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WAFFLE JNA implementation
There is a newer version: 1.8.1
/**
 * Waffle (https://github.com/dblock/waffle)
 *
 * Copyright (c) 2010 - 2014 Application Security, Inc.
 *
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     Application Security, Inc.
 */
package waffle.servlet;

import java.io.IOException;
import java.security.Principal;
import java.util.Enumeration;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerConfigurationException;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;

import org.w3c.dom.Document;
import org.w3c.dom.Element;

import waffle.util.WaffleInfo;

/**
 * A servlet that returns WaffleInfo as XML
 */
public class WaffleInfoServlet extends HttpServlet {

    private static final long serialVersionUID = 1L;

    @Override
    public void doGet(final HttpServletRequest request, final HttpServletResponse response) throws ServletException,
            IOException {
        final WaffleInfo info = new WaffleInfo();
        try {
            final Document doc = info.getWaffleInfo();
            final Element root = doc.getDocumentElement();

            // Add the Request Information Here
            final Element http = getRequestInfo(doc, request);
            root.insertBefore(http, root.getFirstChild());

            // Lookup Accounts By Name
            final String[] lookup = request.getParameterValues("lookup");
            if (lookup != null) {
                for (String name : lookup) {
                    root.appendChild(info.getLookupInfo(doc, name));
                }
            }

            // Write the XML Response
            final TransformerFactory transfac = TransformerFactory.newInstance();
            final Transformer trans = transfac.newTransformer();
            trans.setOutputProperty(OutputKeys.INDENT, "yes");

            final StreamResult result = new StreamResult(response.getWriter());
            final DOMSource source = new DOMSource(doc);
            trans.transform(source, result);
            response.setContentType("application/xml");
        } catch (ParserConfigurationException e) {
            throw new ServletException(e);
        } catch (TransformerConfigurationException e) {
            throw new ServletException(e);
        } catch (TransformerException e) {
            throw new ServletException(e);
        }
    }

    /**
     * Delegate POST to GET.
     * 
     * @param request
     *            httpServletRequest.
     * @param response
     *            httpServletResponse.
     * @throws ServletException
     *             or IOException.
     * */
    @Override
    public void doPost(final HttpServletRequest request, final HttpServletResponse response) throws ServletException,
            IOException {
        doGet(request, response);
    }

    public Element getRequestInfo(final Document doc, final HttpServletRequest request) {
        final Element node = doc.createElement("request");

        Element value = doc.createElement("AuthType");
        value.setTextContent(request.getAuthType());
        node.appendChild(value);

        final Principal p = request.getUserPrincipal();
        if (p != null) {
            Element child = doc.createElement("principal");
            child.setAttribute("class", p.getClass().getName());

            value = doc.createElement("name");
            value.setTextContent(p.getName());
            child.appendChild(value);

            value = doc.createElement("string");
            value.setTextContent(p.toString());
            child.appendChild(value);

            node.appendChild(child);
        }

        final Enumeration headers = request.getHeaderNames();
        if (headers.hasMoreElements()) {
            String name;
            Element child = doc.createElement("headers");
            while (headers.hasMoreElements()) {
                name = (String) headers.nextElement();

                value = doc.createElement(name);
                value.setTextContent(request.getHeader(name));
                child.appendChild(value);
            }
            node.appendChild(child);
        }
        return node;
    }
}