<?php
/**
 * This lib file is part of item.
 *
 * @author   ctexthuang
 * @contact  ctexthuang@qq.com
 */

declare(strict_types=1);

namespace App\Lib\Crypto;

use Exception;
use Firebase\JWT\JWT;
use Firebase\JWT\Key;
use function Hyperf\Config\config;

class JwtCrypto implements CryptoInterface
{
    /**
     * 加密数据
     * @var string
     */
    public string $data = '';

    /**
     * 加密 key
     * @var string
     */
    private string $key;

    /**
     * 加密过期时间
     * @var int
     */
    private int $expire;

    /**
     * 构造函数 获取配置
     */
    public function __construct()
    {
        $this->key = config('system.jwt_key');
        $this->expire = (int)config('system.jwt_expire');
    }

    /**
     * jwt 加密
     * @return string
     */
    public function encrypt(): string
    {
        try {
            $time = time();
            $payload = [
                'iat' => $time, //签发时间
                'nbf' => $time, //(Not Before)：某个时间点后才能访问，比如设置time+30，表示当前时间30秒后才能使用
                'exp' => $time + $this->expire,
                'data' => json_decode($this->data,true),
            ];

            return JWT::encode($payload, $this->key,'HS256');
        } catch (Exception) {
            return '';
        }
    }

    /**
     * jwt 解密
     * @return array
     */
    public function decrypt(): array
    {
        try {
            return (array)JWT::decode($this->data, new Key($this->key, 'HS256'));
        } catch (Exception) {
            return [];
        }
    }
}