gateway和jwt网关认证实现过程解析

这篇文章主要介绍了gateway和jwt网关认证实现过程解析,文中通过示例代码介绍的非常详细，对大家的学习或者工作具有一定的参考学习价值,需要的朋友可以参考下

思路： 全局过滤器对所有的请求拦截（生成token有效期30分钟，放入redis设置有效期3天。3天之类可以通过刷新接口自动刷新，超过3天需要重新登录。）

前端在调用接口之前先判断token是否过期（3o分钟），过期则先调刷新接口，换取新token,

1引入相关jar

<dependency>
      <groupId>org.springframework.cloud</groupId>
      <artifactId>spring-cloud-starter-gateway</artifactId>
</dependency>
<dependency>
      <groupId>io.jsonwebtoken</groupId>
      <artifactId>jjwt</artifactId>
      <version>0.9.0</version>
</dependency>

2编写Jwt工具类（生成token + 解析token）

package spring.cloud.gateway.common;

import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;
import io.jsonwebtoken.ExpiredJwtException;
import org.springframework.util.StringUtils;
import io.jsonwebtoken.Jwts;
import io.jsonwebtoken.SignatureAlgorithm;

public class JwtUtil {
  public static final String SECRET = "qazwsx123444$#%#()*&& asdaswwi1235 ?;!@#kmmmpom in***xx**&";
  public static final String TOKEN_PREFIX = "Bearer";
  public static final String LOGIN_URL = "/token/userId/pwd";
  public static final String LOGOUT_URL = "/token/userId";
  public static final String HEADER_AUTH = "authorization";
  public static final String HEADER_USERID = "userid";
  //token超时时间
  public static final int TOKEN_EXPIRATION_MINUTE = 30;
  //token的redis超时时间
  public static final int TOKEN_REDIS_EXPIRATION_DAY = 7;

  public static String generateToken(String userId) {
    Calendar calendar = Calendar.getInstance();
    calendar.add(Calendar.MINUTE, TOKEN_EXPIRATION_MINUTE); //得到前一天
    Date date = calendar.getTime();
    DateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
    df.format(date);
    //todo 优化token的生层规则
    HashMap<String, Object> map = new HashMap<>();
    map.put(HEADER_USERID, userId);
    String jwt = Jwts.builder()
        .setSubject(HEADER_USERID).setClaims(map)
        .setExpiration(date)
        .signWith(SignatureAlgorithm.HS512, SECRET)
        .compact();
    return TOKEN_PREFIX + " " + jwt;
  }

  public static Map<String, String> validateToken(String token) {
    HashMap<String, String> tokenMap = new HashMap<String, String>();
    if (StringUtils.isEmpty(token)) {
      return tokenMap;
    }
    try {
      Map<String, Object> tokenBody = Jwts.parser()
          .setSigningKey(SECRET)
          .parseClaimsJws(token.replace(TOKEN_PREFIX, ""))
          .getBody();
      String userId = String.valueOf(tokenBody.get(HEADER_USERID));
      tokenMap.put(HEADER_USERID, userId);
    }catch (ExpiredJwtException e){
      e.printStackTrace();
    }
    return tokenMap;
  }

  /**
   * 移到jwtUtil中去
   *
   * @param token
   * @return
   */
  public static Map<String, String> validateTokenAndUser(String token, String userIdIn) {
    Map<String, String> tokenResultMap = new HashMap<>();
    if (StringUtils.isEmpty(token) || StringUtils.isEmpty(userIdIn)) {
      return tokenResultMap;
    }
    tokenResultMap = validateToken(token);
    if (StringUtils.isEmpty(token) || StringUtils.isEmpty(userIdIn)) {
      return tokenResultMap;
    }
    //判断传入的userid和token是否匹配
    String userIdOri = tokenResultMap.get(HEADER_USERID);
    if (!userIdIn.equals(userIdOri)) {
      return new HashMap<String,String>();
    }
    return tokenResultMap;
  }

}

3编写过滤器类

package spring.cloud.gateway.filter;

import java.net.URI;
import java.util.Map;
import org.apache.commons.lang.StringUtils;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.cloud.gateway.route.Route;
import org.springframework.cloud.gateway.support.ServerWebExchangeUtils;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpMethod;
import org.springframework.http.server.PathContainer;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.stereotype.Component;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;
import spring.cloud.gateway.common.JwtUtil;
import spring.cloud.gateway.exception.PermissionException;

