content: /*
   * 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.camel.component.grpc.server;
  
  import io.grpc.Context;
  import io.grpc.Contexts;
  import io.grpc.Metadata;
  import io.grpc.ServerCall;
  import io.grpc.ServerCall.Listener;
  import io.grpc.ServerCallHandler;
  import io.grpc.ServerInterceptor;
  import io.grpc.internal.GrpcUtil;
  import org.apache.camel.Exchange;
  import org.apache.camel.component.grpc.GrpcConstants;
  
  /**
   * gRPC server header interceptor
   */
  public class GrpcHeaderInterceptor implements ServerInterceptor {
      public static final Context.Key<String> USER_AGENT_CONTEXT_KEY = Context.key(GrpcConstants.GRPC_USER_AGENT_HEADER);
      public static final Context.Key<String> CONTENT_TYPE_CONTEXT_KEY = Context.key(Exchange.CONTENT_TYPE);
  
      @Override
      public <ReqT, RespT> Listener<ReqT> interceptCall(
              ServerCall<ReqT, RespT> call, Metadata requestHeaders, ServerCallHandler<ReqT, RespT> next) {
          Context context = Context.current()
                  .withValue(USER_AGENT_CONTEXT_KEY, requestHeaders.get(GrpcUtil.USER_AGENT_KEY))
                  .withValue(CONTENT_TYPE_CONTEXT_KEY, requestHeaders.get(GrpcUtil.CONTENT_TYPE_KEY));
  
          return Contexts.interceptCall(context, call, requestHeaders, next);
      }
  }
  