owncloud/core

<?php
/**
 *
 * @copyright Copyright (c) 2020, ownCloud GmbH
 * @license AGPL-3.0
 *
 * This code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License, version 3,
 * as published by the Free Software Foundation.
 *
 * This program 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, version 3,
 * along with this program.  If not, see <http://www.gnu.org/licenses/>
 *
 */
namespace OC\License;

use OCP\License\AbstractLicense;

class BasicLicense extends AbstractLicense {
    private $rawLicense;
    private $org;
    private $expirationDateTimestamp = 0;  // to ensure an integer as expiration value
    private $rawCodes;
    private $codes;
    private $checksum;

    public function __construct(string $licenseKey) {
        $this->rawLicense = $licenseKey;

        $parts = \explode('-', $licenseKey);

        if (\count($parts) === 4) {
            // require 4 parts to initialize the object properly
            // otherwise the "isValid" will return false, and the "expirationTime" will be 0
            $this->org = $parts[0];
            $this->expirationDateTimestamp = \strtotime(\substr($parts[1], 0, 4) . '-' . \substr($parts[1], 4, 2) . '-' . \substr($parts[1], 6));
            $this->rawCodes = $parts[2];
            $this->codes = \str_split(\strtoupper($this->rawCodes), 8);
            $this->checksum = $parts[3];
        }
    }

    /**
     * @inheritDoc
     */
    public function getLicenseString(): string {
        return $this->rawLicense;
    }

    /**
     * @inheritDoc
     */
    public function isValid(): bool {
        $dateString = \date('Ymd', $this->expirationDateTimestamp);

        $checksum = \sprintf('%x', \crc32(\strtolower($this->org) . 'zz' . \strtolower($this->rawCodes) . 'zz' . $dateString));
        $dateCode = \strtoupper(\hash("crc32b", $dateString));

        return $checksum === $this->checksum && \in_array($dateCode, $this->codes);
    }

    /**
     * @inheritDoc
     */
    public function getExpirationTime(): int {
        // The license expires at the end of the expiration date.
        // So add 1 day of seconds to the expiration date timestamp.
        return $this->expirationDateTimestamp + (24 * 60 * 60);
    }

    /**
     * @inheritDoc
     */
    public function getType(): int {
        $hash = \strtoupper(\hash("crc32b", 'demo'));
        if (\in_array($hash, $this->codes)) {
            return ILicense::LICENSE_TYPE_DEMO;
        } else {
            return ILicense::LICENSE_TYPE_NORMAL;
        }
    }
}