rapid-swiftpass/app/weixin.js

SwiftPass module

/**
 * Copyright (c) 2017 Lucky Byte, Inc.
 */
const debug = require('debug')('swiftpass');
const crypto = require('crypto');
const moment = require('moment');
const winston = require('winston');
const utils = require('../lib/utils');
const post = require('../lib/post');

/**
 * 微信 APP 支付下单
 *
 * 参数:
 *      dest_url: 威富通服务地址
 *      params:   JSON，包含下列的 keys:
 *          appid:      商户APP对应的微信开发平台移动应用 appid
 *          merno:      威富通平台内商户编号
 *          sign_key:   威富通商户签名密钥
 *          order_id:   平台内订单号，32 字符内，唯一
 *          amount:     交易金额，单位为分
 *          notify_url: 接收平台通知的 URL
 *
 * 返回:
 *      成功返回: {
 *          reqt:       请求报文
 *          resp:       响应报文
 *          succ:       true
 *          token:      支付授权码
 *      }
 */
const exchange = async (dest_url, params) => {
    if (!dest_url || !params) {
        throw new Error('微信APP支付请求参数无效');
    }
    const required = [
        'appid', 'merno', 'order_id', 'amount', 'notify_url', 'sign_key'
    ]
    for (let i = 0; i < required.length; i++) {
        if (!params[required[i]]) {
            throw new Error(`微信APP支付请求缺少字段[${required[i]}]`);
        }
    }
    let reqt_json = {
        service: 'pay.weixin.raw.app',
        version: '2.0',
        charset: 'UTF-8',
        sign_type: 'MD5',
        nonce_str: crypto.randomBytes(16).toString('hex'),
        time_start: moment().format('YYYYMMDDHHmmss'),
        time_expire: moment().add(60, 'minutes').format('YYYYMMDDHHmmss'),
        appid: params.appid,
        mch_id: params.merno,
        out_trade_no: params.order_id,
        body: `订单${params.order_id}`,
        total_fee: parseInt(params.amount),
        mch_create_ip: '127.0.0.1',
        notify_url: params.notify_url,
    }
    reqt_json.sign = utils.gen_sign(reqt_json, params.sign_key);

    winston.info('威富通微信APP支付请求报文:', JSON.stringify(reqt_json, null, 2));

    const resp_data = await post(dest_url, reqt_json);
    const resp_json = await utils.parse_resp_xml(resp_data);

    winston.info('威富通微信APP支付响应报文:', JSON.stringify(resp_json, null, 2));

    if (!utils.verify_sign(resp_json, params.sign_key)) {
        throw new Error('验证威富通微信APP支付响应报文签名失败');
    }
    winston.info('验证威富通微信APP支付响应报文签名通过');

    if (parseInt(resp_json.result_code) != 0) {
        return {
            reqt: reqt_json,
            resp: resp_json,
            succ: false,
            errmsg: resp_json.err_msg || '交易失败'
        }
    }
    return {
        reqt: reqt_json,
        resp: resp_json,
        succ: true,
        pay_info: resp_json.pay_info,
    };
}

module.exports = {
    exchange: exchange,
}