Symfony框架中间件的高级用法与实例演示

<?php

namespace AppMiddleware;

use SymfonyComponentHttpFoundationRequest;
use SymfonyComponentHttpFoundationResponse;

class SampleMiddleware
{
    public function handle(Request $request, Closure $next)
    {
        // 在中间件处理请求之前的逻辑
        // ...

        // 调用下一个中间件或路由处理器
        $response = $next($request);

        // 在中间件处理完响应之后的逻辑
        // ...

        return $response;
    }
}

services:  
    AppMiddlewareSampleMiddleware:
        tags:
            - { name: kernel.event_subscriber }

index:
    path: /
    controller: AppControllerDefaultController::indexAction
    middleware: ['AppMiddlewareSampleMiddleware']

framework:
    middleware: ['AppMiddlewareSampleMiddleware']

<?php

namespace AppMiddleware;

use SymfonyComponentHttpFoundationRequest;
use SymfonyComponentHttpFoundationResponse;
use SymfonyComponentHttpKernelExceptionHttpExceptionInterface;

class ExceptionHandlerMiddleware
{
    public function handle(Request $request, Closure $next)
    {
        try {
            $response = $next($request);
        } catch (HttpExceptionInterface $e) {
            $response = new Response($e->getMessage(), $e->getStatusCode());
        }

        return $response;
    }
}

<?php

namespace AppMiddleware;

use SymfonyComponentHttpFoundationRequest;
use SymfonyComponentHttpFoundationResponse;
use SymfonyComponentHttpKernelExceptionAccessDeniedHttpException;

class AdminMiddleware
{
    public function handle(Request $request, Closure $next)
    {
        // 检查用户是否已登录
        // ...

        // 如果未登录，则抛出AccessDeniedHttpException异常
        if (!$user->isLoggedIn()) {
            throw new AccessDeniedHttpException('Access Denied');
        }

        return $next($request);
    }
}

admin:
    path: /admin
    controller: AppControllerAdminController::indexAction
    middleware: ['AppMiddlewareAdminMiddleware']