Add database management back to front-end and begin some refactoring

Here we go again boys...

app/Http/Middleware/Server/SubuserBelongsToServer.php

@@ -0,0 +1,70 @@
+<?php
+/**
+ * Pterodactyl - Panel
+ * Copyright (c) 2015 - 2017 Dane Everitt <dane@daneeveritt.com>.
+ *
+ * This software is licensed under the terms of the MIT license.
+ * https://opensource.org/licenses/MIT
+ */
+
+namespace Pterodactyl\Http\Middleware\Server;
+
+use Closure;
+use Illuminate\Contracts\Session\Session;
+use Pterodactyl\Exceptions\DisplayException;
+use Pterodactyl\Contracts\Repository\SubuserRepositoryInterface;
+use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;
+
+class SubuserBelongsToServer
+{
+    /**
+     * @var \Pterodactyl\Contracts\Repository\SubuserRepositoryInterface
+     */
+    protected $repository;
+
+    /**
+     * @var \Illuminate\Contracts\Session\Session
+     */
+    protected $session;
+
+    /**
+     * SubuserAccess constructor.
+     *
+     * @param \Illuminate\Contracts\Session\Session                        $session
+     * @param \Pterodactyl\Contracts\Repository\SubuserRepositoryInterface $repository
+     */
+    public function __construct(Session $session, SubuserRepositoryInterface $repository)
+    {
+        $this->repository = $repository;
+        $this->session = $session;
+    }
+
+    /**
+     * Determine if a user has permission to access and modify subuser.
+     *
+     * @param \Illuminate\Http\Request $request
+     * @param \Closure                 $next
+     * @return mixed
+     *
+     * @throws \Pterodactyl\Exceptions\DisplayException
+     * @throws \Pterodactyl\Exceptions\Repository\RecordNotFoundException
+     * @throws \Symfony\Component\HttpKernel\Exception\NotFoundHttpException
+     */
+    public function handle($request, Closure $next)
+    {
+        $server = $this->session->get('server_data.model');
+
+        $subuser = $this->repository->find($request->route()->parameter('subuser', 0));
+        if ($subuser->server_id !== $server->id) {
+            throw new NotFoundHttpException;
+        }
+
+        if ($request->method() === 'PATCH') {
+            if ($subuser->user_id === $request->user()->id) {
+                throw new DisplayException(trans('exceptions.subusers.editing_self'));
+            }
+        }
+
+        return $next($request);
+    }
+}