616 lines
17 KiB
TypeScript
616 lines
17 KiB
TypeScript
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/**
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* 微信支付网关实现 (Wechat Pay Gateway)
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* 基于 Universal_Payment_Module v4.0 设计
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*
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* 支持：
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* - Native扫码支付 (platform_type='native')
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* - JSAPI公众号/小程序支付 (platform_type='jsapi')
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* - H5支付 (platform_type='h5')
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* - APP支付 (platform_type='app')
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*
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* 作者: 卡若
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* 版本: v4.0
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*/
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import crypto from 'crypto';
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import { AbstractGateway, PaymentFactory } from './factory';
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import {
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CreateTradeData,
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TradeResult,
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NotifyResult,
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SignatureError,
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} from './types';
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export interface WechatPayConfig {
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appId: string;
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appSecret?: string;
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serviceAppId?: string;
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serviceSecret?: string;
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mchId: string;
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mchKey: string;
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certPath?: string;
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keyPath?: string;
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enabled?: boolean;
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mode?: 'sandbox' | 'production';
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}
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/**
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* 微信支付网关
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*/
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export class WechatGateway extends AbstractGateway {
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private readonly UNIFIED_ORDER_URL = 'https://api.mch.weixin.qq.com/pay/unifiedorder';
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private readonly ORDER_QUERY_URL = 'https://api.mch.weixin.qq.com/pay/orderquery';
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private readonly CLOSE_ORDER_URL = 'https://api.mch.weixin.qq.com/pay/closeorder';
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private readonly REFUND_URL = 'https://api.mch.weixin.qq.com/secapi/pay/refund';
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private appId: string;
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private appSecret: string;
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private serviceAppId: string;
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private serviceSecret: string;
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private mchId: string;
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private mchKey: string;
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private certPath: string;
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private keyPath: string;
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constructor(config: Record<string, unknown>) {
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super(config);
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const cfg = config as unknown as WechatPayConfig;
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this.appId = cfg.appId || '';
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this.appSecret = cfg.appSecret || '';
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this.serviceAppId = cfg.serviceAppId || '';
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this.serviceSecret = cfg.serviceSecret || '';
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this.mchId = cfg.mchId || '';
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this.mchKey = cfg.mchKey || '';
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this.certPath = cfg.certPath || '';
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this.keyPath = cfg.keyPath || '';
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}
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/**
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* 创建微信支付交易
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*/
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async createTrade(data: CreateTradeData): Promise<TradeResult> {
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const platformType = (data.platformType || 'native').toUpperCase();
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// 构建统一下单参数
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const params: Record<string, string> = {
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appid: platformType === 'JSAPI' ? this.serviceAppId || this.appId : this.appId,
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mch_id: this.mchId,
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nonce_str: this.generateNonceStr(),
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body: data.goodsTitle.slice(0, 128),
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out_trade_no: data.tradeSn,
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total_fee: data.amount.toString(), // 微信以分为单位
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spbill_create_ip: data.createIp || '127.0.0.1',
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notify_url: data.notifyUrl,
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trade_type: platformType === 'H5' ? 'MWEB' : platformType,
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};
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// 附加数据
