EventSubscriber 中的 getUser 实体

Question

我开始使用 symfony 构建我的第一个 Web 应用程序。在这个应用程序中，我获得了具有身份验证和多语言功能的用户管理。在用户数据库表中，每个用户都有一个 lang 列。我通过 _GET 参数以及通过运行的数据库值登录来更改应用程序的默认语言。现在我想通过EventSubscriber中的URL _GET参数切换语言来自动更改数据库中的值。不幸的是，我不知道如何在“onKernelRequest”函数中获取用户实体以将选择的语言保存在数据库中。更改语言的所有逻辑都在以下代码中完成：

<?php
namespace App\EventSubscriber;

use Symfony\Component\HttpFoundation\Session\SessionInterface;
use Symfony\Component\HttpKernel\Event\GetResponseEvent;
use Symfony\Component\HttpKernel\KernelEvents;
use Symfony\Component\EventDispatcher\EventSubscriberInterface;
use Symfony\Component\Security\Http\SecurityEvents;
use Symfony\Component\Security\Http\Event\InteractiveLoginEvent;

class LocaleSubscriber implements EventSubscriberInterface
{
    private $defaultLocale;
    private $allowedLangs;
    private $session;

    public function __construct(SessionInterface $session, $defaultLocale = 'de')
    {
        $this->defaultLocale = $defaultLocale;
        $this->allowedLangs = ['de', 'en'];
        $this->session = $session;
    }

    public function onInteractiveLogin(InteractiveLoginEvent $event)
    {
        $user = $event->getAuthenticationToken()->getUser();

        if (null !== $user->getLocale()) {
            $this->session->set('_locale', $user->getLocale());
        }
    }

    public function onKernelRequest(GetResponseEvent $event)
    {
        $request = $event->getRequest();
        if (!$request->hasPreviousSession()) {
            return;
        }

        // try to see if the locale has been set as a _locale routing parameter
        if ($locale = $request->attributes->get('_locale')) {
            $request->getSession()->set('_locale', $locale);
        } elseif(array_key_exists('_locale', $_GET) && array_search($_GET['_locale'], $this->allowedLangs) !== FALSE) {
            $request->setLocale($_GET['_locale']);
            $request->getSession()->set('_locale', $_GET['_locale']);
        } else {
            // if no explicit locale has been set on this request, use one from the session
            $request->setLocale($request->getSession()->get('_locale', $this->defaultLocale));
        }
    }

    public static function getSubscribedEvents()
    {
        return array(
            // must be registered before (i.e. with a higher priority than) the default Locale listener
            SecurityEvents::INTERACTIVE_LOGIN => array(array('onInteractiveLogin', 15)),
            KernelEvents::REQUEST => array(array('onKernelRequest', 20)),
        );
    }
}

预先感谢彼得

Answer 1

首先，我将拆LocaleSubscriber 分类并移动onKernelRequest到onInteractiveLogin单独的侦听器/订阅者 - 每个服务的依赖性更少。

onKernelRequest要在需要注入服务的情况下获取当前用户TokenStorage：

use Doctrine\ORM\EntityManagerInterface;
use Symfony\Component\Security\Core\Authentication\Token\Storage\TokenStorageInterface;

class LocaleSubscriber implements EventSubscriberInterface
{
    private $tokenStorage;
    private $em;

    public function __construct(
        TokenStorageInterface $tokenStorage, 
        EntityManagerInterface $em
    ) {
        $this->tokenStorage = $tokenStorage;
        $this->em = $em;
    }

    public function onKernelRequest(GetResponseEvent $event)
    {
        if (!$event->isMasterRequest()) {
            return;
        }

        if (!$token = $this->tokenStorage->getToken()) {
            return ;
        }

        if (!$token->isAuthenticated()) {
            return ;
        }

        if (!$user = $token->getUser()) {
            return ;
        }

        $request = $event->getRequest();

        // update user
        $user->setLocale($locale);

        $this->em->flush($user);

    }

}

请注意，这尚未经过测试。