/******************************************************************************* * Copyright 2014 by E-Government Innovation Center EGIZ, Graz, Austria * PDF-AS has been contracted by the E-Government Innovation Center EGIZ, a * joint initiative of the Federal Chancellery Austria and Graz University of * Technology. * * Licensed under the EUPL, Version 1.1 or - as soon they will be approved by * the European Commission - subsequent versions of the EUPL (the "Licence"); * You may not use this work except in compliance with the Licence. * You may obtain a copy of the Licence at: * http://www.osor.eu/eupl/ * * Unless required by applicable law or agreed to in writing, software * distributed under the Licence is distributed on an "AS IS" basis, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the Licence for the specific language governing permissions and * limitations under the Licence. * * This product combines work with different licenses. See the "NOTICE" text * file for details on the various modules and licenses. * The "NOTICE" text file is part of the distribution. Any derivative works * that you distribute must include a readable copy of the "NOTICE" text file. ******************************************************************************/ package at.gv.egiz.pdfas.lib.impl.signing.pdfbox2; import at.gv.egiz.pdfas.common.exceptions.PDFASError; import at.gv.egiz.pdfas.common.exceptions.PdfAsException; import at.gv.egiz.pdfas.common.messages.MessageResolver; import at.gv.egiz.pdfas.common.settings.SignatureProfileSettings; import at.gv.egiz.pdfas.lib.api.ByteArrayDataSource; import at.gv.egiz.pdfas.lib.api.IConfigurationConstants; import at.gv.egiz.pdfas.lib.api.sign.IPlainSigner; import at.gv.egiz.pdfas.lib.api.sign.SignParameter; import at.gv.egiz.pdfas.lib.impl.ErrorExtractor; import at.gv.egiz.pdfas.lib.impl.SignaturePositionImpl; import at.gv.egiz.pdfas.lib.impl.configuration.PlaceholderWebConfiguration; import at.gv.egiz.pdfas.lib.impl.configuration.SignatureProfileConfiguration; import at.gv.egiz.pdfas.lib.impl.pdfbox2.PDFBOXObject; import at.gv.egiz.pdfas.lib.impl.pdfbox2.placeholder.SignaturePlaceholderExtractor; import at.gv.egiz.pdfas.lib.impl.pdfbox2.positioning.Positioning; import at.gv.egiz.pdfas.lib.impl.pdfbox2.utils.PdfBoxUtils; import at.gv.egiz.pdfas.lib.impl.placeholder.PlaceholderFilter; import at.gv.egiz.pdfas.lib.impl.placeholder.SignaturePlaceholderData; import at.gv.egiz.pdfas.lib.impl.signing.IPdfSigner; import at.gv.egiz.pdfas.lib.impl.signing.PDFASSignatureExtractor; import at.gv.egiz.pdfas.lib.impl.signing.PDFASSignatureInterface; import at.gv.egiz.pdfas.lib.impl.stamping.IPDFStamper; import at.gv.egiz.pdfas.lib.impl.stamping.IPDFVisualObject; import at.gv.egiz.pdfas.lib.impl.stamping.TableFactory; import at.gv.egiz.pdfas.lib.impl.stamping.ValueResolver; import at.gv.egiz.pdfas.lib.impl.stamping.pdfbox2.PDFAsVisualSignatureProperties; import at.gv.egiz.pdfas.lib.impl.stamping.pdfbox2.PdfBoxVisualObject; import at.gv.egiz.pdfas.lib.impl.stamping.pdfbox2.StamperFactory; import at.gv.egiz.pdfas.lib.impl.status.OperationStatus; import at.gv.egiz.pdfas.lib.impl.status.PDFObject; import at.gv.egiz.pdfas.lib.impl.status.RequestedSignature; import at.knowcenter.wag.egov.egiz.pdf.PositioningInstruction; import at.knowcenter.wag.egov.egiz.pdf.TablePos; import at.knowcenter.wag.egov.egiz.table.Table; import iaik.x509.X509Certificate; import org.apache.commons.io.IOUtils; import org.apache.pdfbox.cos.