Add ServerTransferringException, use is_null

app/Exceptions/Http/Server/ServerTransferringException.php

@@ -0,0 +1,14 @@
+<?php
+
+namespace Pterodactyl\Exceptions\Http\Server;
+
+use Illuminate\Http\Response;
+use Symfony\Component\HttpKernel\Exception\HttpException;
+
+class ServerTransferringException extends HttpException
+{
+    public function __construct()
+    {
+        parent::__construct(Response::HTTP_CONFLICT, 'Server is currently being transferred.');
+    }
+}

app/Http/Controllers/Api/Client/Servers/WebsocketController.php

@@ -61,7 +61,7 @@ class WebsocketController extends ClientApiController
         $permissions = $this->permissionsService->handle($server, $user);
 
         $node = null;
-        if ($server->transfer !== null) {
+        if (! is_null($server->transfer)) {
             // Check if the user has permissions to receive transfer logs.
             if (! in_array('admin.websocket.transfer', $permissions)) {
                 throw new HttpException(Response::HTTP_FORBIDDEN, 'You do not have permission to view transfer logs');

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

@@ -12,6 +12,7 @@ use Pterodactyl\Exceptions\Http\HttpForbiddenException;
 use Pterodactyl\Repositories\Eloquent\ServerRepository;
 use Pterodactyl\Services\Servers\GetUserPermissionsService;
 use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;
+use Pterodactyl\Exceptions\Http\Server\ServerTransferringException;
 use Symfony\Component\HttpKernel\Exception\BadRequestHttpException;
 use Pterodactyl\Http\Requests\Api\Remote\SftpAuthenticationFormRequest;
 use Symfony\Component\HttpKernel\Exception\TooManyRequestsHttpException;
@@ -110,9 +111,14 @@ class SftpAuthenticationController extends Controller
             }
         }
 
-        // Remeber, for security purposes, only reveal the existence of the server to people that
+        // Prevent SFTP access to servers that are being transferred.
+        if (! is_null($server->transfer)) {
+            throw new ServerTransferringException();
+        }
+
+        // Remember, for security purposes, only reveal the existence of the server to people that
         // have provided valid credentials, and have permissions to know about it.
-        if ($server->installed !== 1 || $server->suspended || $server->transfer !== null) {
+        if ($server->installed !== 1 || $server->suspended) {
             throw new BadRequestHttpException(
                 'Server is not installed or is currently suspended.'
             );
@@ -132,7 +138,7 @@ class SftpAuthenticationController extends Controller
      * @param \Illuminate\Http\Request $request
      * @return string
      */
-    protected function throttleKey(Request $request)
+    protected function throttleKey(Request $request): string
     {
         $username = explode('.', strrev($request->input('username', '')));
 

app/Http/Middleware/Api/Client/Server/AuthenticateServerAccess.php

@@ -79,7 +79,7 @@ class AuthenticateServerAccess
                 }
             }
 
-            if ($server->transfer !== null) {
+            if (! is_null($server->transfer)) {
                 if (! $user->root_admin || ($user->root_admin && ! $request->routeIs($this->except))) {
                     throw new ConflictHttpException('Server is currently being transferred.');
                 }

app/Http/Middleware/Server/AccessingValidServer.php

@@ -9,6 +9,7 @@ use Illuminate\Contracts\Routing\ResponseFactory;
 use Illuminate\Contracts\Config\Repository as ConfigRepository;
 use Pterodactyl\Contracts\Repository\ServerRepositoryInterface;
 use Symfony\Component\HttpKernel\Exception\ConflictHttpException;
+use Pterodactyl\Exceptions\Http\Server\ServerTransferringException;
 use Symfony\Component\HttpKernel\Exception\AccessDeniedHttpException;
 
 class AccessingValidServer
@@ -80,9 +81,9 @@ class AccessingValidServer
             return $this->response->view('errors.installing', [], 409);
         }
 
-        if ($server->transfer !== null) {
+        if (! is_null($server->transfer)) {
             if ($isApiRequest) {
-                throw new ConflictHttpException('Server is currently being transferred.');
+                throw new ServerTransferringException();
             }
 
             return $this->response->view('errors.transferring', [], 409);

app/Services/Servers/SuspensionService.php

@@ -7,6 +7,7 @@ use Pterodactyl\Models\Server;
 use Illuminate\Database\ConnectionInterface;
 use Pterodactyl\Repositories\Wings\DaemonServerRepository;
 use Symfony\Component\HttpKernel\Exception\ConflictHttpException;
+use Pterodactyl\Exceptions\Http\Server\ServerTransferringException;
 
 class SuspensionService
 {
@@ -58,8 +59,8 @@ class SuspensionService
         }
 
         // Check if the server is currently being transferred.
-        if ($server->transfer !== null) {
+        if (! is_null($server->transfer)) {
-            throw new ConflictHttpException('Server is currently being transferred');
+            throw new ServerTransferringException();
         }
 
         $this->connection->transaction(function () use ($action, $server) {
@@ -68,7 +69,7 @@ class SuspensionService
             ]);
 
             // Only send the suspension request to wings if the server is not currently being transferred.
-            if ($server->transfer === null) {
+            if (is_null($server->transfer)) {
                 $this->daemonServerRepository->setServer($server)->suspend($action === self::ACTION_UNSUSPEND);
             }
         });

app/Transformers/Api/Client/ServerTransformer.php

@@ -72,7 +72,7 @@ class ServerTransformer extends BaseClientTransformer
             ],
             'is_suspended' => $server->suspended,
             'is_installing' => $server->installed !== 1,
-            'is_transferring' => $server->transfer !== null,
+            'is_transferring' => ! is_null($server->transfer),
         ];
     }
 

resources/scripts/routers/ServerRouter.tsx

@@ -66,7 +66,7 @@ const ServerRouter = ({ match, location }: RouteComponentProps<{ id: string }>)
         getServer(match.params.id)
             .catch(error => {
                 if (error.response?.status === 409) {
-                    if (error.response.data?.errors[0]?.detail?.includes('transfer')) {
+                    if (error.response.data?.errors[0]?.code === 'ServerTransferringException') {
                         setTransferring(true);
                     } else {
                         setInstalling(true);

resources/views/admin/servers/view/manage.blade.php

@@ -72,7 +72,7 @@
                         <form action="{{ route('admin.servers.view.manage.suspension', $server->id) }}" method="POST">
                             {!! csrf_field() !!}
                             <input type="hidden" name="action" value="suspend" />
-                            <button type="submit" class="btn btn-warning @if($server->transfer !== null) disabled @endif">Suspend Server</button>
+                            <button type="submit" class="btn btn-warning @if(! is_null($server->transfer)) disabled @endif">Suspend Server</button>
                         </form>
                     </div>
                 </div>
@@ -97,7 +97,7 @@
             </div>
         @endif
 
-        @if($server->transfer === null)
+        @if(is_null($server->transfer))
             <div class="col-sm-4">
                 <div class="box box-success">
                     <div class="box-header with-border">