service-visit/app/service/wxpay.js

'use strict';

const xmlreader = require('xmlreader');
const fs = require('fs');
const Service = require('egg').Service;

class WxPayService extends Service {

  constructor(ctx) {
    super(ctx);
    this.abc = 'wxa9997e40dea04213';
  }

  // 把金额转为分
  async getmoney(money) {
    return parseFloat(money) * 100;
  }

  // 随机字符串产生函数
  async createNonceStr() {
    return Math.random().toString(36).substr(2, 15);
  }

  // 时间戳产生函数
  async createTimeStamp() {
    return parseInt(new Date().getTime() / 1000) + '';
  }

  // 签名加密算法
  async paysignjsapi(appid, body, mch_id, nonce_str, notify_url, out_trade_no, spbill_create_ip, total_fee, trade_type, mchkey, openid) {
    const ret = {
      appid,
      mch_id,
      nonce_str,
      body,
      notify_url,
      out_trade_no,
      spbill_create_ip,
      total_fee,
      trade_type,
      openid,
    };
    let string = await this.raw(ret);
    const key = mchkey;
    string = string + '&key=' + key;
    const crypto = require('crypto');
    return crypto.createHash('md5').update(string, 'utf8').digest('hex')
      .toUpperCase();
  }
  // 签名加密算法,第二次的签名
  async paysignjsapifinal(appid, mch_id, prepayid, noncestr, timestamp, mchkey) {
    const ret = {
      appId: appid,
      timeStamp: timestamp,
      nonceStr: noncestr,
      package: 'prepay_id=' + prepayid,
      signType: 'MD5',
    };
    let string = await this.raw(ret);
    const key = mchkey;
    string = string + '&key=' + key;
    const crypto = require('crypto');
    return crypto.createHash('md5').update(string, 'utf8').digest('hex')
      .toUpperCase();
  }
  async getXMLNodeValue(xml) {
    // var tmp = xml.split("<"+node_name+">");
    // console.log('tmp',tmp);
    // var _tmp = tmp[1].split("</"+node_name+">");
    // console.log('_tmp',_tmp);
    // return _tmp[0];
    const parseObj = await new Promise(function(resolve) {
      xmlreader.read(xml, function(errors, response) {
        if (errors !== null) {
          console.log(errors);
          return;
        }
        const prepay_id = response.xml.prepay_id.text();
        resolve(prepay_id);
      });
    });
    return parseObj;
  }

  async raw(args) {
    let keys = Object.keys(args);
    keys = keys.sort();
    const newArgs = {};
    keys.forEach(function(key) {
      newArgs[key] = args[key];
    });
    let string = '';
    for (const k in newArgs) {
      string += '&' + k + '=' + newArgs[k];
    }
    string = string.substr(1);
    return string;
  }

}

module.exports = WxPayService;