Fix display of navbar links to admins, closes #1920

app/Services/Servers/GetUserPermissionsService.php

@@ -0,0 +1,37 @@
+<?php
+
+namespace Pterodactyl\Services\Servers;
+
+use Pterodactyl\Models\User;
+use Pterodactyl\Models\Server;
+
+class GetUserPermissionsService
+{
+    /**
+     * Returns the server specific permissions that a user has. This checks
+     * if they are an admin or a subuser for the server. If no permissions are
+     * found, an empty array is returned.
+     *
+     * @param \Pterodactyl\Models\Server $server
+     * @param \Pterodactyl\Models\User $user
+     * @return string[]
+     */
+    public function handle(Server $server, User $user)
+    {
+        if ($user->root_admin || $user->id === $server->owner_id) {
+            $permissions = ['*'];
+
+            if ($user->root_admin) {
+                $permissions[] = 'admin.websocket.errors';
+                $permissions[] = 'admin.websocket.install';
+            }
+
+            return $permissions;
+        }
+
+        /** @var \Pterodactyl\Models\Subuser|null $subuserPermissions */
+        $subuserPermissions = $server->subusers->where('user_id', $user->id)->first();
+
+        return $subuserPermissions ? $subuserPermissions->permissions : [];
+    }
+}