<?php

namespace service;

use think\Request;
use think\Config;
use service\JsonService;
use Firebase\JWT\JWT;

class JwtService
{
    /**
     * token
     * @var string
     */
    protected $token;

    protected $tokenKey;

    public function __construct($channel = "wap")
    {
        switch ($channel) {
            case "kefu":
                $this->tokenKey = Config::get('token.kefu_key');
                break;
            case "wap":
            default:
                $this->tokenKey = Config::get("token.app_key");
                break;
        }
    }

    /**
     * 获取token
     * @param int $id
     * @param string $type
     * @param array $params
     * @return array
     */
    public function getToken(int $id, array $params = [])
    {
        $host = Request()->host();
        $time = time();
        $exp_time = strtotime('+ 30day');
        $params += [
            'iss' => $host,
            'aud' => $host,
            'iat' => $time,
            'nbf' => $time,
            'exp' => $exp_time
        ];
        $params['jti'] = compact('id');
        $token = JWT::encode($params, $this->tokenKey);

        return $token;
    }

    /**
     * 解析token
     * @param string $jwt
     * @return array
     */
    public function parseToken(string $jwt)
    {
        $this->token = $jwt;
        list($headb64, $bodyb64, $cryptob64) = explode('.', $this->token);
        $payload = JWT::jsonDecode(JWT::urlsafeB64Decode($bodyb64));
        return $payload->jti->id;
    }

    /**
     * 验证token
     */
    public function verifyToken()
    {
        JWT::$leeway = 60;
        JWT::decode($this->token, $this->tokenKey, array('HS256'));

        $this->token = null;
    }
}