优雅的接口防刷处理方案！ 下

@Configuration
public class SignFilterConfiguration {
    @Value("${sign.maxTime}")
    private String signMaxTime;
    //filter中的初始化参数
    private Map<String, String> initParametersMap =  new HashMap<>();
    @Bean
    public FilterRegistrationBean contextFilterRegistrationBean() {
        initParametersMap.put("signMaxTime",signMaxTime);
        FilterRegistrationBean registration = new FilterRegistrationBean();
        registration.setFilter(signFilter());
        registration.setInitParameters(initParametersMap);
        registration.addUrlPatterns("/sign/*");
        registration.setName("SignFilter");
        // 设置过滤器被调用的顺序
        registration.setOrder(1);
        return registration;
    }
    @Bean
    public Filter signFilter() {
        return new SignFilter();
    }
}
@Slf4j
public class SignFilter implements Filter {
    @Resource
    private RedisUtil redisUtil;
    //从fitler配置中获取sign过期时间
    private Long signMaxTime;
    private static final String NONCE_KEY = "x-nonce-";
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest httpRequest = (HttpServletRequest) servletRequest;
        HttpServletResponse httpResponse = (HttpServletResponse) servletResponse;
        log.info("过滤URL:{}", httpRequest.getRequestURI());
        HttpServletRequestWrapper requestWrapper = new SignRequestWrapper(httpRequest);
        //构建请求头
        RequestHeader requestHeader = RequestHeader.builder()
                .nonce(httpRequest.getHeader("x-Nonce"))
                .timestamp(Long.parseLong(httpRequest.getHeader("X-Time")))
                .sign(httpRequest.getHeader("X-Sign"))
                .build();
        //验证请求头是否存在
        if(StringUtils.isEmpty(requestHeader.getSign()) || ObjectUtils.isEmpty(requestHeader.getTimestamp()) || StringUtils.isEmpty(requestHeader.getNonce())){
            responseFail(httpResponse, ReturnCode.ILLEGAL_HEADER);
            return;
        }
        /*
         * 1.重放验证
         * 判断timestamp时间戳与当前时间是否操过60s（过期时间根据业务情况设置）,如果超过了就提示签名过期。
         */
        long now = System.currentTimeMillis() / 1000;
        if (now - requestHeader.getTimestamp() > signMaxTime) {
            responseFail(httpResponse,ReturnCode.REPLAY_ERROR);
            return;
        }
        //2. 判断nonce
        boolean nonceExists = redisUtil.hasKey(NONCE_KEY + requestHeader.getNonce());
        if(nonceExists){
            //请求重复
            responseFail(httpResponse,ReturnCode.REPLAY_ERROR);
            return;
        }else {
            redisUtil.set(NONCE_KEY+requestHeader.getNonce(), requestHeader.getNonce(), signMaxTime);
        }
        boolean accept;
        SortedMap<String, String> paramMap;
        switch (httpRequest.getMethod()){
            case "GET":
                paramMap = HttpDataUtil.getUrlParams(requestWrapper);
                accept = SignUtil.verifySign(paramMap, requestHeader);
                break;
            case "POST":
                paramMap = HttpDataUtil.getBodyParams(requestWrapper);
                accept = SignUtil.verifySign(paramMap, requestHeader);
                break;
            default:
                accept = true;
                break;
        }
        if (accept) {
            filterChain.doFilter(requestWrapper, servletResponse);
        } else {
            responseFail(httpResponse,ReturnCode.ARGUMENT_ERROR);
            return;
        }
    }
    private void responseFail(HttpServletResponse httpResponse, ReturnCode returnCode)  {
        ResultData<Object> resultData = ResultData.fail(returnCode.getCode(), returnCode.getMessage());
        WebUtils.writeJson(httpResponse,resultData);
    }
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
        String signTime = filterConfig.getInitParameter("signMaxTime");
        signMaxTime = Long.parseLong(signTime);
    }
}

@Component
public class RedisUtil {
    @Resource
    private RedisTemplate<String, Object> redisTemplate;
    /**
     * 判断key是否存在
     * @param key 键
     * @return true 存在 false不存在
     */
    public boolean hasKey(String key) {
        try {
            return Boolean.TRUE.equals(redisTemplate.hasKey(key));
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }
    }
    /**
     * 普通缓存放入并设置时间
     * @param key   键
     * @param value 值
     * @param time  时间(秒) time要大于0 如果time小于等于0 将设置无限期
     * @return true成功 false 失败
     */
    public boolean set(String key, Object value, long time) {
        try {
            if (time > 0) {
                redisTemplate.opsForValue().set(key, value, time, TimeUnit.SECONDS);
            } else {
                set(key, value);
            }
            return true;
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }
    }
    /**
     * 普通缓存放入
     * @param key   键
     * @param value 值
     * @return true成功 false失败
     */
    public boolean set(String key, Object value) {
        try {
            redisTemplate.opsForValue().set(key, value);
            return true;
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }
    }
}