Move error handling to dedicated controller instead of middleware

2 files changed, 46 insertions, 25 deletions

diff --git a/application/front/ShaarliMiddleware.php b/application/front/ShaarliMiddleware.php
index a2a3837b..c015c0c6 100644
--- a/application/front/ShaarliMiddleware.php
+++ b/application/front/ShaarliMiddleware.php
@@ -3,7 +3,6 @@
 namespace Shaarli\Front;
 
 use Shaarli\Container\ShaarliContainer;
-use Shaarli\Front\Exception\ShaarliFrontException;
 use Shaarli\Front\Exception\UnauthorizedException;
 use Slim\Http\Request;
 use Slim\Http\Response;
@@ -53,35 +52,12 @@ class ShaarliMiddleware
             $this->checkOpenShaarli($request, $response, $next);
 
             return $next($request, $response);
-        } catch (ShaarliFrontException $e) {
-            // Possible functional error
-            $this->container->pageBuilder->reset();
-            $this->container->pageBuilder->assign('message', nl2br($e->getMessage()));
-
-            $response = $response->withStatus($e->getCode());
-
-            return $response->write($this->container->pageBuilder->render('error', $this->container->basePath));
         } catch (UnauthorizedException $e) {
             $returnUrl = urlencode($this->container->environment['REQUEST_URI']);
 
             return $response->withRedirect($this->container->basePath . '/login?returnurl=' . $returnUrl);
-        } catch (\Throwable $e) {
-            // Unknown error encountered
-            $this->container->pageBuilder->reset();
-            if ($this->container->conf->get('dev.debug', false)) {
-                $this->container->pageBuilder->assign('message', $e->getMessage());
-                $this->container->pageBuilder->assign(
-                    'stacktrace',
-                    nl2br(get_class($e) .': '. PHP_EOL . $e->getTraceAsString())
-                );
-            } else {
-                $this->container->pageBuilder->assign('message', t('An unexpected error occurred.'));
-            }
-
-            $response = $response->withStatus(500);
-
-            return $response->write($this->container->pageBuilder->render('error', $this->container->basePath));
         }
+        // Other exceptions are handled by ErrorController
     }
 
     /**
diff --git a/application/front/controller/visitor/ErrorController.php b/application/front/controller/visitor/ErrorController.php
new file mode 100644
index 00000000..10aa84c8
--- /dev/null
+++ b/application/front/controller/visitor/ErrorController.php
@@ -0,0 +1,45 @@
+<?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'));
+    }
+}