Add underlying code to handle authenticating websocket credentials

app/Http/Controllers/Api/Remote/ValidateWebsocketController.php

@@ -0,0 +1,83 @@
+<?php
+
+namespace Pterodactyl\Http\Controllers\Api\Remote;
+
+use Illuminate\Http\Response;
+use Illuminate\Contracts\Cache\Repository;
+use Pterodactyl\Http\Controllers\Controller;
+use Pterodactyl\Repositories\Eloquent\UserRepository;
+use Pterodactyl\Repositories\Eloquent\ServerRepository;
+use Symfony\Component\HttpKernel\Exception\HttpException;
+use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;
+use Pterodactyl\Http\Requests\Api\Remote\AuthenticateWebsocketDetailsRequest;
+
+class ValidateWebsocketController extends Controller
+{
+    /**
+     * @var \Illuminate\Contracts\Cache\Repository
+     */
+    private $cache;
+
+    /**
+     * @var \Pterodactyl\Repositories\Eloquent\ServerRepository
+     */
+    private $serverRepository;
+
+    /**
+     * @var \Pterodactyl\Repositories\Eloquent\UserRepository
+     */
+    private $userRepository;
+
+    /**
+     * ValidateWebsocketController constructor.
+     *
+     * @param \Illuminate\Contracts\Cache\Repository $cache
+     * @param \Pterodactyl\Repositories\Eloquent\ServerRepository $serverRepository
+     * @param \Pterodactyl\Repositories\Eloquent\UserRepository $userRepository
+     */
+    public function __construct(Repository $cache, ServerRepository $serverRepository, UserRepository $userRepository)
+    {
+        $this->cache = $cache;
+        $this->serverRepository = $serverRepository;
+        $this->userRepository = $userRepository;
+    }
+
+    /**
+     * Route allowing the Wings daemon to validate that a websocket route request is
+     * valid and that the given user has permission to access the resource.
+     *
+     * @param \Pterodactyl\Http\Requests\Api\Remote\AuthenticateWebsocketDetailsRequest $request
+     * @param string $token
+     * @return \Illuminate\Http\Response
+     *
+     * @throws \Pterodactyl\Exceptions\Repository\RecordNotFoundException
+     */
+    public function __invoke(AuthenticateWebsocketDetailsRequest $request, string $token)
+    {
+        $server = $this->serverRepository->getByUuid($request->input('server_uuid'));
+        if (! $data = $this->cache->pull('ws:' . $token)) {
+            throw new NotFoundHttpException;
+        }
+
+        /** @var \Pterodactyl\Models\User $user */
+        $user = $this->userRepository->find($data['user_id']);
+        if (! $user->can('connect-to-ws', $server)) {
+            throw new HttpException(Response::HTTP_FORBIDDEN, 'You do not have permission to access this resource.');
+        }
+
+        /** @var \Pterodactyl\Models\Node $node */
+        $node = $request->attributes->get('node');
+
+        if (
+            $data['server_id'] !== $server->id
+            || $node->id !== $server->node_id
+            // @todo this doesn't work well in dev currently, need to look into this way more.
+            // @todo stems from some issue with the way requests are being proxied.
+            // || $data['request_ip'] !== $request->input('originating_request_ip')
+        ) {
+            throw new HttpException(Response::HTTP_BAD_REQUEST, 'The token provided is not valid for the requested resource.');
+        }
+
+        return Response::create('', Response::HTTP_NO_CONTENT);
+    }
+}