FacturaeSignatureFactory.java

package es.uji.security.crypto.facturae;

import java.io.ByteArrayInputStream;

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

import org.w3c.dom.Document;
import org.w3c.dom.NodeList;

import es.uji.security.crypto.ISignFormatProvider;
import es.uji.security.crypto.SignatureOptions;
import es.uji.security.crypto.SignatureResult;
import es.uji.security.crypto.config.OS;
import es.uji.security.crypto.jxades.JXAdESSignatureFactory;

public class FacturaeSignatureFactory implements ISignFormatProvider
{
    public SignatureResult formatSignature(SignatureOptions signatureOptions) throws Exception
    {
        byte[] data = OS.inputStreamToByteArray(signatureOptions.getDataToSign());

        // Check if input data is already signed
        DocumentBuilderFactory documentBuilderFactory = DocumentBuilderFactory.newInstance();
        documentBuilderFactory.setNamespaceAware(true);
        DocumentBuilder documentBuilder = documentBuilderFactory.newDocumentBuilder();

        Document document = documentBuilder.parse(new ByteArrayInputStream(data));

        NodeList result = document.getElementsByTagNameNS("http://www.w3.org/2000/09/xmldsig#",
                "Signature");
        int numSignatures = result.getLength();

        if (numSignatures > 0)
        {
            SignatureResult signatureResult = new SignatureResult();
            signatureResult.setValid(false);
            signatureResult.addError("CoSign for Facturae not supported");

            return signatureResult;
        }

        // Call jXAdES format signature
        signatureOptions.setCoSignEnabled(false);
        signatureOptions
                .setPolicyIdentifier("http://www.facturae.es/politica_de_firma_formato_facturae/politica_de_firma_formato_facturae_v3_1.pdf");
        signatureOptions
                .setPolicyDescription("Pol\u00edtica de firma electr\u00f3nica para facturaci\u00f3n electr\u00f3nica con formato Facturae");
        /*signatureOptions
                .setPolicyDescription("facturae31");*/
        signatureOptions.setDataToSign(new ByteArrayInputStream(data));

        JXAdESSignatureFactory signatureFactory = new JXAdESSignatureFactory();

        return signatureFactory.formatSignature(signatureOptions);
    }
}