/**
 * 参数参考 https://blog.csdn.net/tianyaleixiaowu/article/details/83375246
 * response参考 https://bbs.csdn.net/topics/392412604?list=11074255
 */
@Component
public class AuthFilter implements GlobalFilter {

  @Override
  public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
    ServerHttpRequest request = exchange.getRequest();
    HttpHeaders header = request.getHeaders();
    HttpMethod method = request.getMethod();
    String token = header.getFirst(JwtUtil.HEADER_AUTH);
    String userId = header.getFirst(JwtUtil.HEADER_USERID);
    PathContainer pathContainer = request.getPath().pathWithinApplication();
    String path = pathContainer.value();

    //2- 处理登录请求
    if (StringUtils.isBlank(token)) {
      //是登录接口则放行，否则返回异常
      if (path.contains(JwtUtil.LOGIN_URL) && HttpMethod.POST.equals(method)) {
        throw new PermissionException("please login");
      }
      return chain.filter(exchange);
    }

    //3- 处理刷新token请求
    if (path.indexOf("refresh") >= 0) {
      //放行去掉刷新接口（在刷新前校验userId和token是否匹配）
      return chain.filter(exchange);
    }

    //4- 处理刷新token请求
    if (path.contains(JwtUtil.LOGOUT_URL) && HttpMethod.DELETE.equals(method)) {
      //放行去掉登出接口（在刷新前校验userId和token是否匹配）
      return chain.filter(exchange);
    }

    //5- 携带token请求其他业务接口
    Map<String, String> validateResultMap = JwtUtil.validateTokenAndUser(token, userId);
    if (validateResultMap == null || validateResultMap.isEmpty()) {
      throw new PermissionException("token 已经失效");
    }
    // TODO 将用户信息存放在请求header中传递给下游业务
    Route gatewayUrl = exchange.getRequiredAttribute(ServerWebExchangeUtils.GATEWAY_ROUTE_ATTR);
    URI uri = gatewayUrl.getUri();
    //表示下游请求对应的服务名如 SPRING-CLOUD-SERVICE SPRING-CLOUD-GATEWAY
    String serviceName = uri.getHost();

    ServerHttpRequest.Builder mutate = request.mutate();
    mutate.header("x-user-id", validateResultMap.get("userid"));
    mutate.header("x-user-name", validateResultMap.get("user"));
    mutate.header("x-user-serviceName", serviceName);
    ServerHttpRequest buildReuqest = mutate.build();

    //todo 如果响应中需要放数据，也可以放在response的header中
    //ServerHttpResponse response = exchange.getResponse();
    //response.getHeaders().add("new_token","token_value");
    return chain.filter(exchange.mutate().request(buildReuqest).build());
  }
}

4编写相关接口API

package spring.cloud.gateway.controller;
import org.springframework.web.bind.annotation.*;
import spring.cloud.gateway.common.JwtUtil;
import java.util.Map;
@RestController
@RequestMapping("/token")
public class TokenController {

  /**
   * 登录接口
   * @param user（userID +pwd）
   * @return
   */
  @PostMapping("/userId/pwd")
  public String getToken(@RequestBody Map<String,String> user) {
    //用户名密码需要加密处理
    String result = "";
    if (user == null || user.isEmpty()) {
      return result;
    }
    String userId = user.get("userId");
    String pwd = user.get("pwd");
    if (!doLogin(userId,pwd)) {
      return result;
    }
    String token = JwtUtil.generateToken(userId);
    // todo 将token放入redis中，设置超时时间为 2 * t
    return token;
  }

  private Boolean doLogin(String userId,String pwd) {
    //后续对接user表验证
    if ("admin".equals(userId) && "123".equals(pwd)) {
      return true;
    }
    if ("spring".equals(userId) && "123".equals(pwd)) {
      return true;
    }
    if ("gateway".equals(userId) && "123".equals(pwd)) {
      return true;
    }
    return false;
  }
  /**
   * 登出接口
   */
  /**
   * 刷新token的接口
   * 在刷新前校验userId和token是否匹配
   */
}

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