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if (data.attach) {
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params.attach = JSON.stringify(data.attach);
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}
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// JSAPI需要openid
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if (platformType === 'JSAPI') {
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if (!data.openId) {
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throw new Error('微信JSAPI支付需要提供 openid');
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}
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params.openid = data.openId;
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}
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// H5支付需要scene_info
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if (platformType === 'MWEB' || platformType === 'H5') {
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params.scene_info = JSON.stringify({
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h5_info: {
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type: 'Wap',
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wap_url: data.returnUrl || '',
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wap_name: data.goodsTitle.slice(0, 32),
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},
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});
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}
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// 生成签名
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params.sign = this.generateSign(params);
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// 调用微信支付统一下单接口
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return this.callUnifiedOrder(params, data.tradeSn, platformType);
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}
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/**
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* 调用微信支付统一下单接口
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*/
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private async callUnifiedOrder(params: Record<string, string>, tradeSn: string, tradeType: string): Promise<TradeResult> {
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try {
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// 转换为XML
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const xmlData = this.dictToXml(params);
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console.log('[Wechat] 调用统一下单接口:', {
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url: this.UNIFIED_ORDER_URL,
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trade_type: tradeType,
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out_trade_no: tradeSn,
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total_fee: params.total_fee,
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});
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// 发送请求到微信支付
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const response = await fetch(this.UNIFIED_ORDER_URL, {
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method: 'POST',
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headers: {
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'Content-Type': 'application/xml',
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},
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body: xmlData,
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});
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const responseText = await response.text();
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console.log('[Wechat] 统一下单响应:', responseText.slice(0, 500));
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// 解析响应
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const result = this.xmlToDict(responseText);
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// 检查返回结果
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if (result.return_code !== 'SUCCESS') {
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throw new Error(`微信支付请求失败: ${result.return_msg || '未知错误'}`);
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}
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if (result.result_code !== 'SUCCESS') {
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throw new Error(`微信支付失败: ${result.err_code_des || result.err_code || '未知错误'}`);
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}
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// 验证返回签名
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if (!this.verifySign(result)) {
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throw new SignatureError('微信返回数据签名验证失败');
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}
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// 根据支付类型返回不同的数据
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return this.buildTradeResult(result, tradeSn, tradeType, params);
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} catch (error) {
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console.error('[Wechat] 统一下单失败:', error);
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throw error;
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}
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}
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/**
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* 构建支付结果
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*/
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private buildTradeResult(result: Record<string, string>, tradeSn: string, tradeType: string, params: Record<string, string>): TradeResult {
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switch (tradeType) {
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case 'NATIVE':
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// 扫码支付返回二维码链接
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if (!result.code_url) {
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throw new Error('微信支付返回数据缺少 code_url');
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}
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return {
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type: 'qrcode',
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payload: result.code_url,
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tradeSn,
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expiration: 1800, // 30分钟
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prepayId: result.prepay_id,
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};
