huangjingfen/pro_v3.5.1/app/http/middleware/InstallMiddleware.php

<?php
// +----------------------------------------------------------------------
// | Author: ScottPan Team 
// +----------------------------------------------------------------------

namespace app\http\middleware;


use app\Request;
use crmeb\interfaces\MiddlewareInterface;

/**
 * Class InstallMiddleware
 * @package app\http\middleware
 */
class InstallMiddleware implements MiddlewareInterface
{

    public function handle(Request $request, \Closure $next)
    {
        // CORS 预检请求不重定向，交给后续 AllowOriginMiddleware 返回 200 + CORS 头
        if (strtoupper($request->method()) === 'OPTIONS') {
            return $next($request);
        }
        //检测是否已安装CRMEB系统
        if (!is_dir(root_path() . "public/install/") || !is_file(root_path() . "public/install/install.lock")) {
            return redirect('/install/index');
        }

        return $next($request);
    }
}