Bootstrap.php

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

use TYPO3\CMS\Backend\Utility\BackendUtility;
use TYPO3\CMS\Core\Utility\GeneralUtility;
use TYPO3\CMS\Core\Database\DatabaseConnection;

class Bootstrap {
    protected $extbaseConfiguration = array(
        'vendorName' => 'TYPO3\\CMS',
        'extensionName' => 'SysNote',
        'pluginName' => 'Note',
    );

    protected $currentGetArguments;

    protected $databaseConnection;

    public function __construct(DatabaseConnection $databaseConnection = NULL) {
        $this->databaseConnection = $databaseConnection ?: $GLOBALS['TYPO3_DB'];
    }

    public function run($controllerName, $actionName, array $arguments = array()) {
        if (!$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');
        $content = $extbaseBootstrap->run('', $this->extbaseConfiguration);
        $this->revertGetArguments();
        return $content;
    }

    protected function expectOutput(array $arguments = array()) {
        // no pids set
        if (!isset($arguments['pids']) || empty($arguments['pids']) || empty($GLOBALS['BE_USER']->user['uid'])) {
            return FALSE;
        }
        $pidList = $this->databaseConnection->cleanIntList($arguments['pids']);
        if (empty($pidList)) {
            return FALSE;
        }
        // check if there are records
        return ($this->databaseConnection->exec_SELECTcountRows('*', 'sys_note', 'pid IN (' . $pidList . ')' . BackendUtility::deleteClause('sys_note')) > 0);
    }

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

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