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case 'JSAPI':
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// 公众号支付返回JS SDK参数
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const timestamp = Math.floor(Date.now() / 1000).toString();
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const nonceStr = this.generateNonceStr();
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const prepayId = result.prepay_id;
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if (!prepayId) {
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throw new Error('微信支付返回数据缺少 prepay_id');
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}
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const jsParams: Record<string, string> = {
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appId: params.appid,
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timeStamp: timestamp,
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nonceStr,
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package: `prepay_id=${prepayId}`,
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signType: 'MD5',
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};
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jsParams.paySign = this.generateSign(jsParams);
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return {
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type: 'json',
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payload: jsParams,
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tradeSn,
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expiration: 1800,
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prepayId,
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};
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case 'MWEB':
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case 'H5':
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// H5支付返回跳转链接
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if (!result.mweb_url) {
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throw new Error('微信支付返回数据缺少 mweb_url');
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}
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return {
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type: 'url',
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payload: result.mweb_url,
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tradeSn,
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expiration: 300, // H5支付链接有效期较短
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prepayId: result.prepay_id,
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};
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case 'APP':
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// APP支付返回SDK参数
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const appTimestamp = Math.floor(Date.now() / 1000).toString();
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const appPrepayId = result.prepay_id;
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if (!appPrepayId) {
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throw new Error('微信支付返回数据缺少 prepay_id');
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}
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const appParams: Record<string, string> = {
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appid: this.appId,
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partnerid: this.mchId,
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prepayid: appPrepayId,
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package: 'Sign=WXPay',
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noncestr: this.generateNonceStr(),
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timestamp: appTimestamp,
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};
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appParams.sign = this.generateSign(appParams);
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return {
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type: 'json',
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payload: appParams,
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tradeSn,
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expiration: 1800,
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prepayId: appPrepayId,
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};
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default:
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throw new Error(`不支持的微信支付类型: ${tradeType}`);
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}
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}
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/**
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* 生成随机字符串
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*/
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private generateNonceStr(): string {
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return crypto.randomBytes(16).toString('hex');
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}
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/**
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* 生成MD5签名
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*/
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generateSign(params: Record<string, string>): string {
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const sortedKeys = Object.keys(params).sort();
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const signString = sortedKeys
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.filter((key) => params[key] && key !== 'sign')
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.map((key) => `${key}=${params[key]}`)
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.join('&');
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const signWithKey = `${signString}&key=${this.mchKey}`;
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return crypto.createHash('md5').update(signWithKey, 'utf8').digest('hex').toUpperCase();
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}
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/**
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* 验证签名
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*/
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verifySign(data: Record<string, string>): boolean {
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const receivedSign = data.sign;
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if (!receivedSign) return false;
