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java 过滤器 接口（API）验证入参，验签（sign） Demo

一、思路
1、配置yml文件;
2、创建加载配置文件类;
3、继承 OncePerRequestFilter 重写方法 doFilterInternal;
4、注册自定义过滤器;


二、步骤

1、配置yml文件;
###系统签名验证配置
biw:
  ###过滤器开关是否打开
  enable: true
  ###过滤器-验签秘钥（自定义一个字符串）
  securityKey: ccf12f15155c9c564daf1783a6f65f69a4a0
  ###过滤器-URL
  urlPathPatterns: /test/test001/*,/com/baidu006/*

2、创建加载配置文件类;

import lombok.Data;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.stereotype.Component;/*** @Author * @create 2023/07/18*/
@Data
@Component
@ConfigurationProperties(prefix = "biw")
public class BiwConfig {/*** 系统通讯密钥*/private String securityKey;/*** 签名验证URL路径*/private String urlPathPatterns;/*** 是否开启签名验证*/private Boolean enable;}

3、继承 OncePerRequestFilter 重写方法 doFilterInternal;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.test.baidu.ResultCodeEnum;
import com.test.baidu.config.BiwConfig;
import com.test.baidu.common.model.Result;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.codec.digest.DigestUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.web.filter.OncePerRequestFilter;import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.ServletRequest;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.nio.charset.Charset;
import java.util.Iterator;
import java.util.Map;
import java.util.TreeMap;/*** BIW系统接口鉴权过滤器** @Author * @Date 2023/07/18*/
@Slf4j
@Component
public class BiwSignFilter extends OncePerRequestFilter {@Autowiredprivate BiwConfig biwConfig;private final String SIGN_FIELD_NAME = "sign";private final String KEY_FIELD_NAME = "key";/*** doFilterInternal** @param request* @param response* @param filterChain* @throws ServletException* @throws IOException*/@Overrideprotected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain) throws ServletException, IOException {try {ServletRequest requestWrapper = new RequestWrapper((HttpServletRequest) request);// 判断签名验证开关是否开启if (!biwConfig.getEnable()) {filterChain.doFilter(requestWrapper, response);return;}String bodyText = this.readHttpBody(requestWrapper);log.info("[系统接口鉴权]body内容: {}", bodyText);JSONObject jsonBody = JSONObject.parseObject(bodyText);Object signRequest = jsonBody.get(SIGN_FIELD_NAME);if (biwConfig.getEnable() && null == signRequest) {log.error("签名信息不存在");this.doReturn(response, Result.createError(ResultCodeEnum.SIGN_NOT_EXISTS.getCode(), ResultCodeEnum.SIGN_NOT_EXISTS.getMessage()));return;}String sign = this.signMD5(jsonBody);// 验证签名if (biwConfig.getEnable() && !sign.equals(signRequest)) {log.error("签名验证失败, 签名计算值 {} 签名请求值{} body内容{}", sign, signRequest, bodyText);this.doReturn(response, Result.createError(ResultCodeEnum.SIGN_ERROR.getCode(), ResultCodeEnum.SIGN_ERROR.getMessage()));return;}filterChain.doFilter(requestWrapper, response);} catch (Exception e) {log.error("签名验证异常", e);this.doReturn(response, Result.create500Error(e.getMessage()));return;}}/*** readHttpBody** @param requestWrapper* @return* @throws IOException*/private String readHttpBody(ServletRequest requestWrapper) throws IOException {BufferedReader reader = new BufferedReader(new InputStreamReader(requestWrapper.getInputStream(), Charset.forName("UTF-8")));String line = "";StringBuilder sb = new StringBuilder();while ((line = reader.readLine()) != null) {sb.append(line);}return sb.toString();}/*** doReturn** @param response* @param result* @throws IOException*/private void doReturn(HttpServletResponse response, Result result) throws IOException {ServletOutputStream out = response.getOutputStream();out.write(JSON.toJSONString(result).getBytes());out.flush();}/*** signMD5 : MD5签名加密** @param jsonObject* @return*/public String signMD5(JSONObject jsonObject) {Iterator it = jsonObject.getInnerMap().keySet().iterator();Map<String, Object> map = new TreeMap<String, Object>();StringBuilder signSb = new StringBuilder();while (it.hasNext()) {Object key = it.next();Object value = jsonObject.get(key);if (SIGN_FIELD_NAME.equals(key)) {continue;}map.put(key.toString(), value);}for (Map.Entry<String, Object> entry : map.entrySet()) {signSb.append(entry.getKey());signSb.append("=");signSb.append(entry.getValue());signSb.append("&");}signSb.append(KEY_FIELD_NAME).append("=").append(biwConfig.getSecurityKey());String sign = DigestUtils.md5Hex(signSb.toString()).toUpperCase();return sign;}/*** 生成签名*/public static void main(String[] args) {String json = "{\"endTime\":\"2023-07-01 08:00:00\",\"startTime\":\"2023-07-01 00:00:00\",\"pageNum\":1,\"pageSize\":50,\"requestId\":\"test001\"}";JSONObject jsonObject = JSON.parseObject(json);Iterator it = jsonObject.getInnerMap().keySet().iterator();Map<String, Object> map = new TreeMap<String, Object>();StringBuilder signSb = new StringBuilder();while (it.hasNext()) {Object key = it.next();Object value = jsonObject.get(key);if ("sign".equals(key)) {continue;}map.put(key.toString(), value);}for (Map.Entry<String, Object> entry : map.entrySet()) {signSb.append(entry.getKey());signSb.append("=");signSb.append(entry.getValue());signSb.append("&");}signSb.append("key").append("=").append("ccf12f15155c9c564daf1783a6f65f69a4a0");String sign = DigestUtils.md5Hex(signSb.toString()).toUpperCase();System.out.println(sign);}}

