assertLinkMarkup('/fr/press-release/rapport-non-publié', 403, $block->label(), 'rapport-non-publi');
+  }
+
+  /**
+   * Asserts that restricted text is or is not present in the page response.
+   *
+   * @param string $path
+   *   The path to test.
+   * @param int $status
+   *   The HTTP status code, such as 200 or 403.
+   * @param string $marker
+   *   Text that should always be present.
+   * @param string $restricted
+   *   Text that should be tested.
+   * @param bool $found
+   *   (optional) If TRUE, then the restricted text is present. Defaults to
+   *   FALSE.
+   */
+  protected function assertLinkMarkup(string $path, int $status, string $marker, string $restricted, bool $found = FALSE): void {
+    $this->drupalGet($path);
+    $this->assertSession()->statusCodeEquals($status);
+    $this->assertSession()->pageTextContains($marker);
+    if ($found) {
+      $this->assertSession()->responseContains($restricted);
+    }
+    else {
+      $this->assertSession()->responseNotContains($restricted);
+    }
+  }
+
   /**
    * Saves the native name of a language entity in configuration as a label.
    *