微信小程序篇（微信小程序的支付）

時間  2019-11-13
標籤 微信 程序 支付 简体版
原文   原文鏈接

微信小程序的支付和微信公衆號的支付是相似的，對比起來還比公衆號支付簡單了一些，咱們只須要調用微信的統一下單接口獲取prepay_id以後咱們在調用微信的支付便可。node

今天咱們來封裝通常node的支付接口！！！算法

首先調用統一下單接口咱們須要知道一些信息json

var bookingNo = 'davdian' + this.createNonceStr() + this.createTimeStamp()
    var deferred = Q.defer()  
    var appid = config.appId  
    var nonce_str = this.createNonceStr()  
    var timeStamp = this.createTimeStamp()  
    var url = "https://api.mch.weixin.qq.com/pay/unifiedorder"  
    var formData = "<xml>"  
    formData += "<appid>" + appid + "</appid>" //appid  
    formData += "<attach>" + attach + "</attach>" //附加數據  
    formData += "<body>" + body + "</body>"  
    formData += "<mch_id>" + mch_id + "</mch_id>" //商戶號  
    formData += "<nonce_str>" + nonce_str + "</nonce_str>" //隨機字符串，不長於32位。  
    formData += "<notify_url>" + notify_url + "</notify_url>"  
    formData += "<openid>" + openid + "</openid>"  
    formData += "<out_trade_no>" + bookingNo + "</out_trade_no>"  
    formData += "<spbill_create_ip>61.50.221.43</spbill_create_ip>"  
    formData += "<total_fee>" + total_fee + "</total_fee>"  
    formData += "<trade_type>JSAPI</trade_type>"  
    formData += "<sign>" + this.paysignjsapi(appid, attach, body, mch_id, nonce_str, notify_url, openid, bookingNo, '61.50.221.43', total_fee, 'JSAPI') + "</sign>"  
    formData += "</xml>"  
    var self = this
    request({  
      url: url,  
      method: 'POST',  
      body: formData  
    }, function(err, response, body) {  
      if (!err && response.statusCode == 200) {  
        var prepay_id = self.getXMLNodeValue('prepay_id', body.toString("utf-8")) 
        var tmp = prepay_id.split('[')  
        var tmp1 = tmp[2].split(']')  
        //簽名  
        var _paySignjs = self.paysignjs(appid, nonce_str, 'prepay_id=' + tmp1[0], 'MD5', timeStamp)  
        var args = {  
          appId: appid,  
          timeStamp: timeStamp,  
          nonceStr: nonce_str,  
          signType: "MD5",  
          package: tmp1[0],  
          paySign: _paySignjs  
        }
        deferred.resolve(args)  
      } else {  
        console.log(body)  
      } 
    })  
    return deferred.promise

這個是一個統一下單接口的代碼，咱們須要appid小程序公衆號id，mch_id商戶號id,openid小程序的惟一標實,key支付用的密碼，剩下的參數都是訂單的信息和價格之類的，本人require進q模塊使用promise，這個因人而異，能夠根據本身須要來。咱們須要請求https://api.mch.weixin.qq.com/pay/unifiedorder接口小程序

注意：這裏咱們傳遞的formdata是一個xml而不是json微信小程序

而後咱們須要簽名方法，這裏咱們須要封裝兩個方法，一個是簽名方法調用統一下單接口會用到，另外一個是調用小程序支付用到api

統一下單接口sign：promise

var ret = {  
      appid: appid,  
      attach: attach,  
      body: body,  
      mch_id: mch_id,  
      nonce_str: nonce_str,  
      notify_url: notify_url,  
      openid: openid,  
      out_trade_no: out_trade_no,  
      spbill_create_ip: spbill_create_ip,  
      total_fee: total_fee,  
      trade_type: trade_type  
    }  
    var string = this.raw(ret)  
    string = string + '&key=' + key  
    var crypto = require('crypto')  
    var sign = crypto.createHash('md5').update(string, 'utf8').digest('hex')  
    return sign.toUpperCase()

支付sign：微信

var ret = {  
        appId: appid,  
        nonceStr: nonceStr,  
        package: package,  
        signType: signType,  
        timeStamp: timeStamp  
    }  
    var string = this.raw(ret)  
    string = string + '&key=' + key  
    var sign = crypto.createHash('md5').update(string, 'utf8').digest('hex')  
    return sign.toUpperCase()

注意加密的時候咱們獲取的是string而不是一個json，因此咱們須要吧json轉換成string，代碼以下：app

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

統一下單接口返回的是帶有prepay_id的xml，因此咱們須要一個方法進行解析，代碼以下：dom

var tmp = xml.split("<" + node_name + ">")  
    var _tmp = tmp[1].split("</" + node_name + ">")  
    return _tmp[0]