4、注册自定义过滤器;

import com.test.baidu.config.BiwConfig;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;/*** @Author * @date 2023/07/18* @description: 系统过滤配置*/
@Configuration
public class BiwFilterConfig {@Autowiredprivate BiwSignFilter biwSignFilter;@Autowiredprivate BiwConfig biwConfig;/*** biwBillPullFilterConfig* 数据-签名过滤** @return*/@Beanpublic FilterRegistrationBean<BiwSignFilter> biwBillPullFilterConfig() {FilterRegistrationBean<BiwSignFilter> registration = new FilterRegistrationBean<>();// 注册自定义过滤器registration.setFilter(biwSignFilter);// 过滤所有路径// registration.addUrlPatterns(biwConfig.getUrlPathPatterns().split(","));registration.addUrlPatterns(biwConfig.getUrlPathPatterns());// 过滤器名称registration.setName("biwParametersFilter");// 优先级，越低越优先registration.setOrder(1);return registration;}}

5、每次调用此方法时将数据流中的数据读取出来，然后再回填到InputStream之中

解决通过@RequestBody和@RequestParam（POST方式）读取一次后控制器拿不到参数问题

import org.apache.commons.io.IOUtils;import javax.servlet.ReadListener;
import javax.servlet.ServletInputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;
import java.io.*;/*** @Author * @create 2023/07/18*/
public class RequestWrapper extends HttpServletRequestWrapper {private byte[] requestBody;private HttpServletRequest request;public RequestWrapper(HttpServletRequest request) throws IOException {super(request);this.request = request;}@Overridepublic ServletInputStream getInputStream() throws IOException {/*** 每次调用此方法时将数据流中的数据读取出来，然后再回填到InputStream之中* 解决通过@RequestBody和@RequestParam（POST方式）读取一次后控制器拿不到参数问题*/if (null == this.requestBody) {ByteArrayOutputStream baos = new ByteArrayOutputStream();IOUtils.copy(request.getInputStream(), baos);this.requestBody = baos.toByteArray();}final ByteArrayInputStream bais = new ByteArrayInputStream(requestBody);return new ServletInputStream() {@Overridepublic boolean isFinished() {return false;}@Overridepublic boolean isReady() {return false;}@Overridepublic void setReadListener(ReadListener listener) {}@Overridepublic int read() {return bais.read();}};}public byte[] getRequestBody() {return requestBody;}@Overridepublic BufferedReader getReader() throws IOException {return new BufferedReader(new InputStreamReader(this.getInputStream()));}
}