Springboot拦截器实现IP黑名单

Posted 2020-12-10 烟雨先生

Springboot拦截器实现IP黑名单

一·业务场景和需要实现的功能

以redis作为IP存储地址实现。

业务场景：针对秒杀活动或者常规电商业务场景等，防止恶意脚本不停的刷接口。

实现功能：写一个拦截器拦截掉黑名单IP,额外增加一个接口，将ip地址添加到redis中，并且返回redis中当前全部ip

二·Springboot中定义一个拦截器

@Order(0)
@Aspect
@Component
public class AopInterceptor {


    /**
     * 定义拦截器规则
     */
    @Pointcut("execution(* com.test.test.api.controller.test.test.*(..))")
    public void pointCut() {
    }

      /**
     * 拦截器具体实现
     *
     * @throws Throwable
     */
    @Around(value = "pointCut()")
    public Object around(ProceedingJoinPoint point) throws Throwable {
        try {

            HttpServletRequest request = ((ServletRequestAttributes) RequestContextHolder.getRequestAttributes()).getRequest();
            //判断是否为黑名单用户
            String ip = getIpAddress(request);
            if (checkIpBlack(ip)) {
                //ip在黑名单中返回false
                //return false;
                DefaultResponse defaultResponse = new DefaultResponse();
                defaultResponse.setCode(-1);
                defaultResponse.setMessage("ip在黑名单中，拒绝访问.");
                SysLogHelper.log("IpBlackAopInterceptor", "当前请求ip" + ip, "ip在黑名单中，拒绝访问");
                return defaultResponse;
            } else {
                //ip不在黑名单中返回true
                SysLogHelper.log("IpBlackAopInterceptor", "当前请求ip" + ip, "ip正常，允许访问");
                return point.proceed();
            }


        } catch (Exception e) {
            e.printStackTrace();
            SysLogHelper.error("IpBlackAopInterceptor黑名单拦截异常：", ExceptionUtils.getMessage(e) + "详细" + ExceptionUtils.getStackTrace(e), null);
        }
        return point.getArgs();
    }

    //对比当前请求IP是否在黑名单中，注意（对比黑名单ip存放在redis中）
    public boolean checkIpBlack(String ip) throws Exception {
        IpBlackBody body = new IpBlackBody();
        body = cacheHelper.get("IpBlack:ips", IpBlackBody.class);
        if (body != null) {
            for (int i = 0; i < body.getIp().length; i++) {
                if (body.getIp()[i].equals(ip))
                    return true;
            }
        }
        return false;
    }

}

三·获取请求主机IP地址

 public final static String getIpAddress(HttpServletRequest request)
            throws IOException {
        // 获取请求主机IP地址,如果通过代理进来，则透过防火墙获取真实IP地址

        String ip = request.getHeader("x-forwarded-for");

        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            if (ip == null || ip.length() == 0
                    || "unknown".equalsIgnoreCase(ip)) {
                ip = request.getHeader("Proxy-Client-IP");
            }
            if (ip == null || ip.length() == 0
                    || "unknown".equalsIgnoreCase(ip)) {
                ip = request.getHeader("WL-Proxy-Client-IP");
            }
            if (ip == null || ip.length() == 0
                    || "unknown".equalsIgnoreCase(ip)) {
                ip = request.getHeader("HTTP_CLIENT_IP");
            }
            if (ip == null || ip.length() == 0
                    || "unknown".equalsIgnoreCase(ip)) {
                ip = request.getHeader("HTTP_X_FORWARDED_FOR");
            }
            if (ip == null || ip.length() == 0
                    || "unknown".equalsIgnoreCase(ip)) {
                ip = request.getRemoteAddr();
            }
        } else if (ip.length() > 15) {
            String[] ips = ip.split(",");
            for (int index = 0; index < ips.length; index++) {
                String strIp = (String) ips[index];
                if (!("unknown".equalsIgnoreCase(strIp))) {
                    ip = strIp;
                    break;
                }
            }
        }

        return ip;
    }

四·扩展接口，实现将黑名单IP写入redis当中，并返回当前所有黑名单IP

@RestController
public class IpBlackController {

    @Autowired(required = false)
    private CacheHelper cacheHelper;

    @PostMapping("/testIpBlack")
    public IpBlackBody IpBlack(@RequestBody IpBlackBody ipBlackBody) throws Exception {

        IpBlackBody body = new IpBlackBody();
        body = cacheHelper.get("IpBlack:ips", IpBlackBody.class);

        if (body != null) {
            //拼接当前IP与redis中现有ip
            linkArray(body.getIp(), ipBlackBody.getIp());
            //将数据赋给body
            body.setIp(linkArray(body.getIp(), ipBlackBody.getIp()));
            //setex中第二个参数时间为S，根据业务场景相应调整，此处我设置为一天
            //将body中拼接后的ip地址数据写入redis中
            cacheHelper.setex("IpBlack:ips", 86400, body);

        } else {
            cacheHelper.setex("IpBlack:ips", 86400, ipBlackBody);
            body = cacheHelper.get("IpBlack:ips", IpBlackBody.class);
            return body;
        }
        return body;
    }

    //拼接两个String[]的方法
    public static String[] linkArray(String[] array1, String[] array2) {

        List<String> list = new ArrayList<>();
        if (array1 == null) {
            return array2;
        }
        if (array2 == null) {
            return array1;
        }
        for (int i = 0; i < array1.length; i++) {
            list.add(array1[i]);
        }
        for (int i = 0; i < array2.length; i++) {
            list.add(array2[i]);
        }
        String[] returnValue = new String[list.size()];
        for (int i = 0; i < list.size(); i++) {

            returnValue[i] = list.get(i);
        }
        return returnValue;
    }

}

总结：首先根据需要拦截的controller拦截响应请求controller层，然后根据编写相关拦截器的具体实现，其中包含两部主要操作：
1.获取到远程请求主机的实际ip地址
2.对比当前ip是否在黑名单中（此次操作需要读取redis中的黑名单ip列表）
然后根据当前需求增加了一个redis接口，实现将需要封禁的IP地址增加到redis黑名单中并返回当前所有的黑名单IP地址。
至此:至此springboot通过拦截器实现拦截黑名单功能已经实现。