/*
* Copyright 2013-2015 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springframework.cloud.netflix.zuul.filters.route;
import javax.servlet.RequestDispatcher;
import org.springframework.util.ReflectionUtils;
import com.netflix.zuul.ZuulFilter;
import com.netflix.zuul.context.RequestContext;
import static org.springframework.cloud.netflix.zuul.filters.support.FilterConstants.FORWARD_TO_KEY;
import static org.springframework.cloud.netflix.zuul.filters.support.FilterConstants.ROUTE_TYPE;
import static org.springframework.cloud.netflix.zuul.filters.support.FilterConstants.SEND_FORWARD_FILTER_ORDER;
/**
* Route {@link ZuulFilter} that forwards requests using the {@link RequestDispatcher}.
* Forwarding location is located in the {@link RequestContext} attribute {@link org.springframework.cloud.netflix.zuul.filters.support.FilterConstants#FORWARD_TO_KEY}.
* Useful for forwarding to endpoints in the current application.
*
* @author Dave Syer
*/
public class SendForwardFilter extends ZuulFilter {
protected static final String SEND_FORWARD_FILTER_RAN = "sendForwardFilter.ran";
@Override
public String filterType() {
return ROUTE_TYPE;
}
@Override
public int filterOrder() {
return SEND_FORWARD_FILTER_ORDER;
}
@Override
public boolean shouldFilter() {
RequestContext ctx = RequestContext.getCurrentContext();
return ctx.containsKey(FORWARD_TO_KEY)
&& !ctx.getBoolean(SEND_FORWARD_FILTER_RAN, false);
}
@Override
public Object run() {
try {
RequestContext ctx = RequestContext.getCurrentContext();
String path = (String) ctx.get(FORWARD_TO_KEY);
RequestDispatcher dispatcher = ctx.getRequest().getRequestDispatcher(path);
if (dispatcher != null) {
ctx.set(SEND_FORWARD_FILTER_RAN, true);
if (!ctx.getResponse().isCommitted()) {
dispatcher.forward(ctx.getRequest(), ctx.getResponse());
ctx.getResponse().flushBuffer();
}
}
}
catch (Exception ex) {
ReflectionUtils.rethrowRuntimeException(ex);
}
return null;
}
}