*; import org.apache.pdfbox.pdmodel.PDDocument; import org.apache.pdfbox.pdmodel.PDDocumentCatalog; import org.apache.pdfbox.pdmodel.PDPage; import org.apache.pdfbox.pdmodel.PDResources; import org.apache.pdfbox.pdmodel.common.PDMetadata; import org.apache.pdfbox.pdmodel.common.PDNumberTreeNode; import org.apache.pdfbox.pdmodel.common.PDRectangle; import org.apache.pdfbox.pdmodel.documentinterchange.logicalstructure.PDStructureElement; import org.apache.pdfbox.pdmodel.documentinterchange.logicalstructure.PDStructureTreeRoot; import org.apache.pdfbox.pdmodel.graphics.color.PDOutputIntent; import org.apache.pdfbox.pdmodel.interactive.digitalsignature.PDSignature; import org.apache.pdfbox.pdmodel.interactive.digitalsignature.SignatureOptions; import org.apache.pdfbox.pdmodel.interactive.form.PDAcroForm; import org.apache.pdfbox.pdmodel.interactive.form.PDField; import org.apache.pdfbox.pdmodel.interactive.form.PDSignatureField; import org.apache.pdfbox.preflight.PreflightDocument; import org.apache.pdfbox.preflight.ValidationResult; import org.apache.pdfbox.preflight.exception.SyntaxValidationException; import org.apache.pdfbox.preflight.exception.ValidationException; import org.apache.pdfbox.preflight.parser.PreflightParser; import org.apache.pdfbox.rendering.ImageType; import org.apache.pdfbox.rendering.PDFRenderer; import org.apache.xmpbox.XMPMetadata; import org.apache.xmpbox.schema.PDFAIdentificationSchema; import org.apache.xmpbox.xml.DomXmpParser; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import javax.activation.DataSource; import java.awt.*; import java.awt.image.BufferedImage; import java.io.ByteArrayOutputStream; import java.io.IOException; import java.io.InputStream; import java.util.ArrayList; import java.util.Calendar; import java.util.List; public class PADESPDFBOXSigner implements IPdfSigner, IConfigurationConstants { private static final Logger logger = LoggerFactory.getLogger(PADESPDFBOXSigner.class); private boolean isAdobeSigForm = false; public void signPDF(PDFObject genericPdfObject, RequestedSignature requestedSignature, PDFASSignatureInterface genericSigner) throws PdfAsException { PDFAsVisualSignatureProperties properties = null; String placeholder_id = ""; if(PlaceholderWebConfiguration.getValue(PLACEHOLDER_WEB_ID) != null && !PlaceholderWebConfiguration.getValue(PLACEHOLDER_WEB_ID).equalsIgnoreCase("")){ placeholder_id = PlaceholderWebConfiguration.getValue(PLACEHOLDER_WEB_ID); } if (!(genericPdfObject instanceof PDFBOXObject)) { // tODO: throw new PdfAsException(); } PDFBOXObject pdfObject = (PDFBOXObject) genericPdfObject; if (!(genericSigner instanceof PDFASPDFBOXSignatureInterface)) { // tODO: throw new PdfAsException(); } PDFASPDFBOXSignatureInterface signer = (PDFASPDFBOXSignatureInterface) genericSigner; String pdfaVersion = null; PDDocument doc = null; SignatureOptions options = new SignatureOptions(); COSDocument visualSignatureDocumentGuard = null; try { doc = pdfObject.getDocument(); //if signature already exists dont create new page List pdSignatureFieldList = doc.getSignatureFields(); PDSignature signature; // sign a PDF with an existing empty signature, as created by the CreateEmptySignatureForm example. String sigFieldName = pdfObject.getStatus().getSettings().getValue(SIGNATURE_FIELD_NAME); signature = findExistingSignature(doc, sigFieldName); if (signature == null) { // create signature dictionary signature = new PDSignature(); } else { isAdobeSigForm = true; } signature.setFilter(COSName.getPDFName(signer.getPDFFilter())); signature.setSubFilter(COSName.getPDFName(signer.getPDFSubFilter())); SignaturePlaceholderData signaturePlaceholderDataInit = PlaceholderFilter.checkPlaceholderSignatureLocation(pdfObject.getStatus(), pdfObject.getStatus().getSettings(), placeholder_id); //gives a list of all placeholders List placeholders = SignaturePlaceholderExtractor.listPlaceholders(); if(placeholder_id.equalsIgnoreCase("")){ if(checkAvailablePlaceholders(placeholders,existingSignatureLocations(doc))!=null) { placeholder_id = (checkAvailablePlaceholders(placeholders, existingSignatureLocations(doc))).getId(); }; } SignaturePlaceholderData signaturePlaceholderData = PlaceholderFilter .checkPlaceholderSignatureLocation(pdfObject.getStatus(), pdfObject.getStatus().getSettings(),placeholder_id); TablePos tablePos = null; if(signaturePlaceholderData!