package at.gv.egiz.pdfas.placeholder; import java.awt.geom.AffineTransform; import java.awt.geom.NoninvertibleTransformException; import java.awt.image.BufferedImage; import java.io.IOException; import java.io.InputStream; import java.util.Hashtable; import java.util.Iterator; import java.util.List; import java.util.Map; import java.util.Vector; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import org.apache.pdfbox.cos.COSName; import org.apache.pdfbox.exceptions.WrappedIOException; import org.apache.pdfbox.pdmodel.PDDocument; import org.apache.pdfbox.pdmodel.PDPage; import org.apache.pdfbox.pdmodel.graphics.xobject.PDXObject; import org.apache.pdfbox.pdmodel.graphics.xobject.PDXObjectImage; import org.apache.pdfbox.util.Matrix; import org.apache.pdfbox.util.PDFOperator; import org.apache.pdfbox.util.PDFStreamEngine; import org.apache.pdfbox.util.ResourceLoader; import at.gv.egiz.pdfas.api.sign.SignParameters; import at.gv.egiz.pdfas.exceptions.ErrorCode; import at.gv.egiz.pdfas.exceptions.framework.PlaceholderExtractionException; import at.gv.egiz.pdfas.utils.PDFASUtils; import at.knowcenter.wag.egov.egiz.exceptions.PDFDocumentException; import at.knowcenter.wag.egov.egiz.pdf.TablePos; import com.google.zxing.BarcodeFormat; import com.google.zxing.BinaryBitmap; import com.google.zxing.DecodeHintType; import com.google.zxing.LuminanceSource; import com.google.zxing.MultiFormatReader; import com.google.zxing.NotFoundException; import com.google.zxing.ReaderException; import com.google.zxing.Result; import com.google.zxing.client.j2se.BufferedImageLuminanceSource; import com.google.zxing.common.HybridBinarizer; /** * Extract all relevant information from a placeholder image. * * @author exthex * */ public class SignaturePlaceholderExtractor extends PDFStreamEngine { /** * The log. */ private static Log log = LogFactory.getLog(SignaturePlaceholderExtractor.class); private List placeholders = new Vector(); private int currentPage = 0; private SignaturePlaceholderExtractor(String placeholderId, int placeholderMatchMode) throws IOException { super(ResourceLoader.loadProperties("at/gv/egiz/pdfas/placeholder/pdfbox-reader.properties", true)); } /** * Search the document for placeholder images and possibly included * additional info.
* Searches only for the first placeholder page after page from top. * * @param inputStream * @return all available info from the first found placeholder. * @throws PDFDocumentException if the document could not be read. * @throws PlaceholderExtractionException if STRICT matching mode was requested and no suitable placeholder could be found. */ public static SignaturePlaceholderData extract(InputStream inputStream, String placeholderId, int matchMode) throws PDFDocumentException, PlaceholderExtractionException { SignaturePlaceholderContext.setSignaturePlaceholderData(null); PDDocument doc = null; try { try { doc = PDDocument.load(inputStream); } catch (IOException e) { throw new PDFDocumentException(ErrorCode.DOCUMENT_CANNOT_BE_READ, e); } PDFASUtils.checkDocumentPermissions(doc); SignaturePlaceholderExtractor extractor; try { extractor = new SignaturePlaceholderExtractor(placeholderId, matchMode); } catch (IOException e2) { throw new PDFDocumentException(ErrorCode.DOCUMENT_CANNOT_BE_READ, e2); } List pages = doc.getDocumentCatalog().getAllPages(); Iterator iter = pages.iterator(); int pageNr = 0; while (iter.hasNext()) { pageNr++; PDPage page = (PDPage) iter.next(); try { extractor.setCurrentPage(pageNr); extractor.processStream( page, page.findResources(), page.getContents().getStream() ); SignaturePlaceholderData ret = matchPlaceholderPage(extractor.placeholders, placeholderId, matchMode); if (ret != null){ SignaturePlaceholderContext.setSignaturePlaceholderData(ret); return ret; } } catch (IOException e1) { throw new PDFDocumentException(ErrorCode.DOCUMENT_CANNOT_BE_READ, e1); } } if (extractor.placeholders.size() > 0){ SignaturePlaceholderData ret = matchPlaceholderDocument(extractor.placeholders, placeholderId, matchMode); SignaturePlaceholderContext.setSignaturePlaceholderData(ret); return ret; } return null; }finally{ if (doc != null) try { doc.close(); } catch (IOException e) { log.debug("Could not close document.", e); } } } private static SignaturePlaceholderData matchPlaceholderDocument( List placeholders, String placeholderId, int matchMode) throws PlaceholderExtractionException { if (matchMode == SignParameters.PLACEHOLDER_MATCH_MODE_STRICT) throw new PlaceholderExtractionException(ErrorCode.SIGNATURE_PLACEHOLDER_EXTRACTION_FAILED, "no