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 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;
    }

}