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The XAdES4j library is an high-level, configurable and extensible Java implementation of XML Advanced Electronic Signatures (XAdES 1.3.2 and 1.4.1). It enables producing, verifying and extending signatures in the main XAdES forms: XAdES-BES, XAdES-EPES, XAdES-T and XAdES-C. Also, extended forms are supported through the enrichment of an existing signature.
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/*
 * XAdES4j - A Java library for generation and verification of XAdES signatures.
 * Copyright (C) 2010 Luis Goncalves.
 *
 * XAdES4j is free software; you can redistribute it and/or modify it under
 * the terms of the GNU Lesser General Public License as published by the Free
 * Software Foundation; either version 3 of the License, or any later version.
 *
 * XAdES4j is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
 * details.
 *
 * You should have received a copy of the GNU Lesser General Public License along
 * with XAdES4j. If not, see .
 */
package xades4j.production;

import xades4j.algorithms.Algorithm;
import com.google.inject.Inject;
import java.util.HashMap;
import java.util.Map;
import org.apache.xml.security.utils.Constants;
import org.w3c.dom.Element;
import xades4j.properties.CompleteCertificateRefsProperty;
import xades4j.properties.CompleteRevocationRefsProperty;
import xades4j.properties.QualifyingProperty;
import xades4j.properties.SigAndRefsTimeStampProperty;
import xades4j.properties.SignatureTimeStampProperty;
import xades4j.properties.data.BaseXAdESTimeStampData;
import xades4j.properties.data.SigAndRefsTimeStampData;
import xades4j.providers.AlgorithmsProviderEx;
import xades4j.providers.TimeStampTokenProvider;
import xades4j.providers.TimeStampTokenProvider.TimeStampTokenRes;
import xades4j.utils.CannotAddDataToDigestInputException;
import xades4j.utils.DOMHelper;
import xades4j.utils.TimeStampDigestInput;
import xades4j.utils.TimeStampDigestInputFactory;

/**
 * Assumes that all the needed input elements are already in the signature.
 * @author Luís
 */
class DataGenSigAndRefsTimeStamp extends DataGenBaseTimeStamp
{
    @Inject
    public DataGenSigAndRefsTimeStamp(
            AlgorithmsProviderEx algorithmsProvider,
            TimeStampTokenProvider timeStampTokenProvider,
            TimeStampDigestInputFactory timeStampDigestInputFactory)
    {
        super(algorithmsProvider, timeStampTokenProvider, timeStampDigestInputFactory);
    }

    @Override
    protected void addPropSpecificTimeStampInput(
            SigAndRefsTimeStampProperty prop,
            TimeStampDigestInput digestInput,
            PropertiesDataGenerationContext ctx) throws CannotAddDataToDigestInputException, PropertyDataGenerationException
    {
        Element unsignedSigPropsElem = DOMHelper.getFirstDescendant(
            ctx.getTargetXmlSignature().getElement(),
            QualifyingProperty.XADES_XMLNS, QualifyingProperty.UNSIGNED_SIGNATURE_PROPS_TAG);
        if (null == unsignedSigPropsElem)
            throw new PropertyDataGenerationException(prop, "no unsigned signature properties to get inputs");

        /**
         * This property contains a time-stamp token that covers the following data
         * objects: {@code ds:SignatureValue} element, all present {@code SignatureTimeStamp}
         * elements, {@code CompleteCertificateRefs}, {@code CompleteRevocationRefs}, and
         * when present, {@code AttributeCertificateRefs} and {@code AttributeRevocationRefs}.
         *
         * "Those (...) that appear before SigAndRefsTimeStamp, in their order of
         * appearance within the UnsignedSignatureProperties element."
         */
        Map elegiblePropsCnt = new HashMap(5);
        elegiblePropsCnt.put(CompleteCertificateRefsProperty.PROP_NAME, 0);
        elegiblePropsCnt.put(CompleteRevocationRefsProperty.PROP_NAME, 0);
        elegiblePropsCnt.put(SignatureTimeStampProperty.PROP_NAME, 0);
        elegiblePropsCnt.put("AttributeCertificateRefs", 0);
        elegiblePropsCnt.put("AttributeRevocationRefs", 0);

        try
        {
            // SignatureValue.
            Element e = DOMHelper.getFirstDescendant(
                    ctx.getTargetXmlSignature().getElement(),
                    Constants.SignatureSpecNS, Constants._TAG_SIGNATUREVALUE);
            digestInput.addNode(e);

            e = DOMHelper.getFirstChildElement(unsignedSigPropsElem);
            // UnsignedProperties shouldn't be empty!
            do
            {
                Integer pCnt = elegiblePropsCnt.get(e.getLocalName());
                if (pCnt != null)
                {
                    elegiblePropsCnt.put(e.getLocalName(), pCnt += 1);
                    digestInput.addNode(e);
                }

            } while ((e = DOMHelper.getNextSiblingElement(e)) != null);

            // SignatureTimeStamp has to be present.
            if (elegiblePropsCnt.get(SignatureTimeStampProperty.PROP_NAME) == 0)
                throw new PropertyDataGenerationException(prop, "no signature time-stamps for input");

            // CompleteCertificateRefs has to be present.
            if (elegiblePropsCnt.get(CompleteCertificateRefsProperty.PROP_NAME) != 1)
                throw new PropertyDataGenerationException(prop, "no CompleteCertificateRefs for input");

            // CompleteRevocationRefs has to be present.
            if (elegiblePropsCnt.get(CompleteRevocationRefsProperty.PROP_NAME) != 1)
                throw new PropertyDataGenerationException(prop, "no CompleteRevocationRefs for input");

        } catch (CannotAddDataToDigestInputException ex)
        {
            throw new PropertyDataGenerationException(prop, "cannot create timestamp input", ex);
        }
    }

    @Override
    protected BaseXAdESTimeStampData createPropDataObj(
            SigAndRefsTimeStampProperty prop,
            Algorithm c14n,
            TimeStampTokenRes tsTknRes,
            PropertiesDataGenerationContext ctx)
    {
        prop.setTime(tsTknRes.timeStampTime);
        return new SigAndRefsTimeStampData(c14n, tsTknRes.encodedTimeStampToken);
    }
}