微信小程序接入扫呗支付

九饼 - 2022-07-13 08:37:20

实际支付之前，需要先请求预充值信息，获取订单流水号，实际支付的时候需要带上这个参数，等到支付成功，订单流水号会直接返给支付结果回调通知地址。扫呗官网：http://help.lcsw.cn/xrmpic/ti...

总体流程图如下：

请求预充值信息

getOrderNo() {
    return new Promise((resolve, reject) => {
      myAjax('getOrderNo','POST' {
        payAmount: 1 // 表示充值一分钱
      }, (res) => {
        this.setData({
          orderNo: res.orderNo // 表示返回的订单流水号
        }, () => {
          resolve()
        })
      })
    })
  }

去充值，由于别的页面也需要购买或充值，这里封装成了公共方法publicPay，引入

const { publicPay } = require('../../util/public.js')

 async goRecharge() {
    await this.getOrderNo() // 需要先等返回订单流水号
    let param = {
      orderNo: this.data.orderNo,
      total_fee: this.data.amountSelected.toString() // 金额，单位分
    }
    publicPay(param, (res, paySuccess) => {
      if (paySuccess) {
        // 表示支付成功
      }
    })
  },

publicPay方法需要先引入md5，代码如下：
const md5 = require('../libs/md5/md5')

export const publicPay = (param, cb) => {

  const sub_appid = 'wx543795375437543' // 微信小程序的appid

  const open_id = wx.getStorageSync('openid') // 使用微信支付时为必填项，请提前获取

  const sb_http = 'https://pay.lcsw.cn/lcsw/pay/100/minipay' // 扫呗支付接口地址

  const sb_key = '5034217reywrruewi23143e75b' // 扫呗提供给商户的密钥，一种token

  // 以下是必填参数

  const pay_ver = '100' // 扫呗版本号，请到扫呗官网查看当前版本号
  const pay_type = '010' // 支付方式，010 代表微信
  const service_id = '015' // 接口类型，请到扫呗官网查看当前接口类型

  const merchant_no = '85343242342341' // 扫呗提供的商户号
  const terminal_id = '13065307' // 扫呗提供的终端号

  const terminal_trace = param.orderNo // 订单流水号

  const terminal_time = getDateTimeToString() // 交易时间，这里是公共方法，下面有介绍

  const total_fee = param.total_fee // 金额单位:分

  // 必传参数拼接生成 key_sign

  let mustParamString = `pay_ver=${pay_ver}&pay_type=${pay_type}&service_id=${service_id}&merchant_no=${merchant_no}&terminal_id=${terminal_id}&terminal_trace=${terminal_trace}&terminal_time=${terminal_time}&total_fee=${total_fee}&access_token=${sb_key}`

  let key_sign = md5.hexMD5(mustParamString) // 需要md5加密

  // 以下是非必填参数

  let order_body = '本次支付的订单描述，选填'

  let notify_url = 'https://xxx.xxx.com/xxx' // 支付结果回调通知地址，跟后端约好

  let params = {
    pay_ver,
    pay_type,
    service_id,
    merchant_no,
    terminal_id,
    terminal_trace,
    terminal_time,
    total_fee,
    sub_appid,
    open_id,
    key_sign,
    order_body,
    notify_url
  }

  wx.request({
    url: sb_http,
    method: 'POST',
    data: params,
    dataType: 'json',
    success: function (res) {
    // 把扫呗返回的结果，放进微信支付需要的参数
      wx.requestPayment({
        timeStamp: res.data.timeStamp,
        nonceStr: res.data.nonceStr,
        package: res.data.package_str,
        signType: 'MD5',
        paySign: res.data.paySign,
        success(resPay) {
          // 支付成功的回调
          cb(resPay, 'paySuccess')
        },
        fail(resPayFail) {
          cb(resPayFail)
        }
      })

    },
    fail: function (err) {
      if (err) {
        cb(err)
      }
    }
  })

}

支付所需要的交易时间格式，yyyyMMddHHmmss，方法如下：

getDateTimeToString() {
  var date_ = new Date();
  var year = date_.getFullYear();
  var month = date_.getMonth() + 1;
  var day = date_.getDate();
  if (month < 10) month = "0" + month;
  if (day < 10) day = "0" + day;

  var hours = date_.getHours();
  var mins = date_.getMinutes();
  var secs = date_.getSeconds();
  var msecs = date_.getMilliseconds();
  if (hours < 10) hours = "0" + hours;
  if (mins < 10) mins = "0" + mins;
  if (secs < 10) secs = "0" + secs;
  if (msecs < 10) secs = "0" + msecs;
  return year + month + day + hours  + mins + secs;
}

md5.js 代码如下：

/* 
 * A JavaScript implementation of the RSA Data Security, Inc. MD5 Message 
 * Digest Algorithm, as defined in RFC 1321. 
 * Version 1.1 Copyright (C) Paul Johnston 1999 - 2002. 
 * Code also contributed by Greg Holt 
 * See http://pajhome.org.uk/site/legal.html for details. 
 */

