Apple Pay苹果支付IOS in-App Purchase内购项目服务端校验

　　苹果内购：只要你在苹果系统购买APP中虚拟物品（虚拟货币，VIP充值等），必须通过内购方式进行支付，苹果和商家进行三七开

　　验证模式有两种：

1、Validating Receipts With the App Store 通过访问苹果接口进行验证。

2、Validating Receipts Locally 本地代码解码进行验证

　　官方验证文档地址：https://developer.apple.com/library/archive/releasenotes/General/ValidateAppStoreReceipt/Chapters/ValidateRemotely.html#//apple_ref/doc/uid/TP40010573-CH104-SW1

　　官方文档说明：

　　我这里主要说一下服务端验证模式，大致流程为

1、app进行支付，然后收到苹果的收据（一串很长的BASE64编码的字符串）

2、app请求服务端，将收据给到服务端，服务端拿到收据请求苹果服务器验证收据是否为真

3、服务端验证收据真伪，验证当前支付的交易是否成功，成功则处理支付成功的业务逻辑

　　进行代码前，首先使用postman将收据发送给苹果服务器，熟悉一下返回的数据结构

　　重点说一下我的理解：

　　在官方文档和各个私人博客中都没有明确说明要验证的内容，百度一整天得到的验证逻辑为：苹果服务器只验证了收据的真伪，而收据包含多个交易的信息。

　　所以，我们验证当status字段为0(即收据为真)，且当前交易ID（app传递到后台）在收据交易列表中，即可认为交易支付成功；同时app传递当前支付产品的ID（我们内部的商品ID），处理该商品的订单。

　　注意：这个接口可以多次请求，所以应当将交易ID与订单进行绑定，防止一个交易生成多个订单

一、上验证代码，首先来一个百度的工具类，功能为组装请求数据，发送http请求

import javax.net.ssl.*;
import java.io.BufferedOutputStream;
import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.URL;
import java.security.cert.CertificateException;
import java.security.cert.X509Certificate;
import java.util.Locale;

/**
 * 苹果IAP内购验证工具类
 * Created by wangqichang on 2019/2/26.
 */
public class IosVerifyUtil {
    private static class TrustAnyTrustManager implements X509TrustManager {

        public void checkClientTrusted(X509Certificate[] chain, String authType) throws CertificateException {
        }

        public void checkServerTrusted(X509Certificate[] chain, String authType) throws CertificateException {
        }

        public X509Certificate[] getAcceptedIssuers() {
            return new X509Certificate[] {};
        }
    }

    private static class TrustAnyHostnameVerifier implements HostnameVerifier {
        public boolean verify(String hostname, SSLSession session) {
            return true;
        }
    }

    private static final String url_sandbox = "https://sandbox.itunes.apple.com/verifyReceipt";
    private static final String url_verify = "https://buy.itunes.apple.com/verifyReceipt";

    /**
     * 苹果服务器验证
     *
     * @param receipt
     *            账单
     * @url 要验证的地址
     * @return null 或返回结果 沙盒 https://sandbox.itunes.apple.com/verifyReceipt
     *
     */
    public static String buyAppVerify(String receipt,int type) {
        //环境判断 线上/开发环境用不同的请求链接
        String url = "";
        if(type==0){
            url = url_sandbox; //沙盒测试
        }else{
            url = url_verify; //线上测试
        }
        //String url = EnvUtils.isOnline() ?url_verify : url_sandbox;

        try {
            SSLContext sc = SSLContext.getInstance("SSL");
            sc.init(null, new TrustManager[] { new TrustAnyTrustManager() }, new java.security.SecureRandom());
            URL console = new URL(url);
            HttpsURLConnection conn = (HttpsURLConnection) console.openConnection();
            conn.setSSLSocketFactory(sc.getSocketFactory());
            conn.setHostnameVerifier(new TrustAnyHostnameVerifier());
            conn.setRequestMethod("POST");
            conn.setRequestProperty("content-type", "text/json");
            conn.setRequestProperty("Proxy-Connection", "Keep-Alive");
            conn.setDoInput(true);
            conn.setDoOutput(true);
            BufferedOutputStream hurlBufOus = new BufferedOutputStream(conn.getOutputStream());

            String str = String.format(Locale.CHINA, "{"receipt-data":"" + receipt + ""}");//拼成固定的格式传给平台
            hurlBufOus.write(str.getBytes());
            hurlBufOus.flush();