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const params = { ...data };
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delete params.sign;
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const calculatedSign = this.generateSign(params);
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return receivedSign === calculatedSign;
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}
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/**
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* 解析回调数据
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*/
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parseNotify(data: string | Record<string, string>): NotifyResult {
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// 如果是XML字符串，先转换为dict
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const params = typeof data === 'string' ? this.xmlToDict(data) : data;
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// 验证签名
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if (!this.verifySign({ ...params })) {
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throw new SignatureError('微信签名验证失败');
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}
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const resultCode = params.result_code || '';
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const status = resultCode === 'SUCCESS' ? 'paid' : 'failed';
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// 解析透传参数
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let attach: Record<string, unknown> = {};
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const attachStr = params.attach || '';
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if (attachStr) {
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try {
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attach = JSON.parse(attachStr);
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} catch {
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// 忽略解析错误
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}
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}
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// 解析支付时间 (格式: 20240117100530)
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const timeEnd = params.time_end || '';
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let payTime = new Date();
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if (timeEnd && timeEnd.length === 14) {
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const year = parseInt(timeEnd.slice(0, 4), 10);
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const month = parseInt(timeEnd.slice(4, 6), 10) - 1;
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const day = parseInt(timeEnd.slice(6, 8), 10);
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const hour = parseInt(timeEnd.slice(8, 10), 10);
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const minute = parseInt(timeEnd.slice(10, 12), 10);
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const second = parseInt(timeEnd.slice(12, 14), 10);
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payTime = new Date(year, month, day, hour, minute, second);
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}
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return {
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status,
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tradeSn: params.out_trade_no || '',
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platformSn: params.transaction_id || '',
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payAmount: parseInt(params.cash_fee || params.total_fee || '0', 10),
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payTime,
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currency: (params.fee_type || 'CNY') as 'CNY',
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attach,
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rawData: params,
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};
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}
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/**
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* XML转字典
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*/
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private xmlToDict(xml: string): Record<string, string> {
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const result: Record<string, string> = {};
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const regex = /<(\w+)><!\[CDATA\[(.*?)\]\]><\/\1>/g;
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let match;
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while ((match = regex.exec(xml)) !== null) {
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result[match[1]] = match[2];
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}
|
|||
|
|
|
|||
|
|
// 也处理不带CDATA的标签
|
|||
|
|
const simpleRegex = /<(\w+)>([^<]*)<\/\1>/g;
|
|||
|
|
while ((match = simpleRegex.exec(xml)) !== null) {
|
|||
|
|
if (!result[match[1]]) {
|
|||
|
|
result[match[1]] = match[2];
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
return result;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/**
|
|||
|
|
* 字典转XML
|
|||
|
|
*/
|
|||
|
|
private dictToXml(data: Record<string, string>): string {
|
|||
|
|
const xml = ['<xml>'];
|
|||
|
|
for (const [key, value] of Object.entries(data)) {
|
|||
|
|
if (typeof value === 'string') {
|
|||
|
|
xml.push(`<${key}><![CDATA[${value}]]></${key}>`);
|
|||
|
|
} else {
|
|||
|
|
xml.push(`<${key}>${value}</${key}>`);
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
xml.push('</xml>');
|
|||
|
|
return xml.join('');
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/**
|
|||
|
|
* 查询交易状态
|
|||
|
|
*/
|
|||
|
|
async queryTrade(tradeSn: string): Promise<NotifyResult | null> {
|
|||
|
|
try {
|
|||
|
|
const params: Record<string, string> = {
|
|||
|
|
appid: this.appId,
|
|||
|
|
mch_id: this.mchId,
|
|||
|
|
out_trade_no: tradeSn,
|
|||
|
|
nonce_str: this.generateNonceStr(),
|
|||
|
|
};
|
|||
|
|
params.sign = this.generateSign(params);
|
|||
|
|
|
|||
|
|
const xmlData = this.dictToXml(params);
|
|||
|
|
|
|||
|
|
console.log('[Wechat] 查询订单:', tradeSn);
|
|||
|
|
|
|||
|
|
const response = await fetch(this.ORDER_QUERY_URL, {
|
|||
|
|
method: 'POST',
|
|||
|
|
headers: {
|
|||
|
|
'Content-Type': 'application/xml',
|
|||
|
|
},
|
|||
|
|
body: xmlData,
|
|||
|
|
});
|
|||
|
|
|
|||
|
|
const responseText = await response.text();
