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app/index/middleware/system/IndexInitialize.php

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+<?php
+declare (strict_types=1);
+// +----------------------------------------------------------------------
+// | swiftAdmin 极速开发框架 [基于WebMan开发]
+// +----------------------------------------------------------------------
+// | Copyright (c) 2020-2030 http://www.swiftadmin.net
+// +----------------------------------------------------------------------
+// | swiftAdmin.net High Speed Development Framework
+// +----------------------------------------------------------------------
+// | Author: meystack <coolsec@foxmail.com> Apache 2.0 License
+// +----------------------------------------------------------------------
+
+namespace app\index\middleware\system;
+use Webman\Http\Request;
+use Webman\Http\Response;
+use Webman\MiddlewareInterface;
+use function redirect;
+use function root_path;
+
+/**
+ * 前台应用中间件
+ * Class AppInitialize
+ * @package app\index\middleware\system
+ * @author meystack <
+ */
+
+class IndexInitialize implements MiddlewareInterface
+{
+    public function process(Request $request, callable $handler): Response
+    {
+        try {
+            if (saenv('site_status')) {
+                $content = file_get_contents(root_path('extend/conf/tpl') . 'close.tpl');
+                $content = str_replace('{text}',saenv('site_notice'),$content);
+                return \response($content, 503);
+            }
+        } catch (\Throwable $th) {
+            return \response('Web site has been closed', 503);
+        }
+
+        if (!is_file(root_path('extend/conf').'install.lock')) {
+            return redirect('/install/index');
+        }
+
+        return $handler($request);
+    }
+}