            InputStream is = conn.getInputStream();
            BufferedReader reader = new BufferedReader(new InputStreamReader(is));
            String line = null;
            StringBuffer sb = new StringBuffer();
            while ((line = reader.readLine()) != null) {
                sb.append(line);
            }

            return sb.toString();
        } catch (Exception ex) {
            System.out.println("苹果服务器异常");
            ex.printStackTrace();
        }
        return null;
    }

    /**
     * 用BASE64加密
     *
     * @param str
     * @return
     */
    public static String getBASE64(String str) {
        byte[] b = str.getBytes();
        String s = null;
        if (b != null) {
            s = new sun.misc.BASE64Encoder().encode(b);
        }
        return s;
    }

}

二、验证逻辑代码

/**
     * 苹果内购校验
     * @param priceId 会员价格ID
     * @param transactionId 苹果内购交易ID
     * @param payload 校验体（base64字符串）
     * @return
     */
    @PostMapping("/iospay")
    public Map<String, Object> iosPay(Long priceId,String transactionId, String payload) {
        log.info("苹果内购校验开始，交易ID：" + transactionId + " base64校验体：" + payload);
        Shipper shipper = getLoginShipper();
        if (shipper == null) {
            return failure("未登录");
        }

        //线上环境验证
        String verifyResult = IosVerifyUtil.buyAppVerify(payload, 1);
        if (verifyResult == null) {
            return failure("苹果验证失败，返回数据为空");
        } else {
            log.info("线上，苹果平台返回JSON:" + verifyResult);
            JSONObject appleReturn = JSONObject.parseObject(verifyResult);
            String states = appleReturn.getString("status");
            //无数据则沙箱环境验证
            if ("21007".equals(states)) {
                verifyResult = IosVerifyUtil.buyAppVerify(payload, 0);
                log.info("沙盒环境，苹果平台返回JSON:" + verifyResult);
                appleReturn = JSONObject.parseObject(verifyResult);
                states = appleReturn.getString("status");
            }
            log.info("苹果平台返回值：appleReturn" + appleReturn);
            // 前端所提供的收据是有效的    验证成功
            if (states.equals("0")) {
                String receipt = appleReturn.getString("receipt");
                JSONObject returnJson = JSONObject.parseObject(receipt);
                String inApp = returnJson.getString("in_app");
                List<HashMap> inApps = JSONObject.parseArray(inApp, HashMap.class);
                if (!CollectionUtils.isEmpty(inApps)) {
                    ArrayList<String> transactionIds = new ArrayList<String>();
                    for (HashMap app : inApps) {
                        transactionIds.add((String) app.get("transaction_id"));
                    }
                    //交易列表包含当前交易，则认为交易成功
                    if (transactionIds.contains(transactionId)) {
                        //处理业务逻辑
                        VipOrder vipOrder = vipOrderService.saveVipOrder(shipper, priceId, EnumPayType.APPLE_IN_APP_PURCHASES.getValue(),transactionId);
                        vipOrderService.paySuccess(vipOrder.getOrderCode(),null);
                        log.info("交易成功，新增并处理订单：{}",vipOrder.getOrderCode());
                        return success("充值成功");
                    }
                    return failure("当前交易不在交易列表中");
                }
                return failure("未能获取获取到交易列表");
            } else {
                return failure("支付失败，错误码：" + states);
            }
        }
    }

以上转载于作者：老王——KICHUN

链接：https://www.jianshu.com/p/976fc6090cfa

三、验证攻击处理

　　当然还需要注意一下攻击，毕竟是涉及到钱的问题

1、返回字段名

2、常见攻击

3、业务代码如下：

@Slf4j
@Service
public class ApplePayService {
    @Autowired
    private CurrencyService currencyService;
    @Autowired
    private EnvService envService;
    @Autowired
    private CurrencyHistoryDAO currencyHistoryDAO;

    private static class TrustAnyTrustManager implements X509TrustManager {

        public void checkClientTrusted(X509Certificate[] chain, String authType) throws CertificateException {
        }

        public void checkServerTrusted(X509Certificate[] chain, String authType) throws CertificateException {
        }

        public X509Certificate[] getAcceptedIssuers() {
            return new X509Certificate[] {};
        }
    }

    private static class TrustAnyHostnameVerifier implements HostnameVerifier {
        public boolean verify(String hostname, SSLSession session) {
            return true;
        }
    }

