diff options
Diffstat (limited to 'src/main/java/at/gv/egiz/pdfas/impl/vfilter/VerificationFilterImpl.java')
| -rw-r--r-- | src/main/java/at/gv/egiz/pdfas/impl/vfilter/VerificationFilterImpl.java | 964 |
1 files changed, 0 insertions, 964 deletions
diff --git a/src/main/java/at/gv/egiz/pdfas/impl/vfilter/VerificationFilterImpl.java b/src/main/java/at/gv/egiz/pdfas/impl/vfilter/VerificationFilterImpl.java deleted file mode 100644 index 3f0f482..0000000 --- a/src/main/java/at/gv/egiz/pdfas/impl/vfilter/VerificationFilterImpl.java +++ /dev/null @@ -1,964 +0,0 @@ -/**
- * <copyright> Copyright 2006 by Know-Center, Graz, Austria </copyright>
- * 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.impl.vfilter;
-
-import java.util.ArrayList;
-import java.util.HashSet;
-import java.util.Iterator;
-import java.util.List;
-import java.util.Set;
-
-import org.apache.commons.lang.time.StopWatch;
-import org.apache.commons.logging.Log;
-import org.apache.commons.logging.LogFactory;
-
-import at.gv.egiz.pdfas.exceptions.ErrorCode;
-import at.gv.egiz.pdfas.exceptions.framework.VerificationFilterException;
-import at.gv.egiz.pdfas.framework.SignatureHolderHelper;
-import at.gv.egiz.pdfas.framework.VerificatorFactory;
-import at.gv.egiz.pdfas.framework.input.PdfDataSource;
-import at.gv.egiz.pdfas.framework.input.TextDataSource;
-import at.gv.egiz.pdfas.framework.verificator.Verificator;
-import at.gv.egiz.pdfas.framework.vfilter.VerificationFilter;
-import at.gv.egiz.pdfas.framework.vfilter.VerificationFilterParameters;
-import at.gv.egiz.pdfas.impl.input.DelimitedPdfDataSource;
-import at.gv.egiz.pdfas.impl.input.helper.DataSourceHelper;
-import at.gv.egiz.pdfas.impl.vfilter.helper.VerificationFilterBinaryHelper;
-import at.gv.egiz.pdfas.impl.vfilter.helper.VerificationFilterHelper;
-import at.gv.egiz.pdfas.impl.vfilter.partition.BinaryPartition;
-import at.gv.egiz.pdfas.impl.vfilter.partition.TextPartition;
-import at.knowcenter.wag.egov.egiz.PdfAS;
-import at.knowcenter.wag.egov.egiz.PdfASID;
-import at.knowcenter.wag.egov.egiz.cfg.SettingsReader;
-import at.knowcenter.wag.egov.egiz.exceptions.NormalizeException;
-import at.knowcenter.wag.egov.egiz.exceptions.PDFDocumentException;
-import at.knowcenter.wag.egov.egiz.exceptions.PresentableException;
-import at.knowcenter.wag.egov.egiz.exceptions.SettingsException;
-import at.knowcenter.wag.egov.egiz.exceptions.SignatureException;
-import at.knowcenter.wag.egov.egiz.exceptions.SignatureTypesException;
-import at.knowcenter.wag.egov.egiz.pdf.AbsoluteTextSignature;
-import at.knowcenter.wag.egov.egiz.pdf.EGIZDate;
-import at.knowcenter.wag.egov.egiz.pdf.NoSignatureHolder;
-import at.knowcenter.wag.egov.egiz.pdf.SignatureHolder;
-import at.knowcenter.wag.egov.egiz.pdf.TextualSignatureHolder;
-import at.knowcenter.wag.exactparser.parsing.results.FooterParseResult;
-
-/**
- * @author wprinz
- */
-public class VerificationFilterImpl implements VerificationFilter
-{
-
- /**
- * The log.
