如果匿名用户无权访问 URL,如何将他们重定向到自定义页面而不是登录页面?

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【中文标题】如果匿名用户无权访问 URL,如何将他们重定向到自定义页面而不是登录页面?【英文标题】:How do I redirect an anonymous user to custom page instead of the login page if they do not have access to a URL? 【发布时间】:2020-04-03 16:26:53 【问题描述】:

我为我的 Symfony 5 项目创建了一个登录表单。

当用户无权访问我的管理面板时,我想将匿名用户重定向到自定义页面(而不是登录页面)。

应用程序控制器:

// TestController.php
namespace App\Controller;

use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
use Symfony\Component\Routing\Annotation\Route;
use Sensio\Bundle\FrameworkExtraBundle\Configuration\IsGranted;

class TestController extends AbstractController

    /**
     * @Route("/admin/panel", name="test")
     * @IsGranted("ROLE_ADMIN")
     */
    public function index()
    

        return $this->render('test/index.html.twig', [
            'controller_name' => 'TestController',
        ]);
    

还有我的配置设置:

# security.yaml
security:
    encoders:
        App\Entity\Admin:
            algorithm: auto

    providers:
        admin:
            entity:
                class: App\Entity\Admin
                property: username

    firewalls:
        dev:
            pattern: ^/(_(profiler|wdt)|css|images|js)/
            security: false
        admin:
            pattern: ^/admin/

            guard:
                authenticators:
                    - App\Security\AdminLoginFormAuthenticator
            logout:
                path: app_logout
        main:
            anonymous: lazy

我的应用验证器:

// AdminLoginFormAuthenticator.php 
namespace App\Security;

use App\Entity\Admin;
use Doctrine\ORM\EntityManagerInterface;
use Symfony\Component\HttpFoundation\RedirectResponse;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\Routing\Generator\UrlGeneratorInterface;
use Symfony\Component\Security\Core\Authentication\Token\TokenInterface;
use Symfony\Component\Security\Core\Encoder\UserPasswordEncoderInterface;
use Symfony\Component\Security\Core\Exception\CustomUserMessageAuthenticationException;
use Symfony\Component\Security\Core\Exception\InvalidCsrfTokenException;
use Symfony\Component\Security\Core\Security;
use Symfony\Component\Security\Core\User\UserInterface;
use Symfony\Component\Security\Core\User\UserProviderInterface;
use Symfony\Component\Security\Csrf\CsrfToken;
use Symfony\Component\Security\Csrf\CsrfTokenManagerInterface;
use Symfony\Component\Security\Guard\Authenticator\AbstractFormLoginAuthenticator;
use Symfony\Component\Security\Guard\PasswordAuthenticatedInterface;
use Symfony\Component\Security\Http\Util\TargetPathTrait;

class AdminLoginFormAuthenticator extends AbstractFormLoginAuthenticator implements PasswordAuthenticatedInterface

    use TargetPathTrait;

    private $entityManager;
    private $urlGenerator;
    private $csrfTokenManager;
    private $passwordEncoder;

    public function __construct(EntityManagerInterface $entityManager, UrlGeneratorInterface $urlGenerator, CsrfTokenManagerInterface $csrfTokenManager, UserPasswordEncoderInterface $passwordEncoder)
    
        $this->entityManager = $entityManager;
        $this->urlGenerator = $urlGenerator;
        $this->csrfTokenManager = $csrfTokenManager;
        $this->passwordEncoder = $passwordEncoder;
    

    public function supports(Request $request)
    
        return 'app_admin' === $request->attributes->get('_route')
            && $request->isMethod('POST');
    

    public function getCredentials(Request $request)
    
        $credentials = [
            'username' => $request->request->get('username'),
            'password' => $request->request->get('password'),
            'csrf_token' => $request->request->get('_csrf_token'),
        ];
        $request->getSession()->set(
            Security::LAST_USERNAME,
            $credentials['username']
        );

        return $credentials;
    

    public function getUser($credentials, UserProviderInterface $userProvider)
    
        $token = new CsrfToken('authenticate', $credentials['csrf_token']);
        if (!$this->csrfTokenManager->isTokenValid($token)) 
            throw new InvalidCsrfTokenException();
        

        $user = $this->entityManager->getRepository(Admin::class)->findOneBy(['username' => $credentials['username']]);

        if (!$user) 
            // fail authentication with a custom error
            throw new CustomUserMessageAuthenticationException('...!');
        

        return $user;
    

    public function checkCredentials($credentials, UserInterface $user)
    
        return $this->passwordEncoder->isPasswordValid($user, $credentials['password']);
    

    /**
     * Used to upgrade (rehash) the user's password automatically over time.
     */
    public function getPassword($credentials): ?string
    
        return $credentials['password'];
    

    public function onAuthenticationSuccess(Request $request, TokenInterface $token, $providerKey)
    
        if ($targetPath = $this->getTargetPath($request->getSession(), $providerKey)) 
            return new RedirectResponse($targetPath);
        

        return new RedirectResponse($this->urlGenerator->generate('homepage'));
    

    protected function getLoginUrl()
    
        return $this->urlGenerator->generate('app_admin');
    

【问题讨论】:

【参考方案1】:

您的AdminLoginFormAuthenticator 扩展于AbstractFormLoginAuthenticator,其中包括以下内容:

   /**
     * Override to control what happens when the user hits a secure page
     * but isn't logged in yet.
     *
     * @return RedirectResponse
     */
    public function start(Request $request, AuthenticationException $authException = null)
    
        $url = $this->getLoginUrl();

        return new RedirectResponse($url);
    

读到这里,你需要做的事情就很明显了。

只需创建您自己的 start() 方法来控制如果他们无权访问会发生什么(例如,他们重定向到哪里)。

namespace App\Security;

class AdminLoginFormAuthenticator extends AbstractFormLoginAuthenticator implements PasswordAuthenticatedInterface

// the rest of your class

    public function start(Request $request, AuthenticationException $authException = null)
    
        $url = 'https:://example.com/whateverurlyouwanttoredirectto';

        return new RedirectResponse($url);
    

【讨论】:

谢谢。但我找不到 start() 方法。我编辑我的问题。 没有start() 方法。您必须自己创建它。它存在于您要扩展的类中。 错误:语法错误,文件意外结束,期望函数 (T_FUNCTION) 或 const (T_CONST) 呃...您的文件中有语法错误。您的 PHP 编辑器可能会告诉您它在哪里。

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