最後咱們只須要把這些鏈接到一塊兒就是能夠獲取全部微信支付所需參數，代碼以下：

//微信小程序支付封裝,暫支持md5加密，不支持sha1
/**
***create order by jianchep 2016/11/22     
 **/
var config = require('../config/weapp.js')
var Q = require("q")  
var request = require("request")  
var crypto = require('crypto')  
var ejs = require('ejs')
var fs = require('fs')  
var key = config.key
module.exports = {
  // 獲取prepay_id
  getXMLNodeValue: function(node_name, xml) {  
    var tmp = xml.split("<" + node_name + ">")  
    var _tmp = tmp[1].split("</" + node_name + ">")  
    return _tmp[0]  
  },
  // object-->string
  raw: function(args) {  
    var keys = Object.keys(args)  
    keys = keys.sort()  
    var newArgs = {}  
    keys.forEach(function(key) {  
        newArgs[key] = args[key]  
    })  
    var string = ''  
    for (var k in newArgs) {  
        string += '&' + k + '=' + newArgs[k]  
    }  
    string = string.substr(1)  
    return string  
  },  
    // 隨機字符串產生函數  
  createNonceStr: function() {  
      return Math.random().toString(36).substr(2, 15)  
  },  
  // 時間戳產生函數  
  createTimeStamp: function() {  
      return parseInt(new Date().getTime() / 1000) + ''  
  },
  // 支付md5加密獲取sign
  paysignjs: function(appid, nonceStr, package, signType, timeStamp) {  
    var ret = {  
        appId: appid,  
        nonceStr: nonceStr,  
        package: package,  
        signType: signType,  
        timeStamp: timeStamp  
    }  
    var string = this.raw(ret)  
    string = string + '&key=' + key  
    var sign = crypto.createHash('md5').update(string, 'utf8').digest('hex')  
    return sign.toUpperCase()  
  },
  // 統一下單接口加密獲取sign
  paysignjsapi: function(appid, attach, body, mch_id, nonce_str, notify_url, openid, out_trade_no, spbill_create_ip, total_fee, trade_type) {  
    var ret = {  
      appid: appid,  
      attach: attach,  
      body: body,  
      mch_id: mch_id,  
      nonce_str: nonce_str,  
      notify_url: notify_url,  
      openid: openid,  
      out_trade_no: out_trade_no,  
      spbill_create_ip: spbill_create_ip,  
      total_fee: total_fee,  
      trade_type: trade_type  
    }  
    var string = this.raw(ret)  
    string = string + '&key=' + key  
    var crypto = require('crypto')  
    var sign = crypto.createHash('md5').update(string, 'utf8').digest('hex')  
    return sign.toUpperCase()  
  },
  // 下單接口
  order: function(attach, body, mch_id, openid, total_fee, notify_url) {
    var bookingNo = 'davdian' + this.createNonceStr() + this.createTimeStamp()
    var deferred = Q.defer()  
    var appid = config.appId  
    var nonce_str = this.createNonceStr()  
    var timeStamp = this.createTimeStamp()  
    var url = "https://api.mch.weixin.qq.com/pay/unifiedorder"  
    var formData = "<xml>"  
    formData += "<appid>" + appid + "</appid>" //appid  
    formData += "<attach>" + attach + "</attach>" //附加數據  
    formData += "<body>" + body + "</body>"  
    formData += "<mch_id>" + mch_id + "</mch_id>" //商戶號  
    formData += "<nonce_str>" + nonce_str + "</nonce_str>" //隨機字符串，不長於32位。  
    formData += "<notify_url>" + notify_url + "</notify_url>"  
    formData += "<openid>" + openid + "</openid>"  
    formData += "<out_trade_no>" + bookingNo + "</out_trade_no>"  
    formData += "<spbill_create_ip>61.50.221.43</spbill_create_ip>"  
    formData += "<total_fee>" + total_fee + "</total_fee>"  
    formData += "<trade_type>JSAPI</trade_type>"  
    formData += "<sign>" + this.paysignjsapi(appid, attach, body, mch_id, nonce_str, notify_url, openid, bookingNo, '61.50.221.43', total_fee, 'JSAPI') + "</sign>"  
    formData += "</xml>"  
    var self = this
    request({  
      url: url,  
      method: 'POST',  
      body: formData  
    }, function(err, response, body) {  
      if (!err && response.statusCode == 200) {  
        var prepay_id = self.getXMLNodeValue('prepay_id', body.toString("utf-8")) 
        var tmp = prepay_id.split('[')  
        var tmp1 = tmp[2].split(']')  
        //簽名  
        var _paySignjs = self.paysignjs(appid, nonce_str, 'prepay_id=' + tmp1[0], 'MD5', timeStamp)  
        var args = {  
          appId: appid,  
          timeStamp: timeStamp,  
          nonceStr: nonce_str,  
          signType: "MD5",  
          package: tmp1[0],  
          paySign: _paySignjs  
        }
        deferred.resolve(args)  
      } else {  
        console.log(body)  
      } 
    })  
    return deferred.promise  
  }
}

以後咱們封裝下單接口：

unifiedorder: function (req, res) {
    var body = "測試支付"  
    var openid = "openid"
    var total_fee = 1
    var notify_url = "http://localhost/notify"
    var mch_id = config.shopId
    var attach = "測試"  
    wxpay.order(attach, body, mch_id, openid, total_fee, notify_url)
      .then(function(data){  
        console.log('data--->', data, 123123)
        res.json(data)
      })  
  },

而後咱們只須要在小程序裏面調用這個接口，就會獲取到全部的支付須要信息，再掉微信支付便可。

這裏說幾個小程序支付的坑：

1.統一下單接口是xml（這個不僅是小程序，公衆號也是），返回值也是xml格式須要本身獲取prepay_id,

2.簽名算法要帶上key，最後要轉換成大些

3.微信支付的sign算法也要帶上appid（這個不科學，深坑）

4.簽名算法必定不要用json拼接key

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