<?php
/**
 *
 * (c) Copyright Ascensio System SIA 2020
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 */

namespace OCA\Onlyoffice;

use OCA\Onlyoffice\AppConfig;

/**
 * Token generator
 *
 * @package OCA\Onlyoffice
 */
class Crypt {

    /**
     * Application configuration
     *
     * @var AppConfig
     */
    private $config;

    /**
     * @param AppConfig $config - application configutarion
     */
    public function __construct(AppConfig $appConfig) {
        $this->config = $appConfig;
    }

    /**
     * Generate token for the object
     *
     * @param array $object - object to signature
     *
     * @return string
     */
    public function GetHash($object) {
        return \Firebase\JWT\JWT::encode($object, $this->config->GetSKey());
    }

    /**
     * Create an object from the token
     *
     * @param string $token - token
     *
     * @return array
     */
    public function ReadHash($token) {
        $result = null;
        $error = null;
        if ($token === null) {
            return [$result, "token is empty"];
        }
        try {
            $result = \Firebase\JWT\JWT::decode($token, $this->config->GetSKey(), array("HS256"));
        } catch (\UnexpectedValueException $e) {
            $error = $e->getMessage();
        }
        return [$result, $error];
    }
}