api add middleware: CheckSiteStatus

app/Http/Middleware/CheckSiteStatus.php

@@ -0,0 +1,27 @@
+<?php
+
+namespace App\Http\Middleware;
+
+use App\Exceptions\NexusException;
+use App\Models\Setting;
+use App\Models\User;
+use Closure;
+use Illuminate\Http\Request;
+use Symfony\Component\HttpFoundation\Response;
+
+class CheckSiteStatus
+{
+    /**
+     * Handle an incoming request.
+     *
+     * @param  \Closure(\Illuminate\Http\Request): (\Symfony\Component\HttpFoundation\Response)  $next
+     */
+    public function handle(Request $request, Closure $next): Response
+    {
+        $user = $request->user();
+        if ($user && $user->class < User::CLASS_ADMINISTRATOR && !Setting::getIsSiteOnline()) {
+            throw new NexusException(nexus_trans('misc.site_down_for_maintenance'));
+        }
+        return $next($request);
+    }
+}