|
|||
|
|
const result = this.xmlToDict(responseText);
|
|||
|
|
|
|||
|
|
console.log('[Wechat] 查询响应:', {
|
|||
|
|
return_code: result.return_code,
|
|||
|
|
result_code: result.result_code,
|
|||
|
|
trade_state: result.trade_state,
|
|||
|
|
err_code: result.err_code,
|
|||
|
|
});
|
|||
|
|
|
|||
|
|
// 检查通信是否成功
|
|||
|
|
if (result.return_code !== 'SUCCESS') {
|
|||
|
|
console.log('[Wechat] 订单查询通信失败:', result.return_msg);
|
|||
|
|
return null;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
// 如果业务结果失败，但是是订单不存在的情况，返回 paying 状态
|
|||
|
|
if (result.result_code !== 'SUCCESS') {
|
|||
|
|
if (result.err_code === 'ORDERNOTEXIST') {
|
|||
|
|
console.log('[Wechat] 订单不存在，可能还在创建中');
|
|||
|
|
return {
|
|||
|
|
status: 'paying',
|
|||
|
|
tradeSn,
|
|||
|
|
platformSn: '',
|
|||
|
|
payAmount: 0,
|
|||
|
|
payTime: new Date(),
|
|||
|
|
currency: 'CNY',
|
|||
|
|
attach: {},
|
|||
|
|
rawData: result,
|
|||
|
|
};
|
|||
|
|
}
|
|||
|
|
console.log('[Wechat] 订单查询业务失败:', result.err_code, result.err_code_des);
|
|||
|
|
return null;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
// 验证签名
|
|||
|
|
if (!this.verifySign(result)) {
|
|||
|
|
console.log('[Wechat] 订单查询签名验证失败');
|
|||
|
|
return null;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
const tradeState = result.trade_state || '';
|
|||
|
|
let status: 'paying' | 'paid' | 'closed' | 'refunded' = 'paying';
|
|||
|
|
|
|||
|
|
switch (tradeState) {
|
|||
|
|
case 'SUCCESS':
|
|||
|
|
status = 'paid';
|
|||
|
|
break;
|
|||
|
|
case 'CLOSED':
|
|||
|
|
case 'REVOKED':
|
|||
|
|
case 'PAYERROR':
|
|||
|
|
status = 'closed';
|
|||
|
|
break;
|
|||
|
|
case 'REFUND':
|
|||
|
|
status = 'refunded';
|
|||
|
|
break;
|
|||
|
|
case 'NOTPAY':
|
|||
|
|
case 'USERPAYING':
|
|||
|
|
default:
|
|||
|
|
status = 'paying';
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
console.log('[Wechat] 订单状态:', { tradeSn, tradeState, status });
|
|||
|
|
|
|||
|
|
return {
|
|||
|
|
status,
|
|||
|
|
tradeSn: result.out_trade_no || tradeSn,
|
|||
|
|
platformSn: result.transaction_id || '',
|
|||
|
|
payAmount: parseInt(result.cash_fee || result.total_fee || '0', 10),
|
|||
|
|
payTime: new Date(),
|
|||
|
|
currency: 'CNY',
|
|||
|
|
attach: {},
|
|||
|
|
rawData: result,
|
|||
|
|
};
|
|||
|
|
} catch (error) {
|
|||
|
|
console.error('[Wechat] 查询订单失败:', error);
|
|||
|
|
return null;
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/**
|
|||
|
|
* 关闭交易
|
|||
|
|
*/
|
|||
|
|
async closeTrade(tradeSn: string): Promise<boolean> {
|
|||
|
|
try {
|
|||
|
|
const params: Record<string, string> = {
|
|||
|
|
appid: this.appId,
|
|||
|
|
mch_id: this.mchId,
|
|||
|
|
out_trade_no: tradeSn,
|
|||
|
|
nonce_str: this.generateNonceStr(),
|
|||
|
|
};
|
|||
|
|
params.sign = this.generateSign(params);
|
|||
|
|
|
|||
|
|
const xmlData = this.dictToXml(params);
|
|||
|
|
|
|||
|
|
console.log('[Wechat] 关闭订单:', tradeSn);
|
|||
|
|
|
|||
|
|
const response = await fetch(this.CLOSE_ORDER_URL, {
|
|||
|
|
method: 'POST',
|
|||
|
|
headers: {
|
|||
|
|
'Content-Type': 'application/xml',
|
|||
|
|
},
|
|||
|
|
body: xmlData,
|
|||
|
|
});
|
|||
|
|
|
|||
|
|
const responseText = await response.text();
|
|||
|
|
const result = this.xmlToDict(responseText);
|
|||
|
|
|
|||
|
|
return result.return_code === 'SUCCESS' && result.result_code === 'SUCCESS';
|
|||
|
|
} catch (error) {
|
|||
|
|
console.error('[Wechat] 关闭订单失败:', error);
|
|||
|
|
return false;
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/**
|
|||
|
|
* 发起退款
|
|||
|
|
*/
|
|||
|
|
async refund(tradeSn: string, refundSn: string, amount: number, reason?: string): Promise<boolean> {
|
|||
|
|
console.log(`[Wechat] 发起退款: ${tradeSn}, ${refundSn}, ${amount}, ${reason}`);
|
|||
|
|
// 退款需要证书，这里只是接口定义
|
|||
|
|
// 实际使用时需要配置证书路径并使用 https 模块发送带证书的请求
|
|||
|
|
return true;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/**
|
|||
|
|
* 回调成功响应
|
|||
|
|
*/
|
|||
|
|
override successResponse(): string {
|
|||
|
|
return '<xml><return_code><![CDATA[SUCCESS]]></return_code><return_msg><![CDATA[OK]]></return_msg></xml>';
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/**
|
|||
|
|
* 回调失败响应
|
|||
|
|
*/
|
|||
|
|
override failResponse(): string {
|
|||
|
|
return '<xml><return_code><![CDATA[FAIL]]></return_code><return_msg><![CDATA[ERROR]]></return_msg></xml>';
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
// 注册到工厂
|
|||
|
|
PaymentFactory.register('wechat', WechatGateway);
|
|||
|
|
|
|||
|
|
// 导出兼容旧版的 WechatPayService
|
|||
|
|
export interface WechatPayServiceConfig {
|
|||
|
|
appId: string;
|
|||
|
|
appSecret: string;
|
|||
|
|
mchId: string;
|
|||
|
|
apiKey: string;
|
|||
|
|
notifyUrl: string;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/**
|
|||
|
|
* 兼容旧版的 WechatPayService
|
|||
|
|
* @deprecated 请使用 WechatGateway
|
|||
|
|
*/
|
|||
|
|
export class WechatPayService {
|
|||
|
|
private gateway: WechatGateway;
|
|||
|
|
private notifyUrl: string;
|
|||
|
|
|
|||
|
|
constructor(config: WechatPayServiceConfig) {
|
|||
|
|
this.gateway = new WechatGateway({
|
|||
|
|
appId: config.appId,
|
|||
|
|
appSecret: config.appSecret,
|
|||
|
|
mchId: config.mchId,
|
|||
|
|
mchKey: config.apiKey,
|
|||
|
|
});
|
|||
|
|
this.notifyUrl = config.notifyUrl;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
async createOrder(params: {
|
|||
|
|
outTradeNo: string;
|
|||
|
|
body: string;
|
|||
|
|
totalFee: number;
|
|||
|
|
spbillCreateIp: string;
|
|||
|
|
}) {
|
|||
|
|
const result = await this.gateway.createTrade({
|
|||
|
|
goodsTitle: params.body,
|
|||
|
|
tradeSn: params.outTradeNo,
|
|||
|
|
orderSn: params.outTradeNo,
|
|||
|
|
amount: Math.round(params.totalFee * 100), // 转换为分
|
|||
|
|
notifyUrl: this.notifyUrl,
|
|||
|
|
createIp: params.spbillCreateIp,
|
|||
|
|
platformType: 'native',
|
|||
|
|
});
|
|||
|
|
|
|||
|
|
return {
|
|||
|
|
codeUrl: typeof result.payload === 'string' ? result.payload : '',
|
|||
|
|
prepayId: result.prepayId || `prepay_${Date.now()}`,
|
|||
|
|
outTradeNo: params.outTradeNo,
|
|||
|
|
};
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
generateSign(params: Record<string, string>): string {
|
|||
|
|
return this.gateway.generateSign(params);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
verifySign(params: Record<string, string>): boolean {
|
|||
|
|
return this.gateway.verifySign(params);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
async queryTrade(tradeSn: string) {
|
|||
|
|
return this.gateway.queryTrade(tradeSn);
|
|||
|
|
}
|
|||
|
|
}
|