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typo3/sysext/beuser/Classes/ViewHelpers/SwitchUserViewHelper.php

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+<?php
+namespace TYPO3\CMS\Beuser\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\Beuser\Domain\Model\BackendUser;
+use TYPO3\CMS\Core\Imaging\Icon;
+use TYPO3\CMS\Core\Imaging\IconFactory;
+use TYPO3\CMS\Core\Utility\GeneralUtility;
+use TYPO3\CMS\Extbase\Utility\LocalizationUtility;
+use TYPO3Fluid\Fluid\Core\Rendering\RenderingContextInterface;
+use TYPO3Fluid\Fluid\Core\ViewHelper\AbstractViewHelper;
+use TYPO3Fluid\Fluid\Core\ViewHelper\Traits\CompileWithRenderStatic;
+
+/**
+ * Displays 'SwitchUser' link with sprite icon to change current backend user to target (non-admin) backendUser
+ * @internal
+ */
+class SwitchUserViewHelper extends AbstractViewHelper
+{
+    use CompileWithRenderStatic;
+
+    /**
+     * As this ViewHelper renders HTML, the output must not be escaped.
+     *
+     * @var bool
+     */
+    protected $escapeOutput = false;
+
+    /**
+     * Initializes the arguments
+     */
+    public function initializeArguments()
+    {
+        $this->registerArgument('backendUser', BackendUser::class, 'Target backendUser to switch active session to', true);
+    }
+
+    /**
+     * Render link with sprite icon to change current backend user to target
+     *
+     * @param array $arguments
+     * @param \Closure $renderChildrenClosure
+     * @param RenderingContextInterface $renderingContext
+     *
+     * @return string
+     */
+    public static function renderStatic(array $arguments, \Closure $renderChildrenClosure, RenderingContextInterface $renderingContext)
+    {
+        $backendUser = $arguments['backendUser'];
+        $iconFactory = GeneralUtility::makeInstance(IconFactory::class);
+        if ($backendUser->getUid() == $GLOBALS['BE_USER']->user['uid'] || !$backendUser->isActive() || $GLOBALS['BE_USER']->user['ses_backuserid']) {
+            return '<span class="btn btn-default disabled">' . $iconFactory->getIcon('empty-empty', Icon::SIZE_SMALL)->render() . '</span>';
+        }
+        $title = LocalizationUtility::translate('switchBackMode', 'beuser');
+        return '<a class="btn btn-default" href="' .
+            htmlspecialchars(GeneralUtility::linkThisScript(['SwitchUser' => $backendUser->getUid()])) .
+            '" target="_top" title="' . htmlspecialchars($title) . '">' .
+            $iconFactory->getIcon('actions-system-backend-user-switch', Icon::SIZE_SMALL)->render() . '</a>';
+    }
+}