Bootstrap.php

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<?php
namespace TYPO3\CMS\SysNote\Core;

/*
 * 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\Database\Connection;
use TYPO3\CMS\Core\Database\ConnectionPool;
use TYPO3\CMS\Core\Utility\GeneralUtility;

class Bootstrap
{
    protected $extbaseConfiguration = [
        'vendorName' => 'TYPO3\\CMS',
        'extensionName' => 'SysNote',
        'pluginName' => 'Note',
    ];

    protected $currentGetArguments;

    public function run($controllerName, $actionName, array $arguments = [])
    {
        if (!$this->expectOutput($arguments)) {
            return '';
        }
        $arguments['controller'] = ucfirst(trim($controllerName));
        $arguments['action'] = lcfirst(trim($actionName));
        $this->overrideGetArguments($arguments);
        $extbaseBootstrap = GeneralUtility::makeInstance(\TYPO3\CMS\Extbase\Core\Bootstrap::class);
        $content = $extbaseBootstrap->run('', $this->extbaseConfiguration);
        $this->revertGetArguments();
        return $content;
    }

    protected function expectOutput(array $arguments = [])
    {
        // no pids set
        if (!isset($arguments['pids']) || empty($arguments['pids']) || empty($GLOBALS['BE_USER']->user['uid'])) {
            return false;
        }
        $cleanedPageIds = GeneralUtility::intExplode(',', $arguments['pids'], true);
        if (empty($cleanedPageIds)) {
            return false;
        }
        $queryBuilder = GeneralUtility::makeInstance(ConnectionPool::class)->getQueryBuilderForTable('sys_note');
        $count = $queryBuilder
            ->count('uid')
            ->from('sys_note')
            ->where(
                $queryBuilder->expr()->in(
                    'pid',
                    $queryBuilder->createNamedParameter($cleanedPageIds, Connection::PARAM_INT_ARRAY)
                )
            )
            ->execute()
            ->fetchColumn();
        return (bool)$count;
    }

    protected function overrideGetArguments(array $arguments)
    {
        $this->currentGetArguments = $_GET;
        $_GET['tx_sysnote_note'] = $arguments;
    }

    protected function revertGetArguments()
    {
        if (is_array($this->currentGetArguments)) {
            $_GET = $this->currentGetArguments;
        }
    }
}