<?php

namespace App\Service;

use Firebase\JWT\JWT;
use Firebase\JWT\Key;

class TokenService
{
    const key = "t_nine"; //签发人  可空
    const validity = 8640000; //有效期
    const error = [
        -1 => "签名不正确",
        -2 => "签名在某个时间点之后才能用",
        -3 => "签名过期,重新登录",
        -4 => "未知错误"
    ];

    /**
     * Created by PhpStorm.
     * User: Administrator
     * Date: 2023/3/13
     * Time: 16:43
     * 获取token(登录以后)
     */
    public static function getToken($userId) :string{
        $token = array(
            "iat"=> time(), //签发时间
            "nbf"=> time() - 1, //生效时间  （立即生效）
            "exp"=> time() + self::validity,
            "data"=> [
                'user_id' => $userId
            ]
        );
        return JWT::encode($token,self::key,"HS256");
    }

    /**
     * Created by PhpStorm.
     * User: Administrator
     * Date: 2023/3/13
     * Time: 16:52
     * 解密token
     */
    public static function verifyToken($token){
        try {
            JWT::$leeway = 60;//当前时间减去60，把时间留点余地,同步其他服务器时间，解决nbf字段验证不通过问题
            $decoded = JWT::decode($token,new Key(self::key, "HS256")); //HS256方式，这里要和签发的时候对应

            $arr = (array)$decoded;
            return $arr['data']->user_id;
        } catch (\Firebase\JWT\SignatureInvalidException $e) { //签名不正确
            return -1;
        } catch (\Firebase\JWT\BeforeValidException $e) { // 签名在某个时间点之后才能用
            return -2;
        } catch (\Firebase\JWT\ExpiredException $e) { // token过期
            return -3;
        } catch (\Exception $e) { //其他错误
            return -4;
        }
    }
}