suitable placeholder found and STRICT matching mode requested."); if (placeholders.size() == 0) return null; for (int i = 0; i < placeholders.size(); i++) { SignaturePlaceholderData spd = (SignaturePlaceholderData)placeholders.get(i); if (spd.getId() == null) return spd; } if (matchMode == SignParameters.PLACEHOLDER_MATCH_MODE_LENIENT) return (SignaturePlaceholderData)placeholders.get(0); return null; } private static SignaturePlaceholderData matchPlaceholderPage(List placeholders, String placeholderId, int matchMode) { if (placeholders.size() == 0) return null; for (int i = 0; i < placeholders.size(); i++) { SignaturePlaceholderData data = (SignaturePlaceholderData)placeholders.get(i); if (placeholderId != null && placeholderId.equals(data.getId())) return data; if (placeholderId == null && data.getId() == null) return data; } return null; } private void setCurrentPage(int pageNr) { this.currentPage = pageNr; } protected void processOperator( PDFOperator operator, List arguments ) throws IOException { String operation = operator.getOperation(); if( operation.equals( "Do" ) ) { COSName objectName = (COSName)arguments.get( 0 ); Map xobjects = getResources().getXObjects(); PDXObject xobject = (PDXObject)xobjects.get( objectName.getName() ); if( xobject instanceof PDXObjectImage ) { try { PDXObjectImage image = (PDXObjectImage)xobject; SignaturePlaceholderData data = checkImage(image); if (data != null) { PDPage page = getCurrentPage(); Matrix ctm = getGraphicsState().getCurrentTransformationMatrix(); double rotationInRadians = (page.findRotation() * Math.PI)/180; AffineTransform rotation = new AffineTransform(); rotation.setToRotation( rotationInRadians ); AffineTransform rotationInverse = rotation.createInverse(); Matrix rotationInverseMatrix = new Matrix(); rotationInverseMatrix.setFromAffineTransform( rotationInverse ); Matrix rotationMatrix = new Matrix(); rotationMatrix.setFromAffineTransform( rotation ); Matrix unrotatedCTM = ctm.multiply( rotationInverseMatrix ); float x = unrotatedCTM.getXPosition() - 1F; float y = unrotatedCTM.getYPosition() + unrotatedCTM.getYScale() + 1F; float w = unrotatedCTM.getXScale() + 2F; String posString = "p:" + currentPage + ";x:" + x + ";y:" + y + ";w:" + w; try { data.setTablePos(new TablePos(posString)); data.setPlaceholderName(objectName.getName()); placeholders.add(data); } catch (PDFDocumentException e) { throw new WrappedIOException(e); } } } catch( NoninvertibleTransformException e ) { throw new WrappedIOException( e ); } } } else { super.processOperator( operator, arguments ); } } /** * Checks an image if it is a placeholder for a signature. * * @param image * @return * @throws IOException */ private SignaturePlaceholderData checkImage(PDXObjectImage image) throws IOException { BufferedImage bimg = image.getRGBImage(); if(bimg.getHeight() < 10 || bimg.getWidth() < 10) return null; LuminanceSource source = new BufferedImageLuminanceSource(bimg); BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source)); Result result; long before = System.currentTimeMillis(); try { Hashtable hints = new Hashtable(); Vector formats = new Vector(); formats.add(BarcodeFormat.QR_CODE); hints.put(DecodeHintType.POSSIBLE_FORMATS, formats); result = new MultiFormatReader().decode(bitmap, hints); String text = result.getText(); String profile = null; String type = null; String sigKey = null; String id = null; if (text != null && text.startsWith("PDF-AS-POS")) { String[] data = text.split(";"); if (data.length > 1) { for (int i = 1; i < data.length; i++) { String kvPair = data[i]; String[] kv = kvPair.split("="); if (kv.length != 2) { log.debug("invalid parameter in placeholder data: " + kvPair); } else { if (kv[0].equalsIgnoreCase(SignaturePlaceholderData.ID_KEY)) { id = kv[1]; } else if (kv[0].equalsIgnoreCase(SignaturePlaceholderData.PROFILE_KEY)) { profile = kv[1]; } else if (kv[0] .equalsIgnoreCase(SignaturePlaceholderData.SIG_KEY_KEY)) { sigKey = kv[1]; } else if (kv[0] .equalsIgnoreCase(SignaturePlaceholderData.TYPE_KEY)) { type = kv[1]; } } } } return new SignaturePlaceholderData(profile, type, sigKey, id); } } catch (ReaderException re) { if (log.isDebugEnabled()) { log.debug("Could not decode - not a placeholder. needed: " + (System.currentTimeMillis() - before)); } if (!(re instanceof NotFoundException)){ if (log.isInfoEnabled()) { log.info("Failed to decode image", re); } } } catch(ArrayIndexOutOfBoundsException e){ if (log.isInfoEnabled()) { log.info("Failed to decode image. Probably a zxing bug", e); } } return null; } }