- */
- private static final Log log = LogFactory.getLog(VerificationFilterImpl.class);
-
-
- public static final String CHECK_DOCUMENT = "check_document";
- public static final String SUPRESS_EXCEPTION_WHEN_LAST_UIBLOCK_IS_NO_SIGNATURE = "supress_exception_when_last_iublock_is_no_signature";
- public static final String BINARY_ONLY = "binary_only";
- public static final String ASSUME_ONLY_SIGNATURE_BLOCKS = "assume_only_signature_blocks";
-
- /**
- * @see at.gv.egiz.pdfas.framework.vfilter.VerificationFilter#extractSignatureHolders(at.gv.egiz.pdfas.framework.input.PdfDataSource,
- * java.util.List,
- * at.gv.egiz.pdfas.framework.vfilter.VerificationFilterParameters)
- */
- public List extractSignatureHolders(final PdfDataSource pdf, List blocks, final VerificationFilterParameters parameters) throws VerificationFilterException
- {
- log.trace("extractSignaturHolders:");
- StopWatch sw = new StopWatch();
- sw.start();
-
- if (log.isDebugEnabled())
- {
- log.debug("Original IU blocks: " + blocks.size());
- debugIUBlocks(blocks);
- }
-
- unrollLinearization(blocks);
-
- if (log.isDebugEnabled())
- {
- log.debug("IU blocks without linearization: " + blocks.size());
- debugIUBlocks(blocks);
- }
-
-
- SettingsReader settings;
- try {
- settings = SettingsReader.getInstance();
- } catch (SettingsException e) {
- throw new VerificationFilterException(e);
- }
- String check_doc = settings.getSetting(CHECK_DOCUMENT, "false");
-
- // check document for textual sigs here here if binary_only is set
- if ("true".equalsIgnoreCase(check_doc) &&
- parameters.extractBinarySignaturesOnly()) {
-
- checkBinaryOnly(pdf, parameters.scanForOldSignatures());
- log.debug("checkDocument: " + sw.getTime() + "ms.");
- } else {
- log.debug("Skipping checkDocument for textual sigs.");
- }
- // end add
-
- List signatureHolderChain = null;
-
- if (parameters.extractBinarySignaturesOnly())
- {
- log.debug("Extracting only binary signatures. Binary-only mode.");
-
- signatureHolderChain = performBinaryOnly(pdf, blocks);
- }
- else
- {
- List partitions = VerificationFilterHelper.partition(pdf, blocks);
- if (log.isDebugEnabled())
- {
- debugPartitions(partitions);
- }
-
- if (parameters.assumeOnlySignatureUpdateBlocks())
- {
- log.debug("Assuming that there are only signature Incremental Update blocks. Semi-conservative mode.");
-
- signatureHolderChain = performSemiConservative(pdf, parameters.scanForOldSignatures(), blocks, partitions);
- }
- else
- {
- log.debug("Scanning complete document. Conservative mode.");
-
- signatureHolderChain = performFullConservative(pdf, parameters.scanForOldSignatures(), blocks, partitions);
- }
-
- }
-
- log.trace("extractSignaturHolders finished (" + (signatureHolderChain != null ? signatureHolderChain.size() : 0) + " elements).");
- sw.stop();
- log.debug("extractSignatureHolders: " + sw.getTime() + "ms.");
-
- return signatureHolderChain;
- }
-
- /**
- * @see at.gv.egiz.pdfas.framework.vfilter.VerificationFilter#extractSignaturHolders(at.gv.egiz.pdfas.framework.input.TextDataSource,
- * at.gv.egiz.pdfas.framework.vfilter.VerificationFilterParameters)
- */
- public List extractSignaturHolders(TextDataSource text, VerificationFilterParameters parameters) throws VerificationFilterException
- {
- if (parameters.extractBinarySignaturesOnly())
- {
- log
- .warn("A free text signature extraction was issued although the VerificationFilter was configured to detect only binary signatures (binary-only mode). The result is of course that no signatures can be found.");
-
- return new ArrayList();
- }
-
- String freetext = text.getText();
- String normalizedText = normalizeText(freetext);
-
- List foundSignatures = null;
- if (parameters.scanForOldSignatures())
- {
- log.debug("Extracting old and new signatures from text.");
-
- foundSignatures = extractNewAndOldSignaturesFromText(normalizedText);
- }
- else
- {
- log.debug("Extracting new signatures from text (not extracting old ones).");
-
- foundSignatures = extractNewSignaturesFromText(normalizedText);
- }
-
- List textOnlySignatures = filterOutBinarySignatures(foundSignatures);
-
- return textOnlySignatures;
- }
-
- protected String normalizeText(String freetext) throws VerificationFilterException
- {
- try
- {
- return PdfAS.normalizeText(freetext);
- }
- catch (NormalizeException e)
- {
- throw new VerificationFilterException(e);
- }
- }
-
- /**
- * Removes the linearization footer from the list of update blocks.
