ConfigurationController.php

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

use TYPO3\CMS\Extensionmanager\Domain\Model\Extension;
use TYPO3\CMS\Extensionmanager\Exception\ExtensionManagerException;

class ConfigurationController extends AbstractController {

    protected $configurationItemRepository;

    protected $extensionRepository;

    public function showConfigurationFormAction(array $extension) {
        if (!array_key_exists('key', $extension)) {
            throw new ExtensionManagerException(
                'Extension key not found.',
                1359206803
            );
        }
        $configuration = $this->configurationItemRepository->findByExtensionKey($extension['key']);
        if ($configuration) {
            $this->view
                ->assign('configuration', $configuration)
                ->assign('extension', $extension);
        } else {
            $extension = $this->extensionRepository->findOneByCurrentVersionByExtensionKey($extension['key']);
            // Extension has no configuration and is a distribution
            if ($extension->getCategory() === Extension::DISTRIBUTION_CATEGORY) {
                $this->redirect('welcome', 'Distribution', NULL, array('extension' => $extension->getUid()));
            }
            throw new ExtensionManagerException('The extension ' . htmlspecialchars($extension['key']) . ' has no configuration.');
        }
    }

    public function saveAction(array $config, $extensionKey) {
        $this->saveConfiguration($config, $extensionKey);
        $extension = $this->extensionRepository->findOneByCurrentVersionByExtensionKey($extensionKey);
        // Different handling for distribution installation
        if ($extension instanceof Extension &&
            $extension->getCategory() === Extension::DISTRIBUTION_CATEGORY
        ) {
            $this->redirect('welcome', 'Distribution', NULL, array('extension' => $extension->getUid()));
        } else {
            $this->redirect('showConfigurationForm', NULL, NULL, array('extension' => array('key' => $extensionKey)));
        }
    }

    public function saveAndCloseAction(array $config, $extensionKey) {
        $this->saveConfiguration($config, $extensionKey);
        $this->redirect('index', 'List');
    }


    protected function emitAfterExtensionConfigurationWriteSignal(array $newConfiguration) {
        $this->signalSlotDispatcher->dispatch(__CLASS__, 'afterExtensionConfigurationWrite', array($newConfiguration, $this));
    }

    protected function saveConfiguration(array $config, $extensionKey) {
        $configurationUtility = $this->objectManager->get('TYPO3\\CMS\\Extensionmanager\\Utility\\ConfigurationUtility');
        $newConfiguration = $configurationUtility->getCurrentConfiguration($extensionKey);
        \TYPO3\CMS\Core\Utility\ArrayUtility::mergeRecursiveWithOverrule($newConfiguration, $config);
        $configurationUtility->writeConfiguration(
            $configurationUtility->convertValuedToNestedConfiguration($newConfiguration),
            $extensionKey
        );
        $this->emitAfterExtensionConfigurationWriteSignal($newConfiguration);
    }

}