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<?php
/**
 * OAuth 2.0 Password grant.
 *
 * @author      Alex Bilbie <hello@alexbilbie.com>
 * @copyright   Copyright (c) Alex Bilbie
 * @license     http://mit-license.org/
 *
 * @link        https://github.com/thephpleague/oauth2-server
 */

namespace League\OAuth2\Server\Grant;

use DateInterval;
use League\OAuth2\Server\Entities\ClientEntityInterface;
use League\OAuth2\Server\Entities\UserEntityInterface;
use League\OAuth2\Server\Exception\OAuthServerException;
use League\OAuth2\Server\Repositories\RefreshTokenRepositoryInterface;
use League\OAuth2\Server\Repositories\UserRepositoryInterface;
use League\OAuth2\Server\RequestAccessTokenEvent;
use League\OAuth2\Server\RequestEvent;
use League\OAuth2\Server\RequestRefreshTokenEvent;
use League\OAuth2\Server\ResponseTypes\ResponseTypeInterface;
use Psr\Http\Message\ServerRequestInterface;

/**
 * Password grant class.
 */
class PasswordGrant extends AbstractGrant
{
    /**
     * @param UserRepositoryInterface         $userRepository
     * @param RefreshTokenRepositoryInterface $refreshTokenRepository
     */
    public function __construct(
        UserRepositoryInterface $userRepository,
        RefreshTokenRepositoryInterface $refreshTokenRepository
    ) {
        $this->setUserRepository($userRepository);
        $this->setRefreshTokenRepository($refreshTokenRepository);

$this->refreshTokenTTL = new DateInterval('P1M');
    }

/**
     * {@inheritdoc}
     */
    public function respondToAccessTokenRequest(
        ServerRequestInterface $request,
        ResponseTypeInterface $responseType,
        DateInterval $accessTokenTTL
    ) {
        // Validate request
        $client = $this->validateClient($request);
        $scopes = $this->validateScopes($this->getRequestParameter('scope', $request, $this->defaultScope));
        $user = $this->validateUser($request, $client);

// Finalize the requested scopes
        $finalizedScopes = $this->scopeRepository->finalizeScopes($scopes, $this->getIdentifier(), $client, $user->getIdentifier());

// Issue and persist new access token
        $accessToken = $this->issueAccessToken($accessTokenTTL, $client, $user->getIdentifier(), $finalizedScopes);
        $this->getEmitter()->emit(new RequestAccessTokenEvent(RequestEvent::ACCESS_TOKEN_ISSUED, $request, $accessToken));
        $responseType->setAccessToken($accessToken);

// Issue and persist new refresh token if given
        $refreshToken = $this->issueRefreshToken($accessToken);

if ($refreshToken !== null) {
            $this->getEmitter()->emit(new RequestRefreshTokenEvent(RequestEvent::REFRESH_TOKEN_ISSUED, $request, $refreshToken));
            $responseType->setRefreshToken($refreshToken);
        }

return $responseType;
    }

/**
     * @param ServerRequestInterface $request
     * @param ClientEntityInterface  $client
     *
     * @throws OAuthServerException
     *
     * @return UserEntityInterface
     */
    protected function validateUser(ServerRequestInterface $request, ClientEntityInterface $client)
    {
        $username = $this->getRequestParameter('username', $request);

if (!\is_string($username)) {
            throw OAuthServerException::invalidRequest('username');
        }

$password = $this->getRequestParameter('password', $request);

if (!\is_string($password)) {
            throw OAuthServerException::invalidRequest('password');
        }

$user = $this->userRepository->getUserEntityByUserCredentials(
            $username,
            $password,
            $this->getIdentifier(),
            $client
        );

if ($user instanceof UserEntityInterface === false) {
            $this->getEmitter()->emit(new RequestEvent(RequestEvent::USER_AUTHENTICATION_FAILED, $request));

throw OAuthServerException::invalidCredentials();
        }

return $user;
    }

/**
     * {@inheritdoc}
     */
    public function getIdentifier()
    {
        return 'password';
    }
}