package com.dsh.activity.util.wx;
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import com.wechat.pay.contrib.apache.httpclient.WechatPayHttpClientBuilder;
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import com.wechat.pay.contrib.apache.httpclient.auth.AutoUpdateCertificatesVerifier;
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import com.wechat.pay.contrib.apache.httpclient.auth.PrivateKeySigner;
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import com.wechat.pay.contrib.apache.httpclient.auth.WechatPay2Credentials;
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import com.wechat.pay.contrib.apache.httpclient.auth.WechatPay2Validator;
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import com.wechat.pay.contrib.apache.httpclient.util.PemUtil;
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import lombok.SneakyThrows;
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import org.apache.http.impl.client.CloseableHttpClient;
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import javax.servlet.http.HttpServletRequest;
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import java.io.*;
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import java.nio.charset.StandardCharsets;
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import java.nio.file.Files;
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import java.nio.file.Paths;
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import java.security.*;
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import java.security.cert.Certificate;
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import java.security.cert.CertificateException;
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import java.security.cert.CertificateFactory;
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import java.security.cert.X509Certificate;
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import java.security.spec.InvalidKeySpecException;
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import java.security.spec.PKCS8EncodedKeySpec;
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import java.security.spec.X509EncodedKeySpec;
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import java.util.Base64;
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import java.util.HashMap;
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import java.util.Map;
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import java.util.concurrent.ConcurrentHashMap;
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import java.util.stream.Collectors;
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import java.util.stream.Stream;
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/**
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* 微信支付V3 API 签名验证工具类
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*/
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public class WXPaySignatureCertificateUtil {
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// 保存微信平台证书
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private static final ConcurrentHashMap<String, AutoUpdateCertificatesVerifier> verifierMap = new ConcurrentHashMap<>();
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// 缓存公钥，避免频繁IO操作
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private static PublicKey cachedPublicKey = null;
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// 缓存私钥，避免频繁IO操作
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private static PrivateKey cachedPrivateKey = null;
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/**
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* 获取HTTP客户端，用于微信支付API请求
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*/
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public static CloseableHttpClient getWechatPayClient() throws IOException {
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PrivateKey merchantPrivateKey = getPrivateKey();
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// 构建支付客户端
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return WechatPayHttpClientBuilder.create()
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.withMerchant(WxV3PayConfig.Mch_ID, WxV3PayConfig.mchSerialNo, merchantPrivateKey)
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.withValidator(new WechatPay2Validator(getVerifier()))
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.build();
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}
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/**
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* 获取自动更新的证书验证器
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*/
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public static AutoUpdateCertificatesVerifier getVerifier() {
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String mchSerialNo = WxV3PayConfig.mchSerialNo;
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AutoUpdateCertificatesVerifier verifier = verifierMap.get(mchSerialNo);
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if (verifier == null) {
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synchronized (WXPaySignatureCertificateUtil.class) {
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verifier = verifierMap.get(mchSerialNo);
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if (verifier == null) {
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try {
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PrivateKey privateKey = getPrivateKey();
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PrivateKeySigner signer = new PrivateKeySigner(mchSerialNo, privateKey);
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WechatPay2Credentials credentials = new WechatPay2Credentials(WxV3PayConfig.Mch_ID, signer);
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verifier = new AutoUpdateCertificatesVerifier(
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credentials, WxV3PayConfig.apiV3Key.getBytes(StandardCharsets.UTF_8));
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verifierMap.put(mchSerialNo, verifier);
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} catch (Exception e) {
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throw new RuntimeException("初始化证书验证器失败", e);
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}
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}
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}
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}
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return verifier;
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}
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/**
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* 使用商户私钥对数据进行签名
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*
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* @param message 待签名数据
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* @return Base64编码的签名结果
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*/
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public static String sign(String message) {
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try {
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PrivateKey privateKey = getPrivateKey();
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Signature signature = Signature.getInstance("SHA256withRSA");
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signature.initSign(privateKey);
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signature.update(message.getBytes(StandardCharsets.UTF_8));
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return Base64.getEncoder().encodeToString(signature.sign());
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} catch (Exception e) {
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throw new RuntimeException("签名失败", e);
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}
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}
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/**
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* 使用微信支付平台公钥验证签名
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*
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* @param message 原始消息
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* @param signature Base64编码的签名
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* @return 验证结果
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*/
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public static boolean verifySign(String message, String signature) {
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try {
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PublicKey publicKey = getWechatPublicKey();
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Signature sig = Signature.getInstance("SHA256withRSA");
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sig.initVerify(publicKey);
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sig.update(message.getBytes(StandardCharsets.UTF_8));
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return sig.verify(Base64.getDecoder().decode(signature));
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} catch (Exception e) {
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throw new RuntimeException("验签失败", e);
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}
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}
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/**
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* 验证微信支付通知消息的签名
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*
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* @param request HTTP请求
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* @param body 请求体内容
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* @return 验证结果
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*/
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public static boolean verifyNotify(HttpServletRequest request, String body) {
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try {
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// 获取必要的HTTP头信息
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String timestamp = request.getHeader("Wechatpay-Timestamp");
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String nonce = request.getHeader("Wechatpay-Nonce");
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String serialNo = request.getHeader("Wechatpay-Serial");
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String signature = request.getHeader("Wechatpay-Signature");
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// 拼接验签字符串
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String message = Stream.of(timestamp, nonce, body)
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.collect(Collectors.joining("\n", "", "\n"));
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// 使用自动更新的证书验证器进行验证
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return getVerifier().verify(serialNo, message.getBytes(StandardCharsets.UTF_8), signature);
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} catch (Exception e) {
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throw new RuntimeException("验证微信支付通知签名失败", e);