- *
- * @param blocks
- * The list of FooterParseResult objects in \prev order.
- */
- protected void unrollLinearization(List blocks)
- {
- int linearization_index = -1;
- for (int i = 0; i < blocks.size(); i++)
- {
- FooterParseResult bpr = (FooterParseResult) blocks.get(i);
-
- if (bpr.sxpr.xref_index == 0)
- {
- if (linearization_index >= 0)
- {
- throw new RuntimeException("There is more than one linearization block! index = " + i);
- }
- linearization_index = i;
- }
- }
-
- if (linearization_index >= 0)
- {
-// logger_.debug("The document is linearized - unrolling
-// linearization block " + linearization_index);
- blocks.remove(linearization_index);
- }
- }
-
- protected List performBinaryOnly(PdfDataSource pdf, List blocks) throws VerificationFilterException
- {
- return extractBinarySignaturesOnly(pdf, blocks);
- }
-
- protected List performSemiConservative(PdfDataSource pdf, boolean scanForOldSignatures, List blocks, List partitions) throws VerificationFilterException
- {
- log.debug("perform semiConservative()...");
- List binarySignatures = extractBinarySignaturesOnly(pdf, blocks);
-
- log.debug("determining last partition...");
- TextPartition lastTextPartition = VerificationFilterHelper.findLastTextPartition(partitions);
- List extractedSignatures = null;
- if (scanForOldSignatures)
- {
- SignaturesAndOld sao = extractSignaturesFromPartitionAndOld(pdf, lastTextPartition);
- extractedSignatures = sao.newSignatures;
- if (sao.oldSignature != null)
- {
- extractedSignatures.add(0, sao.oldSignature);
- }
- }
- else
- {
- log.debug("extracting signatures from last partition...");
- extractedSignatures = extractSignaturesFromPartition(pdf, lastTextPartition);
- }
-
-
- List signatureHolderChain = intermingleSignatures(binarySignatures, extractedSignatures);
-
- return signatureHolderChain;
- }
-
- protected List performFullConservative(PdfDataSource pdf, boolean scanForOldSignatures, List blocks, List partitions) throws VerificationFilterException
- {
- List binarySignatures = extractBinarySignaturesOnly(pdf, blocks);
-
- // extract signature values of found binary signature blocks and store these values in a Set
- // this set is later used to filter out the binary signatures that are recognized as text
- // signatures.
- Set binarySigValues = new HashSet();
- Iterator iterator = binarySignatures.iterator();
- while(iterator.hasNext()) {
-
- SignatureHolder sh = (SignatureHolder)iterator.next();
-
- String sigVal = sh.getSignatureObject().getSignationValue();
- binarySigValues.add(sigVal);
- }
-
- SignatureHolder oldSignature = null;
-
- //List originalPartitions = partitions;
- // This gives every IU block an own text partition
- // This allows text signatures to be found correctly if there are
- // IU blocks with disturbing text after them.
- // On the other hand, these requires extra text extractions and
- // signature searches and thereby is slow.
