class LinkFieldTest

class LinkFieldTest extends BrowserTestBase {
  use PathAliasTestTrait;
  
  /**
   * {@inheritdoc}
   */
  protected static $modules = [
    'entity_test',
    'link',
    'node',
  ];
  
  /**
   * {@inheritdoc}
   */
  protected $defaultTheme = 'link_test_theme';
  
  /**
   * A field to use in this test class.
   *
   * @var \Drupal\field\Entity\FieldStorageConfig
   */
  protected $fieldStorage;
  
  /**
   * The instance used in this test class.
   *
   * @var \Drupal\field\Entity\FieldConfig
   */
  protected $field;
  
  /**
   * {@inheritdoc}
   */
  protected function setUp() : void {
    parent::setUp();
    $this->drupalLogin($this->drupalCreateUser([
      'view test entity',
      'administer entity_test content',
      'link to any page',
    ]));
  }
  
  /**
   * Tests the functionality and rendering of the link field.
   *
   * This is being as one to avoid multiple Drupal install.
   */
  public function testLinkField() : void {
    $this->doTestURLValidation();
    $this->doTestLinkTitle();
    $this->doTestEditNonNodeEntityLink();
  }
  
  /**
   * Tests link field URL validation.
   */
  protected function doTestURLValidation() : void {
    $field_name = $this->randomMachineName();
    // Create a field with settings to validate.
    $this->fieldStorage = FieldStorageConfig::create([
      'field_name' => $field_name,
      'entity_type' => 'entity_test',
      'type' => 'link',
    ]);
    $this->fieldStorage
      ->save();
    $this->field = FieldConfig::create([
      'field_storage' => $this->fieldStorage,
      'bundle' => 'entity_test',
      'settings' => [
        'title' => DRUPAL_DISABLED,
        'link_type' => LinkItemInterface::LINK_GENERIC,
      ],
    ]);
    $this->field
      ->save();
    /** @var \Drupal\Core\Entity\EntityDisplayRepositoryInterface $display_repository */
    $display_repository = \Drupal::service('entity_display.repository');
    $display_repository->getFormDisplay('entity_test', 'entity_test')
      ->setComponent($field_name, [
      'type' => 'link_default',
      'settings' => [
        'placeholder_url' => 'http://example.com',
      ],
    ])
      ->save();
    $display_repository->getViewDisplay('entity_test', 'entity_test', 'full')
      ->setComponent($field_name, [
      'type' => 'link',
    ])
      ->save();
    // Display creation form.
    $this->drupalGet('entity_test/add');
    $this->assertSession()
      ->fieldValueEquals("{$field_name}[0][uri]", '');
    $this->assertSession()
      ->responseContains('placeholder="http://example.com"');
    // Create a path alias.
    $this->createPathAlias('/admin', '/a/path/alias');
    // Create a node to test the link widget.
    $node = $this->drupalCreateNode();
    $restricted_node = $this->drupalCreateNode([
      'status' => NodeInterface::NOT_PUBLISHED,
    ]);
    // Define some valid URLs (keys are the entered values, values are the
    // strings displayed to the user).
    $valid_external_entries = [
      'http://www.example.com/' => 'http://www.example.com/',
      // Strings within parenthesis without leading space char.
'http://www.example.com/strings_(string_within_parenthesis)' => 'http://www.example.com/strings_(string_within_parenthesis)',
      // Numbers within parenthesis without leading space char.
'http://www.example.com/numbers_(9999)' => 'http://www.example.com/numbers_(9999)',
    ];
    $valid_internal_entries = [
      '/entity_test/add' => '/entity_test/add',
      '/a/path/alias' => '/a/path/alias',
      // Front page, with query string and fragment.
'/' => '<front>',
      '/?example=llama' => '<front>?example=llama',
      '/#example' => '<front>#example',
