Add support for filtering servers in client list-all endpoint

closes #1608

CHANGELOG.md

@@ -16,6 +16,9 @@ error encountered during creation or update.
 
 ### Added
 * Server listing view now displays the total used disk space for each server.
+* Client API endpoint to list all servers now supports an additional `?filter=subuser-of|all|admin|owner` parameter to
+return different groupings of servers. The default value is `subuser-of` which will include all of the user's servers
+that they are the owner of, as well as all servers they're a subuser of.
 
 ### Changed
 * Updated Paper egg to not download `server.properties` each time. [parkervcp/eggs#260](https://github.com/parkervcp/eggs/issues/260)

app/Http/Controllers/Api/Client/ClientController.php

@@ -35,7 +35,26 @@ class ClientController extends ClientApiController
      */
     public function index(GetServersRequest $request): array
     {
-        $servers = $this->repository->filterUserAccessServers($request->user(), User::FILTER_LEVEL_SUBUSER, config('pterodactyl.paginate.frontend.servers'));
+        // Check for the filter parameter on the request.
+        switch ($request->input('filter')) {
+            case 'all':
+                $filter = User::FILTER_LEVEL_ALL;
+                break;
+            case 'admin':
+                $filter = User::FILTER_LEVEL_ADMIN;
+                break;
+            case 'owner':
+                $filter = User::FILTER_LEVEL_OWNER;
+                break;
+            case 'subuser-of':
+            default:
+                $filter = User::FILTER_LEVEL_SUBUSER;
+                break;
+        }
+
+        $servers = $this->repository->filterUserAccessServers(
+            $request->user(), $filter, config('pterodactyl.paginate.frontend.servers')
+        );
 
         return $this->fractal->collection($servers)
             ->transformWith($this->getTransformer(ServerTransformer::class))