add LoginHandlerInterface

This is needed for overriding the Login handler.

src/Contract/Handler/LoginHandlerInterface.php

@@ -0,0 +1,16 @@
+<?php
+
+/**
+ * For the full copyright and license information, please view
+ * the LICENSE file that was distributed with this source code.
+ *
+ * @see https://github.com/ecphp
+ */
+
+declare(strict_types=1);
+
+namespace EcPhp\CasLib\Contract\Handler;
+
+interface LoginHandlerInterface extends HandlerInterface
+{
+}

src/Handler/Login.php

@@ -12,6 +12,7 @@
 namespace EcPhp\CasLib\Handler;
 
 use EcPhp\CasLib\Contract\Handler\HandlerInterface;
+use EcPhp\CasLib\Contract\Handler\LoginHandlerInterface;
 use EcPhp\CasLib\Exception\CasExceptionInterface;
 use EcPhp\CasLib\Exception\CasHandlerException;
 use EcPhp\CasLib\Utils\Uri;
@@ -20,7 +21,7 @@
 
 use function array_key_exists;
 
-final class Login extends Handler implements HandlerInterface
+final class Login extends Handler implements LoginHandlerInterface
 {
     public function handle(RequestInterface $request): ResponseInterface
     {