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}
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}
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/**
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* APP支付签名
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*/
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public static String appPaySign(String timestamp, String nonceStr, String prepayId) {
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String message = Stream.of(WxV3PayConfig.APP_ID, timestamp, nonceStr, prepayId)
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.collect(Collectors.joining("\n", "", "\n"));
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return sign(message);
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}
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/**
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* JSAPI支付签名
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*/
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public static String jsApiPaySign(String timestamp, String nonceStr, String prepayId) {
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String message = Stream.of(WxV3PayConfig.APP_ID, timestamp, nonceStr, "prepay_id="+prepayId)
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.collect(Collectors.joining("\n", "", "\n"));
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return sign(message);
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}
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/**
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* 构建App支付参数
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*/
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public static Map<String, String> buildAppPayParams(String prepayId) {
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try {
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String timestamp = String.valueOf(System.currentTimeMillis() / 1000);
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String nonceStr = generateNonceStr();
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String sign = appPaySign(timestamp, nonceStr, prepayId);
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Map<String, String> params = new HashMap<>();
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params.put("appid", WxV3PayConfig.APP_ID);
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params.put("partnerid", WxV3PayConfig.Mch_ID);
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params.put("prepayid", prepayId);
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params.put("package", "Sign=WXPay");
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params.put("noncestr", nonceStr);
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params.put("timestamp", timestamp);
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params.put("sign", sign);
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return params;
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} catch (Exception e) {
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throw new RuntimeException("构建App支付参数失败", e);
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}
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}
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/**
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* 构建JSAPI支付参数
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*/
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public static Map<String, String> buildJsApiPayParams(String prepayId) {
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try {
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String timestamp = String.valueOf(System.currentTimeMillis() / 1000);
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String nonceStr = generateNonceStr();
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String sign = jsApiPaySign(timestamp, nonceStr, prepayId);
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Map<String, String> params = new HashMap<>();
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params.put("appId", WxV3PayConfig.APP_ID);
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params.put("timeStamp", timestamp);
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params.put("nonceStr", nonceStr);
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params.put("package", "prepay_id=" + prepayId);
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params.put("signType", "RSA");
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params.put("paySign", sign);
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return params;
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} catch (Exception e) {
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throw new RuntimeException("构建JSAPI支付参数失败", e);
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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 static String generateNonceStr() {
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return java.util.UUID.randomUUID().toString().replaceAll("-", "").substring(0, 32);
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}
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/**
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* 获取商户私钥
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*/
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public static PrivateKey getPrivateKey() {
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if (cachedPrivateKey != null) {
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return cachedPrivateKey;
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}
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try {
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String filePath = "D:\\玩湃v3参数\\apiclient_key.pem";
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String content = new String(Files.readAllBytes(Paths.get(filePath)), StandardCharsets.UTF_8);
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String privateKey = content.replace("-----BEGIN PRIVATE KEY-----", "")
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.replace("-----END PRIVATE KEY-----", "")
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.replaceAll("\\s+", "");
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KeyFactory kf = KeyFactory.getInstance("RSA");
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cachedPrivateKey = kf.generatePrivate(
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new PKCS8EncodedKeySpec(Base64.getDecoder().decode(privateKey)));
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return cachedPrivateKey;
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} catch (IOException e) {
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throw new RuntimeException("读取私钥文件失败", e);
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} catch (NoSuchAlgorithmException e) {
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throw new RuntimeException("当前Java环境不支持RSA", e);
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} catch (InvalidKeySpecException e) {
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throw new RuntimeException("无效的密钥格式", e);
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}
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}
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/**
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* 获取微信支付平台公钥
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*/
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public static PublicKey getWechatPublicKey() {
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if (cachedPublicKey != null) {
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return cachedPublicKey;
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}
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try {
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// 使用验证器获取最新的证书
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X509Certificate certificate = getVerifier().getValidCertificate();
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cachedPublicKey = certificate.getPublicKey();
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return cachedPublicKey;
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} catch (Exception e) {
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throw new RuntimeException("获取微信平台公钥失败", e);
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}
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}
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/**
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* 从PEM格式文件加载公钥
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*/
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public static PublicKey loadPublicKeyFromFile(String filePath) {
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try {
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String content = new String(Files.readAllBytes(Paths.get(filePath)), StandardCharsets.UTF_8);
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String publicKeyPEM = content
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.replace("-----BEGIN PUBLIC KEY-----", "")
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.replace("-----END PUBLIC KEY-----", "")
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.replaceAll("\\s+", "");
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byte[] encoded = Base64.getDecoder().decode(publicKeyPEM);
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KeyFactory keyFactory = KeyFactory.getInstance("RSA");
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return keyFactory.generatePublic(new X509EncodedKeySpec(encoded));
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} catch (Exception e) {
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throw new RuntimeException("加载公钥文件失败", e);
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}
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}
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/**
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* 从证书文件加载公钥
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*/
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public static PublicKey loadPublicKeyFromCert(String filePath) {
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try (FileInputStream inputStream = new FileInputStream(filePath)) {
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CertificateFactory factory = CertificateFactory.getInstance("X.509");
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X509Certificate cert = (X509Certificate) factory.generateCertificate(inputStream);
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return cert.getPublicKey();
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} catch (Exception e) {
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throw new RuntimeException("加载证书文件失败", e);
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}
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}
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}
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