Symfony事件监听

1. 参考链接1

2. 参考链接2

3. 监听请求、响应示例

   1. 修改[项目路径]\src\ListenAllBundle\Resources\config\services.yml

       services:
           listen_all:
               class: ListenAllBundle\Service\ListenAll
               # 这里可以传递服务、普通数据、参数, 如不明白可看：【symfony:symfony服务】一节
               #arguments: ["@service_id", "plain_value", "%parameter%"]
               tags:
                   # name: 名字-监听, event:事件-请求, method:方法-Service方法名 priority: 优先级-0~255
                   - {name: kernel.event_listener, event: kernel.request, method: onKernelRequest, priority: 255}
                   # name: 名字-监听, event:事件-响应, method:方法-Service方法名 priority: 优先级-0~255
                   - {name: kernel.event_listener, event: kernel.response, method: onKernelResponse, priority: 254}
      

   2. 修改[项目路径]\src\ListenAllBundle\Service\ListenAll.php

       <?php
      
       namespace ListenAllBundle\Service;
      
       use Symfony\Component\HttpFoundation\Response;
       use Symfony\Component\HttpKernel\Event\GetResponseEvent;
       use Symfony\Component\HttpKernel\Event\FilterResponseEvent;
      
       class ListenAll
       {
           /**
            * 请求时拒绝没有权限的用户访问
            */
           public function onKernelRequest(GetResponseEvent $event)
           {
               $request_method = $_SERVER['REQUEST_METHOD'];
               //在1=2条件下,Ajax请求直接被驳回
               if (1 === 2 && isset($_SERVER['HTTP_ORIGIN'])) {
                   $response = new Response();
                   $response->headers->set('Access-Control-Allow-Credentials', 'true');
                   $response->headers->set('Content-Type', "application/json;charset=UTF-8");
                   $response->headers->set('Access-Control-Allow-Origin', $_SERVER['HTTP_ORIGIN']);
                   $response->headers->set('Access-Control-Allow-Methods', 'POST,DELETE,PUT,GET,HEAD,PATCH,OPTIONS');
                   $response->setContent(json_encode(['code' => 403, 'data' =>[], 'msg' => 'Access denied.'], JSON_UNESCAPED_UNICODE));
                   $event->setResponse($response);
               }
           }
      
           /**
            * 响应时允许相同二级域名跨域
            */
           public function onKernelResponse(FilterResponseEvent $event)
           {
               $response = $event->getResponse();
               $host = $this->getParentDomain($_SERVER['HTTP_HOST']);
               if (isset($_SERVER['HTTP_ORIGIN'])) {
                   $origin = $this->getParentDomain($_SERVER['HTTP_ORIGIN']);
                   if ($host == $origin) {
                       $response->headers->set('Access-Control-Allow-Credentials', 'true');
                       $response->headers->set('Access-Control-Allow-Origin', $_SERVER['HTTP_ORIGIN']);
                       $response->headers->set('Access-Control-Allow-Methods', 'POST,DELETE,PUT,GET,HEAD,PATCH,OPTIONS');
                   }
               }
           }
      
           /**
            * 获取二级域名
            */
           private function getParentDomain(string $domain)
           {
               $domain = preg_replace('/^(.*)?:\/\//', '', $domain);
               $domain_arr = explode(':', $domain);
               $domain = $domain_arr[0];
               $is_ip = filter_var($domain, FILTER_VALIDATE_IP);
               if ($is_ip) {
                   return $domain;
               }
               $domain = trim($domain, '.');
               $domain_arr = explode('.', $domain);
               if (count($domain_arr) === 1) {
                   $domain = $domain_arr[0];
               } else {
                   array_shift($domain_arr);
                   $domain = implode('.', $domain_arr);
               }
               return $domain;
           }
       }