=null) signature.setLocation(signaturePlaceholderData.getPlaceholderName()); if (signaturePlaceholderData != null) { // Placeholder found! logger.info("Placeholder data found."); if (signaturePlaceholderData.getProfile() != null) { logger.debug("Placeholder Profile set to: " + signaturePlaceholderData.getProfile()); requestedSignature.setSignatureProfileID(signaturePlaceholderData.getProfile()); } tablePos = signaturePlaceholderData.getTablePos(); if (tablePos != null) { SignatureProfileConfiguration signatureProfileConfiguration = pdfObject.getStatus() .getSignatureProfileConfiguration(requestedSignature.getSignatureProfileID()); float minWidth = signatureProfileConfiguration.getMinWidth(); if(minWidth > 0) { if (tablePos.getWidth() < minWidth) { tablePos.width = minWidth; logger.debug("Correcting placeholder with to minimum width {}", minWidth); } } logger.debug("Placeholder Position set to: " + tablePos.toString()); } } SignatureProfileSettings signatureProfileSettings = TableFactory .createProfile(requestedSignature.getSignatureProfileID(), pdfObject.getStatus().getSettings()); //Check if input document is PDF-A conform if (signatureProfileSettings.isPDFA()) { DataSource origDoc = pdfObject.getOriginalDocument(); InputStream stream = origDoc.getInputStream(); //Run PreflightParser for checking conformity// //runPDFAPreflight(origDoc); } ValueResolver resolver = new ValueResolver(requestedSignature, pdfObject.getStatus()); String signerName = resolver.resolve("SIG_SUBJECT", signatureProfileSettings.getValue("SIG_SUBJECT"), signatureProfileSettings); signature.setName(signerName); signature.setSignDate(Calendar.getInstance()); String signerReason = signatureProfileSettings.getSigningReason(); if (signerReason == null) { signerReason = "PAdES Signature"; } signature.setReason(signerReason); logger.debug("Signing reason: " + signerReason); logger.debug("Signing @ " + signer.getSigningDate().getTime().toString()); // the signing date, needed for valid signature // signature.setSignDate(signer.getSigningDate()); signer.setPDSignature(signature); int signatureSize = 0x1000; try { String reservedSignatureSizeString = signatureProfileSettings.getValue(SIG_RESERVED_SIZE); if (reservedSignatureSizeString != null) { signatureSize = Integer.parseInt(reservedSignatureSizeString); } logger.debug("Reserving {} bytes for signature", signatureSize); } catch (NumberFormatException e) { logger.warn("Invalid configuration value: {} should be a number using 0x1000", SIG_RESERVED_SIZE); } options.setPreferredSignatureSize(signatureSize); if(signatureProfileSettings.isPDFA() || signatureProfileSettings.isPDFA3()) { pdfaVersion = getPDFAVersion(doc); signatureProfileSettings.setPDFAVersion(pdfaVersion); } // Is visible Signature if (requestedSignature.isVisual()) { logger.info("Creating visual siganture block"); SignatureProfileConfiguration signatureProfileConfiguration = pdfObject.getStatus() .getSignatureProfileConfiguration(requestedSignature.getSignatureProfileID()); if (tablePos == null) { // ================================================================ // PositioningStage (visual) -> find position or use // fixed // position String posString = pdfObject.getStatus().getSignParamter().getSignaturePosition(); TablePos signaturePos = null; String signaturePosString = signatureProfileConfiguration.getDefaultPositioning(); if (signaturePosString != null) { logger.debug("using signature Positioning: " + signaturePos); signaturePos = new TablePos(signaturePosString); } logger.debug("using Positioning: " + posString); if (posString != null) { // Merge Signature Position tablePos = new TablePos(posString, signaturePos); } else { // Fallback to signature Position! tablePos = signaturePos; } if (tablePos == null) { // Last Fallback default position tablePos = new TablePos(); } } //Legacy Modes not supported with pdfbox2 anymore // boolean legacy32Position = signatureProfileConfiguration.getLegacy32Positioning(); // boolean legacy40Position = signatureProfileConfiguration.getLegacy40Positioning(); // create