JwtFilter

import io.jsonwebtoken.Claims;
import lombok.extern.log4j.Log4j2;
import org.apache.commons.lang.StringUtils;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.annotation.Order;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.stereotype.Component;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

import java.util.Arrays;
import java.util.List;

@Component
@Log4j2
@Order(0)
public class AuthorizeFilter implements GlobalFilter {
List urlList = Arrays.asList(
“/v2/api-docs”,
“/login/in”
);
@Override
public Mono filter(ServerWebExchange exchange, GatewayFilterChain chain) {
//1. 获取请求对象和响应对象
ServerHttpRequest request = exchange.getRequest();
ServerHttpResponse response = exchange.getResponse();
//2. 判断当前的请求是否需要登录 如果不需要直接放行
String path = request.getURI().getPath(); // 请求uri路径
for (String url : urlList){
if(path.contains(url)){
return chain.filter(exchange); // chain 放行
}
}
//3. 其它路径需要获取请求头中的token
HttpHeaders headers = request.getHeaders();
String jwtToken = headers.getFirst(“token”);
//4. 判断token是否存在
if (StringUtils.isEmpty(jwtToken)) {
// 如果不存在,向客户端返回错误提示信息
response.setStatusCode(HttpStatus.UNAUTHORIZED);
return response.setComplete();
}
try {
//5. 如果令牌存在，解析jwt令牌 判断令牌是否合法
Claims claims = AppJwtUtil.getClaimsBody(jwtToken);
int result = AppJwtUtil.verifyToken(claims);
if(result == 0 || result == -1){
// 5.1 合法 则向header中重新设置userId
Integer id = (int) claims.get(“id”);
log.info(“find userid;{} from uri: {}”,id,request.getURI());
// 重新设置token到header中
ServerHttpRequest serverHttpRequest = request.mutate().headers(httpHeaders -> {
httpHeaders.add(“userId”, String.valueOf(id));
}).build();
exchange = exchange.mutate().request(serverHttpRequest).build();
return chain.filter(exchange);
}
}catch (Exception e){
e.printStackTrace();
}
//6.放行
response.setStatusCode(HttpStatus.UNAUTHORIZED);
return response.setComplete();
}
}