/**
 * 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 org.apache.xml.security.samples.canonicalization;

import java.io.ByteArrayInputStream;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;

import org.apache.xml.security.signature.XMLSignatureInput;
import org.apache.xml.security.transforms.Transforms;
import org.w3c.dom.Document;
import org.w3c.dom.Node;

/**
 * @author Christian Geuer-Pollmann
 */
public class CanonByTransform {
    static String input = ""
        + "<!DOCTYPE doc [<!ATTLIST e9 attr CDATA \"default\">]>\n"
        + "<!-- Comment 2 --><doc><!-- comment inside -->\n"
        + "   <e1   />\n"
        + "   <e2   ></e2>\n"
        + "   <e3    name = \"elem3\"   id=\"elem3\"    />\n"
        + "   <e4    name=\"elem4\"   id=\"elem4\"    ></e4>\n"
        + "   <e5 a:attr=\"out\" b:attr=\"sorted\" attr2=\"all\" attr=\"I'm\"\n"
        + "       xmlns:b=\"http://www.ietf.org\"\n"
        + "       xmlns:a=\"http://www.w3.org\"\n"
        + "       xmlns=\"http://example.org\"/>\n"
        + "   <e6 xmlns=\"\" xmlns:a=\"http://www.w3.org\">\n"
        + "       <e7 xmlns=\"http://www.ietf.org\">\n"
        + "           <e8 xmlns=\"\" xmlns:a=\"http://www.w3.org\">\n"
        + "               <e9 xmlns=\"\" xmlns:a=\"http://www.ietf.org\"/>\n"
        + "               <text>&#169;</text>\n"
        + "           </e8>\n"
        + "       </e7>\n"
        + "   </e6>\n"
        + "</doc><!-- Comment 3 -->\n"
        ;

    /**
     * Method main
     *
     * @param args
     * @throws Exception
     */
    public static void main(String args[]) throws Exception {
        org.apache.xml.security.Init.init();

        DocumentBuilderFactory dfactory = DocumentBuilderFactory.newInstance();

        dfactory.setNamespaceAware(true);
        dfactory.setValidating(true);

        DocumentBuilder documentBuilder = dfactory.newDocumentBuilder();

        // this is to throw away all validation warnings
        documentBuilder.setErrorHandler(new org.apache.xml.security.utils.IgnoreAllErrorHandler());

        byte inputBytes[] = input.getBytes();
        Document inputDoc =
            documentBuilder.parse(new ByteArrayInputStream(inputBytes));

        // after playing around, we have our document now
        XMLSignatureInput signatureInput = new XMLSignatureInput((Node) inputDoc);
        Document transformDoc = documentBuilder.newDocument();

        Transforms c14nTrans = new Transforms(transformDoc);
        transformDoc.appendChild(c14nTrans.getElement());
        c14nTrans.addTransform("http://www.w3.org/TR/2001/REC-xml-c14n-20010315#WithComments");
        XMLSignatureInput c14nResult = c14nTrans.performTransforms(signatureInput);
        byte outputBytes[] = c14nResult.getBytes();

        System.out.println(new String(outputBytes));
    }
}