Paypal IPN请求处理与Spring控制器？

Question

我想扩展一个Spring应用程序的功能，包括一个HTTPendpoint，以接收贝宝即时支付通知。

Paypal在HTTP正文中发送这些内容，如下所示：

MC_Gross=19.95&protection_eligibility=合格&address_status=确认状态s&txn_type=express_checkout&item_name=&mc_currency=usd&item_number=&restence_country=us&test_ipn=1&handling_amount=0.00&transaction_subject=&payment_gross=19.95&shipping=0.00

https://developer.paypal.com/docs/classic/ipn/integration-guide/ipnintro/

我是否需要定义一个具体的类来定义请求体。

请求类

    public class PaypalIPNRequest {

    private static final long serialVersionUID = 1L;
    private String mc_gross;
    private String protection_eligibility;
    private String address_street;
    ...


    public PaypalIPNRequest() {
    }

    //getters setters
}

控制器

@Override
@Auditable
@RequestMapping(value = "/ipnRequest.do", method = RequestMethod.POST)
@ResponseStatus(value = HttpStatus.OK)
public void ipnRequest(@RequestBody final PaypalIPNRequest request) {
}

正如本文所述，SO答案:@RequestBody和@ResponseBody注释在Spring中

如果贝宝在未来改变他们的IPN请求会发生什么，这会打破吗？

是否有更好的方法在没有特定类的情况下传递请求体？

我可以使用HttpServletRequest吗？

Answer 1

我过去所做的是使用com.paypal.base.ipn.ipnmessage验证并从请求中检索（如您所建议的）对我来说重要的字段，而不是将整个请求体映射到具体的类，即：

private final static String PAYPAL_WEB_IPN_TXN_PARAM = "txn_id";
private final static String PAYPAL_WEB_IPN_AMOUNT_PARAM = "mc_gross";
private final static String PAYPAL_WEB_IPN_PAYMENT_STATUS_PARAM = "payment_status";
private final static String PAYPAL_WEB_IPN_PAYMENT_STATUS = "Completed";

@Resource(name = "payPalConfigurationMap")
private Map<String, String> configurationMap;

private OAuthTokenCredential oAuthTokenCredential;

@PostConstruct
public void init() {
    Properties properties = new Properties();
    properties.putAll(configurationMap);
    PayPalResource.initConfig(properties);

    oAuthTokenCredential = new OAuthTokenCredential(
            configurationMap.get(Constants.CLIENT_ID),
            configurationMap.get(Constants.CLIENT_SECRET),
            configurationMap
    );
}


public DonationDTO validateWebIPN(HttpServletRequest request) throws Exception {
    IPNMessage ipnlistener = new IPNMessage(request, configurationMap);
    boolean isIpnVerified = ipnlistener.validate();

    String paymentStatus = ipnlistener.getIpnValue(PAYPAL_WEB_IPN_PAYMENT_STATUS_PARAM);

    if (isIpnVerified && paymentStatus.equalsIgnoreCase(PAYPAL_WEB_IPN_PAYMENT_STATUS)) {
        String amount = ipnlistener.getIpnValue(PAYPAL_WEB_IPN_AMOUNT_PARAM);
        String tx = ipnlistener.getIpnValue(PAYPAL_WEB_IPN_TXN_PARAM);

        // irrelevant code

        return donationDTO;
    }else{
        String exceptionMessage = "Problem when requesting info from PayPal service";
        logger.error(exceptionMessage);
        throw new Exception(exceptionMessage);
    }
}

这样，除非Paypal更改了字段的名称（这不应该发生），否则您应该不会有任何问题。