      // Trailing spaces should be ignored.
'/ ' => '<front>',
      '/path with spaces ' => '/path with spaces',
      // @todo '<front>' is valid input for BC reasons, may be removed by
      //   https://www.drupal.org/node/2421941
'<front>' => '&lt;front&gt;',
      '<front>#example' => '&lt;front&gt;#example',
      '<front>?example=llama' => '&lt;front&gt;?example=llama',
      // Text-only links.
'<nolink>' => '&lt;nolink&gt;',
      'route:<nolink>' => '&lt;nolink&gt;',
      '<none>' => '&lt;none&gt;',
      '<button>' => '&lt;button&gt;',
      // Query string and fragment.
'?example=llama' => '?example=llama',
      '#example' => '#example',
      // Complex query string. Similar to facet links.
'?a[]=1&a[]=2' => '?a[]=1&amp;a[]=2',
      '?b[0]=1&b[1]=2' => '?b[0]=1&amp;b[1]=2',
      '?c[]=1&d=3&c[]=2' => '?c[]=1&amp;d=3&amp;c[]=2',
      '?e[f][g]=h' => '?e[f][g]=h',
      '?i[j[k]]=l' => '?i[j[k]]=l',
      '?x=1&x=2' => '?x=1&amp;x=2',
      '?z[0]=1&z[0]=2' => '?z[0]=1&amp;z[0]=2',
      // Entity reference autocomplete value.
$node->label() . ' (1)' => $node->label() . ' (1)',
      // Entity URI displayed as ER autocomplete value when displayed in a form.
'entity:node/1' => $node->label() . ' (1)',
      // URI for an entity that exists, but is not accessible by the user.
'entity:node/' . $restricted_node->id() => '- Restricted access - (' . $restricted_node->id() . ')',
      // URI for an entity that doesn't exist, but with a valid ID.
'entity:user/999999' => 'entity:user/999999',
    ];
    // Define some invalid URLs.
    $validation_error_1 = "The path '@link_path' is invalid.";
    $validation_error_2 = 'Manually entered paths should start with one of the following characters: / ? #';
    $validation_error_3 = "The path '@link_path' is inaccessible.";
    $invalid_external_entries = [
      // Invalid protocol.
'invalid://not-a-valid-protocol' => $validation_error_1,
      // Missing host name.
'http://' => $validation_error_1,
    ];
    $invalid_internal_entries = [
      'no-leading-slash' => $validation_error_2,
      'entity:non_existing_entity_type/yar' => $validation_error_1,
      // URI for an entity that doesn't exist, with an invalid ID.
'entity:user/invalid-parameter' => $validation_error_1,
    ];
    // Test external and internal URLs for
    // 'link_type' = LinkItemInterface::LINK_GENERIC.
    $this->assertValidEntries($field_name, $valid_external_entries + $valid_internal_entries);
    $this->assertInvalidEntries($field_name, $invalid_external_entries + $invalid_internal_entries);
    // Test external URLs for 'link_type' = LinkItemInterface::LINK_EXTERNAL.
    $this->field
      ->setSetting('link_type', LinkItemInterface::LINK_EXTERNAL);
    $this->field
      ->save();
    $this->assertValidEntries($field_name, $valid_external_entries);
    $this->assertInvalidEntries($field_name, $valid_internal_entries + $invalid_external_entries);
    // Test external URLs for 'link_type' = LinkItemInterface::LINK_INTERNAL.
    $this->field
      ->setSetting('link_type', LinkItemInterface::LINK_INTERNAL);
    $this->field
      ->save();
    $this->assertValidEntries($field_name, $valid_internal_entries);
    $this->assertInvalidEntries($field_name, $valid_external_entries + $invalid_internal_entries);
    // Ensure that users with 'link to any page', don't apply access checking.
    $this->drupalLogin($this->drupalCreateUser([
      'view test entity',
      'administer entity_test content',
    ]));
    $this->assertValidEntries($field_name, [
      '/entity_test/add' => '/entity_test/add',
    ]);
    $this->assertInValidEntries($field_name, [
      '/admin' => $validation_error_3,
    ]);
  }
  