/* 
 * Add integers, wrapping at 2^32. This uses 16-bit operations internally 
 * to work around bugs in some JS interpreters. 
 */
function safe_add(x, y) {
  var lsw = (x & 0xFFFF) + (y & 0xFFFF)
  var msw = (x >> 16) + (y >> 16) + (lsw >> 16)
  return (msw << 16) | (lsw & 0xFFFF)
}

/* 
 * Bitwise rotate a 32-bit number to the left. 
 */
function rol(num, cnt) {
  return (num << cnt) | (num >>> (32 - cnt))
}

/* 
 * These functions implement the four basic operations the algorithm uses. 
 */
function cmn(q, a, b, x, s, t) {
  return safe_add(rol(safe_add(safe_add(a, q), safe_add(x, t)), s), b)
}
function ff(a, b, c, d, x, s, t) {
  return cmn((b & c) | ((~b) & d), a, b, x, s, t)
}
function gg(a, b, c, d, x, s, t) {
  return cmn((b & d) | (c & (~d)), a, b, x, s, t)
}
function hh(a, b, c, d, x, s, t) {
  return cmn(b ^ c ^ d, a, b, x, s, t)
}
function ii(a, b, c, d, x, s, t) {
  return cmn(c ^ (b | (~d)), a, b, x, s, t)
}

/* 
 * Calculate the MD5 of an array of little-endian words, producing an array 
 * of little-endian words. 
 */
function coreMD5(x) {
  var a = 1732584193
  var b = -271733879
  var c = -1732584194
  var d = 271733878

  for (var i = 0; i < x.length; i += 16) {
    var olda = a
    var oldb = b
    var oldc = c
    var oldd = d

    a = ff(a, b, c, d, x[i + 0], 7, -680876936)
    d = ff(d, a, b, c, x[i + 1], 12, -389564586)
    c = ff(c, d, a, b, x[i + 2], 17, 606105819)
    b = ff(b, c, d, a, x[i + 3], 22, -1044525330)
    a = ff(a, b, c, d, x[i + 4], 7, -176418897)
    d = ff(d, a, b, c, x[i + 5], 12, 1200080426)
    c = ff(c, d, a, b, x[i + 6], 17, -1473231341)
    b = ff(b, c, d, a, x[i + 7], 22, -45705983)
    a = ff(a, b, c, d, x[i + 8], 7, 1770035416)
    d = ff(d, a, b, c, x[i + 9], 12, -1958414417)
    c = ff(c, d, a, b, x[i + 10], 17, -42063)
    b = ff(b, c, d, a, x[i + 11], 22, -1990404162)
    a = ff(a, b, c, d, x[i + 12], 7, 1804603682)
    d = ff(d, a, b, c, x[i + 13], 12, -40341101)
    c = ff(c, d, a, b, x[i + 14], 17, -1502002290)
    b = ff(b, c, d, a, x[i + 15], 22, 1236535329)

    a = gg(a, b, c, d, x[i + 1], 5, -165796510)
    d = gg(d, a, b, c, x[i + 6], 9, -1069501632)
    c = gg(c, d, a, b, x[i + 11], 14, 643717713)
    b = gg(b, c, d, a, x[i + 0], 20, -373897302)
    a = gg(a, b, c, d, x[i + 5], 5, -701558691)
    d = gg(d, a, b, c, x[i + 10], 9, 38016083)
    c = gg(c, d, a, b, x[i + 15], 14, -660478335)
    b = gg(b, c, d, a, x[i + 4], 20, -405537848)
    a = gg(a, b, c, d, x[i + 9], 5, 568446438)
    d = gg(d, a, b, c, x[i + 14], 9, -1019803690)
    c = gg(c, d, a, b, x[i + 3], 14, -187363961)
    b = gg(b, c, d, a, x[i + 8], 20, 1163531501)
    a = gg(a, b, c, d, x[i + 13], 5, -1444681467)
    d = gg(d, a, b, c, x[i + 2], 9, -51403784)
    c = gg(c, d, a, b, x[i + 7], 14, 1735328473)
    b = gg(b, c, d, a, x[i + 12], 20, -1926607734)

    a = hh(a, b, c, d, x[i + 5], 4, -378558)
    d = hh(d, a, b, c, x[i + 8], 11, -2022574463)
    c = hh(c, d, a, b, x[i + 11], 16, 1839030562)
    b = hh(b, c, d, a, x[i + 14], 23, -35309556)
    a = hh(a, b, c, d, x[i + 1], 4, -1530992060)
    d = hh(d, a, b, c, x[i + 4], 11, 1272893353)
    c = hh(c, d, a, b, x[i + 7], 16, -155497632)
    b = hh(b, c, d, a, x[i + 10], 23, -1094730640)
    a = hh(a, b, c, d, x[i + 13], 4, 681279174)
    d = hh(d, a, b, c, x[i + 0], 11, -358537222)
    c = hh(c, d, a, b, x[i + 3], 16, -722521979)
    b = hh(b, c, d, a, x[i + 6], 23, 76029189)
    a = hh(a, b, c, d, x[i + 9], 4, -640364487)
    d = hh(d, a, b, c, x[i + 12], 11, -421815835)
    c = hh(c, d, a, b, x[i + 15], 16, 530742520)
    b = hh(b, c, d, a, x[i + 2], 23, -995338651)

