<?php
namespace App\Services;

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

/**
 * JWT服务管理-服务类
 * @author laravel开发员
 * @since 2020/11/11
 * @package App\Services
 */
class JwtService extends BaseService
{
    protected static $instance = null;
    protected $alg = 'HS256';

    /**
     * 静态入口
     */
    public static function make(){
        if(!self::$instance){
            self::$instance = new static();
        }

        return self::$instance;
    }

    public function encode($data, $iss='',$ttl=0)
    {
        $jwtTtl = env('JWT_TTL',3600);
        $jwtTtl = $jwtTtl>0?$jwtTtl:3600;
        $payload = array(
            "iss" => $iss,
            "aud" => '',
            "iat" => time(),
            "nbf" => time(),
            "exp" => time() + intval($ttl>0?$ttl:$jwtTtl),  // 有效期
            "data" => $data
        );
        return JWT::encode($payload, env('JWT_KEY'), $this->alg);
    }

    public function verifyToken($token)
    {
       try {
           $payload = JWT::decode($token, new Key(env('JWT_KEY'), $this->alg));
           if(empty($payload)){
               $this->error = 'TOKEN无效';
               return false;
           }

           if($payload->exp<=time()){
               $this->error = 'TOKEN已过期';
               return false;
           }

           return $payload->data;
       } catch (\Exception $exception){
           $this->error = $exception->getMessage();
           return false;
       }
    }
}