  /**
   * Asserts that valid URLs can be submitted.
   *
   * @param string $field_name
   *   The field name.
   * @param array $valid_entries
   *   An array of valid URL entries.
   *
   * @internal
   */
  protected function assertValidEntries(string $field_name, array $valid_entries) : void {
    foreach ($valid_entries as $uri => $string) {
      $edit = [
        "{$field_name}[0][uri]" => $uri,
      ];
      $this->drupalGet('entity_test/add');
      $this->submitForm($edit, 'Save');
      preg_match('|entity_test/manage/(\\d+)|', $this->getUrl(), $match);
      $id = $match[1];
      $this->assertSession()
        ->statusMessageContains('entity_test ' . $id . ' has been created.', 'status');
      $this->assertSession()
        ->responseContains('"' . $string . '"');
    }
  }
  
  /**
   * Asserts that invalid URLs cannot be submitted.
   *
   * @param string $field_name
   *   The field name.
   * @param array $invalid_entries
   *   An array of invalid URL entries.
   *
   * @internal
   */
  protected function assertInvalidEntries(string $field_name, array $invalid_entries) : void {
    foreach ($invalid_entries as $invalid_value => $error_message) {
      $edit = [
        "{$field_name}[0][uri]" => $invalid_value,
      ];
      $this->drupalGet('entity_test/add');
      $this->submitForm($edit, 'Save');
      $this->assertSession()
        ->responseContains(strtr($error_message, [
        '@link_path' => $invalid_value,
      ]));
    }
  }
  
  /**
   * Tests the link title settings of a link field.
   */
  protected function doTestLinkTitle() : void {
    $field_name = $this->randomMachineName();
    // Create a field with settings to validate.
    $this->fieldStorage = FieldStorageConfig::create([
      'field_name' => $field_name,
      'entity_type' => 'entity_test',
      'type' => 'link',
    ]);
    $this->fieldStorage
      ->save();
    $this->field = FieldConfig::create([
      'field_storage' => $this->fieldStorage,
      'bundle' => 'entity_test',
      'label' => 'Read more about this entity',
      'settings' => [
        'title' => DRUPAL_OPTIONAL,
        'link_type' => LinkItemInterface::LINK_GENERIC,
      ],
    ]);
    $this->field
      ->save();
    /** @var \Drupal\Core\Entity\EntityDisplayRepositoryInterface $display_repository */
    $display_repository = \Drupal::service('entity_display.repository');
    $display_repository->getFormDisplay('entity_test', 'entity_test')
      ->setComponent($field_name, [
      'type' => 'link_default',
      'settings' => [
        'placeholder_url' => 'http://example.com',
        'placeholder_title' => 'Enter the text for this link',
      ],
    ])
      ->save();
    $display_repository->getViewDisplay('entity_test', 'entity_test', 'full')
      ->setComponent($field_name, [
      'type' => 'link',
      'label' => 'hidden',
    ])
      ->save();
    // Verify that the link text field works according to the field setting.
    foreach ([
      DRUPAL_DISABLED,
      DRUPAL_REQUIRED,
      DRUPAL_OPTIONAL,
    ] as $title_setting) {
      // Update the link title field setting.
      $this->field
        ->setSetting('title', $title_setting);
      $this->field
        ->save();
      // Display creation form.
      $this->drupalGet('entity_test/add');
      // Assert label is shown.
      $this->assertSession()
        ->pageTextContains('Read more about this entity');
      $this->assertSession()
        ->fieldValueEquals("{$field_name}[0][uri]", '');
      $this->assertSession()
        ->responseContains('placeholder="http://example.com"');
      if ($title_setting === DRUPAL_DISABLED) {
        $this->assertSession()
          ->fieldNotExists("{$field_name}[0][title]");
        $this->assertSession()
          ->responseNotContains('placeholder="Enter the text for this link"');
      }
      else {
        $this->assertSession()
          ->responseContains('placeholder="Enter the text for this link"');
        $this->assertSession()
          ->fieldValueEquals("{$field_name}[0][title]", '');
        if ($title_setting === DRUPAL_OPTIONAL) {
          // Verify that the URL is required, if the link text is non-empty.
          $edit = [
            "{$field_name}[0][title]" => 'Example',
          ];
          $this->submitForm($edit, 'Save');
          $this->assertSession()
            ->statusMessageContains('The URL field is required when the Link text field is specified.', 'error');
        }
        if ($title_setting === DRUPAL_REQUIRED) {
          // Verify that the link text is required, if the URL is non-empty.
          $edit = [
            "{$field_name}[0][uri]" => 'http://www.example.com',
          ];
          $this->submitForm($edit, 'Save');
          $this->assertSession()
            ->statusMessageContains('Link text field is required if there is URL input.', 'error');
          // Verify that the link text is not required, if the URL is empty.
          $edit = [
            "{$field_name}[0][uri]" => '',
          ];
          $this->submitForm($edit, 'Save');
          $this->assertSession()
            ->statusMessageNotContains('Link text field is required.');
          // Verify that a URL and link text meets requirements.
          $this->drupalGet('entity_test/add');
          $edit = [
            "{$field_name}[0][uri]" => 'http://www.example.com',
            "{$field_name}[0][title]" => 'Example',
          ];
          $this->submitForm($edit, 'Save');
          $this->assertSession()
            ->statusMessageNotContains('Link text field is required.');
        }
      }
    }
    // Verify that a link without link text is rendered using the URL as text.
    $value = 'http://www.example.com/';
    $edit = [
      "{$field_name}[0][uri]" => $value,
      "{$field_name}[0][title]" => '',
    ];
    $this->submitForm($edit, 'Save');
    preg_match('|entity_test/manage/(\\d+)|', $this->getUrl(), $match);
    $id = $match[1];
    $this->assertSession()
      ->statusMessageContains('entity_test ' . $id . ' has been created.', 'status');
    $output = $this->renderTestEntity($id);
    $expected_link = (string) Link::fromTextAndUrl($value, Url::fromUri($value))->toString();
    $this->assertStringContainsString($expected_link, $output);
    // Verify that a link with text is rendered using the link text.
    $title = $this->randomMachineName();
    $edit = [
      "{$field_name}[0][title]" => $title,
    ];
    $this->drupalGet("entity_test/manage/{$id}/edit");
    $this->submitForm($edit, 'Save');
    $this->assertSession()
      ->statusMessageContains('entity_test ' . $id . ' has been updated.', 'status');
    $output = $this->renderTestEntity($id);
    $expected_link = (string) Link::fromTextAndUrl($title, Url::fromUri($value))->toString();
    $this->assertStringContainsString($expected_link, $output);
  }
  
