DefaultConfiguration.php

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

use TYPO3\CMS\Install\Service\EnableFileService;

class DefaultConfiguration extends AbstractStepAction {

    public function execute() {
        $featureManager = $this->objectManager->get('TYPO3\\CMS\\Install\\Configuration\\FeatureManager');
        // Get best matching configuration presets
        $configurationValues = $featureManager->getBestMatchingConfigurationForAllFeatures();

        // let the admin user redirect to the distributions page on first login
        if (isset($this->postValues['values']['loaddistributions'])) {

            // update the admin backend user to show the distribution management on login
            $adminUserFirstLogin = array(
                'startModuleOnFirstLogin' => 'tools_ExtensionmanagerExtensionmanager->tx_extensionmanager_tools_extensionmanagerextensionmanager%5Baction%5D=distributions&tx_extensionmanager_tools_extensionmanagerextensionmanager%5Bcontroller%5D=List',
                'ucSetByInstallTool' => '1',
            );
            $this->getDatabaseConnection()->exec_UPDATEquery(
                    'be_users',
                    'admin=1',
                    array('uc' => serialize($adminUserFirstLogin))
            );
        }

        // Setting SYS/isInitialInstallationInProgress to FALSE marks this instance installation as complete
        $configurationValues['SYS/isInitialInstallationInProgress'] = FALSE;

        $configurationManager = $this->objectManager->get('TYPO3\\CMS\\Core\\Configuration\\ConfigurationManager');
        $configurationManager->setLocalConfigurationValuesByPathValuePairs($configurationValues);

        $session = $this->objectManager->get('TYPO3\\CMS\\Install\\Service\\SessionService');
        $session->destroySession();

        $formProtection = \TYPO3\CMS\Core\FormProtection\FormProtectionFactory::get(
            'TYPO3\\CMS\\Core\\FormProtection\\InstallToolFormProtection'
        );
        $formProtection->clean();

        if (!EnableFileService::isInstallToolEnableFilePermanent()) {
            EnableFileService::removeInstallToolEnableFile();
        }

        \TYPO3\CMS\Core\Utility\HttpUtility::redirect('../../../index.php', \TYPO3\CMS\Core\Utility\HttpUtility::HTTP_STATUS_303);
    }

    public function needsExecution() {
        $result = FALSE;
        if (isset($GLOBALS['TYPO3_CONF_VARS']['SYS']['isInitialInstallationInProgress'])
            && $GLOBALS['TYPO3_CONF_VARS']['SYS']['isInitialInstallationInProgress'] === TRUE
        ) {
            $result = TRUE;
        }
        return $result;
    }

    protected function executeAction() {
        $this->assignSteps();
        return $this->view->render();
    }
}