Table describtion Table main = TableFactory.createSigTable(signatureProfileSettings, MAIN, pdfObject.getStatus(), requestedSignature); IPDFStamper stamper = StamperFactory.createDefaultStamper(pdfObject.getStatus().getSettings()); IPDFVisualObject visualObject = stamper.createVisualPDFObject(pdfObject, main); /* * PDDocument originalDocument = PDDocument .load(new * ByteArrayInputStream(pdfObject.getStatus() * .getPdfObject().getOriginalDocument())); */ PositioningInstruction positioningInstruction = Positioning.determineTablePositioning(tablePos, "", doc, visualObject, pdfObject.getStatus().getSettings()); logger.debug("Positioning: {}", positioningInstruction.toString()); if(!isAdobeSigForm) { if (positioningInstruction.isMakeNewPage()) { int last = doc.getNumberOfPages() - 1; PDDocumentCatalog root = doc.getDocumentCatalog(); PDPage lastPage = root.getPages().get(last); root.getPages().getCOSObject().setNeedToBeUpdated(true); PDPage p = new PDPage(lastPage.getMediaBox()); p.setResources(new PDResources()); p.setRotation(lastPage.getRotation()); doc.addPage(p); } // handle rotated page int targetPageNumber = positioningInstruction.getPage(); logger.debug("Target Page: " + targetPageNumber); PDPage targetPage = doc.getPages().get(targetPageNumber - 1); int rot = targetPage.getRotation(); logger.debug("Page rotation: " + rot); logger.debug("resulting Sign rotation: " + positioningInstruction.getRotation()); SignaturePositionImpl position = new SignaturePositionImpl(); position.setX(positioningInstruction.getX()); position.setY(positioningInstruction.getY()); position.setPage(positioningInstruction.getPage()); position.setHeight(visualObject.getHeight()); position.setWidth(visualObject.getWidth()); requestedSignature.setSignaturePosition(position); } properties = new PDFAsVisualSignatureProperties(pdfObject.getStatus().getSettings(), pdfObject, (PdfBoxVisualObject) visualObject, positioningInstruction, signatureProfileSettings); properties.buildSignature(); /* * ByteArrayOutputStream sigbos = new * ByteArrayOutputStream(); * sigbos.write(StreamUtils.inputStreamToByteArray * (properties .getVisibleSignature())); sigbos.close(); */ /*if (signaturePlaceholderData != null) { InputStream fis = PADESPDFBOXSigner.class.getResourceAsStream("/placeholder/empty.jpg"); PDImageXObject img = JPEGFactory.createFromStream(doc, fis); img.getCOSObject().setNeedToBeUpdated(true); // PDDocumentCatalog root = doc.getDocumentCatalog(); // PDPageNode rootPages = root.getPages(); // List kids = new ArrayList(); // rootPages.getAllKids(kids); int pageNumber = positioningInstruction.getPage(); PDPage page = doc.getPages().get(pageNumber - 1); logger.info("Placeholder name: " + signaturePlaceholderData.getPlaceholderName()); COSDictionary xobjectsDictionary = (COSDictionary) page.getResources().getCOSObject() .getDictionaryObject(COSName.XOBJECT); xobjectsDictionary.setItem(signaturePlaceholderData.getPlaceholderName(), img); xobjectsDictionary.setNeedToBeUpdated(true); page.getResources().getCOSObject().setNeedToBeUpdated(true); logger.info("Placeholder name: " + signaturePlaceholderData.getPlaceholderName()); }*/ if (signatureProfileSettings.isPDFA() || signatureProfileSettings.isPDFA3()) { PDDocumentCatalog root = doc.getDocumentCatalog(); COSBase base = root.getCOSObject().getItem(COSName.OUTPUT_INTENTS); InputStream colorProfile = null; //colorProfile = this.getClass().getResourceAsStream("/icm/sRGB.icm"); colorProfile = this.getClass().getResourceAsStream("/icm/sRGB Color Space Profile.icm"); //Set output intents for PDF/A conformity// try { PDOutputIntent intent = new PDOutputIntent(doc, colorProfile); intent.setInfo("sRGB IEC61966-2.1"); intent.setOutputCondition("sRGB IEC61966-2.1"); intent.setOutputConditionIdentifier("sRGB IEC61966-2.1"); intent.setRegistryName("http://www.color.org"); List oi = new ArrayList(); oi.add(intent); root.setOutputIntents(oi); root.getCOSObject().setNeedToBeUpdated(true); logger.info("added