  /**
   * Tests editing a link to a non-node entity.
   */
  protected function doTestEditNonNodeEntityLink() : void {
    $entity_type_manager = \Drupal::entityTypeManager();
    $entity_test_storage = $entity_type_manager->getStorage('entity_test');
    // Create a field with settings to validate.
    $this->fieldStorage = FieldStorageConfig::create([
      'field_name' => 'field_link',
      'entity_type' => 'entity_test',
      'type' => 'link',
      'cardinality' => 1,
    ]);
    $this->fieldStorage
      ->save();
    FieldConfig::create([
      'field_storage' => $this->fieldStorage,
      'label' => 'Read more about this entity',
      'bundle' => 'entity_test',
      'settings' => [
        'title' => DRUPAL_OPTIONAL,
      ],
    ])
      ->save();
    $entity_type_manager->getStorage('entity_form_display')
      ->load('entity_test.entity_test.default')
      ->setComponent('field_link', [
      'type' => 'link_default',
    ])
      ->save();
    // Create a node and a test entity to have a possibly valid reference for
    // both. Create another test entity that references the first test entity.
    $entity_test_link = $entity_test_storage->create([
      'name' => 'correct link target',
    ]);
    $entity_test_link->save();
    // Create a node with the same ID as the test entity to ensure that the link
    // doesn't match incorrectly.
    $this->drupalCreateNode([
      'title' => 'wrong link target',
    ]);
    $correct_link = 'entity:entity_test/' . $entity_test_link->id();
    $entity_test = $entity_test_storage->create([
      'name' => 'correct link target',
      'field_link' => $correct_link,
    ]);
    $entity_test->save();
    // Edit the entity and save it, verify the correct link is kept and not
    // changed to point to a node. Currently, widget does not support non-node
    // autocomplete and therefore must show the link unaltered.
    $this->drupalGet($entity_test->toUrl('edit-form'));
    $this->assertSession()
      ->fieldValueEquals('field_link[0][uri]', $correct_link);
    $this->submitForm([], 'Save');
    $entity_test_storage->resetCache();
    $entity_test = $entity_test_storage->load($entity_test->id());
    $this->assertEquals($correct_link, $entity_test->get('field_link')->uri);
  }
  
