<?php

namespace app\service;

use app\model\Channel;
use think\exception\HttpResponseException;

class SignService extends BaseService
{


    public function __construct()
    {
        parent::__construct();
    }

    // 验签
    public function checkSign(array $post = [], string $sign = ""){
        $appkey = "";
        $timestamp = 0;
        if(isset($post['appkey']) && !empty($post['appkey'])){
            $appkey = $post['appkey'];
        }else{
            throw new HttpResponseException(_error('缺少appkey', 400));
        }

        if(strlen($appkey) != 16){
            throw new HttpResponseException(_error('错误appkey', 400));
        }

        if(isset($post['timestamp']) && !empty($post['timestamp'])){
            if($post['timestamp'] < time()-150 || $post['timestamp'] > time()+150){
                throw new HttpResponseException(_error('请求已过期', 400));
            }
            $timestamp = $post['timestamp'];
            unset($post['timestamp']);
        }else{
            throw new HttpResponseException(_error('缺少timestamp', 400));
        }

        if (empty($sign)){
            throw new HttpResponseException(_error('缺少sign', 400));
        }
        // 获取token
        $channel = Channel::where('appkey', $appkey)->where('status', 1)->where('is_deleted', 0)->find();
        if(!$channel){
            throw new HttpResponseException(_error('缺少appkey', 400));
        }
        $str = "appkey={$appkey}&timestamp={$timestamp}&token=".$channel['token'];
        if($sign != md5($str)){
            throw new HttpResponseException(_error('签名错误', 400));
        }
        return true;


    }


}