XMLSecAttachmentTextXMLContentTransform.java

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 * Copyright (c) 2005-2025 Link.it srl (https://link.it).
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 * This program is free software: you can redistribute it and/or modify
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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package org.openspcoop2.security.message.soapbox.signature;

import java.io.ByteArrayOutputStream;
import java.io.OutputStream;

import org.apache.xml.security.c14n.CanonicalizationException;
import org.apache.xml.security.c14n.implementations.Canonicalizer20010315ExclOmitComments;
import org.apache.xml.security.signature.XMLSignatureInput;
import org.apache.xml.security.transforms.implementations.TransformC14NExclusive;
import org.apache.xml.security.transforms.params.InclusiveNamespaces;
import org.apache.xml.security.utils.XMLUtils;
import org.w3c.dom.Element;
import org.w3c.dom.Node;

/**
 * XMLSecAttachmentTextXMLContentTransform
 *
 * @author Andrea Poli (apoli@link.it)
 * @author Tommaso Burlon (tommaso.burlon@link.it)
 * @author $Author$
 * @version $Rev$, $Date$
 */
public class XMLSecAttachmentTextXMLContentTransform extends TransformC14NExclusive {

    @Override
    protected XMLSignatureInput enginePerformTransform(XMLSignatureInput xmlsignatureinput,
            OutputStream outputstream, Element transformElement, String baseURI, boolean secureValidation) throws CanonicalizationException {
        
        try{        
            XMLSignatureInput xmlsignatureinput1 = null;
            String s = null;
            if(length("http://www.w3.org/2001/10/xml-exc-c14n#", "InclusiveNamespaces", transformElement) == 1)
            {
                Element element = XMLUtils.selectNode(transformElement.getFirstChild(), 
                        "http://www.w3.org/2001/10/xml-exc-c14n#", "InclusiveNamespaces", 0);
                s = (new InclusiveNamespaces(element, baseURI)).getInclusiveNamespaces();
            }
            Canonicalizer20010315ExclOmitComments canonicalizer20010315exclomitcomments = 
                    new Canonicalizer20010315ExclOmitComments();
            xmlsignatureinput.setNeedsToBeExpanded(true);
            ByteArrayOutputStream bout = new ByteArrayOutputStream();
            canonicalizer20010315exclomitcomments.engineCanonicalize(xmlsignatureinput, s, bout, secureValidation);
            bout.flush();
            bout.close();
            byte[] abyte0 = bout.toByteArray();
            xmlsignatureinput1 = new XMLSignatureInput(abyte0);
            if(outputstream != null) {
                outputstream.write(abyte0);
                xmlsignatureinput1.setOutputStream(outputstream);
            }
            return xmlsignatureinput1;
        }catch(Exception e){
            throw new CanonicalizationException(e);
        }
    }
    
    private int length(String namespace, String localname, Element transformElement) {
        int number = 0;
        Node sibling = transformElement.getFirstChild();
        while (sibling != null) {        
            if (localname.equals(sibling.getLocalName())
                && namespace.equals(sibling.getNamespaceURI())) {
                number++;
            }
            sibling = sibling.getNextSibling();
        }
        return number;
    }
}