class RequestPath

class RequestPath extends ConditionPluginBase implements ContainerFactoryPluginInterface {
  
  /**
   * An alias manager to find the alias for the current system path.
   *
   * @var \Drupal\path_alias\AliasManagerInterface
   */
  protected $aliasManager;
  
  /**
   * The path matcher.
   *
   * @var \Drupal\Core\Path\PathMatcherInterface
   */
  protected $pathMatcher;
  
  /**
   * The request stack.
   *
   * @var \Symfony\Component\HttpFoundation\RequestStack
   */
  protected $requestStack;
  
  /**
   * The current path.
   *
   * @var \Drupal\Core\Path\CurrentPathStack
   */
  protected $currentPath;
  
  /**
   * Constructs a RequestPath condition plugin.
   *
   * @param \Drupal\path_alias\AliasManagerInterface $alias_manager
   *   An alias manager to find the alias for the current system path.
   * @param \Drupal\Core\Path\PathMatcherInterface $path_matcher
   *   The path matcher service.
   * @param \Symfony\Component\HttpFoundation\RequestStack $request_stack
   *   The request stack.
   * @param \Drupal\Core\Path\CurrentPathStack $current_path
   *   The current path.
   * @param array $configuration
   *   A configuration array containing information about the plugin instance.
   * @param string $plugin_id
   *   The plugin ID for the plugin instance.
   * @param array $plugin_definition
   *   The plugin implementation definition.
   */
  public function __construct(AliasManagerInterface $alias_manager, PathMatcherInterface $path_matcher, RequestStack $request_stack, CurrentPathStack $current_path, array $configuration, $plugin_id, array $plugin_definition) {
    parent::__construct($configuration, $plugin_id, $plugin_definition);
    $this->aliasManager = $alias_manager;
    $this->pathMatcher = $path_matcher;
    $this->requestStack = $request_stack;
    $this->currentPath = $current_path;
  }
  
  /**
   * {@inheritdoc}
   */
  public static function create(ContainerInterface $container, array $configuration, $plugin_id, $plugin_definition) {
    return new static($container->get('path_alias.manager'), $container->get('path.matcher'), $container->get('request_stack'), $container->get('path.current'), $configuration, $plugin_id, $plugin_definition);
  }
  
  /**
   * {@inheritdoc}
   */
  public function defaultConfiguration() {
    return [
      'pages' => '',
    ] + parent::defaultConfiguration();
  }
  
  /**
   * {@inheritdoc}
   */
  public function buildConfigurationForm(array $form, FormStateInterface $form_state) {
    $form['pages'] = [
      '#type' => 'textarea',
      '#title' => $this->t('Pages'),
      '#default_value' => $this->configuration['pages'],
      '#description' => $this->t("Specify pages by using their paths. Enter one path per line. The '*' character is a wildcard. An example path is %user-wildcard for every user page. %front is the front page.", [
        '%user-wildcard' => '/user/*',
        '%front' => '<front>',
      ]),
    ];
    return parent::buildConfigurationForm($form, $form_state);
  }
  
  /**
   * {@inheritdoc}
   */
  public function validateConfigurationForm(array &$form, FormStateInterface $form_state) {
    $paths = array_map('trim', explode("\n", $form_state->getValue('pages')));
    foreach ($paths as $path) {
      if (empty($path) || $path === '<front>' || str_starts_with($path, '/')) {
        continue;
      }
      $form_state->setErrorByName('pages', $this->t("The path %path requires a leading forward slash when used with the Pages setting.", [
        '%path' => $path,
      ]));
    }
  }
  
  /**
   * {@inheritdoc}
   */
  public function submitConfigurationForm(array &$form, FormStateInterface $form_state) {
    $this->configuration['pages'] = $form_state->getValue('pages');
    parent::submitConfigurationForm($form, $form_state);
  }
  
  /**
   * {@inheritdoc}
   */
  public function summary() {
    if (empty($this->configuration['pages'])) {
      return $this->t('No page is specified');
    }
    $pages = array_map('trim', explode("\n", $this->configuration['pages']));
    $pages = implode(', ', $pages);
    if (!empty($this->configuration['negate'])) {
      return $this->t('Do not return true on the following pages: @pages', [
        '@pages' => $pages,
      ]);
    }
    return $this->t('Return true on the following pages: @pages', [
      '@pages' => $pages,
    ]);
  }
  
  /**
   * {@inheritdoc}
   */
  public function evaluate() {
    // Convert path to lowercase. This allows comparison of the same path
    // with different case. Ex: /Page, /page, /PAGE.
    $pages = mb_strtolower($this->configuration['pages']);
    if (!$pages) {
      return TRUE;
    }
    $request = $this->requestStack
      ->getCurrentRequest();
    // Compare the lowercase path alias (if any) and internal path.
    $path = $this->currentPath
      ->getPath($request);
    // Do not trim a trailing slash if that is the complete path.
    $path = $path === '/' ? $path : rtrim($path, '/');
    $path_alias = mb_strtolower($this->aliasManager
      ->getAliasByPath($path));
    return $this->pathMatcher
      ->matchPath($path_alias, $pages) || $path != $path_alias && $this->pathMatcher
      ->matchPath($path, $pages);
  }
  
  /**
   * {@inheritdoc}
   */
  public function getCacheContexts() {
    $contexts = parent::getCacheContexts();
    $contexts[] = 'url.path';
    return $contexts;
  }

}