template custom sur exception possible

src/Auth/Authenticator/OpenIDConnectAuthenticator.php

@@ -129,7 +129,11 @@ class OpenIDConnectAuthenticator extends AbstractAuthenticator implements Persis
             if ($user && $user->id === null) {
                 $json['time'] = time();
                 $this->logout($json);
-                throw new UnknownUserException;
+                $exception = new UnknownUserException();
+                if (!empty($user->get('username'))) {
+                    $exception->username = $user->get('username');
+                }
+                throw $exception;
             }
             if ($user) {
                 $json['time'] = time();

src/Auth/Identifier/OpenIDConnectIdentifier.php

@@ -108,6 +108,7 @@ class OpenIDConnectIdentifier extends AbstractIdentifier
                     ->set('auth_url', $this->getAuthUrl());
             } catch (PDOException|MissingConnectionException|RecordNotFoundException $e) {
                 return $Users->newEmptyEntity()
+                    ->set('username', $json ? ($json[$this->getConfig('username')] ?? null) : null)
                     ->set('auth_openid', true);
             }
         } elseif ($json) {

src/Auth/Identifier/UnknownUserException.php

@@ -19,6 +19,11 @@ use Throwable;
  */
 class UnknownUserException extends HttpException
 {
+    /**
+     * @var string|null
+     */
+    public $username = null;
+
     /**
      * Construct the exception. Note: The message is NOT binary safe.
      * @link https://php.net/manual/en/exception.construct.php

src/Error/AppExceptionRenderer.php

@@ -318,4 +318,25 @@ class AppExceptionRenderer extends WebExceptionRenderer
 
         return $code;
     }
+
+    /**
+     * Get template for rendering exception info.
+     *
+     * @param Throwable $exception Exception instance.
+     * @param string    $method    Method name.
+     * @param int       $code      Error code.
+     * @return string Template name
+     */
+    protected function _template(Throwable $exception, string $method, int $code): string
+    {
+        $customTemplate = Configure::read('AppExceptionRenderer.custom_templates.' . get_class($exception));
+        if ($customTemplate && !empty($customTemplate['template'])) {
+            if ($customTemplate['layout'] ?? false) {
+                $builder = $this->controller->viewBuilder();
+                $builder->setLayout($customTemplate['layout']);
+            }
+            return $customTemplate['template'];
+        }
+        return parent::_template($exception, $method, $code);
+    }
 }