rapid-swiftpass/refund/index.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');

/**
 * 将上游返回的交易类型转换为平台统一格式
 */
const trade_type_to_pay_type = (trade_type) => {
    switch(trade_type) {
    case 'pay.alipay.micropay':
        return 'alipay';
    case 'pay.weixin.micropay':
        return 'weixin';
    case 'pay.jdpay.micropay':
        return 'jdpay';
    case 'pay.qq.micropay':
        return 'tenpay';
    case 'pay.shiming.micropay':
        return 'shiming';
    case 'pay.unionpay.proxy.micropay':
        return 'unionpay';
    case 'pay.bestpay.micropay':
        return 'bestpay';
    default:
        return 'unknown';
    }
}

/**
 * 退款，实时返回交易结果
 *
 * 参数:
 *      dest_url: 威富通服务地址
 *      params:   JSON，包含下列的 keys:
 *          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
 *          refund_no:  退款单号
 *          amount:     交易金额
 *          refund_amt: 退款金额
 *
 * 返回:
 *      成功返回: {
 *          reqt:       请求报文
 *          resp:       响应报文
 *          succ:       true
 *          pay_type:   支付方式
 *      }
 *      失败返回: {
 *          reqt:       请求报文
 *          resp:       响应报文
 *          succ:       false
 *          errmsg:     错误信息
 *      }
 */
const exchange = async (dest_url, params) => {
    if (!dest_url || !params) {
        throw new Error('退款请求参数无效');
    }
    const required = [
        'merno', 'sign_key', 'order_id', 'amount',
        'refund_no', 'refund_amt'
    ]
    for (let i = 0; i < required.length; i++) {
        if (!params[required[i]]) {
            throw new Error(`退款请求缺少字段[${required[i]}]`);
        }
    }
    let reqt_json = {
        service: 'unified.trade.refund',
        version: '2.0',
        charset: 'UTF-8',
        sign_type: 'MD5',
        nonce_str: crypto.randomBytes(16).toString('hex'),
        mch_id: params.merno,
        out_trade_no: params.order_id,
        out_refund_no: params.refund_no,
        total_fee: parseInt(params.amount),
        refund_fee: parseInt(params.refund_amt),
        op_user_id: params.merno,
    }
    reqt_json.sign = utils.gen_sign(reqt_json, params.sign_key);

    winston.info('威富通退款请求报文:', 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('威富通退款响应报文:', JSON.stringify(resp_json, null, 2));

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

    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,
        order_id: resp_json.out_trade_no,
        refund_no: resp_json.refund_no,
        refund_id: resp_json.refund_id,
        channel: resp_json.refund_channel,
        refund_amt: resp_json.refund_fee,
    };
}


module.exports = {
    exchange: exchange,
}