--- /dev/null
+<?php
+
+declare(strict_types=1);
+
+namespace Shaarli\Front\Controller\Visitor;
+
+use Shaarli\Front\Exception\ShaarliFrontException;
+use Slim\Http\Request;
+use Slim\Http\Response;
+
+/**
+ * Controller used to render the error page, with a provided exception.
+ * It is actually used as a Slim error handler.
+ */
+class ErrorController extends ShaarliVisitorController
+{
+ public function __invoke(Request $request, Response $response, \Throwable $throwable): Response
+ {
+ // Unknown error encountered
+ $this->container->pageBuilder->reset();
+
+ if ($throwable instanceof ShaarliFrontException) {
+ // Functional error
+ $this->assignView('message', nl2br($throwable->getMessage()));
+
+ $response = $response->withStatus($throwable->getCode());
+ } else {
+ // Internal error (any other Throwable)
+ if ($this->container->conf->get('dev.debug', false)) {
+ $this->assignView('message', $throwable->getMessage());
+ $this->assignView(
+ 'stacktrace',
+ nl2br(get_class($throwable) .': '. PHP_EOL . $throwable->getTraceAsString())
+ );
+ } else {
+ $this->assignView('message', t('An unexpected error occurred.'));
+ }
+
+ $response = $response->withStatus(500);
+ }
+
+
+ return $response->write($this->render('error'));
+ }
+}