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The core jetty server artifact.
There is a newer version: 12.1.0.alpha0
//
// ========================================================================
// Copyright (c) 1995 Mort Bay Consulting Pty Ltd and others.
//
// This program and the accompanying materials are made available under the
// terms of the Eclipse Public License v. 2.0 which is available at
// https://www.eclipse.org/legal/epl-2.0, or the Apache License, Version 2.0
// which is available at https://www.apache.org/licenses/LICENSE-2.0.
//
// SPDX-License-Identifier: EPL-2.0 OR Apache-2.0
// ========================================================================
//

package org.eclipse.jetty.server;

import java.net.InetSocketAddress;
import java.net.SocketAddress;
import java.util.HashSet;
import java.util.Set;

import org.eclipse.jetty.http.HttpFields;
import org.eclipse.jetty.io.EndPoint;

/**
 * Customizer that extracts the real local and remote address:port pairs from a {@link ProxyConnectionFactory}
 * and sets them on the request with {@link Request#setAttribute(String, Object)}.
 */
public class ProxyCustomizer implements HttpConfiguration.Customizer
{
    /**
     * The remote address attribute name.
     */
    public static final String REMOTE_ADDRESS_ATTRIBUTE_NAME = "org.eclipse.jetty.proxy.remote.address";

    /**
     * The remote port attribute name.
     */
    public static final String REMOTE_PORT_ATTRIBUTE_NAME = "org.eclipse.jetty.proxy.remote.port";

    /**
     * The local address attribute name.
     */
    public static final String LOCAL_ADDRESS_ATTRIBUTE_NAME = "org.eclipse.jetty.proxy.local.address";

    /**
     * The local port attribute name.
     */
    public static final String LOCAL_PORT_ATTRIBUTE_NAME = "org.eclipse.jetty.proxy.local.port";

    @Override
    public Request customize(Request request, HttpFields.Mutable responseHeaders)
    {
        EndPoint endPoint = request.getConnectionMetaData().getConnection().getEndPoint();
        if (endPoint instanceof ProxyConnectionFactory.ProxyEndPoint)
        {
            EndPoint underlyingEndpoint = ((ProxyConnectionFactory.ProxyEndPoint)endPoint).unwrap();
            request = new ProxyRequest(request, underlyingEndpoint.getLocalSocketAddress(), underlyingEndpoint.getRemoteSocketAddress());
        }
        return request;
    }

    private static class ProxyRequest extends Request.Wrapper
    {
        private final String _remoteAddress;
        private final String _localAddress;
        private final int _remotePort;
        private final int _localPort;

        private ProxyRequest(Request request, SocketAddress local, SocketAddress remote)
        {
            super(request);
            InetSocketAddress inetLocal = local instanceof InetSocketAddress ? (InetSocketAddress)local : null;
            InetSocketAddress inetRemote = remote instanceof InetSocketAddress ? (InetSocketAddress)remote : null;
            _localAddress = inetLocal == null ? null : inetLocal.getAddress().getHostAddress();
            _remoteAddress = inetRemote == null ? null : inetRemote.getAddress().getHostAddress();
            _localPort = inetLocal == null ? 0 : inetLocal.getPort();
            _remotePort = inetRemote == null ? 0 : inetRemote.getPort();
        }

        @Override
        public Object getAttribute(String name)
        {
            return switch (name)
            {
                case REMOTE_ADDRESS_ATTRIBUTE_NAME -> _remoteAddress;
                case REMOTE_PORT_ATTRIBUTE_NAME -> _remotePort;
                case LOCAL_ADDRESS_ATTRIBUTE_NAME -> _localAddress;
                case LOCAL_PORT_ATTRIBUTE_NAME -> _localPort;
                default -> super.getAttribute(name);
            };
        }

        @Override
        public Set getAttributeNameSet()
        {
            Set names = new HashSet<>(super.getAttributeNameSet());
            names.remove(REMOTE_ADDRESS_ATTRIBUTE_NAME);
            names.remove(LOCAL_ADDRESS_ATTRIBUTE_NAME);

            if (_remoteAddress != null)
                names.add(REMOTE_ADDRESS_ATTRIBUTE_NAME);
            if (_localAddress != null)
                names.add(LOCAL_ADDRESS_ATTRIBUTE_NAME);
            names.add(REMOTE_PORT_ATTRIBUTE_NAME);
            names.add(LOCAL_PORT_ATTRIBUTE_NAME);
            return names;
        }
    }
}