dubbo-rpc-extensions/dubbo-rpc-rest/src/main/java/org/apache/dubbo/rpc/protocol/rest/extension/resteasy/filter/ResteasyResponseContainerFilterAdapter.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.apache.dubbo.rpc.protocol.rest.extension.resteasy.filter;

import org.apache.dubbo.common.URL;
import org.apache.dubbo.common.extension.Activate;
import org.apache.dubbo.rpc.protocol.rest.deploy.ServiceDeployer;
import org.apache.dubbo.rpc.protocol.rest.extension.resteasy.ResteasyContext;
import org.apache.dubbo.rpc.protocol.rest.filter.RestResponseFilter;
import org.apache.dubbo.rpc.protocol.rest.filter.context.RestFilterContext;
import org.apache.dubbo.rpc.protocol.rest.netty.NettyHttpResponse;
import org.apache.dubbo.rpc.protocol.rest.request.RequestFacade;
import org.jboss.resteasy.spi.HttpResponse;

import javax.ws.rs.container.ContainerResponseFilter;
import java.util.List;

@Activate(
        value = "resteasy",
        order = Integer.MAX_VALUE - 1000,
        onClass = {
            "org.jboss.resteasy.specimpl.BuiltResponse",
            "javax.ws.rs.container.ContainerResponseFilter",
            "org.jboss.resteasy.spi.HttpResponse",
            "org.jboss.resteasy.plugins.server.netty.NettyHttpResponse"
        })
public class ResteasyResponseContainerFilterAdapter implements RestResponseFilter, ResteasyContext {
    @Override
    public void filter(RestFilterContext restFilterContext) throws Exception {

        ServiceDeployer serviceDeployer = restFilterContext.getServiceDeployer();
        RequestFacade requestFacade = restFilterContext.getRequestFacade();
        NettyHttpResponse response = restFilterContext.getResponse();
        URL url = restFilterContext.getUrl();
        List<ContainerResponseFilter> containerRequestFilters =
                getExtension(serviceDeployer, ContainerResponseFilter.class);

        if (containerRequestFilters.isEmpty()) {
            return;
        }

        // response filter entity first

        // build jaxrsResponse from rest netty response
        DubboBuiltResponse dubboBuiltResponse =
                new DubboBuiltResponse(response.getResponseBody(), response.getStatus(), response.getEntityClass());
        // NettyHttpResponse wrapper
        HttpResponse httpResponse = new ResteasyNettyHttpResponse(response);
        DubboContainerResponseContextImpl containerResponseContext = createContainerResponseContext(
                restFilterContext.getOriginRequest(),
                requestFacade,
                httpResponse,
                dubboBuiltResponse,
                containerRequestFilters.toArray(new ContainerResponseFilter[0]));
        containerResponseContext.filter();

        // user reset entity
        if (dubboBuiltResponse.hasEntity() && dubboBuiltResponse.isResetEntity()) {
            // clean  output stream data
            restOutputStream(response);
            writeResteasyResponse(url, requestFacade, response, dubboBuiltResponse);
        }
        addResponseHeaders(response, httpResponse.getOutputHeaders());

        restFilterContext.setComplete(true);
    }
}