<?php
namespace app\middleware;

use Webman\Http\Request;
use Webman\Http\Response;
use Webman\MiddlewareInterface;

class CrossDomain implements MiddlewareInterface
{
//    public function process(Request $request, callable $next): Response
//    {
//        // 动态允许请求来源（支持携带Cookie）
//        $origin = $request->header('origin', '*');
//        $response = $next($request);
//
//        // 设置跨域响应头
//        $response->withHeaders([
//            'Access-Control-Allow-Origin'      => $origin,
//            'Access-Control-Allow-Methods'     => 'GET, POST, PUT, DELETE, OPTIONS',
//            'Access-Control-Allow-Headers'     => 'Content-Type, Authorization, X-Requested-With',
//            'Access-Control-Allow-Credentials' => 'true', // 允许携带Cookie
//            'Access-Control-Max-Age'           => 86400, // 预检请求缓存时间（秒）
//            'Vary'                             => 'Origin' // 避免缓存干扰
//        ]);
//
//        return $response;
//    }

    public function process(Request $request, callable $handler) : Response
    {
        // 如果是options请求则返回一个空响应，否则继续向洋葱芯穿越，并得到一个响应
        $response = $request->method() == 'OPTIONS' ? response('') : $handler($request);

        // 给响应添加跨域相关的http头
        $response->withHeaders([
            'Access-Control-Allow-Credentials' => 'true',
            'Access-Control-Allow-Origin' => $request->header('origin', '*'),
            'Access-Control-Allow-Methods' => $request->header('access-control-request-method', '*'),
            'Access-Control-Allow-Headers' => $request->header('access-control-request-headers', '*'),
            'Vary'                             => 'Origin' // 避免缓存干扰
        ]);

        return $response;
    }
}