<?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier <fabien@symfony.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Symfony\Component\Security\Http\Authenticator;

use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpFoundation\Response;
use Symfony\Component\Security\Core\Authentication\Token\TokenInterface;
use Symfony\Component\Security\Core\Exception\AuthenticationException;
use Symfony\Component\Security\Http\Authenticator\Passport\Passport;

/**
 * The interface for all authenticators.
 *
 * @author Ryan Weaver <ryan@symfonycasts.com>
 * @author Amaury Leroux de Lens <amaury@lerouxdelens.com>
 * @author Wouter de Jong <wouter@wouterj.nl>
 */
interface AuthenticatorInterface
{
    /**
     * Does the authenticator support the given Request?
     *
     * If this returns true, authenticate() will be called. If false, the authenticator will be skipped.
     *
     * Returning null means authenticate() can be called lazily when accessing the token storage.
     */
    public function supports(Request $request): ?bool;

    /**
     * Create a passport for the current request.
     *
     * The passport contains the user, credentials and any additional information
     * that has to be checked by the Symfony Security system. For example, a login
     * form authenticator will probably return a passport containing the user, the
     * presented password and the CSRF token value.
     *
     * You may throw any AuthenticationException in this method in case of error (e.g.
     * a UserNotFoundException when the user cannot be found).
     *
     * @throws AuthenticationException
     */
    public function authenticate(Request $request): Passport;

    /**
     * Create an authenticated token for the given user.
     *
     * If you don't care about which token class is used or don't really
     * understand what a "token" is, you can skip this method by extending
     * the AbstractAuthenticator class from your authenticator.
     *
     * @see AbstractAuthenticator
     *
     * @param Passport $passport The passport returned from authenticate()
     */
    public function createToken(Passport $passport, string $firewallName): TokenInterface;

    /**
     * Called when authentication executed and was successful!
     *
     * This should return the Response sent back to the user, like a
     * RedirectResponse to the last page they visited.
     *
     * If you return null, the current request will continue, and the user
     * will be authenticated. This makes sense, for example, with an API.
     */
    public function onAuthenticationSuccess(Request $request, TokenInterface $token, string $firewallName): ?Response;

    /**
     * Called when authentication executed, but failed (e.g. wrong username password).
     *
     * This should return the Response sent back to the user, like a
     * RedirectResponse to the login page or a 403 response.
     *
     * If you return null, the request will continue, but the user will
     * not be authenticated. This is probably not what you want to do.
     */
    public function onAuthenticationFailure(Request $request, AuthenticationException $exception): ?Response;
}
