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Milton Community Edition: Supports DAV level 1 and is available on Apache2 license
There is a newer version: 4.0.3.2215
/*
 * 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 io.milton.ftp;

import java.net.SocketAddress;
import org.apache.ftpserver.ftplet.FtpReply;
import org.apache.ftpserver.ftplet.FtpRequest;
import org.apache.ftpserver.impl.FtpHandler;
import org.apache.ftpserver.impl.FtpIoSession;
import org.apache.ftpserver.impl.FtpServerContext;
import org.apache.ftpserver.listener.Listener;
import org.apache.mina.core.session.IdleStatus;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Wraps DefaultFtpHandler, adding support for filters
 *
 * @author brad
 */
public class MiltonFtpHandler implements FtpHandler {

	private static final Logger log = LoggerFactory.getLogger(MiltonFtpFile.class);
	private final FtpHandler wrapped;
	private final FtpActionListener actionListener;

	public MiltonFtpHandler(FtpHandler wrapped, FtpActionListener actionListener) {
		this.wrapped = wrapped;
		this.actionListener = actionListener;
	}

	@Override
	public void init(FtpServerContext arg0, Listener arg1) {
		wrapped.init(arg0, arg1);
	}

	@Override
	public void sessionCreated(FtpIoSession arg0) throws Exception {
		wrapped.sessionCreated(arg0);
	}

	@Override
	public void sessionOpened(FtpIoSession arg0) throws Exception {
		wrapped.sessionOpened(arg0);
	}

	@Override
	public void sessionClosed(FtpIoSession arg0) throws Exception {
		wrapped.sessionClosed(arg0);
	}

	@Override
	public void sessionIdle(FtpIoSession arg0, IdleStatus arg1) throws Exception {
		wrapped.sessionIdle(arg0, arg1);
	}

	@Override
	public void exceptionCaught(FtpIoSession arg0, Throwable arg1) throws Exception {
		wrapped.exceptionCaught(arg0, arg1);
	}

	@Override
	public void messageReceived(final FtpIoSession session, final FtpRequest request) throws Exception {
		SocketAddress sa = session.getServiceAddress();
		log.debug("message received: " + sa.toString());
		if (actionListener != null) {
			actionListener.onAction(session, request, () -> {
				try {
					wrapped.messageReceived(session, request);
				} catch (Throwable ex) {
					log.error("Exception", ex);
				}
			});
		} else {
			wrapped.messageReceived(session, request);
		}
	}

	@Override
	public void messageSent(FtpIoSession ioSession, FtpReply ftpReply) throws Exception {
		wrapped.messageSent(ioSession, ftpReply);
	}
}