spring-cloud - 从 zuul 过滤器发送重定向

Question

我正在对我们的 zuul 过滤器集进行补充。这个附加过滤器将查看 header 并决定将请求重定向到我要配置的已知位置。

这是过滤器运行方法的主体

 @Override
    public Object run() {
        log.debug("Running the PreRouteTransMarkAndLoggingZuulFilter filter ");
        // retrieve redirect URL
        String redirectURL = filterConfigurationBean.getRedirectURL();
        if (redirectURL.isEmpty()) {
            return null;
        }
        // get the white list for allowed entries
        Set<String> whiteList = new HashSet<>(Arrays.asList(filterConfigurationBean.getWhiteList().split(",")));
        RequestContext ctx = RequestContext.getCurrentContext();
        // if request url is part of white list then allow
        String url = ctx.getRequest().getRequestURL().toString();
        if (checkWhiteList(url, whiteList)) {
            return null;
        }
        // get headers
        // check if an authorization header is present
        if (validHeader(ctx.getRequest())) {
            return null;
        }
        // if it got to here then if no header then redirect request
        try {
            ctx.getResponse().sendRedirect(redirectURL);
        } catch (IOException e) {
            log.error("unable to send a redirect to the login page");
        }
        return null;
    }

好的，所以我实现并测试了它(它被定义为预过滤器，因为我不希望在路由阶段发送请求。

在更远的地方，它抛出了异常。

2017-06-26 17:00:36.482  WARN 6267 --- [tp1303192419-23] o.s.c.n.z.filters.post.SendErrorFilter   : Error during filtering
com.netflix.zuul.exception.ZuulException: Filter threw Exception
    at com.netflix.zuul.FilterProcessor.processZuulFilter(FilterProcessor.java:227)
    at com.netflix.zuul.FilterProcessor.runFilters(FilterProcessor.java:157)
    at com.netflix.zuul.FilterProcessor.postRoute(FilterProcessor.java:92)
    at com.netflix.zuul.ZuulRunner.postRoute(ZuulRunner.java:87)
    at com.netflix.zuul.http.ZuulServlet.postRoute(ZuulServlet.java:107)
    at com.netflix.zuul.http.ZuulServlet.service(ZuulServlet.java:88)
    at org.springframework.web.servlet.mvc.ServletWrappingController.handleRequestInternal(ServletWrappingController.java:157)
    at org.springframework.cloud.netflix.zuul.web.ZuulController.handleRequest(ZuulController.java:44)
    at org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter.handle(SimpleControllerHandlerAdapter.java:50)
    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:967)
    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:901)
    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970)
    at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:861)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:687)
    at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
    at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:841)
    at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1650)
    at org.eclipse.jetty.websocket.server.WebSocketUpgradeFilter.doFilter(WebSocketUpgradeFilter.java:206)
    at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1637)
    at org.springframework.boot.web.filter.ApplicationContextHeaderFilter.doFilterInternal(ApplicationContextHeaderFilter.java:55)
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
    at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1637)
    at org.springframework.boot.actuate.trace.WebRequestTraceFilter.doFilterInternal(WebRequestTraceFilter.java:110)
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
    at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1637)
    at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:208)
    at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:177)
    at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:346)
    at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:262)
    at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1637)
    at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99)
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
    at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1637)
    at org.springframework.web.filter.HttpPutFormContentFilter.doFilterInternal(HttpPutFormContentFilter.java:105)
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
    at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1637)
    at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:81)
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
    at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1637)
    at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:197)
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
    at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1637)
    at org.springframework.boot.actuate.autoconfigure.MetricsFilter.doFilterInternal(MetricsFilter.java:106)
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
    at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1637)
    at com.cisco.phisphere.routerservice.BasicCORSFilter.doFilter(BasicCORSFilter.java:78)
    at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1637)
    at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:533)
    at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143)
    at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:548)
    at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132)
    at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:190)
    at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:1595)
    at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:188)
    at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1253)
    at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:168)
    at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:473)
    at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:1564)
    at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:166)
    at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1155)
    at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)
    at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132)
    at org.eclipse.jetty.server.Server.handle(Server.java:564)
    at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:317)
    at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:251)
    at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:279)
    at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:110)
    at org.eclipse.jetty.io.ChannelEndPoint$2.run(ChannelEndPoint.java:124)
    at org.eclipse.jetty.util.thread.Invocable.invokePreferred(Invocable.java:128)
    at org.eclipse.jetty.util.thread.Invocable$InvocableExecutor.invoke(Invocable.java:222)
    at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.doProduce(EatWhatYouKill.java:294)
    at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.produce(EatWhatYouKill.java:126)
    at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:672)
    at org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:590)
    at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.reflect.UndeclaredThrowableException: null
    at org.springframework.util.ReflectionUtils.rethrowRuntimeException(ReflectionUtils.java:317)
    at org.springframework.cloud.netflix.zuul.filters.post.SendResponseFilter.run(SendResponseFilter.java:115)
    at com.netflix.zuul.ZuulFilter.runFilter(ZuulFilter.java:112)
    at com.netflix.zuul.FilterProcessor.processZuulFilter(FilterProcessor.java:193)
    ... 75 common frames omitted
Caused by: org.eclipse.jetty.io.EofException: Closed
    at org.eclipse.jetty.server.HttpOutput.write(HttpOutput.java:476)
    at org.springframework.cloud.netflix.zuul.filters.post.SendResponseFilter.writeResponse(SendResponseFilter.java:214)
    at org.springframework.cloud.netflix.zuul.filters.post.SendResponseFilter.writeResponse(SendResponseFilter.java:183)
    at org.springframework.cloud.netflix.zuul.filters.post.SendResponseFilter.run(SendResponseFilter.java:112)
    ... 77 common frames omitted