    a = ii(a, b, c, d, x[i + 0], 6, -198630844)
    d = ii(d, a, b, c, x[i + 7], 10, 1126891415)
    c = ii(c, d, a, b, x[i + 14], 15, -1416354905)
    b = ii(b, c, d, a, x[i + 5], 21, -57434055)
    a = ii(a, b, c, d, x[i + 12], 6, 1700485571)
    d = ii(d, a, b, c, x[i + 3], 10, -1894986606)
    c = ii(c, d, a, b, x[i + 10], 15, -1051523)
    b = ii(b, c, d, a, x[i + 1], 21, -2054922799)
    a = ii(a, b, c, d, x[i + 8], 6, 1873313359)
    d = ii(d, a, b, c, x[i + 15], 10, -30611744)
    c = ii(c, d, a, b, x[i + 6], 15, -1560198380)
    b = ii(b, c, d, a, x[i + 13], 21, 1309151649)
    a = ii(a, b, c, d, x[i + 4], 6, -145523070)
    d = ii(d, a, b, c, x[i + 11], 10, -1120210379)
    c = ii(c, d, a, b, x[i + 2], 15, 718787259)
    b = ii(b, c, d, a, x[i + 9], 21, -343485551)

    a = safe_add(a, olda)
    b = safe_add(b, oldb)
    c = safe_add(c, oldc)
    d = safe_add(d, oldd)
  }
  return [a, b, c, d]
}

/* 
 * Convert an array of little-endian words to a hex string. 
 */
function binl2hex(binarray) {
  var hex_tab = "0123456789abcdef"
  var str = ""
  for (var i = 0; i < binarray.length * 4; i++) {
    str += hex_tab.charAt((binarray[i >> 2] >> ((i % 4) * 8 + 4)) & 0xF) +
      hex_tab.charAt((binarray[i >> 2] >> ((i % 4) * 8)) & 0xF)
  }
  return str
}

/* 
 * Convert an array of little-endian words to a base64 encoded string. 
 */
function binl2b64(binarray) {
  var tab = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"
  var str = ""
  for (var i = 0; i < binarray.length * 32; i += 6) {
    str += tab.charAt(((binarray[i >> 5] << (i % 32)) & 0x3F) |
      ((binarray[i >> 5 + 1] >> (32 - i % 32)) & 0x3F))
  }
  return str
}

/* 
 * Convert an 8-bit character string to a sequence of 16-word blocks, stored 
 * as an array, and append appropriate padding for MD4/5 calculation. 
 * If any of the characters are >255, the high byte is silently ignored. 
 */
function str2binl(str) {
  var nblk = ((str.length + 8) >> 6) + 1 // number of 16-word blocks  
  var blks = new Array(nblk * 16)
  for (var i = 0; i < nblk * 16; i++) blks[i] = 0
  for (var i = 0; i < str.length; i++)
    blks[i >> 2] |= (str.charCodeAt(i) & 0xFF) << ((i % 4) * 8)
  blks[i >> 2] |= 0x80 << ((i % 4) * 8)
  blks[nblk * 16 - 2] = str.length * 8
  return blks
}

/* 
 * Convert a wide-character string to a sequence of 16-word blocks, stored as 
 * an array, and append appropriate padding for MD4/5 calculation. 
 */
function strw2binl(str) {
  var nblk = ((str.length + 4) >> 5) + 1 // number of 16-word blocks  
  var blks = new Array(nblk * 16)
  for (var i = 0; i < nblk * 16; i++) blks[i] = 0
  for (var i = 0; i < str.length; i++)
    blks[i >> 1] |= str.charCodeAt(i) << ((i % 2) * 16)
  blks[i >> 1] |= 0x80 << ((i % 2) * 16)
  blks[nblk * 16 - 2] = str.length * 16
  return blks
}

/* 
 * External interface 
 */
function hexMD5(str) { return binl2hex(coreMD5(str2binl(str))) }
function hexMD5w(str) { return binl2hex(coreMD5(strw2binl(str))) }
function b64MD5(str) { return binl2b64(coreMD5(str2binl(str))) }
function b64MD5w(str) { return binl2b64(coreMD5(strw2binl(str))) }
/* Backward compatibility */
function calcMD5(str) { return binl2hex(coreMD5(str2binl(str))) }
module.exports = {
  hexMD5: hexMD5
}

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