oauth2-server/examples/public/refresh_token.php

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

use League\OAuth2\Server\AuthorizationServer;
use League\OAuth2\Server\Exception\OAuthServerException;
use League\OAuth2\Server\Grant\RefreshTokenGrant;
use OAuth2ServerExamples\Repositories\AccessTokenRepository;
use OAuth2ServerExamples\Repositories\ClientRepository;
use OAuth2ServerExamples\Repositories\RefreshTokenRepository;
use OAuth2ServerExamples\Repositories\ScopeRepository;
use Psr\Http\Message\ResponseInterface;
use Psr\Http\Message\ServerRequestInterface;
use Slim\App;

include __DIR__ . '/../vendor/autoload.php';

$app = new App([
    'settings'    => [
        'displayErrorDetails' => true,
    ],
    AuthorizationServer::class => function () {
        // Init our repositories
        $clientRepository = new ClientRepository();
        $accessTokenRepository = new AccessTokenRepository();
        $scopeRepository = new ScopeRepository();
        $refreshTokenRepository = new RefreshTokenRepository();

        $privateKeyPath = 'file://' . __DIR__ . '/../private.key';

        // Setup the authorization server
        $server = new AuthorizationServer(
            $clientRepository,
            $accessTokenRepository,
            $scopeRepository,
            $privateKeyPath,
            'lxZFUEsBCJ2Yb14IF2ygAHI5N4+ZAUXXaSeeJm6+twsUmIen'
        );

        // Enable the refresh token grant on the server
        $grant = new RefreshTokenGrant($refreshTokenRepository);
        $grant->setRefreshTokenTTL(new \DateInterval('P1M')); // The refresh token will expire in 1 month

        $server->enableGrantType(
            $grant,
            new \DateInterval('PT1H') // The new access token will expire after 1 hour
        );

        return $server;
    },
]);

$app->post('/access_token', function (ServerRequestInterface $request, ResponseInterface $response) use ($app) {
    /* @var \League\OAuth2\Server\AuthorizationServer $server */
    $server = $app->getContainer()->get(AuthorizationServer::class);

    try {
        return $server->respondToAccessTokenRequest($request, $response);
    } catch (OAuthServerException $exception) {
        return $exception->generateHttpResponse($response);
    } catch (\Exception $exception) {
        $response->getBody()->write($exception->getMessage());

        return $response->withStatus(500);
    }
});

$app->run();