Output Intent"); } catch (Throwable e) { e.printStackTrace(); throw new PdfAsException("Failed to add Output Intent", e); } finally { IOUtils.closeQuietly(colorProfile); } } options.setPage(positioningInstruction.getPage()-1); options.setVisualSignature(properties.getVisibleSignature()); } visualSignatureDocumentGuard = options.getVisualSignature(); doc.addSignature(signature, signer, options); if (sigFieldName == null) { sigFieldName = "PDF-AS Signatur"; } int count = PdfBoxUtils.countSignatures(doc, sigFieldName); sigFieldName = sigFieldName + count; PDAcroForm acroFormm = doc.getDocumentCatalog().getAcroForm(); // PDStructureTreeRoot pdstRoot = // doc.getDocumentCatalog().getStructureTreeRoot(); // COSDictionary dic = // doc.getDocumentCatalog().getCOSDictionary(); // PDStructureElement el = new PDStructureElement("Widget", // pdstRoot); //this is not used for Adobe signature fields if(!isAdobeSigForm) { PDSignatureField signatureField = null; if (acroFormm != null) { @SuppressWarnings("unchecked") List fields = acroFormm.getFields(); if (fields != null) { for (PDField pdField : fields) { if (pdField != null) { if (pdField instanceof PDSignatureField) { PDSignatureField tmpSigField = (PDSignatureField) pdField; if (tmpSigField.getSignature() != null && tmpSigField.getSignature().getCOSObject() != null) { if (tmpSigField.getSignature().getCOSObject() .equals(signature.getCOSObject())) { signatureField = (PDSignatureField) pdField; } } } } } } else { logger.warn("Failed to name Signature Field! [Cannot find Field list in acroForm!]"); } if (signatureField != null) { signatureField.setPartialName(sigFieldName); } if (properties != null) { signatureField.setAlternateFieldName(properties.getAlternativeTableCaption()); } else { signatureField.setAlternateFieldName(sigFieldName); } } else { logger.warn("Failed to name Signature Field! [Cannot find acroForm!]"); } } PDSignatureField signatureField = null; PDAcroForm acroForm = doc.getDocumentCatalog().getAcroForm(); if (acroForm != null) { signatureField = (PDSignatureField) acroForm.getField(sigFieldName); } // PDF-UA logger.info("Adding pdf/ua content."); try { PDDocumentCatalog root = doc.getDocumentCatalog(); PDStructureTreeRoot structureTreeRoot = root.getStructureTreeRoot(); if (structureTreeRoot != null) { logger.info("Tree Root: {}", structureTreeRoot.toString()); List kids = structureTreeRoot.getKids(); if (kids == null) { logger.info("No kid-elements in structure tree Root, maybe not PDF/UA document"); } PDStructureElement docElement = null; for (Object k : kids) { if (k instanceof PDStructureElement) { docElement = (PDStructureElement) k; break; } } PDStructureElement sigBlock = new PDStructureElement("Form", docElement); // create object dictionary and add as child element COSDictionary objectDic = new COSDictionary(); objectDic.setName("Type", "OBJR"); objectDic.setItem("Pg", signatureField.getWidget().getPage()); objectDic.setItem("Obj", signatureField.getWidget()); List l = new ArrayList(); l.add(objectDic); sigBlock.setKids(l); sigBlock.setPage(signatureField.getWidget().getPage()); sigBlock.setTitle("Signature Table"); sigBlock.setParent(docElement); docElement.appendKid(sigBlock); // Create and add Attribute dictionary to mitigate PAC // warning COSDictionary sigBlockDic = (COSDictionary) sigBlock.getCOSObject(); COSDictionary sub = new COSDictionary(); sub.setName("O", "Layout"); sub.setName("Placement", "Block"); sigBlockDic.setItem(COSName.A, sub); sigBlockDic.setNeedToBeUpdated(true); // Modify number tree PDNumberTreeNode ntn = structureTreeRoot.getParentTree(); int parentTreeNextKey = structureTreeRoot.getParentTreeNextKey(); if (ntn == null) { ntn = new PDNumberTreeNode(objectDic, null); logger.info("No number-tree-node found!"); } COSArray ntnKids = (COSArray) ntn.getCOSObject().getDictionaryObject(COSName.KIDS); COSArray ntnNumbers = (COSArray) ntn.getCOSObject().getDictionaryObject(COSName.NUMS); if(ntnNumbers == null && ntnKids != null){//no number array, so continue with the kids array //create dictionary with limits and nums array COSDictionary pTreeEntry = new COSDictionary(); COSArray limitsArray = new COSArray(); //limits for exact one entry limitsArray.add(COSInteger.get(parentTreeNextKey)); limitsArray.add(COSInteger.get(parentTreeNextKey)); COSArray numsArray = new COSArray(); numsArray.add(COSInteger.get(parentTreeNextKey)); numsArray.add(sigBlock); pTreeEntry.setItem(COSName.NUMS, numsArray); pTreeEntry.setItem(COSName.LIMITS, limitsArray); PDNumberTreeNode newKidsElement = new PDNumberTreeNode(pTreeEntry, PDNumberTreeNode.class); ntnKids.add(newKidsElement); ntnKids.setNeedToBeUpdated(true); }else if(ntnNumbers != null && ntnKids == null){ int arrindex = ntnNumbers.size(); ntnNumbers.add(arrindex, COSInteger.get(parentTreeNextKey)); ntnNumbers.add(arrindex + 1, sigBlock.getCOSObject()); ntnNumbers.setNeedToBeUpdated(true); structureTreeRoot.setParentTree(ntn); }else if(ntnNumbers == null && ntnKids == null){ //document is not pdfua conform before signature creation throw new PdfAsException("error.pdf.sig.pdfua.1"); }else{ //this is not allowed throw new PdfAsException("error.pdf.sig.pdfua.1"); } // set StructureParent for signature field annotation signatureField.getWidget().setStructParent(parentTreeNextKey); //Increase the next Key value in the structure tree root structureTreeRoot.setParentTreeNextKey(parentTreeNextKey+1); // add the Tabs /S Element for Tabbing through annots PDPage p = signatureField.getWidget().getPage(); p.getCOSObject().setName("Tabs", "S"); p.getCOSObject().setNeedToBeUpdated(true); //check alternative signature field name if (signatureField != null) { if(signatureField.getAlternateFieldName().equals("")) signatureField.setAlternateFieldName(sigFieldName); } ntn.getCOSObject().setNeedToBeUpdated(true); sigBlock.getCOSObject().setNeedToBeUpdated(true); structureTreeRoot.getCOSObject().setNeedToBeUpdated(true); objectDic.setNeedToBeUpdated(true); docElement.getCOSObject().setNeedToBeUpdated(true); } } catch (Throwable e) { if (signatureProfileSettings.isPDFUA() == true) { logger.error("Could not create PDF-UA conform document!"); throw new PdfAsException("error.pdf.sig.pdfua.1", e); } else { logger.info("Could not create PDF-UA conform signature"); } } try { ByteArrayOutputStream bos = new ByteArrayOutputStream(); synchronized (doc) { doc.saveIncremental(bos); byte[] outputDocument = bos.toByteArray(); pdfObject.setSignedDocument(outputDocument); } /* Check if resulting pdf is PDF-A conform */ if (signatureProfileSettings.isPDFA()) { runPDFAPreflight(new ByteArrayDataSource(pdfObject.getSignedDocument())); } } catch (IOException e1) { e1.printStackTrace(); } finally { if (options != null) { if (options.getVisualSignature() != null) { options.getVisualSignature().close(); } } } System.gc(); } catch (IOException e) { logger.warn(MessageResolver.resolveMessage("error.pdf.sig.01"), e); throw new PdfAsException("error.pdf.sig.01", e); } finally { if (doc != null) { try { doc.close(); } catch (IOException e) { logger.debug("Failed to close COS Doc!", e); // Ignore } } logger.debug("Signature done!"); } } /** * Check via PreFlightParser if PDF-Document is a valid PDFA1 * @param signedDocument: signed Document * @throws PdfAsException */ private void runPDFAPreflight(final DataSource signedDocument) throws PdfAsException { PreflightDocument document = null; ValidationResult result = null; try { PreflightParser parser = new PreflightParser(signedDocument); // // parser.parse(Format.PDF_A1B); parser.parse(); document = parser.getPreflightDocument(); document.validate(); document.close(); result = document.getResult(); logger.info("PDF-A Validation Result: " + result.isValid()); if (result.getErrorsList().size() > 0) { logger.error("The following validation errors occured for PDF-A validation"); } for (ValidationResult.ValidationError ve : result.getErrorsList()) { logger.error("\t" + ve.getErrorCode() + ": " + ve.getDetails()); } if (!result.isValid()) { logger.info("The file is not a valid PDF-A document"); } } catch (SyntaxValidationException e) { logger.error("The file is syntactically invalid.", e); throw new PdfAsException("Resulting PDF Document is syntactically invalid."); } catch (ValidationException e) { logger.error("The file is not a valid PDF-A document.", e); } catch (IOException e) { logger.error("An IOException (" + e.getMessage() + ") occurred, while validating the PDF-A conformance", e); throw new PdfAsException("Failed validating PDF Document IOException."); } catch (RuntimeException e) { logger.debug("An RuntimeException (" + e.getMessage() + ") occurred, while validating the PDF-A conformance", e); throw new PdfAsException("Failed validating PDF Document RuntimeException."); } finally { if (document != null) { IOUtils.closeQuietly(document); } } } @Override public PDFObject buildPDFObject(OperationStatus operationStatus) { return new PDFBOXObject(operationStatus); } @Override public PDFASSignatureInterface buildSignaturInterface(IPlainSigner signer, SignParameter parameters, RequestedSignature requestedSignature) { return new PdfboxSignerWrapper(signer, parameters, requestedSignature); } @Override public PDFASSignatureExtractor buildBlindSignaturInterface(X509Certificate certificate, String filter, String subfilter, Calendar date) { return new SignatureDataExtractor(certificate, filter, subfilter, date); } @Override public void checkPDFPermissions(PDFObject genericPdfObject) throws PdfAsException { if (!(genericPdfObject instanceof PDFBOXObject)) { // tODO: throw new PdfAsException(); } PDFBOXObject pdfObject = (PDFBOXObject) genericPdfObject; PdfBoxUtils.checkPDFPermissions(pdfObject.getDocument()); } @Override public byte[] rewritePlainSignature(byte[] plainSignature) { String signature = new COSString(plainSignature).toHexString(); byte[] pdfSignature = signature.getBytes(); return pdfSignature; } @Override public Image generateVisibleSignaturePreview(SignParameter parameter, java.security.cert.X509Certificate cert, int resolution, OperationStatus status, RequestedSignature requestedSignature) throws PDFASError { try { PDFBOXObject pdfObject = (PDFBOXObject) status.getPdfObject(); PDDocument origDoc = new PDDocument(); origDoc.addPage(new PDPage(PDRectangle.A4)); ByteArrayOutputStream baos = new ByteArrayOutputStream(); origDoc.save(baos); baos.close(); pdfObject.setOriginalDocument(new ByteArrayDataSource(baos.toByteArray())); SignatureProfileSettings signatureProfileSettings = TableFactory .createProfile(requestedSignature.getSignatureProfileID(), pdfObject.getStatus().getSettings()); // create Table describtion Table main = TableFactory.createSigTable(signatureProfileSettings, MAIN, pdfObject.getStatus(), requestedSignature); IPDFStamper stamper = StamperFactory.createDefaultStamper(pdfObject.getStatus().getSettings()); IPDFVisualObject visualObject = stamper.createVisualPDFObject(pdfObject, main); SignatureProfileConfiguration signatureProfileConfiguration = pdfObject.getStatus() .getSignatureProfileConfiguration(requestedSignature.getSignatureProfileID()); String signaturePosString = signatureProfileConfiguration.getDefaultPositioning(); PositioningInstruction positioningInstruction; if (signaturePosString != null) { positioningInstruction = Positioning.determineTablePositioning(new TablePos(signaturePosString), "", origDoc, visualObject, pdfObject.getStatus().getSettings()); } else { positioningInstruction = Positioning.determineTablePositioning(new TablePos(), "", origDoc, visualObject, pdfObject.getStatus().getSettings()); } origDoc.close(); SignaturePositionImpl position = new SignaturePositionImpl(); position.setX(positioningInstruction.getX()); position.setY(positioningInstruction.getY()); position.setPage(positioningInstruction.getPage()); position.setHeight(visualObject.getHeight()); position.setWidth(visualObject.getWidth()); requestedSignature.setSignaturePosition(position); PDFAsVisualSignatureProperties