eu.europa.esig.dss.pdf.pdfbox.PdfBoxCMSInfo.java Source code

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Here is the source code for eu.europa.esig.dss.pdf.pdfbox.PdfBoxCMSInfo.java

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/**
 * DSS - Digital Signature Services
 * Copyright (C) 2015 European Commission, provided under the CEF programme
 *
 * This file is part of the "DSS - Digital Signature Services" project.
 *
 * This library 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 2.1 of the License, or (at your option) any later version.
 *
 * This library 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 this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 */
package eu.europa.esig.dss.pdf.pdfbox;

import java.util.Arrays;
import java.util.Collections;
import java.util.Date;
import java.util.HashSet;
import java.util.Set;

import org.apache.commons.codec.binary.Hex;
import org.apache.pdfbox.pdmodel.interactive.digitalsignature.PDSignature;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import eu.europa.esig.dss.DSSUtils;
import eu.europa.esig.dss.DigestAlgorithm;
import eu.europa.esig.dss.pdf.PdfDssDict;
import eu.europa.esig.dss.pdf.PdfSignatureOrDocTimestampInfo;
import eu.europa.esig.dss.validation.SignatureCryptographicVerification;

abstract class PdfBoxCMSInfo implements PdfSignatureOrDocTimestampInfo {

    private static final Logger LOG = LoggerFactory.getLogger(PdfBoxCMSInfo.class);
    private final PdfDssDict dssDictionary;
    private final Date signingDate;
    private final String location;
    private final String contactInfo;
    private final String reason;
    private final String subFilter;
    private final int[] signatureByteRange;

    private final byte[] cms;

    /**
     * The original signed pdf document
     */
    private final byte[] signedBytes;

    private boolean verified;
    private SignatureCryptographicVerification verifyResult;
    private String uniqueId;

    private Set<PdfSignatureOrDocTimestampInfo> outerSignatures = new HashSet<PdfSignatureOrDocTimestampInfo>();

    /**
     *
     * @param signature The signature object
     * @param dssDictionary the DSS dictionary
     * @param cms the signature binary
     * @param signedContent the signed content
     */
    PdfBoxCMSInfo(PDSignature signature, PdfDssDict dssDictionary, byte[] cms, byte[] signedContent) {
        this.cms = cms;
        this.location = signature.getLocation();
        this.reason = signature.getReason();
        this.contactInfo = signature.getContactInfo();
        this.subFilter = signature.getSubFilter();
        this.signingDate = signature.getSignDate() != null ? signature.getSignDate().getTime() : null;
        this.signatureByteRange = signature.getByteRange();
        this.dssDictionary = dssDictionary;
        this.signedBytes = signedContent;
    }

    @Override
    public SignatureCryptographicVerification checkIntegrity() {
        if (!verified) {
            verifyResult = checkIntegrityOnce();
            LOG.debug("Verify embedded CAdES Signature on signedBytes size {}. Signature intact: {}",
                    signedBytes.length, verifyResult);
            verified = true;
        }
        return verifyResult;
    }

    protected abstract SignatureCryptographicVerification checkIntegrityOnce();

    /**
     * @return the byte of the originally signed document
     */
    @Override
    public byte[] getSignedDocumentBytes() {
        return signedBytes;
    }

    @Override
    public byte[] getOriginalBytes() {
        final int length = signatureByteRange[1];
        final byte[] result = new byte[length];
        System.arraycopy(signedBytes, 0, result, 0, length);
        return result;
    }

    @Override
    public PdfDssDict getDssDictionary() {
        return dssDictionary;
    }

    @Override
    public String uniqueId() {
        if (uniqueId == null) {
            byte[] digest = DSSUtils.digest(DigestAlgorithm.SHA1, cms);
            uniqueId = Hex.encodeHexString(digest);
        }
        return uniqueId;
    }

    @Override
    public void addOuterSignature(PdfSignatureOrDocTimestampInfo signatureInfo) {
        outerSignatures.add(signatureInfo);
    }

    @Override
    public Set<PdfSignatureOrDocTimestampInfo> getOuterSignatures() {
        return Collections.unmodifiableSet(outerSignatures);
    }

    @Override
    public int[] getSignatureByteRange() {
        return signatureByteRange;
    }

    @Override
    public String getLocation() {
        return location;
    }

    @Override
    public Date getSigningDate() {
        return signingDate;
    }

    @Override
    public String getContactInfo() {
        return contactInfo;
    }

    @Override
    public String getReason() {
        return reason;
    }

    @Override
    public String getSubFilter() {
        return subFilter;
    }

    @Override
    public String toString() {
        return "PdfBoxCMSInfo [subFilter=" + subFilter + ", uniqueId=" + uniqueId() + ", signatureByteRange="
                + Arrays.toString(signatureByteRange) + ", outerSignatures=" + outerSignatures + "]";
    }

}