Question

我在云api网关中添加了一些身份验证逻辑。我添加了GatewayFilter：

import java.util.List;

import org.springframework.cloud.gateway.filter.GatewayFilter;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.http.HttpStatus;
import org.springframework.util.CollectionUtils;
import org.springframework.util.PatternMatchUtils;
import org.springframework.web.server.ServerWebExchange;

import reactor.core.publisher.Mono;

public class AuthorizationFilter implements GatewayFilter {
  @Override
  public Mono<Void> filter(
    ServerWebExchange exchange, GatewayFilterChain chain) {
    List<String> authorization = exchange.getRequest().getHeaders().get("Authorization");
    if (CollectionUtils.isEmpty(authorization) &&
      !PatternMatchUtils.simpleMatch(URL_WITHOUT_AUTH, exchange.getRequest().getURI().toString())) {
      exchange.getResponse().setStatusCode(HttpStatus.UNAUTHORIZED);
      //Add some custom data in body of the response
      return exchange.getResponse().setComplete();
    }
    String token = authorization.get(0).split(" ")[1];
    // token validation
    return chain.filter(exchange);
  }
}

但我无法在响应体中添加一些数据。你能帮助我找出它的工作原理以及我如何定制它吗？

P.S。我尝试使用flux添加一些数据，但它不起作用：

 DataBuffer b = exchange.getResponse().bufferFactory().allocateBuffer(256);
      b.write("12345".getBytes());
      return exchange.getResponse().writeWith(s -> Flux.just(b));

我做错了什么？

Answer 1

在春天的帮助下，我能够让它发挥作用。因此，不必直接写入响应，而是必须抛出自定义异常并正确处理它：

@Bean
public ErrorWebExceptionHandler myExceptionHandler() {
  return new MyWebExceptionHandler();
}

public class MyWebExceptionHandler implements ErrorWebExceptionHandler {
  @Override
  public Mono<Void> handle(
    ServerWebExchange exchange, Throwable ex) {
    byte[] bytes = "Some text".getBytes(StandardCharsets.UTF_8);
    DataBuffer buffer = exchange.getResponse().bufferFactory().wrap(bytes);
    return exchange.getResponse().writeWith(Flux.just(buffer));
  }
}

Answer 2

这是一个有效的解决方案

import java.util.List;
import org.springframework.cloud.gateway.filter.GatewayFilter;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.core.io.buffer.DefaultDataBufferFactory;
import org.springframework.http.HttpStatus;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Flux;
import reactor.core.publisher.Mono;

public class AuthorizationFilter implements GatewayFilter {
  @Override
  public Mono<Void> filter(
      ServerWebExchange exchange, GatewayFilterChain chain) {
   if (isAuthorizationTokenValid(exchange.getRequest().getHeaders().get("Authorization"))) 
       return chain.filter(exchange);
    exchange.getResponse().setStatusCode(HttpStatus.UNAUTHORIZED);
    //Add some custom data in body of the response,
    //Returning "Unauthorized" in the body here
    return exchange.getResponse().writeWith(Flux.just(new DefaultDataBufferFactory().wrap("Unauthorized".getBytes())));
  }
  private boolean isAuthorizationTokenValid(List<String> authorizationTokens){
    //Your logic here
    return true;
  }
}

Answer 3

您应该使用figure; spy; my_fig=groot; cnt = 0; pause(0.05) while ~isempty(my_fig.Children) cnt=cnt+1 pause(0.01) end来修改回复。

您的代码应该是：

ServerHttpResponseDecorator

您可以找到a complete example here。

如何在Cloud Api Gateway的响应主体中添加一些数据

3 个答案: