Symfony2 - 仅限匿名用户访问登录和注册页面

Question

我有一个登录表单的网站,在我成功登录后,我被重定向到索引.但是,当我单击后退按钮时,它仍然可以查看登录表单,这是不好的.我只希望只有匿名查看者才能访问登录表单,而不是已经登录的用户.在symfony2中有一个简单的方法吗？谢谢

这是我的安全:

    jms_security_extra:
    secure_all_services: false
    expressions: true

security:
    encoders:
        Mata\UserBundle\Entity\User: 
            algorithm:        sha1
            encode_as_base64: false
            iterations:   1

    role_hierarchy:
        ROLE_ADMIN:       ROLE_USER
        ROLE_SUPER_ADMIN: [ROLE_USER, ROLE_ADMIN, ROLE_ALLOWED_TO_SWITCH]


    providers:
        user_db:
            entity: { class: MataUserBundle:User,  property: username }

    firewalls:

        secured_area:
            pattern:    ^/
            anonymous: ~
            form_login:
                check_path: /login_check
                login_path: /login
            logout:
                path:   /logout
                target: /

    access_control:
    - { path: ^/login, roles: IS_AUTHENTICATED_ANONYMOUSLY }
    - { path: ^/, roles: ROLE_USER }

Answer 1

这可能不是最好或最适合的方式,但它是我能想出来的唯一方法.

在我的loginAction方法中,我这样做(参见$ secure变量).如果用户会话已通过身份验证,那么我会将其重定向到主页/索引页面.我不知道通过防火墙配置做到这一点的方法,因为我不相信登录页面会附加防火墙.

/**
 * @Route("/login", name="login")
 * @Template()
 */
public function loginAction()
{
    $request = $this->getRequest();
    $session = $request->getSession();

    // if the session is secured (user is logged in) 
    // then $secured will be an object with various user information.
    $secured = unserialize($session->get('_security_secured'));
    if ($secured) {
        return $this->redirect($this->generateUrl('home'));
    }

    // get the login error if there is one
    if ($request->attributes->has(SecurityContext::AUTHENTICATION_ERROR)) {
        $error = $request->attributes->get(SecurityContext::AUTHENTICATION_ERROR);
    } else {
        $error = $session->get(SecurityContext::AUTHENTICATION_ERROR);
    }

    return array(
        'last_username' => $session->get(SecurityContext::LAST_USERNAME),
        'error'         => $error,
        'embed'         => $request->isXmlHttpRequest()
    );
}