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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.diagnostic;
import eu.europa.esig.dss.diagnostic.jaxb.XmlByteRange;
import eu.europa.esig.dss.diagnostic.jaxb.XmlDocMDP;
import eu.europa.esig.dss.diagnostic.jaxb.XmlModification;
import eu.europa.esig.dss.diagnostic.jaxb.XmlModificationDetection;
import eu.europa.esig.dss.diagnostic.jaxb.XmlObjectModification;
import eu.europa.esig.dss.diagnostic.jaxb.XmlObjectModifications;
import eu.europa.esig.dss.diagnostic.jaxb.XmlPDFLockDictionary;
import eu.europa.esig.dss.diagnostic.jaxb.XmlPDFRevision;
import eu.europa.esig.dss.diagnostic.jaxb.XmlPDFSignatureField;
import eu.europa.esig.dss.enumerations.CertificationPermission;
import java.math.BigInteger;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Objects;
/**
* Contains user-friendly methods to extract information from an {@code eu.europa.esig.dss.diagnostic.jaxb.XmlPDFRevision}
*
*/
public class PDFRevisionWrapper {
/** Wrapped {@code XmlPDFRevision} */
private final XmlPDFRevision pdfRevision;
/**
* Default constructor
*
* @param pdfRevision {@link XmlPDFRevision}
*/
public PDFRevisionWrapper(XmlPDFRevision pdfRevision) {
Objects.requireNonNull(pdfRevision, "XmlPDFRevision cannot be null!");
this.pdfRevision = pdfRevision;
}
/**
* Checks if any visual modifications detected in the PDF
*
* @return TRUE if modifications detected in a PDF, FALSE otherwise
*/
public boolean arePdfModificationsDetected() {
XmlModificationDetection modificationDetection = pdfRevision.getModificationDetection();
if (modificationDetection != null) {
return !modificationDetection.getAnnotationOverlap().isEmpty() ||
!modificationDetection.getVisualDifference().isEmpty() ||
!modificationDetection.getPageDifference().isEmpty();
}
return false;
}
/**
* Returns a list of PDF annotation overlap concerned pages
*
* @return a list of page numbers
*/
public List getPdfAnnotationsOverlapConcernedPages() {
XmlModificationDetection modificationDetection = pdfRevision.getModificationDetection();
if (modificationDetection != null) {
List annotationOverlap = modificationDetection.getAnnotationOverlap();
return getConcernedPages(annotationOverlap);
}
return Collections.emptyList();
}
/**
* Returns a list of PDF visual difference concerned pages
*
* @return a list of page numbers
*/
public List getPdfVisualDifferenceConcernedPages() {
XmlModificationDetection modificationDetection = pdfRevision.getModificationDetection();
if (modificationDetection != null) {
List visualDifference = modificationDetection.getVisualDifference();
return getConcernedPages(visualDifference);
}
return Collections.emptyList();
}
/**
* Returns a list of pages missing/added to the final revision in a comparison with a signed one
*
* @return a list of page numbers
*/
public List getPdfPageDifferenceConcernedPages() {
XmlModificationDetection modificationDetection = pdfRevision.getModificationDetection();
if (modificationDetection != null) {
List pageDifference = modificationDetection.getPageDifference();
return getConcernedPages(pageDifference);
}
return Collections.emptyList();
}
/**
* This method checks whether object modifications are present after the current PDF revisions
*
* @return TRUE if PDF has been modified, FALSE otherwise
*/
public boolean arePdfObjectModificationsDetected() {
return getPdfObjectModifications() != null;
}
/**
* Returns a list of changes occurred in a PDF after the current signature's revision associated
* with a signature/document extension
*
* @return a list of {@link XmlObjectModification}s
*/
public List getPdfExtensionChanges() {
XmlObjectModifications pdfObjectModifications = getPdfObjectModifications();
if (pdfObjectModifications != null) {
return pdfObjectModifications.getExtensionChanges();
}
return Collections.emptyList();
}
/**
* Returns a list of changes occurred in a PDF after the current signature's revision associated
* with a signature creation, form filling
*
* @return a list of {@link XmlObjectModification}s
*/
public List getPdfSignatureOrFormFillChanges() {
XmlObjectModifications pdfObjectModifications = getPdfObjectModifications();
if (pdfObjectModifications != null) {
return pdfObjectModifications.getSignatureOrFormFill();
}
return Collections.emptyList();
}
/**
* Returns a list of changes occurred in a PDF after the current signature's revision associated
* with annotation(s) modification
*
* @return a list of {@link XmlObjectModification}s
*/
public List getPdfAnnotationChanges() {
XmlObjectModifications pdfObjectModifications = getPdfObjectModifications();
if (pdfObjectModifications != null) {
return pdfObjectModifications.getAnnotationChanges();
}
return Collections.emptyList();
}
/**
* Returns a list of undefined changes occurred in a PDF after the current signature's revision
*
* @return a list of {@link XmlObjectModification}s
*/
public List getPdfUndefinedChanges() {
XmlObjectModifications pdfObjectModifications = getPdfObjectModifications();
if (pdfObjectModifications != null) {
return pdfObjectModifications.getUndefined();
}
return Collections.emptyList();
}
/**
* This method returns a list of field names modified after the current signature's revision