- List flattedOutPartitions = flattenOutTextPartitions(partitions, blocks);
- partitions = flattedOutPartitions;
-
- SettingsReader settings;
- try {
- settings = SettingsReader.getInstance();
- } catch (SettingsException e) {
- throw new VerificationFilterException(e);
- }
- String check_doc = settings.getSetting(CHECK_DOCUMENT, "false");
- boolean supressException = "true".equalsIgnoreCase(settings.getSetting(SUPRESS_EXCEPTION_WHEN_LAST_UIBLOCK_IS_NO_SIGNATURE, "false"));
-
- // flag indicating that the last IU-block of the document is a non-signature IU-block
- boolean lastBlockWasModified = false;
-
- // counter of all signatures (textual and binary) of this document
- int signatureCounter = 0;
-
- // counter of all textual signatures in this document
- int txtSigsSoFar = 0;
-
- // counter of all textual signatures in the current partition
- int txtSigsThisPartition = 0;
-
- List partitionResults = new ArrayList(partitions.size());
- List nshList = new ArrayList();
-
- boolean sigFound = false;
-
- for (int i = 0; i < partitions.size(); i++)
- {
- Partition p = (Partition) partitions.get(i);
-
- // updating flag and counter
- boolean partitionContainsNewTextSignatures = true;
- txtSigsSoFar = txtSigsThisPartition;
-
- if (p instanceof TextPartition)
- {
- TextPartition tp = (TextPartition) p;
-
- List partitionResult = null;
-
- boolean scanThisPartitionForOldSignature = (i == 0) && scanForOldSignatures;
- if (scanThisPartitionForOldSignature)
- {
- SignaturesAndOld sao = extractSignaturesFromPartitionAndOld(pdf, tp);
- partitionResult = sao.newSignatures;
- oldSignature = sao.oldSignature;
- }
- else
- {
- partitionResult = extractSignaturesFromPartition(pdf, tp);
- }
-
- // binary signature blocks that have been detected as well are identified by comparing their signature values
- // with those stored in our Set above and are not considered for our IU-check
- List onlyTextSignatures = new ArrayList();
- Iterator iter = partitionResult.iterator();
- while(iter.hasNext()) {
-
- SignatureHolder sh = (SignatureHolder)iter.next();
- if(!binarySigValues.contains(sh.getSignatureObject().getSignationValue())) {
-
- onlyTextSignatures.add(sh);
- }
- }
-
- // update signature counters
- txtSigsThisPartition = onlyTextSignatures.size();
- int newTextSignatures = txtSigsThisPartition - txtSigsSoFar;
- signatureCounter = signatureCounter + newTextSignatures;
-
- // update sigFound flag
- if(txtSigsThisPartition > 0) {
-
- sigFound = true;
- }
-
- // TextPartition is only valid, if at least one more text signature has been found than in the previous text partition
- if(!(newTextSignatures > 0)) {
-
- partitionContainsNewTextSignatures = false;
- }
-
- partitionResults.add(partitionResult);
- } else {
- // should be binary partition
- if(p instanceof BinaryPartition) {
-
- BinaryPartition binpart = (BinaryPartition)p;
-
- // updating counter and flag
- signatureCounter = signatureCounter + binpart.blocks.size();
- sigFound = true;
-
- }
- }
-
- // if document checking is enabled, at least one signature has been found so far, we are dealing with a
- // non-signature IU-block
- if ((check_doc.equalsIgnoreCase("true"))&& (sigFound && !partitionContainsNewTextSignatures)) {
-
- nshList.add(new NoSignatureHolder(signatureCounter));
- lastBlockWasModified = true;
-
- } else {
-
- lastBlockWasModified = false;
- }
-
- }
-
- // throw an exception if the last update block does not contain a signature and signatures have been found in this document
- if (lastBlockWasModified) {
- if (!supressException) {
- throw new VerificationFilterException(ErrorCode.MODIFIED_AFTER_SIGNATION, "The document has been modified after being signed.");
- } else {
- log.debug("The document has been modified after being signed. According to the configuration, no exception is thrown.");
- }
- }
