--- /dev/null
+<?php
+
+namespace Drupal\config\Controller;
+
+use Drupal\Core\Archiver\ArchiveTar;
+use Drupal\Core\Config\ConfigManagerInterface;
+use Drupal\Core\Config\StorageInterface;
+use Drupal\Core\DependencyInjection\ContainerInjectionInterface;
+use Drupal\Core\Diff\DiffFormatter;
+use Drupal\Core\Serialization\Yaml;
+use Drupal\Core\Url;
+use Drupal\system\FileDownloadController;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+use Symfony\Component\HttpFoundation\Request;
+
+/**
+ * Returns responses for config module routes.
+ */
+class ConfigController implements ContainerInjectionInterface {
+
+ /**
+ * The target storage.
+ *
+ * @var \Drupal\Core\Config\StorageInterface
+ */
+ protected $targetStorage;
+
+ /**
+ * The source storage.
+ *
+ * @var \Drupal\Core\Config\StorageInterface
+ */
+ protected $sourceStorage;
+
+ /**
+ * The configuration manager.
+ *
+ * @var \Drupal\Core\Config\ConfigManagerInterface
+ */
+ protected $configManager;
+
+ /**
+ * The file download controller.
+ *
+ * @var \Drupal\system\FileDownloadController
+ */
+ protected $fileDownloadController;
+
+ /**
+ * The diff formatter.
+ *
+ * @var \Drupal\Core\Diff\DiffFormatter
+ */
+ protected $diffFormatter;
+
+ /**
+ * {@inheritdoc}
+ */
+ public static function create(ContainerInterface $container) {
+ return new static(
+ $container->get('config.storage'),
+ $container->get('config.storage.sync'),
+ $container->get('config.manager'),
+ new FileDownloadController(),
+ $container->get('diff.formatter')
+ );
+ }
+
+ /**
+ * Constructs a ConfigController object.
+ *
+ * @param \Drupal\Core\Config\StorageInterface $target_storage
+ * The target storage.
+ * @param \Drupal\Core\Config\StorageInterface $source_storage
+ * The source storage
+ * @param \Drupal\system\FileDownloadController $file_download_controller
+ * The file download controller.
+ */
+ public function __construct(StorageInterface $target_storage, StorageInterface $source_storage, ConfigManagerInterface $config_manager, FileDownloadController $file_download_controller, DiffFormatter $diff_formatter) {
+ $this->targetStorage = $target_storage;
+ $this->sourceStorage = $source_storage;
+ $this->configManager = $config_manager;
+ $this->fileDownloadController = $file_download_controller;
+ $this->diffFormatter = $diff_formatter;
+ }
+
+ /**
+ * Downloads a tarball of the site configuration.
+ */
+ public function downloadExport() {
+ file_unmanaged_delete(file_directory_temp() . '/config.tar.gz');
+
+ $archiver = new ArchiveTar(file_directory_temp() . '/config.tar.gz', 'gz');
+ // Get raw configuration data without overrides.
+ foreach ($this->configManager->getConfigFactory()->listAll() as $name) {
+ $archiver->addString("$name.yml", Yaml::encode($this->configManager->getConfigFactory()->get($name)->getRawData()));
+ }
+ // Get all override data from the remaining collections.
+ foreach ($this->targetStorage->getAllCollectionNames() as $collection) {
+ $collection_storage = $this->targetStorage->createCollection($collection);
+ foreach ($collection_storage->listAll() as $name) {
+ $archiver->addString(str_replace('.', '/', $collection) . "/$name.yml", Yaml::encode($collection_storage->read($name)));
+ }
+ }
+
+ $request = new Request(['file' => 'config.tar.gz']);
+ return $this->fileDownloadController->download($request, 'temporary');
+ }
+
+ /**
+ * Shows diff of specified configuration file.
+ *
+ * @param string $source_name
+ * The name of the configuration file.
+ * @param string $target_name
+ * (optional) The name of the target configuration file if different from
+ * the $source_name.
+ * @param string $collection
+ * (optional) The configuration collection name. Defaults to the default
+ * collection.
+ *
+ * @return string
+ * Table showing a two-way diff between the active and staged configuration.
+ */
+ public function diff($source_name, $target_name = NULL, $collection = NULL) {
+ if (!isset($collection)) {
+ $collection = StorageInterface::DEFAULT_COLLECTION;
+ }
+ $diff = $this->configManager->diff($this->targetStorage, $this->sourceStorage, $source_name, $target_name, $collection);
+ $this->diffFormatter->show_header = FALSE;
+
+ $build = [];
+
+ $build['#title'] = t('View changes of @config_file', ['@config_file' => $source_name]);
+ // Add the CSS for the inline diff.
+ $build['#attached']['library'][] = 'system/diff';
+
+ $build['diff'] = [
+ '#type' => 'table',
+ '#attributes' => [
+ 'class' => ['diff'],
+ ],
+ '#header' => [
+ ['data' => t('Active'), 'colspan' => '2'],
+ ['data' => t('Staged'), 'colspan' => '2'],
+ ],
+ '#rows' => $this->diffFormatter->format($diff),
+ ];
+
+ $build['back'] = [
+ '#type' => 'link',
+ '#attributes' => [
+ 'class' => [
+ 'dialog-cancel',
+ ],
+ ],
+ '#title' => "Back to 'Synchronize configuration' page.",
+ '#url' => Url::fromRoute('config.sync'),
+ ];
+
+ return $build;
+ }
+
+}