Redirect to /setup if necessary

A user gets now redirected to /setup in case he is not logged in, the token
file exists and no config.ini was found.

refs #7163

application/controllers/AuthenticationController.php

@@ -33,6 +33,17 @@ class AuthenticationController extends ActionController
      */
     public function loginAction()
     {
+        if (@file_exists(Config::$configDir . '/setup.token')) {
+            try {
+                $config = Config::app()->toArray();
+                if (empty($config)) {
+                    $this->redirectNow(Url::fromPath('setup'));
+                }
+            } catch (NotReadableError $e) {
+                // Gets thrown in case of insufficient permission only
+            }
+        }
+
         $auth = $this->Auth();
         $this->view->form = $form = new LoginForm();
         $this->view->title = $this->translate('Icingaweb Login');

application/controllers/SetupController.php

@@ -0,0 +1,25 @@
+<?php
+// {{{ICINGA_LICENSE_HEADER}}}
+// {{{ICINGA_LICENSE_HEADER}}}
+
+use Icinga\Web\Controller\ActionController;
+
+class SetupController extends ActionController
+{
+    /**
+     * Whether the controller requires the user to be authenticated
+     *
+     * FALSE as the wizard uses token authentication
+     *
+     * @var bool
+     */
+    protected $requiresAuthentication = false;
+
+    /**
+     * Show the web wizard
+     */
+    public function indexAction()
+    {
+        
+    }
+}