BackendModuleController.php

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<?php
namespace TYPO3\CMS\Install\Controller;

class BackendModuleController extends \TYPO3\CMS\Extbase\Mvc\Controller\ActionController {

    protected $enableFileService;

    protected $formProtection;

    public function initializeAction() {
        $this->formProtection = \TYPO3\CMS\Core\FormProtection\FormProtectionFactory::get();
    }

    public function indexAction() {
        if ($this->enableFileService->checkInstallToolEnableFile()) {
            $this->redirect('sysext/install/Start/Install.php?install[context]=backend');
        } else {
            $this->forward('showEnableInstallToolButton');
        }
    }

    public function showEnableInstallToolButtonAction() {
        $token = $this->formProtection->generateToken('installTool');
        $this->view->assign('installToolEnableToken', $token);
    }

    public function enableInstallToolAction($installToolEnableToken) {
        if (!$this->formProtection->validateToken($installToolEnableToken, 'installTool')) {
            throw new \RuntimeException('Given form token was not valid', 1369161225);
        }
        $this->enableFileService->createInstallToolEnableFile();
        $this->forward('index');
    }

    protected function redirect($uri) {
        \TYPO3\CMS\Core\Utility\HttpUtility::redirect($uri);
    }
}