edge/edge-core/src/main/java/org/apache/servicecomb/edge/core/EdgeAddHeaderFilter.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.servicecomb.edge.core;

import java.util.concurrent.CompletableFuture;

import javax.annotation.Nonnull;

import org.apache.servicecomb.core.Invocation;
import org.apache.servicecomb.core.filter.ConsumerFilter;
import org.apache.servicecomb.core.filter.FilterNode;
import org.apache.servicecomb.swagger.invocation.Response;
import org.apache.servicecomb.transport.rest.client.RestClientTransportContext;
import org.springframework.stereotype.Component;

@Component
public class EdgeAddHeaderFilter implements ConsumerFilter {
  public static final String NAME = "edge-add-headers";

  private final EdgeAddHeaderClientFilter filter = new EdgeAddHeaderClientFilter();

  @Nonnull
  @Override
  public String getName() {
    return NAME;
  }

  @Override
  public boolean isEnabled() {
    return filter.enabled();
  }

  @Override
  public CompletableFuture<Response> onFilter(Invocation invocation, FilterNode nextNode) {
    RestClientTransportContext transportContext = invocation.getTransportContext();
    return CompletableFuture.completedFuture(null)
        .thenAccept(v -> filter.addHeaders(invocation, transportContext.getHttpClientRequest()::putHeader))
        .thenCompose(v -> nextNode.onFilter(invocation));
  }
}