Fixed #303

Signed-off-by: James Cole <thegrumpydictator@gmail.com>

app/Http/Requests/ConfigurationRequest.php

@@ -0,0 +1,44 @@
+<?php
+/**
+ * ConfigurationRequest.php
+ * Copyright (C) 2016 thegrumpydictator@gmail.com
+ *
+ * This software may be modified and distributed under the terms
+ * of the MIT license.  See the LICENSE file for details.
+ */
+
+declare(strict_types = 1);
+
+namespace FireflyIII\Http\Requests;
+
+use Auth;
+
+/**
+ * Class ConfigurationRequest
+ *
+ *
+ * @package FireflyIII\Http\Requests
+ */
+class ConfigurationRequest extends Request
+{
+    /**
+     * @return bool
+     */
+    public function authorize()
+    {
+        // Only allow logged in users and admins
+        return Auth::check() && Auth::user()->hasRole('owner');
+    }
+
+    /**
+     * @return array
+     */
+    public function rules()
+    {
+        $rules = [
+            'single_user_mode' => 'between:0,1|numeric',
+        ];
+
+        return $rules;
+    }
+}