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/**

* Copyright (C) 2020 EDIT

* European Distributed Institute of Taxonomy

* http://www.e-taxonomy.eu

*

* The contents of this file are subject to the Mozilla Public License Version 1.1

* See LICENSE.TXT at the top of this package for the full license terms.

*/

package eu.etaxonomy.cdm.remote;

import java.io.IOException;

import java.time.OffsetDateTime;

import java.time.format.DateTimeFormatter;

import javax.servlet.Filter;

import javax.servlet.FilterChain;

import javax.servlet.FilterConfig;

import javax.servlet.ServletException;

import javax.servlet.ServletRequest;

import javax.servlet.ServletResponse;

import javax.servlet.http.HttpServletResponse;

/**

 * Adds a "Date" Header to the http response formatted as RFC_1123_DATE_TIME.

 *

 * https://tools.ietf.org/html/rfc2616#section-14.18

 *

 * @author a.kohlbecker

 * @since Jan 17, 2020

 *

 */

public class DateHeaderFilter implements Filter {

    /**

     * {@inheritDoc}

     */

    @Override

    public void init(FilterConfig filterConfig) throws ServletException {

        // Nothing to do

    }

    /**

     * {@inheritDoc}

     */

    @Override

    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)

            throws IOException, ServletException {

        OffsetDateTime dateTime = OffsetDateTime.now();

        HttpServletResponse httpServletResponse = (HttpServletResponse) response;

        httpServletResponse.setHeader("Date", dateTime.format(DateTimeFormatter.RFC_1123_DATE_TIME));

        chain.doFilter(request, response);

    }

    /**

     * {@inheritDoc}

     */

    @Override

    public void destroy() {

        // Nothing to do

    }

}

  <filter>

       <filter-name>dateHeaderFilter</filter-name>

       <filter-class>eu.etaxonomy.cdm.remote.DateHeaderFilter</filter-class>

  </filter>

    <filter-mapping>

    <filter-name>dateHeaderFilter</filter-name>

    <url-pattern>/*</url-pattern>

  </filter-mapping>