  /**
   * Renders a test_entity and returns the output.
   *
   * @param int $id
   *   The test_entity ID to render.
   * @param string $view_mode
   *   (optional) The view mode to use for rendering.
   * @param bool $reset
   *   (optional) Whether to reset the entity_test storage cache. Defaults to
   *   TRUE to simplify testing.
   *
   * @return string
   *   The rendered HTML output.
   */
  protected function renderTestEntity($id, $view_mode = 'full', $reset = TRUE) : string {
    if ($reset) {
      $this->container
        ->get('entity_type.manager')
        ->getStorage('entity_test')
        ->resetCache([
        $id,
      ]);
    }
    $entity = EntityTest::load($id);
    $display = \Drupal::service('entity_display.repository')->getViewDisplay($entity->getEntityTypeId(), $entity->bundle(), $view_mode);
    $content = $display->build($entity);
    $output = \Drupal::service('renderer')->renderRoot($content);
    return (string) $output;
  }
  
  /**
   * Test link widget exception handled if link uri value is invalid.
   */
  public function testLinkWidgetCaughtExceptionEditingInvalidUrl() : void {
    $field_name = $this->randomMachineName();
    $this->fieldStorage = FieldStorageConfig::create([
      'field_name' => $field_name,
      'entity_type' => 'entity_test',
      'type' => 'link',
      'cardinality' => 1,
    ]);
    $this->fieldStorage
      ->save();
    FieldConfig::create([
      'field_storage' => $this->fieldStorage,
      'label' => 'Link',
      'bundle' => 'entity_test',
      'settings' => [
        'title' => DRUPAL_OPTIONAL,
        'link_type' => LinkItemInterface::LINK_GENERIC,
      ],
    ])
      ->save();
    $entityTypeManager = $this->container
      ->get('entity_type.manager');
    $entityTypeManager->getStorage('entity_form_display')
      ->load('entity_test.entity_test.default')
      ->setComponent($field_name, [
      'type' => 'link_default',
    ])
      ->save();
    $entityTypeManager->getStorage('entity_view_display')
      ->create([
      'targetEntityType' => 'entity_test',
      'bundle' => 'entity_test',
      'mode' => 'full',
      'status' => TRUE,
    ])
      ->setComponent($field_name, [
      'type' => 'link',
    ])
      ->save();
    // Entities can be saved without validation, for example via migration.
    // Link fields may contain invalid uris such as external URLs without
    // scheme.
    $invalidUri = 'www.example.com';
    $invalidLinkUrlEntity = $entityTypeManager->getStorage('entity_test')
      ->create([
      'name' => 'Test entity with invalid link URL',
      $field_name => [
        'uri' => $invalidUri,
      ],
    ]);
    $invalidLinkUrlEntity->save();
    // If a user without 'link to any page' permission edits an entity, widget
    // checks access by converting uri to Url object, which will throw an
    // InvalidArgumentException if uri is invalid.
    $this->drupalLogin($this->drupalCreateUser([
      'view test entity',
      'administer entity_test content',
    ]));
    $this->drupalGet("/entity_test/manage/{$invalidLinkUrlEntity->id()}/edit");
    $this->assertSession()
      ->statusCodeEquals(200);
    $this->assertSession()
      ->fieldValueEquals("{$field_name}[0][uri]", $invalidUri);
  }

}