<?php

namespace App\Services;


use http\Env\Request;
use Illuminate\Database\Eloquent\Scope;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Builder;
use DB;
use Illuminate\Support\Facades\Log;
use Illuminate\Support\Facades\Redis;

class PayServices
{
    //
    /**
     * 数字签名
     * server_id 商户id
     * token 商户token密钥
     * 价格，回调地址，异步回调，订单号,随机字符串,做md5加密
     * ksort之后拼接字符串，转换成小写,然后md5加密，
     * @param $data
     * @return bool
     */
    public function sign($data,$is_verfy=0){
        //必填参数
        $must_arr=[
            'token',
            'app_id',
            'money',
            'return_url',
            'notify_url',
            'out_trade_sn'
        ];
        foreach ($must_arr as $k=>$v)
        {
            if(!key_exists($v,$data))
            {
                return ['error'=>1,'msg'=>'签名参数缺少'];
            }
        }
        $data['money']=money_str($data['money'],2,'.','');

        //排序
        ksort($data);
        //
        $strkey = $this->toUrlParams($data);
        //转换小写
        $app_signature=strtolower($strkey);
        //Log::info("md5 before:".$app_signature);
        //MD5加密
        $app_signature = md5($app_signature);
        //Log::info("md5 end:".$app_signature);

        //回调验证
        if($is_verfy)
        {
            $app_signature=md5($data['token'].$app_signature);//token+之前的签名经行md5加密
        }
        return $app_signature;
    }
    public function toUrlParams( $params ){
        $string = '';
        if( !empty($params) ){
            $array = array();
            foreach( $params as $key => $value ){
                $array[] = $key.'='.$value;
            }
            $string = implode("&",$array);
        }
        return $string;
    }

    /**
     *
     * @param $data 参数携带token
     * @param $sign 过来的sign
     * @return bool 真验证成功，否失败
     */
    public function checkSign($data,$sign,$is_verfy=0){
        $site_sign=$this->sign($data,$is_verfy);
        if(is_array($site_sign))
        {
            return false;
        }

        if($site_sign!=$sign)
        {
            return false;
        }
        return true;
    }
}