Added redirects and middleware classes for login

src/Application/Auth/Middleware.php

@@ -0,0 +1,34 @@
+<?php
+
+/**
+ *  Informatica Eindproject D4p
+ *  6in3, Stedelijk Gymnasium Nijmegen
+ *  Docent: Hans de Wolf
+ *
+ *  ==================
+ *
+ *  Daniel Boutros,
+ *  Christiaan Goossens,
+ *  Jelmer Hinssen
+ */
+
+namespace Inforbank\Application\Auth;
+
+use Inforbank\Application;
+use Inforbank\Application\Helper\Redirect;
+
+class Middleware
+{
+    public function __invoke($request, $response, $next)
+    {
+        $container = Application::getContainer();
+
+        // Check for an existing session
+        if ($container->auth->isUserAuthenticated()) {
+            return $next($request, $response);
+        } else {
+            // Redirect to the login page
+            return Redirect::create($response, '/login');
+        }
+    }
+}