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<?php

/**
 * Vonage Client Library for PHP
 *
 * @copyright Copyright (c) 2016-2020 Vonage, Inc. (http://vonage.com)
 * @license https://github.com/Vonage/vonage-php-sdk-core/blob/master/LICENSE.txt Apache License 2.0
 */

declare(strict_types=1);

namespace Vonage\Client\Credentials;

use Lcobucci\JWT\Configuration;
use Lcobucci\JWT\Signer\Key;
use Lcobucci\JWT\Signer\Key\InMemory;
use Lcobucci\JWT\Signer\Rsa\Sha256;
use Lcobucci\JWT\Token;
use Vonage\Application\Application;

use function base64_encode;
use function mt_rand;
use function time;

/**
 * @property mixed application
 */
class Keypair extends AbstractCredentials
{
    /**
     * @var Key
     */
    protected $key;

public function __construct($privateKey, $application = null)
    {
        $this->credentials['key'] = $privateKey;

if ($application) {
            if ($application instanceof Application) {
                $application = $application->getId();
            }

$this->credentials['application'] = $application;
        }

$this->key = InMemory::plainText($privateKey);
    }

/**
     * @return Key
     */
    public function getKey(): Key
    {
        return $this->key;
    }

public function generateJwt(array $claims = []): Token
    {
        $config = Configuration::forSymmetricSigner(new Sha256(), $this->key);

$exp = time() + 60;
        $iat = time();
        $jti = base64_encode((string)mt_rand());

if (isset($claims['exp'])) {
            $exp = $claims['exp'];

unset($claims['exp']);
        }

if (isset($claims['iat'])) {
            $iat = $claims['iat'];

unset($claims['iat']);
        }

if (isset($claims['jti'])) {
            $jti = $claims['jti'];

unset($claims['jti']);
        }

$builder = $config->builder();
        $builder->issuedAt((new \DateTimeImmutable())->setTimestamp($iat))
            ->expiresAt((new \DateTimeImmutable())->setTimestamp($exp))
            ->identifiedBy($jti);

if (isset($claims['nbf'])) {
            $builder->canOnlyBeUsedAfter((new \DateTimeImmutable())->setTimestamp($claims['nbf']));

unset($claims['nbf']);
        }

if (isset($this->credentials['application'])) {
            $builder->withClaim('application_id', $this->credentials['application']);
        }

if (isset($claims['sub'])) {
            $builder->relatedTo($claims['sub']);

unset($claims['sub']);
        }

if (!empty($claims)) {
            foreach ($claims as $claim => $value) {
                $builder->withClaim($claim, $value);
            }
        }

return $builder->getToken($config->signer(), $config->signingKey());
    }
}