-
- List extractedSignatures = new ArrayList();
- Iterator it = partitionResults.iterator();
- List prevPartitionResult = null;
- while (it.hasNext())
- {
- List partitionResult = (List) it.next();
-
- if (prevPartitionResult == null)
- {
- extractedSignatures.addAll(partitionResult);
- }
- else
- {
- assert partitionResult.size() >= prevPartitionResult.size();
-
-// for (int i = prevPartitionResult.size(); i < partitionResult.size(); i++)
-// {
-// SignatureHolder sh = (SignatureHolder) partitionResult.get(i);
-// extractedSignatures.add(sh);
-// }
- mergeSignatures(prevPartitionResult, partitionResult, extractedSignatures);
- }
-
- prevPartitionResult = partitionResult;
- }
-
- List signatureHolderChain = intermingleSignatures(binarySignatures, extractedSignatures);
-
- if (oldSignature != null)
- {
- signatureHolderChain.add(0, oldSignature);
- }
-
- // add the created NoSignatureHolders
- signatureHolderChain.addAll(nshList);
-
- return signatureHolderChain;
- }
-
- private void mergeSignatures(List oldList, List newList, List result) {
-
- for(int i=0; i < newList.size(); i++) {
-
- SignatureHolder currentNewSh = (SignatureHolder)newList.get(i);
-
- boolean shAlreadyPresentInOldList = false;
- int pos = -1;
-
- for(int j=0; j<oldList.size(); j++) {
-
- SignatureHolder currentOldSh = (SignatureHolder)oldList.get(j);
-
- if(currentNewSh.getSignatureObject().getSignationValue().equals(currentOldSh.getSignatureObject().getSignationValue())) {
-
- shAlreadyPresentInOldList = true;
- pos = j;
- }
- }
-
- if(!shAlreadyPresentInOldList) {
-
- // signature holder has not been found earlier -> add
- result.add(currentNewSh);
- }
-
- }
-
-
- return;
- }
-
-
- protected List flattenOutTextPartitions (List partitions, List blocks)
- {
-
- List blockPartitions = new ArrayList(blocks.size());
- Iterator it = partitions.iterator();
- while (it.hasNext())
- {
- Partition p = (Partition)it.next();
- if (p instanceof TextPartition)
- {
- TextPartition tp = (TextPartition)p;
- Iterator blockIt = tp.blocks.iterator();
- while (blockIt.hasNext())
- {
- FooterParseResult fpr = (FooterParseResult)blockIt.next();
- TextPartition newPt = new TextPartition();
- newPt.blocks = new ArrayList(1);
- newPt.blocks.add(fpr);
- blockPartitions.add(newPt);
- }
- }
- else
- {
- // binary partition
- blockPartitions.add(p);
- }
- }
-
- // note: successive binary blocks are still combined to one binary partition
- assert blockPartitions.size() <= blocks.size();
-
- return blockPartitions;
- }
-
- protected String extractText(PdfDataSource pdf, int endOfDocument) throws PresentableException {
- return extractText(pdf, endOfDocument, "utf8");
- }
-
- protected String extractText(PdfDataSource pdf, int endOfDocument, String encoding) throws PresentableException
- {
-
- log.debug("EXTRACTING TEXT (" + encoding + ")... end index = " + endOfDocument);
-
- DelimitedPdfDataSource dds = new DelimitedPdfDataSource(pdf, endOfDocument);
- //DelimitedInputStream dis = new DelimitedInputStream(pdf.createInputStream(), endOfDocument);
- return PdfAS.extractNormalizedTextTextual(dds, encoding);
- }
-
-
- protected List extractNewSignaturesFromText(String text) throws VerificationFilterException
- {
- try
- {
- return AbsoluteTextSignature.extractSignatureHoldersFromText(text);
- }
- catch (PresentableException e)
- {
- throw new VerificationFilterException(e);
- }
- }
-
- protected List extractNewAndOldSignaturesFromText(String text) throws VerificationFilterException
- {
- SignaturesAndOld sao = extractSignaturesAndOld(text);
- if (sao.oldSignature != null)
- {
- sao.newSignatures.add(0, sao.oldSignature);
- }
-
- return sao.newSignatures;
- }
-
- protected List extractOldSignaturesFromText(String text) throws PresentableException
- {
- return PdfAS.extractSignatureHoldersTextual(text, true);
- }
-
