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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.servlet;

import io.milton.http.AbstractResponse;
import io.milton.http.BeanCookie;
import io.milton.http.Cookie;
import io.milton.http.Response;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Collections;
import java.util.Date;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import jakarta.servlet.http.HttpServletResponse;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class ServletResponse extends AbstractResponse {

	private static final Logger log = LoggerFactory.getLogger(ServletResponse.class);
	private static final ThreadLocal tlResponse = new ThreadLocal<>();

	/**
	 * We make this available via a threadlocal so it can be accessed from parts
	 * of the application which don't have a reference to the servletresponse
	 * @return
	 */
	public static HttpServletResponse getResponse() {
		return tlResponse.get();
	}
	private final HttpServletResponse r;
//    private ByteArrayOutputStream out = new ByteArrayOutputStream();
	private Response.Status status;
	private final Map headers = new HashMap<>();

	public ServletResponse(HttpServletResponse r) {
		this.r = r;
		tlResponse.set(r);
	}

	/**
	 * Override to use servlets own date setting
	 *
	 * @param name
	 * @param date
	 */
	@Override
	protected void setAnyDateHeader(Header name, Date date) {
		if (date != null) {
			r.setDateHeader(name.code, date.getTime());
		} else {
			r.setHeader(name.code, null);
		}
	}

	@Override
	public String getNonStandardHeader(String code) {
		return headers.get(code);
	}

	@Override
	public void setNonStandardHeader(String name, String value) {
		r.addHeader(name, value);
		headers.put(name, value);
	}

	@Override
	public void setStatus(Response.Status status) {
		r.setStatus(status.code);
		this.status = status;
	}

	@Override
	public Response.Status getStatus() {
		return status;
	}

	@Override
	public OutputStream getOutputStream() {
		try {
//        return out;
			return r.getOutputStream();
		} catch (IOException ex) {
			throw new RuntimeException(ex);
		}
	}

	@Override
	public void close() {
		try {
			r.flushBuffer();
		} catch (Throwable ex) {
			log.trace("exception closing and flushing", ex);
		}
	}

	@Override
	public void sendError(Status status, String message) {
		log.warn("sendError: " + status);
		try {
			r.sendError(status.code, message);
		} catch (IOException ex) {
			log.error("Failed to send error", ex);
		}
		try {
			r.getOutputStream().close();
			log.info("Closed outputstream after sendError");
		} catch (IOException e) {
			log.warn("Failed to close outputstream after sendError");
		}
	}

	@Override
	public void sendRedirect(String url) {
		String u = r.encodeRedirectURL(url);
		try {
			r.sendRedirect(u);
		} catch (IOException ex) {
			log.warn("exception sending redirect", ex);
		}
	}

	@Override
	public Map getHeaders() {
		return Collections.unmodifiableMap(headers);
	}

	@Override
	public void setAuthenticateHeader(List challenges) {
		for (String ch : challenges) {
			r.addHeader(Response.Header.WWW_AUTHENTICATE.code, ch);
		}
	}

	@Override
	public Cookie setCookie(Cookie cookie) {
		String h = BeanCookie.toHeader(cookie);
		r.addHeader("Set-Cookie", h);
		return cookie;
	}

	@Override
	public Cookie setCookie(String name, String value) {
		BeanCookie c = new BeanCookie(name);
		c.setValue(value);
		c.setPath("/");
		setCookie(c);
		return c;
	}
}