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.activemq.artemis.utils;
  
  import io.netty.channel.Channel;
  import io.netty.util.AttributeKey;
  
  public class ProxyProtocolUtil {
     public static final AttributeKey<String> PROXY_PROTOCOL_SOURCE_ADDRESS = AttributeKey.valueOf("proxyProtocolSourceAddress");
     public static final AttributeKey<String> PROXY_PROTOCOL_DESTINATION_ADDRESS = AttributeKey.valueOf("proxyProtocolDestinationAddress");
     public static final AttributeKey<String> PROXY_PROTOCOL_VERSION = AttributeKey.valueOf("proxyProtocolVersion");
  
     /**
      * {@return a string representation of the remote address of this Channel taking into account whether the PROXY
      * protocol was used by the remote client}
      */
     public static String getRemoteAddress(Channel channel) {
        String addressFromAttribute = getAddressFromAttribute(PROXY_PROTOCOL_SOURCE_ADDRESS, channel);
        if (addressFromAttribute != null) {
           return addressFromAttribute;
        } else {
           return SocketAddressUtil.toString(channel.remoteAddress());
        }
     }
  
     /**
      * {@return a string representation of the proxy address of this Channel if and only if the PROXY protocol was used
      * by the remote client; otherwise null}
      */
     public static String getProxyAddress(Channel channel) {
        return getAddressFromAttribute(PROXY_PROTOCOL_DESTINATION_ADDRESS, channel);
     }
  
     private static String getAddressFromAttribute(AttributeKey<String> addressKey, Channel channel) {
        String address = channel.attr(addressKey).get();
        if (address != null && !address.isEmpty()) {
           return address;
        } else {
           return null;
        }
     }
  
     public static String getProxyProtocolVersion(Channel channel) {
        return channel.attr(PROXY_PROTOCOL_VERSION).get() == null ? null : channel.attr(PROXY_PROTOCOL_VERSION).get().toString();
     }
  }
  