- protected List intermingleSignatures(List binarySignatures, List extractedSignatures)
- {
- List textualSignatures = filterOutBinarySignatures(extractedSignatures);
-
- List intermingled = new ArrayList(binarySignatures.size() + textualSignatures.size());
- intermingled.addAll(binarySignatures);
- intermingled.addAll(textualSignatures);
-
- sortSignatures(intermingled);
-
- return intermingled;
- }
-
- protected List filterOutBinarySignatures(List signatures)
- {
- List textOnly = new ArrayList(signatures.size());
-
- Iterator it = signatures.iterator();
- while (it.hasNext())
- {
- SignatureHolder sh = (SignatureHolder) it.next();
- if (sh.getSignatureObject().isTextual())
- {
- textOnly.add(sh);
- }
- }
-
- return textOnly;
- }
-
- protected void sortSignatures(List signatures)
- {
- SignatureHolderHelper.sortByDate(signatures);
- }
-
- protected void debugIUBlocks(List blocks)
- {
- Iterator it = blocks.iterator();
- while (it.hasNext())
- {
- FooterParseResult fpr = (FooterParseResult) it.next();
- log.debug("footer: " + fpr.start_index + " to " + fpr.next_index + ", has predecessor = " + fpr.tpr.has_predecessor);
- }
- }
-
- protected void debugPartitions(List partitions)
- {
- Iterator it = partitions.iterator();
- while (it.hasNext())
- {
- Object o = it.next();
- assert o instanceof Partition;
-
- List blocks = null;
- if (o instanceof TextPartition)
- {
- TextPartition tp = (TextPartition) o;
-
- blocks = tp.blocks;
-
- log.debug("text partition with " + tp.blocks.size() + " blocks:");
- }
- else
- {
- BinaryPartition bp = (BinaryPartition) o;
-
- blocks = bp.blocks;
-
- log.debug("binary partition: with " + bp.blocks.size() + " blocks:");
-
- }
- debugIUBlocks(blocks);
- log.debug("partition finished.");
- }
- }
-
- /**
- * Extracts the binary singatures from the given PDF.
- *
- * <p>
- * IU blocks without an egiz dict are not considered.
- * </p>
- *
- * @param pdf
- * @param blocks
- * @return Returns the List of signature holders.
- * @throws PresentableException
- */
- protected List extractBinarySignaturesOnly(PdfDataSource pdf, List blocks) throws VerificationFilterException
- {
- SettingsReader settings;
- try {
- settings = SettingsReader.getInstance();
- } catch (SettingsException e) {
- throw new VerificationFilterException(e);
- }
- String check_doc = settings.getSetting(CHECK_DOCUMENT, "false");
- String binary_only = settings.getSetting(BINARY_ONLY, "false");
- String assume_sigs_only = settings.getSetting(ASSUME_ONLY_SIGNATURE_BLOCKS, "false");
- boolean supressException = "true".equalsIgnoreCase(settings.getSetting(SUPRESS_EXCEPTION_WHEN_LAST_UIBLOCK_IS_NO_SIGNATURE, "false"));
-
- try
- {
- // PERF: extract binary signatures needs byte array
- byte[] data = DataSourceHelper.convertDataSourceToByteArray(pdf);
-
- List binarySignatures = new ArrayList(blocks.size());
-
- Iterator it = blocks.iterator();
- int prev_end = 0;
- boolean sig_detected = false;
- while (it.hasNext())
- {
- FooterParseResult fpr = (FooterParseResult) it.next();
- assert fpr.next_index > prev_end;
-
- if (VerificationFilterBinaryHelper.containsEGIZDict(data, fpr))
- {
- PdfASID kz = VerificationFilterBinaryHelper.extractKZFromEGIZBlock(data, fpr);
-
- // TODO dferbas hack baik test
- //kz = new PdfASID("urn:pdfsigfilter:bka.gv.at:binaer:v1.1.0");
-
- Verificator verificator = VerificatorFactory.createBinaryVerificator(kz);
- List binary_holders = verificator.parseBlock(pdf, data, fpr, prev_end);
-
- binarySignatures.addAll(binary_holders);
- if(binary_holders.size() > 0) {
- sig_detected = true;
- }
- } else {
- // an Exception is thrown here if:
- // 1) check_document is activated
- // 2) assume_only_signature_blocks is false - otherwise we permit updates
- // 3) binary_only is true - otherwise updates are handled in method performFullConservative().