*
* @return a list of {@link String}s
*/
public List getModifiedFieldNames() {
List names = new ArrayList<>();
XmlObjectModifications pdfObjectModifications = getPdfObjectModifications();
if (pdfObjectModifications != null) {
names.addAll(getModifiedFieldNames(pdfObjectModifications.getExtensionChanges()));
names.addAll(getModifiedFieldNames(pdfObjectModifications.getSignatureOrFormFill()));
names.addAll(getModifiedFieldNames(pdfObjectModifications.getAnnotationChanges()));
names.addAll(getModifiedFieldNames(pdfObjectModifications.getUndefined()));
}
return names;
}
/**
* Returns the first signature field name
*
* @return {@link String} field name
*/
public String getFirstFieldName() {
List fields = pdfRevision.getFields();
if (fields != null && !fields.isEmpty()) {
return fields.iterator().next().getName();
}
return null;
}
/**
* Returns a list of signature field names, where the signature is referenced from
*
* @return a list of {@link String} signature field names
*/
public List getSignatureFieldNames() {
List names = new ArrayList<>();
List fields = pdfRevision.getFields();
if (fields != null && !fields.isEmpty()) {
for (XmlPDFSignatureField signatureField : fields) {
names.add(signatureField.getName());
}
}
return names;
}
/**
* Returns the signer's name
*
* @return {@link String}
*/
public String getSignerName() {
return pdfRevision.getPDFSignatureDictionary().getSignerName();
}
/**
* Returns the PDF signature dictionary /Type value
*
* @return {@link String}
*/
public String getSignatureDictionaryType() {
return pdfRevision.getPDFSignatureDictionary().getType();
}
/**
* Returns the PDF signature dictionary /Filter value
*
* @return {@link String}
*/
public String getFilter() {
return pdfRevision.getPDFSignatureDictionary().getFilter();
}
/**
* Returns the PDF signature dictionary /SubFilter value
*
* @return {@link String}
*/
public String getSubFilter() {
return pdfRevision.getPDFSignatureDictionary().getSubFilter();
}
/**
* Returns the PDF signature dictionary /ContactInfo value
*
* @return {@link String}
*/
public String getContactInfo() {
return pdfRevision.getPDFSignatureDictionary().getContactInfo();
}
/**
* Returns the PDF signature dictionary /Location value
*
* @return {@link String}
*/
public String getLocation() {
return pdfRevision.getPDFSignatureDictionary().getLocation();
}
/**
* Returns the PDF signature dictionary /Reason value
*
* @return {@link String}
*/
public String getReason() {
return pdfRevision.getPDFSignatureDictionary().getReason();
}
/**
* Returns the PDF signature dictionary /ByteRange value
*
* @return byte range
*/
public List getSignatureByteRange() {
XmlByteRange byteRange = getXmlByteRange();
if (byteRange != null) {
return byteRange.getValue();
}
return Collections.emptyList();
}
/**
* This method returns whether the PDF signature dictionary /ByteRange is found and valid
*
* @return TRUE if the /ByteRange is valid, FALSE otherwise
*/
public boolean isSignatureByteRangeValid() {
XmlByteRange byteRange = getXmlByteRange();
if (byteRange != null) {
return byteRange.isValid();
}
return false;
}
private XmlByteRange getXmlByteRange() {
return pdfRevision.getPDFSignatureDictionary().getSignatureByteRange();
}
/**
* This method returns whether the PDF signature dictionary is consistent across PDF revisions.
*
* @return TRUE if the signature dictionary is consistent, FALSE otherwise
*/
public boolean isPdfSignatureDictionaryConsistent() {
return pdfRevision.getPDFSignatureDictionary().isConsistent();
}
/**
* Returns a {@code CertificationPermission} value of a /DocMDP dictionary, when present
*
* @return {@link CertificationPermission}
*/
public CertificationPermission getDocMDPPermissions() {
XmlDocMDP docMDP = pdfRevision.getPDFSignatureDictionary().getDocMDP();
if (docMDP != null) {
return docMDP.getPermissions();
}
return null;
}
/**
* Returns a /FieldMDP dictionary content, when present
*
* @return {@link XmlPDFLockDictionary}
*/
public XmlPDFLockDictionary getFieldMDP() {
return pdfRevision.getPDFSignatureDictionary().getFieldMDP();
}
/**
* Returns a /SigFieldLock dictionary, when present
*
* @return {@link XmlPDFLockDictionary}
*/
public XmlPDFLockDictionary getSigFieldLock() {
List fields = pdfRevision.getFields();
for (XmlPDFSignatureField field : fields) {
XmlPDFLockDictionary sigFieldLock = field.getSigFieldLock();
if (sigFieldLock != null) {
return sigFieldLock;
}
}
return null;
}
private List getConcernedPages(List xmlModifications) {
List pages = new ArrayList<>();
for (XmlModification modification : xmlModifications) {
pages.add(modification.getPage());
}
return pages;
}
private XmlObjectModifications getPdfObjectModifications() {
XmlModificationDetection modificationDetection = pdfRevision.getModificationDetection();
if (modificationDetection != null) {
return modificationDetection.getObjectModifications();
}
return null;
}
private List getModifiedFieldNames(List objectModifications) {
List names = new ArrayList<>();
for (XmlObjectModification objectModification : objectModifications) {
String fieldName = objectModification.getFieldName();
if (fieldName != null) {
names.add(fieldName);
}
}
return names;
}
}