    // 发送请求验证订单真伪
    public String applePayVerify(String receiptData, Boolean isAgain){
        String verifyUrl = envService.isProd() ? "https://buy.itunes.apple.com/verifyReceipt" : "https://sandbox.itunes.apple.com/verifyReceipt";
        if (isAgain){
            verifyUrl = "https://sandbox.itunes.apple.com/verifyReceipt";
        }
        try{
            SSLContext sc = SSLContext.getInstance("SSL");
            sc.init(null, new TrustManager[] { new ApplePayService.TrustAnyTrustManager() }, new java.security.SecureRandom());
            URL console = new URL(verifyUrl);
            HttpsURLConnection conn = (HttpsURLConnection) console.openConnection();
            conn.setSSLSocketFactory(sc.getSocketFactory());
            conn.setHostnameVerifier(new ApplePayService.TrustAnyHostnameVerifier());
            conn.setRequestMethod("POST");
            conn.setRequestProperty("content-type", "text/json");
            conn.setRequestProperty("Proxy-Connection", "Keep-Alive");
            conn.setDoInput(true);
            conn.setDoOutput(true);
            BufferedOutputStream hurlBufOus = new BufferedOutputStream(conn.getOutputStream());

            String str = String.format(Locale.CHINA, "{"receipt-data":"" + receiptData + ""}");//拼成固定的格式传给平台
            hurlBufOus.write(str.getBytes());
            hurlBufOus.flush();

            InputStream is = conn.getInputStream();
            BufferedReader reader = new BufferedReader(new InputStreamReader(is));
            String line = null;
            StringBuffer sb = new StringBuffer();
            while ((line = reader.readLine()) != null) {
                sb.append(line);
            }
            return sb.toString();

        } catch (Exception e) {
            log.error("苹果服务器异常:" + LogUtil.getStack(e));
        }
        return null;
    }

    /**
     * 苹果内购校验
     * @param transactionId 苹果内购交易ID
     * @param receiptData 校验体（base64字符串）
     * @return
     */
    public OperationInfo applePay(String transactionId, String receiptData){
        // 验证真伪
        String verifyResult = applePayVerify(receiptData, false);
        if (verifyResult == null) {
            return OperationInfo.failure("苹果验证失败，返回数据为空");
        } else {
            JSONObject appleReturn = JSONObject.parseObject(verifyResult);
            String status = appleReturn.getString("status");
            // 如果生产环境也是沙箱，则使用沙箱url请求
            if (status.equals("21007")){
                verifyResult = applePayVerify(receiptData, true);
                if (verifyResult == null) {
                    return OperationInfo.failure("苹果验证失败，返回数据为空");
                } else {
                    appleReturn = JSONObject.parseObject(verifyResult);
                    status = appleReturn.getString("status");
                }
            }
            if (status.equals("0")) {
                String receipt = appleReturn.getString("receipt");
                // 防止重复验证攻击
                String md5Receipt = DigestUtils.md5DigestAsHex(receipt.getBytes());
                List<Integer> historyList = currencyHistoryDAO.findByMd5Receipt(md5Receipt);
                if (historyList != null && !historyList.isEmpty()){
                    return OperationInfo.failure("支付失败，重复验证");
                }

                JSONObject returnJson = JSONObject.parseObject(receipt);
                // 防止跨app攻击
                if (!StringUtils.equals("com.modbapp", returnJson.getString("bid"))){
                    return OperationInfo.failure("支付失败，非本app订单");
                }

                // 防止换价格攻击
                if (!StringUtils.equals(transactionId, returnJson.getString("product_id"))){
                    return OperationInfo.failure("支付失败，支付金额有误");
                }
                BigDecimal price;
                switch (transactionId){
                    case "**6": price = new BigDecimal(6); break;
                    case "**18": price = new BigDecimal(18); break;
                    case "**68": price = new BigDecimal(68); break;
                    case "**108": price = new BigDecimal(108); break;
                    case "**218": price = new BigDecimal(218); break;
                    case "**318": price = new BigDecimal(318); break;
                    case "**418": price = new BigDecimal(418); break;
                    case "**648": price = new BigDecimal(648); break;
                    case "**998": price = new BigDecimal(998); break;
                    default: return OperationInfo.failure("当前交易不在交易列表中");
                }
                // 更改墨币
                currencyService.rechargeCurrency(CurrencyEnum.PURCHASE_CURRENCY, price, UserUtils.getCurrentUserId(), "购买墨币", md5Receipt);
                return OperationInfo.success("充值成功");
            }
            return OperationInfo.failure("支付失败，错误码：" + status);
        }
    }
}