class NavigationUserBlock

final class NavigationUserBlock extends BlockBase implements ContainerFactoryPluginInterface {
    const NAVIGATION_LINKS_MENU = 'navigation-user-links';
    
    /**
     * Constructs a new SystemMenuBlock.
     *
     * @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.
     * @param \Symfony\Component\DependencyInjection\ContainerInterface $container
     *   The container.
     * @param \Drupal\Core\Menu\MenuLinkTreeInterface $menuTree
     *   The menu link tree.
     */
    public function __construct(array $configuration, $plugin_id, $plugin_definition, ContainerInterface $container, MenuLinkTreeInterface $menuTree) {
        parent::__construct($configuration, $plugin_id, $plugin_definition);
    }
    
    /**
     * {@inheritdoc}
     */
    public static function create(ContainerInterface $container, array $configuration, $plugin_id, $plugin_definition) : self {
        return new static($configuration, $plugin_id, $plugin_definition, $container, $container->get('navigation.menu_tree'));
    }
    
    /**
     * {@inheritdoc}
     */
    public function build() : array {
        $menu_name = static::NAVIGATION_LINKS_MENU;
        $parameters = new MenuTreeParameters();
        $parameters->setMinDepth(0)
            ->setMaxDepth(2)
            ->onlyEnabledLinks();
        $subtree = $this->menuTree
            ->load($menu_name, $parameters);
        // Create a parent link that serves as a wrapper.
        // If the menu is removed for any reason, this item shows a link to the
        // user profile page as a fallback.
        $link = MenuLinkDefault::create($this->container, [], 'navigation.user_links.user.wrapper', $this->menuLinkDefinition());
        $tree = new MenuLinkTreeElement($link, TRUE, 1, FALSE, $subtree);
        $manipulators = [
            [
                'callable' => 'menu.default_tree_manipulators:checkAccess',
            ],
            [
                'callable' => 'menu.default_tree_manipulators:generateIndexAndSort',
            ],
        ];
        $tree = $this->menuTree
            ->transform([
            $tree,
        ], $manipulators);
        $build = $this->menuTree
            ->build($tree);
        $build['#title'] = $this->configuration['label'];
        $build += [
            '#attached' => [
                'library' => [
                    'navigation/internal.user-block',
                ],
            ],
            '#attributes' => [
                'data-user-block' => TRUE,
            ],
        ];
        return $build;
    }
    
    /**
     * Custom wrapper element definition.
     *
     * @return array
     *   The menu link definition.
     */
    protected function menuLinkDefinition() : array {
        return [
            'menu_name' => 'navigation-user-links',
            'route_name' => 'user.page',
            'title' => $this->t('My Account'),
            'description' => '',
            'options' => [],
            'provider' => 'navigation',
            'enabled' => '1',
        ];
    }

}