Auth logic is completed (signin, signup, logout), Added: Middlewares, RequireAuth middleware

core/middlewares/RequireAuth.php

@@ -0,0 +1,12 @@
+<?php
+
+class RequireAuth {
+    public function handle() {
+        if (!isset($_SESSION['user'])) {
+            header('Location: /auth/signin');
+            exit();
+        }
+
+        return true;
+    }
+}