ZF2 OAuth2 with JWT AcessToken response type

OAuth2ServerFactoryCryptoToken.php

<?php

namespace FooOAuth2\Factory;

use FooOAuth2\Storage\ClientCredentialsStorage;
use OAuth2\GrantType\ClientCredentials;
use OAuth2\GrantType\UserCredentials;
use OAuth2\ResponseType\JwtAccessToken as JwtAccessTokenResponseType;
use OAuth2\Server as OAuth2Server;
use OAuth2\Storage\JwtAccessToken as JwtAccessTokenStorage;
use Zend\ServiceManager\FactoryInterface;
use Zend\ServiceManager\ServiceLocatorInterface;
use ZF\OAuth2\Controller\Exception\RuntimeException;

class OAuth2ServerFactoryCryptoToken implements FactoryInterface
{
    public function createService(ServiceLocatorInterface $services)
    {
        $config = $services->get('Config');

        if (!isset($config['zf-oauth2']['storage']) || empty($config['zf-oauth2']['storage'])) {
            throw new RuntimeException(
                'The storage configuration [\'zf-oauth2\'][\'storage\'] for OAuth2 is missing'
            );
        }

        /** @var \OAuth2\Storage\PublicKeyInterface|\OAuth2\Storage\ScopeInterface $storage */
        $storage = $services->get($config['zf-oauth2']['storage']);
        $options = isset($config['zf-oauth2']['options']) ? $config['zf-oauth2']['options'] : array();

        /** @var \OAuth2\Server $server */
        $server = new OAuth2Server($storage, $options);

        $jwtAccessStorage = new JwtAccessTokenStorage($storage);
        $server->addStorage($jwtAccessStorage, 'access_token');

        $jwtAccessResponseType = new JwtAccessTokenResponseType($storage, null, null, $options);
        $server->addResponseType($jwtAccessResponseType);

        $server->addGrantType(new UserCredentials($services->get('FooOAuth2\Factory\UserCredentialsStorageFactory')));
        /** @var ClientCredentialsStorage $clientCredentialsStorage */
        $clientCredentialsStorage = $services->get('FooOAuth2\Factory\ClientCredentialsStorageFactory');
        $server->addGrantType(new ClientCredentials($clientCredentialsStorage, $options));
        $server->addStorage($clientCredentialsStorage);

        return $server;
    }
}