/*
 * The Apache Software License, Version 1.1
 *
 *
 * Copyright (c) 2001 The Apache Software Foundation.  All rights
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
 *
 * 4. The names "Axis" and "Apache Software Foundation" must
 *    not be used to endorse or promote products derived from this
 *    software without prior written permission. For written
 *    permission, please contact apache@apache.org.
 *
 * 5. Products derived from this software may not be called "Apache",
 *    nor may "Apache" appear in their name, without prior written
 *    permission of the Apache Software Foundation.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 */

package samples.security;

import org.apache.axis.AxisFault;
import org.apache.axis.Handler;
import org.apache.axis.Message;
import org.apache.axis.MessageContext;
import org.apache.axis.handlers.BasicHandler;
import org.apache.axis.components.logger.LogFactory;
import org.apache.commons.logging.Log;
import org.apache.axis.utils.Messages;

import org.apache.xml.security.signature.XMLSignature;
import org.apache.xml.security.utils.Constants;
import org.apache.xpath.CachedXPathAPI;
import org.w3c.dom.Document;
import org.w3c.dom.Element;

import java.io.FileWriter;
import java.io.PrintWriter;

public class LogHandler extends BasicHandler {
    static Log log =
        LogFactory.getLog(LogHandler.class.getName());

    static {
        org.apache.xml.security.Init.init();
    }

    public void invoke(MessageContext msgContext) throws AxisFault {
        try {
            System.out.println("Starting Server verification");

            Message inMsg = msgContext.getRequestMessage();
            Message outMsg = msgContext.getResponseMessage();

            // verify signed message

            Document doc = inMsg.getSOAPEnvelope().getAsDocument();
            String BaseURI = "http://xml-security";
            CachedXPathAPI xpathAPI = new CachedXPathAPI();

            Element nsctx = doc.createElement("nsctx");
            nsctx.setAttribute("xmlns:ds", Constants.SignatureSpecNS);

            Element signatureElem = (Element) xpathAPI.selectSingleNode(doc,
                    "//ds:Signature", nsctx);

            // check to make sure that the document claims to have been signed
            if (signatureElem == null) {
                System.out.println("The document is not signed");
                return;
            }

            XMLSignature sig = new XMLSignature(signatureElem, BaseURI);

            boolean verify = sig.checkSignatureValue(sig.getKeyInfo().getPublicKey());
            System.out.println("Server verification complete.");

            System.out.println("The signature is" + (verify
                    ? " "
                    : " not ") + "valid");
        } catch (Exception e) {
            throw AxisFault.makeFault(e);
        }

    }

    public void undo(MessageContext msgContext) {
        try {
            Handler serviceHandler = msgContext.getService();
            String filename = (String) getOption("filename");
            if ((filename == null) || (filename.equals("")))
                throw new AxisFault("Server.NoLogFile",
                        "No log file configured for the LogHandler!",
                        null, null);
            FileWriter fw = new FileWriter(filename, true);
            PrintWriter pw = new PrintWriter(fw);
            pw.println("=====================");
            pw.println("= " + Messages.getMessage("fault00"));
            pw.println("=====================");
            pw.close();
        } catch (Exception e) {
            log.error(e);
        }
    }
}