所以我的问题是这样的。这是从 zuul 执行重定向的正确方法吗？

我有一个明确定义的重定向条件和一个明确定义的发送位置。如果条件成立，我不希望此请求继续，而是重定向到外部位置。

谢谢

Answer 1

好的，所以我尝试了一下并找到了答案。

您需要确保 RibbonRoutingFilter 不会通过设置 ctx.setSendZuulResponse(false) 来触发，因为该过滤器使用它来确定是否应该触发。

接下来设置 ctx.put(FORWARD_TO_KEY, redirectURL) 以确保 SendForward 过滤器将触发。将重定向URL 设置为您想要的位置。

同时设置 ctx.getResponse().sendRedirect(redirectURL) ，否则它将附加到原始服务的路由路径作为前缀，并且重定向将失败。

@Override
public Object run() {
    log.debug("Running the AuthorizationPassFilter filter ");

    // retrieve redirect URL
    String redirectURL = filterConfigurationBean.getRedirectURL();

    if (redirectURL.isEmpty()) {
        return null;
    }

    // get the white list for allowed entries
    Set<String> whiteList = new HashSet<>(Arrays.asList(filterConfigurationBean.getWhiteList().split(",")));

    RequestContext ctx = RequestContext.getCurrentContext();

    // if request url is part of white list then allow
    String url = ctx.getRequest().getRequestURL().toString();
    if (checkWhiteList(url, whiteList)) {
        return null;
    }

    // get headers
    // check if an authorization header is present
    if (validHeader(ctx.getRequest())) {
        return null;
    }

    // if it got to here then if no header then redirect request
    try {
        ctx.setSendZuulResponse(false);
        ctx.put(FORWARD_TO_KEY, redirectURL);
        ctx.setResponseStatusCode(HttpStatus.SC_TEMPORARY_REDIRECT);
        ctx.getResponse().sendRedirect(redirectURL);
    } catch (IOException e) {
        log.error("unable to send a redirect to the login page");
    }

    return null;

}