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package com.sky.utils;
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import com.alibaba.fastjson.JSON;
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import com.alibaba.fastjson.JSONObject;
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import com.sky.properties.WeChatProperties;
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import com.wechat.pay.contrib.apache.httpclient.WechatPayHttpClientBuilder;
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import com.wechat.pay.contrib.apache.httpclient.util.PemUtil;
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import org.apache.commons.lang.RandomStringUtils;
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import org.apache.http.HttpHeaders;
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import org.apache.http.client.methods.CloseableHttpResponse;
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import org.apache.http.client.methods.HttpGet;
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import org.apache.http.client.methods.HttpPost;
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import org.apache.http.entity.ContentType;
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import org.apache.http.entity.StringEntity;
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import org.apache.http.impl.client.CloseableHttpClient;
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import org.apache.http.util.EntityUtils;
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import org.springframework.beans.factory.annotation.Autowired;
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import org.springframework.stereotype.Component;
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import java.io.File;
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import java.io.FileInputStream;
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import java.io.FileNotFoundException;
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import java.math.BigDecimal;
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import java.security.PrivateKey;
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import java.security.Signature;
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import java.security.cert.X509Certificate;
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import java.util.ArrayList;
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import java.util.Arrays;
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import java.util.Base64;
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import java.util.List;
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/**
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* 微信支付工具类，提供微信支付相关的操作，如下单、退款等。
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*/
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@Component
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public class WeChatPayUtil {
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/**
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* 微信支付下单接口地址。
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*/
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public static final String JSAPI = "https://api.mch.weixin.qq.com/v3/pay/transactions/jsapi";
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/**
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* 申请退款接口地址。
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*/
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public static final String REFUNDS = "https://api.mch.weixin.qq.com/v3/refund/domestic/refunds";
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@Autowired
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private WeChatProperties weChatProperties;
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/**
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* 获取调用微信接口的客户端工具对象。
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* 使用商户API私钥和微信支付平台证书进行签名和验签。
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*
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* @return CloseableHttpClient 客户端工具对象。
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*/
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private CloseableHttpClient getClient() {
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PrivateKey merchantPrivateKey = null;
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try {
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// 加载商户API私钥
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merchantPrivateKey = PemUtil.loadPrivateKey(new FileInputStream(new File(weChatProperties.getPrivateKeyFilePath())));
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// 加载微信支付平台证书
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X509Certificate x509Certificate = PemUtil.loadCertificate(new FileInputStream(new File(weChatProperties.getWeChatPayCertFilePath())));
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List<X509Certificate> wechatPayCertificates = Arrays.asList(x509Certificate);
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// 构建HttpClient，自动处理签名和验签
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WechatPayHttpClientBuilder builder = WechatPayHttpClientBuilder.create()
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.withMerchant(weChatProperties.getMchid(), weChatProperties.getMchSerialNo(), merchantPrivateKey)
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.withWechatPay(wechatPayCertificates);
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CloseableHttpClient httpClient = builder.build();
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return httpClient;
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} catch (FileNotFoundException e) {
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e.printStackTrace();
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return null;
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}
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}
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/**
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* 发送POST请求到指定URL。
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*
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* @param url 请求的URL地址
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* @param body 请求的JSON体
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* @return 响应结果字符串
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* @throws Exception 可能抛出的异常
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*/
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private String post(String url, String body) throws Exception {
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CloseableHttpClient httpClient = getClient();
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HttpPost httpPost = new HttpPost(url);
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httpPost.addHeader(HttpHeaders.ACCEPT, ContentType.APPLICATION_JSON.toString());
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httpPost.addHeader(HttpHeaders.CONTENT_TYPE, ContentType.APPLICATION_JSON.toString());
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httpPost.addHeader("Wechatpay-Serial", weChatProperties.getMchSerialNo());
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httpPost.setEntity(new StringEntity(body, "UTF-8"));
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CloseableHttpResponse response = httpClient.execute(httpPost);
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try {
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String bodyAsString = EntityUtils.toString(response.getEntity());
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return bodyAsString;
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} finally {
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httpClient.close();
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response.close();
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}
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}
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/**
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* 发送GET请求到指定URL。
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*
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* @param url 请求的URL地址
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* @return 响应结果字符串
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* @throws Exception 可能抛出的异常
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*/
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private String get(String url) throws Exception {
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CloseableHttpClient httpClient = getClient();
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HttpGet httpGet = new HttpGet(url);
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httpGet.addHeader(HttpHeaders.ACCEPT, ContentType.APPLICATION_JSON.toString());
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httpGet.addHeader(HttpHeaders.CONTENT_TYPE, ContentType.APPLICATION_JSON.toString());
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httpGet.addHeader("Wechatpay-Serial", weChatProperties.getMchSerialNo());
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CloseableHttpResponse response = httpClient.execute(httpGet);
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try {
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String bodyAsString = EntityUtils.toString(response.getEntity());
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return bodyAsString;
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} finally {
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httpClient.close();
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response.close();
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}
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}
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/**
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* 使用JSAPI进行微信支付下单。
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*
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* @param orderNum 商户订单号
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* @param total 总金额（元）
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* @param description 商品描述
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* @param openid 微信用户的openid
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* @return 响应结果字符串
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* @throws Exception 可能抛出的异常
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*/
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private String jsapi(String orderNum, BigDecimal total, String description, String openid) throws Exception {
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JSONObject jsonObject = new JSONObject();
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jsonObject.put("appid", weChatProperties.getAppid());
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jsonObject.put("mchid", weChatProperties.getMchid());
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jsonObject.put("description", description);
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jsonObject.put("out_trade_no", orderNum);
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jsonObject.put("notify_url", weChatProperties.getNotifyUrl());
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JSONObject amount = new JSONObject();
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amount.put("total", total.multiply(new BigDecimal(100)).setScale(2, BigDecimal.ROUND_HALF_UP).intValue());
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amount.put("currency", "CNY");
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jsonObject.put("amount", amount);
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JSONObject payer = new JSONObject();
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payer.put("openid", openid);
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jsonObject.put("payer", payer);
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String body = jsonObject.toJSONString();
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return post(JSAPI, body);
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}
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/**
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* 小程序支付接口。
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*
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* @param orderNum 商户订单号
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* @param total 金额，单位元
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* @param description 商品描述
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* @param openid 微信用户的openid
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* @return 包含支付参数的JSONObject
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* @throws Exception 可能抛出的异常
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*/
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public JSONObject pay(String orderNum, BigDecimal total, String description, String openid) throws Exception {
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String bodyAsString = jsapi(orderNum, total, description, openid);
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JSONObject jsonObject = JSON.parseObject(bodyAsString);
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String prepayId = jsonObject.getString("prepay_id");
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if (prepayId != null) {
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String timeStamp = String.valueOf(System.currentTimeMillis() / 1000);
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String nonceStr = RandomStringUtils.randomNumeric(32);
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ArrayList<Object> list = new ArrayList<>();
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list.add(weChatProperties.getAppid());
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list.add(timeStamp);
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list.add(nonceStr);
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list.add("prepay_id=" + prepayId);
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StringBuilder stringBuilder = new StringBuilder();
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for (Object o : list) {
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stringBuilder.append(o).append("\n");
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}
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String signMessage = stringBuilder.toString();
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byte[] message = signMessage.getBytes();
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Signature signature = Signature.getInstance("SHA256withRSA");
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signature.initSign(PemUtil.loadPrivateKey(new FileInputStream(new File(weChatProperties.getPrivateKeyFilePath()))));
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signature.update(message);
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String packageSign = Base64.getEncoder().encodeToString(signature.sign());
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JSONObject jo = new JSONObject();
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jo.put("timeStamp", timeStamp);
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jo.put("nonceStr", nonceStr);
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jo.put("package", "prepay_id=" + prepayId);
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jo.put("signType", "RSA");
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jo.put("paySign", packageSign);
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return jo;
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}
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return jsonObject;
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}
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/**
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* 申请退款接口。
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*
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* @param outTradeNo 商户订单号
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* @param outRefundNo 商户退款单号
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* @param refund 退款金额
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* @param total 原订单金额
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* @return 响应结果字符串
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* @throws Exception 可能抛出的异常
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*/
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public String refund(String outTradeNo, String outRefundNo, BigDecimal refund, BigDecimal total) throws Exception {
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JSONObject jsonObject = new JSONObject();
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jsonObject.put("out_trade_no", outTradeNo);
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jsonObject.put("out_refund_no", outRefundNo);
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JSONObject amount = new JSONObject();
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amount.put("refund", refund.multiply(new BigDecimal(100)).setScale(2, BigDecimal.ROUND_HALF_UP).intValue());
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amount.put("total", total.multiply(new BigDecimal(100)).setScale(2, BigDecimal.ROUND_HALF_UP).intValue());
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amount.put("currency", "CNY");
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jsonObject.put("amount", amount);
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jsonObject.put("notify_url", weChatProperties.getRefundNotifyUrl());
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String body = jsonObject.toJSONString();
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return post(REFUNDS, body);
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}
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}
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