UsernameViewHelper.php

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<?php
namespace TYPO3\CMS\Belog\ViewHelpers;

/*
 * This file is part of the TYPO3 CMS project.
 *
 * It is free software; you can redistribute it and/or modify it under
 * the terms of the GNU General Public License, either version 2
 * of the License, or any later version.
 *
 * For the full copyright and license information, please read the
 * LICENSE.txt file that was distributed with this source code.
 *
 * The TYPO3 project - inspiring people to share!
 */

use TYPO3\CMS\Core\Utility\GeneralUtility;
use TYPO3\CMS\Extbase\Domain\Repository\BackendUserRepository;
use TYPO3\CMS\Extbase\Object\ObjectManager;
use TYPO3\CMS\Fluid\Core\ViewHelper\AbstractViewHelper;
use TYPO3Fluid\Fluid\Core\Rendering\RenderingContextInterface;
use TYPO3Fluid\Fluid\Core\ViewHelper\Traits\CompileWithRenderStatic;

class UsernameViewHelper extends AbstractViewHelper
{
    use CompileWithRenderStatic;

    protected static $usernameRuntimeCache = [];

    public function initializeArguments()
    {
        parent::initializeArguments();
        $this->registerArgument('uid', 'int', 'Uid of the user', true);
    }

    public static function renderStatic(array $arguments, \Closure $renderChildrenClosure, RenderingContextInterface $renderingContext)
    {
        $uid = $arguments['uid'];
        if (isset(static::$usernameRuntimeCache[$uid])) {
            return static::$usernameRuntimeCache[$uid];
        }

        $objectManager = GeneralUtility::makeInstance(ObjectManager::class);
        $backendUserRepository = $objectManager->get(BackendUserRepository::class);
        $user = $backendUserRepository->findByUid($uid);
        // $user may be NULL if user was deleted from DB, set it to empty string to always return a string
        static::$usernameRuntimeCache[$uid] = $user === null ? '' : $user->getUserName();
        return static::$usernameRuntimeCache[$uid];
    }
}