[BUGFIX] Fix the page not found handling for non existent languages

If a language is configured in the site config, but not present as a
language record in sys_language, we need to catch that issue and
redirect the page not found handling to the default language

Classes/Service/RoutingService.php

@@ -26,26 +26,20 @@ namespace SGalinski\SgRoutes\Service;
  *  This copyright notice MUST APPEAR in all copies of the script!
  ***************************************************************/
 
-use Psr\Http\Message\ResponseInterface;
 use TYPO3\CMS\Backend\Utility\BackendUtility;
-use TYPO3\CMS\Core\Cache\CacheManager;
 use TYPO3\CMS\Core\Context\Context;
 use TYPO3\CMS\Core\Controller\ErrorPageController;
 use TYPO3\CMS\Core\Database\ConnectionPool;
 use TYPO3\CMS\Core\Error\Http\PageNotFoundException;
-use TYPO3\CMS\Core\Http\MiddlewareDispatcher;
-use TYPO3\CMS\Core\Http\MiddlewareStackResolver;
 use TYPO3\CMS\Core\Http\Request;
-use TYPO3\CMS\Core\Http\ServerRequestFactory;
 use TYPO3\CMS\Core\Http\Uri;
-use TYPO3\CMS\Core\Package\PackageManager;
-use TYPO3\CMS\Core\Service\DependencyOrderingService;
 use TYPO3\CMS\Core\Utility\ExtensionManagementUtility;
 use TYPO3\CMS\Core\Utility\GeneralUtility;
 use TYPO3\CMS\Core\Utility\HttpUtility;
 use TYPO3\CMS\Extbase\Object\ObjectManager;
+use TYPO3\CMS\Frontend\ContentObject\ContentObjectRenderer;
 use TYPO3\CMS\Frontend\Controller\ErrorController;
-use TYPO3\CMS\Frontend\Http\RequestHandler;
+use TYPO3\CMS\Frontend\Page\PageRepository;
 
 /**
  * Class SGalinski\SgRoutes\Service\RoutingService
@@ -105,7 +99,9 @@ class RoutingService {
 
 			$configurationFound = FALSE;
 			if ($rootUid) {
-				$queryBuilder = GeneralUtility::makeInstance(ConnectionPool::class)->getQueryBuilderForTable('tx_sgroutes_domain_model_pagenotfoundhandling');
+				$queryBuilder = GeneralUtility::makeInstance(ConnectionPool::class)->getQueryBuilderForTable(
+					'tx_sgroutes_domain_model_pagenotfoundhandling'
+				);
 				$handling = $queryBuilder->select('function', 'header')
 					->from('tx_sgroutes_domain_model_pagenotfoundhandling')
 					->where(
@@ -123,14 +119,36 @@ class RoutingService {
 						) ||
 						$isFunctionStartsWithT3Prefix
 					) {
-						if ($isFunctionStartsWithT3Prefix) {
-							$function = (int) \substr($function, 14);
-						}
-						$function = 'index.php?id=' . $function;
-						$languageId = GeneralUtility::makeInstance(Context::class)->getPropertyFromAspect('language', 'id');
+						$GLOBALS['TSFE']->sys_page = GeneralUtility::makeInstance(PageRepository::class);
+						$contentObjectRenderer = GeneralUtility::makeInstance(
+							ContentObjectRenderer::class, $GLOBALS['TSFE']
+						);
+						$parameters = [
+							'parameter' => $function
+						];
+						$languageId = GeneralUtility::makeInstance(Context::class)->getPropertyFromAspect(
+							'language', 'id'
+						);
 						if ($languageId) {
-							$function .= '&L=' . $languageId;
+							$queryBuilder = GeneralUtility::makeInstance(
+								ConnectionPool::class
+							)->getQueryBuilderForTable('sys_language');
+							$languageCount = $queryBuilder->select('uid')
+								->from('sys_language')
+								->where(
+									$queryBuilder->expr()->eq(
+										'uid', $queryBuilder->createNamedParameter($languageId, \PDO::PARAM_INT)
+									)
+								)
+								->setMaxResults(1)->execute()->rowCount();
+							if ($languageCount > 0) {
+								$parameters['additionalParams'] = '&L=' . $languageId;
+							} else {
+								$parameters['additionalParams'] = '&L=0';
+							}
 						}
+
+						$function = $contentObjectRenderer->typoLink_URL($parameters);
 					}
 
 					$GLOBALS['TYPO3_CONF_VARS']['FE']['pageNotFound_handling'] = $function;
@@ -154,9 +172,9 @@ class RoutingService {
 			\header($GLOBALS['TYPO3_CONF_VARS']['FE']['pageNotFound_handling_statheader']);
 
 			$htaccessMessage = '';
-			if(
+			if (
 				$exception->getPrevious() instanceof \RuntimeException &&
-				\strpos($exception->getPrevious()->getMessage(), '401 Unauthorized')!==FALSE
+				\strpos($exception->getPrevious()->getMessage(), '401 Unauthorized') !== FALSE
 			) {
 				$htaccessMessage = ' The error page reported 401 Unauthorized, maybe there is a htaccess protection on it.';
 			}