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 */ }