UserToolbarItem.php

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<?php
namespace TYPO3\CMS\Backend\Backend\ToolbarItems;

/*
 * 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\Backend\Domain\Repository\Module\BackendModuleRepository;
use TYPO3\CMS\Backend\Toolbar\ToolbarItemInterface;
use TYPO3\CMS\Backend\Utility\BackendUtility;
use TYPO3\CMS\Core\Utility\GeneralUtility;
use TYPO3\CMS\Fluid\View\StandaloneView;

class UserToolbarItem implements ToolbarItemInterface
{
    public function checkAccess()
    {
        return true;
    }

    public function getItem()
    {
        $backendUser = $this->getBackendUser();
        $view = $this->getFluidTemplateObject('UserToolbarItem.html');
        $view->assignMultiple([
            'currentUser' => $backendUser->user,
            'switchUserMode' => $backendUser->user['ses_backuserid'],
        ]);
        return $view->render();
    }

    public function getDropDown()
    {
        $backendModuleRepository = GeneralUtility::makeInstance(BackendModuleRepository::class);
        $view = $this->getFluidTemplateObject('UserToolbarItemDropDown.html');
        $view->assignMultiple([
            'modules' => $backendModuleRepository->findByModuleName('user')->getChildren(),
            'logoutUrl' => BackendUtility::getModuleUrl('logout'),
            'switchUserMode' => $this->getBackendUser()->user['ses_backuserid'],
        ]);
        return $view->render();
    }

    public function getAdditionalAttributes()
    {
        $result = [
            'class' => 'toolbar-item-user'
        ];
        if ($this->getBackendUser()->user['ses_backuserid']) {
            $result['class'] .= ' su-user';
        }
        return $result;
    }

    public function hasDropDown()
    {
        return true;
    }

    public function getIndex()
    {
        return 80;
    }

    protected function getBackendUser()
    {
        return $GLOBALS['BE_USER'];
    }

    protected function getFluidTemplateObject(string $filename): StandaloneView
    {
        $view = GeneralUtility::makeInstance(StandaloneView::class);
        $view->setLayoutRootPaths(['EXT:backend/Resources/Private/Layouts']);
        $view->setPartialRootPaths(['EXT:backend/Resources/Private/Partials/ToolbarItems']);
        $view->setTemplateRootPaths(['EXT:backend/Resources/Private/Templates/ToolbarItems']);

        $view->setTemplate($filename);

        $view->getRequest()->setControllerExtensionName('Backend');
        return $view;
    }
}