APP微信支付统一下单签名

weixinpay.js

var crypto = require('crypto');
var moment = require('moment');
var xml2js = require('xml2js');

module.exports = {
	//生成随机字符串
	createNonceStr: function(){
		return Math.random().toString(36).substr(2, 15);
	},
	//生成时间戳
	createTimeStamp: function(){
		return parseInt(new Date().getTime() / 1000) + '';
	},
	//生成订单号
	createout_trade_no: function(){
		var date = moment().format('YYYY MM DD HH mm ss');
		var _date = date.split(' ').join('_');
		return _date + Math.random().toString().substr(2, 10);
	},
	//生成终端ip
	createspbill_create_ip: function(ip){
		return ip.split(':').slice(-1);
	},
	//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
	},
	//统一下单sign
	unifsign: function(appid, attach, body, mch_id, nonce_str, notify_url, openid, out_trade_no, spbill_create_ip, total_fee, trade_type, key){
		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 sign = crypto.createHash('md5').update(string, 'utf8').digest('hex')  
    	return sign.toUpperCase()  
	},
	//小程序调起支付sign
	paysign: function(appid, nonceStr, package, signType, timeStamp, key){
		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()
	},
	//获取prepay_id
  	getXMLNodeValue: function(node_name, xml) {
    	var tmp = xml.split("<" + node_name + ">")
    	var _tmp = tmp[1].split("</" + node_name + ">")
    	var _node = _tmp[0].split('[')  
        var node = _node[2].split(']')
    	return node[0]
  	},
  	//构建xml
  	buildXML: function(json){
  		var builder = new xml2js.Builder();
		return builder.buildObject(json);
  	},
  	//解析XML
  	parseXML: function(xml, fn){
  		var parser = new xml2js.Parser({ trim:true, explicitArray:false, explicitRoot:false });
		parser.parseString(xml, fn||function(err, result){});
  	},
  	//接收微信反馈信息流
  	recpipe: function(stream, fn){
		var buffers = [];
		stream.on('data', function (trunk) {
			buffers.push(trunk);
		});
		stream.on('end', function () {
			fn(null, Buffer.concat(buffers));
		});
		stream.once('error', fn);
	}
}