properties = new PDFAsVisualSignatureProperties( pdfObject.getStatus().getSettings(), pdfObject, (PdfBoxVisualObject) visualObject, positioningInstruction, signatureProfileSettings); properties.buildSignature(); PDDocument visualDoc; synchronized (PDDocument.class) { visualDoc = PDDocument.load(properties.getVisibleSignature()); } // PDPageable pageable = new PDPageable(visualDoc); PDPage firstPage = visualDoc.getDocumentCatalog().getPages().get(0); float stdRes = 72; float targetRes = resolution; float factor = targetRes / stdRes; int targetPageNumber = 0;//TODO: is this always the case PDFRenderer pdfRenderer = new PDFRenderer(visualDoc); BufferedImage outputImage = pdfRenderer.renderImageWithDPI(targetPageNumber, targetRes, ImageType.ARGB); //BufferedImage outputImage = firstPage.convertToImage(BufferedImage.TYPE_4BYTE_ABGR, (int) targetRes); BufferedImage cutOut = new BufferedImage((int) (position.getWidth() * factor), (int) (position.getHeight() * factor), BufferedImage.TYPE_4BYTE_ABGR); Graphics2D graphics = (Graphics2D) cutOut.getGraphics(); graphics.drawImage(outputImage, 0, 0, cutOut.getWidth(), cutOut.getHeight(), (int) (1 * factor), (int) (outputImage.getHeight() - ((position.getHeight() + 1) * factor)), (int) ((1 + position.getWidth()) * factor), (int) (outputImage.getHeight() - ((position.getHeight() + 1) * factor) + (position.getHeight() * factor)), null); return cutOut; } catch (PdfAsException e) { logger.warn("PDF-AS Exception", e); throw ErrorExtractor.searchPdfAsError(e, status); } catch (Throwable e) { logger.warn("Unexpected Throwable Exception", e); throw ErrorExtractor.searchPdfAsError(e, status); } } private String getPDFAVersion(PDDocument doc) { try { PDDocumentCatalog cat = doc.getDocumentCatalog(); PDMetadata metadata = cat.getMetadata(); if (metadata != null) { DomXmpParser xmpParser = new DomXmpParser(); XMPMetadata xmpMetadata = xmpParser.parse(metadata.exportXMPMetadata()); if (xmpMetadata != null) { PDFAIdentificationSchema pdfaIdentificationSchema = xmpMetadata.getPDFIdentificationSchema(); if (pdfaIdentificationSchema != null) { Integer pdfaversion = pdfaIdentificationSchema.getPart(); String conformance = pdfaIdentificationSchema.getConformance(); logger.info("Detected PDF/A Version: {} - {}", pdfaversion, conformance); if (pdfaversion != null) { return String.valueOf(pdfaversion); } } } } } catch (Throwable e) { logger.warn("Failed to determine PDF/A Version!", e); } return null; } // Find an existing signature. private PDSignature findExistingSignature(PDDocument doc, String sigFieldName) { PDSignature signature = null; PDSignatureField signatureField; PDAcroForm acroForm = doc.getDocumentCatalog().getAcroForm(); if (acroForm != null) { signatureField = (PDSignatureField) acroForm.getField(sigFieldName); if (signatureField != null) { // retrieve signature dictionary signature = signatureField.getSignature(); if (signature == null) { signature = new PDSignature(); signatureField.getCOSObject().setItem(COSName.V, signature); } else { throw new IllegalStateException("The signature field " + sigFieldName + " is already signed."); } } } return signature; } private List existingSignatureLocations(PDDocument doc) { List existingLocations = new ArrayList<>(); try { List pdSignatureList = doc.getSignatureDictionaries(); if(pdSignatureList.size() != 0) { for(PDSignature sig : pdSignatureList) { existingLocations.add(sig.getLocation()); } } } catch (IOException e) { e.printStackTrace(); } return existingLocations; } //find first available placeholder public SignaturePlaceholderData checkAvailablePlaceholders(List placeholders, List existingPlaceholders) { SignaturePlaceholderData result = null; for(int i = 0; i < placeholders.size(); ++i) { if(!existingPlaceholders.contains(placeholders.get(i).getPlaceholderName())) { result = placeholders.get(i); break; } } return result; } }