如何在api-platform中拦截graphql请求？

use ApiPlatform\Core\EventListener\EventPriorities;
use Symfony\Component\EventDispatcher\EventSubscriberInterface;
use Symfony\Component\HttpKernel\Event\RequestEvent;
use Symfony\Component\HttpKernel\KernelEvents;

class GraphQLRequestInterceptor implements EventSubscriberInterface
{
    public static function getSubscribedEvents()
    {
        return [
            KernelEvents::REQUEST => ['interceptGraphQLRequest', EventPriorities::PRE_READ],
        ];
    }

    public function interceptGraphQLRequest(RequestEvent $event)
    {
        // 在这里编写拦截和处理GraphQL请求的逻辑
    }
}

services:
    App\EventListener\GraphQLRequestInterceptor:
        tags:
            - { name: kernel.event_subscriber }

use Symfony\Component\HttpFoundation\Request;

public function interceptGraphQLRequest(RequestEvent $event)
{
    $request = $event->getRequest();

    // 检查请求是否为GraphQL请求
    if ($request->getPathInfo() === '/graphql' && $request->isMethod(Request::METHOD_POST)) {
        // 获取请求的内容
        $content = $request->getContent();

        // 在这里对GraphQL请求进行拦截和处理
        // 可以修改请求内容、添加额外的验证逻辑、记录日志等

        // 示例：修改请求内容
        $modifiedContent = $this->modifyGraphQLRequest($content);
        $request->setContent($modifiedContent);
    }
}

private function modifyGraphQLRequest(string $content): string
{
    // 在这里对GraphQL请求内容进行修改
    // 例如，添加额外的字段、修改查询参数等

    return $content;
}