<?php
/**
 * Created by PhpStorm.
 * User: Administrator
 * Date: 2019/12/16
 * Time: 9:30
 */

namespace Yunshop\PhoneBill\service;


class ThirdRequestPhoneBill
{
    private $appSecret = '';

    private $appKey = '';

    public $callBackUrl = '';

    public $param = [];

    private $sign = '';

    public $serverRoot = '';


    public function __construct($appSecret, $appKey, $callBackUrl)
    {

        if (!empty($appSecret)) {
            $this->appSecret = $appSecret;
        }
        if (!empty($appKey)) {
            $this->appKey = $appKey;
        }
        if (!empty($callBackUrl)) {
            $this->callBackUrl = $callBackUrl;
        }

    }

    public function setParam($key, $value)
    {
        $this->param = array_merge($this->param, array($key => $value));
    }

    public function getSign()
    {
        $param = $this->filtrateParam();
        $sortParam = $this->sortParam($param);
        $sign = $this->createLinkstring($sortParam);
        $this->sign = $this->md5Sign($sign);

        return $this->sign;
    }

    /**
     * 过滤空值
     * @return array
     */
    private function filtrateParam()
    {
        $param = [];

        foreach ($this->param as $k => $v) {
            if ("" != $v) {
                $param[$k] = $v;
            }
        }
        return $param;

    }

    /**
     * 以键的ASCII从小到大排序
     * @param $param
     * @return mixed
     */
    private function sortParam($param)
    {
        ksort($param);
        reset($param);
        return $param;
    }

    /**
     * 转义
     * @param $para
     * @return bool|string
     */
    private function createLinkstring($para)
    {
        $arg = '';

        foreach ($para as $key => $val) {
            $arg .= $key . '=' . $val . '&';
        }

        //去掉最后一个&字符
        $arg = substr($arg, 0, count($arg) - 2);

        //如果存在转义字符，那么去掉转义
        if (get_magic_quotes_gpc()) {
            $arg = stripslashes($arg);
        }

        return $arg;
    }


    /**
     * 拼接私钥后加密
     * @param $prestr
     * @return string
     */
    private function md5Sign($prestr)
    {
        $prestr = $prestr . '&key=' . $this->appSecret;
        return strtoupper(md5($prestr));
    }

    public function getAppkey()
    {
        return $this->appKey;
    }


}