mail-account-admin/src/Frontend/BaseController.php

<?php
declare(strict_types=1);

namespace MailAccountAdmin\Frontend;

use MailAccountAdmin\Common\UserHelper;
use Slim\Views\Twig;

class BaseController
{
    /** @var Twig */
    protected $view;
    /** @var UserHelper */
    protected $userHelper;

    public function __construct(Twig $view, UserHelper $userHelper)
    {
        $this->view = $view;
        $this->userHelper = $userHelper;

        // Register globals
        $twigEnv = $view->getEnvironment();
        $twigEnv->addGlobal('current_user_name', $userHelper->isLoggedIn() ? $userHelper->getCurrentUser()->getUsername() : null);
    }
}