<?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\Guard;

use Symfony\Component\HttpFoundation\Request;

/**
 * The interface for all "guard" authenticators.
 *
 * The methods on this interface are called throughout the guard authentication
 * process to give you the power to control most parts of the process from
 * one location.
 *
 * @author Ryan Weaver <ryan@knpuniversity.com>
 * @author Amaury Leroux de Lens <amaury@lerouxdelens.com>
 */
interface AuthenticatorInterface extends GuardAuthenticatorInterface
{
    /**
     * Does the authenticator support the given Request?
     *
     * If this returns false, the authenticator will be skipped.
     *
     * @param Request $request
     *
     * @return bool
     */
    public function supports(Request $request);

    /**
     * Get the authentication credentials from the request and return them
     * as any type (e.g. an associate array).
     *
     * Whatever value you return here will be passed to getUser() and checkCredentials()
     *
     * For example, for a form login, you might:
     *
     *      return array(
     *          'username' => $request->request->get('_username'),
     *          'password' => $request->request->get('_password'),
     *      );
     *
     * Or for an API token that's on a header, you might use:
     *
     *      return array('api_key' => $request->headers->get('X-API-TOKEN'));
     *
     * @param Request $request
     *
     * @return mixed Any non-null value
     *
     * @throws \UnexpectedValueException If null is returned
     */
    public function getCredentials(Request $request);
}
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