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<?php
/**
 * Copyright (C) 2021 Xibo Signage Ltd
 *
 * Xibo - Digital Signage - http://www.xibo.org.uk
 *
 * This file is part of Xibo.
 *
 * Xibo is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * any later version.
 *
 * Xibo is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with Xibo.  If not, see <http://www.gnu.org/licenses/>.
 */

namespace Xibo\OAuth;

use Carbon\Carbon;
use Lcobucci\JWT\Builder;
use Lcobucci\JWT\Signer\Key;
use Lcobucci\JWT\Signer\Rsa\Sha256;
use Lcobucci\JWT\Token;
use League\OAuth2\Server\CryptKey;
use League\OAuth2\Server\Entities\AccessTokenEntityInterface;
use League\OAuth2\Server\Entities\Traits\AccessTokenTrait;
use League\OAuth2\Server\Entities\Traits\EntityTrait;
use League\OAuth2\Server\Entities\Traits\TokenEntityTrait;

/**
 * Class AccessTokenEntity
 * @package Xibo\OAuth
 */
class AccessTokenEntity implements AccessTokenEntityInterface
{
    use AccessTokenTrait, TokenEntityTrait, EntityTrait;

/**
     * Generate a JWT from the access token
     *
     * @param CryptKey $privateKey
     *
     * @return Token
     */
    private function convertToJWT(CryptKey $privateKey)
    {
        $userId = $this->getUserIdentifier();

return (new Builder())
            ->issuedBy('info@xibosignage.com')
            ->permittedFor($this->getClient()->getIdentifier())
            ->identifiedBy($this->getIdentifier())
            ->issuedAt(Carbon::now()->toDateTimeImmutable())
            ->canOnlyBeUsedAfter(Carbon::now()->toDateTimeImmutable())
            ->expiresAt($this->getExpiryDateTime())
            ->relatedTo($userId)
            ->withClaim('scopes', $this->getScopes())
            ->getToken(new Sha256(), new Key($privateKey->getKeyPath()))
            ;
    }

/**
     * Generate a string representation from the access token
     */
    public function __toString()
    {
        return (string) $this->convertToJWT($this->privateKey);
    }
}