- // when binary-only is true, we can be sure that a block that contains no egiz-dict is no textual
- // signature either but an illegal update, otherwise an Exception (doc contains textual sig) would have been thrown before
- // 4) a binary signature has been detected in a previous block
- if(check_doc.equalsIgnoreCase("true") &&
- binary_only.equalsIgnoreCase("true") &&
- assume_sigs_only.equalsIgnoreCase("false") &&
- sig_detected) {
-
- if (!supressException) {
- throw new VerificationFilterException(ErrorCode.MODIFIED_AFTER_SIGNATION, "The document has been modified after being signed.");
- } else {
- log.debug("The document has been modified after being signed. According to the configuration, no exception is thrown.");
- }
-
- }
- }
-
- prev_end = fpr.next_index;
- }
-
- return binarySignatures;
- }
- catch (PresentableException e)
- {
- throw new VerificationFilterException(e);
- }
- }
-
- protected List extractSignatures(PdfDataSource pdf, int endOfDocument) throws VerificationFilterException
- {
- try
- {
- log.debug("Extracting text from 0 to " + endOfDocument + " (total document size = " + pdf.getLength() + "):");
- String extractedText = extractText(pdf, endOfDocument);
- log.debug("Extracting text finished.");
- log.debug("extracted text: " + extractedText);
-
- log.debug("Extracting signatures:");
- List extractedSignatures = extractNewSignaturesFromText(extractedText);
- log.debug("Extracting signatures finished.");
- log.debug("Number of found signatures: " + extractedSignatures.size());
-
- if (extractedSignatures.size() > 0) {
- List cp1252SignaturesPositions = new ArrayList();
- //boolean iscp1252Sig = false;
- for (int i = 0; i < extractedSignatures.size(); i++) {
- SignatureHolder sh = (SignatureHolder)extractedSignatures.get(i);
- PdfASID kzid = sh.getSignatureObject().getKZ();
- if (kzid != null && kzid.isOldCp1252Version()) {
- log.debug("found cp1252 signature");
- cp1252SignaturesPositions.add(new Integer(i));
- //iscp1252Sig = true;
- //break;
- }
- }
- if (cp1252SignaturesPositions.size() > 0) {
- log.debug("redo text and signature extraction with cp1252 encoding");
- extractedText = extractText(pdf, endOfDocument, "cp1252");
- log.debug("Extracting text finished.");
-
- log.debug("Extracting signatures:");
- List cp1252ExtractedSignatures = extractNewSignaturesFromText(extractedText);
- log.debug("Extracting signatures finished.");
- log.debug("Number of found signatures: " + extractedSignatures.size());
-
- if (cp1252ExtractedSignatures.size() != extractedSignatures.size()) {
- log.error("Invalid cp1252 signatures found. Skipping cp1252 compatibility.");
- }
- // merge signature holders
- for (int i = 0; i < cp1252SignaturesPositions.size(); i++) {
- int replaceIndex = ((Integer)cp1252SignaturesPositions.get(i)).intValue();
- extractedSignatures.remove(replaceIndex);
- extractedSignatures.add(replaceIndex, cp1252ExtractedSignatures.get(replaceIndex));
- }
- }
-
- }
-
- if (log.isDebugEnabled())
- {
- log.debug("extracted signatures:");
- for (int i = 0; i < extractedSignatures.size(); i++)
- {
- SignatureHolder sh = (SignatureHolder)extractedSignatures.get(i);
- String dateStr = sh.getSignatureObject().getSignationDate();
- EGIZDate ed = EGIZDate.parseFromString(dateStr);
- log.debug("#" + i + ": dateStr = " + dateStr + ", egizDate = " + ed.toString());
- }
- }
-
- return extractedSignatures;
- }
- catch (PresentableException e)
- {
- throw new VerificationFilterException(e);
- }
- }
-
- protected String determineRestText(List newSignatures, String extractedText)
- {
- if (newSignatures.isEmpty())
- {
- return extractedText;
- }
-
- // note that even if the oldest signature is a binary signature,
- // the rest text is the text of this binary signature, which was extracted
- // like a text signature.
- TextualSignatureHolder oldestSignature = (TextualSignatureHolder) newSignatures.get(0);
- return oldestSignature.getSignedText();
- }
-
- protected List extractSignaturesFromPartition(PdfDataSource pdf, Partition partition) throws VerificationFilterException
- {
- assert partition.isTextPartition();
-
- int endOfDocument = VerificationFilterHelper.getEndOfPartition(partition);
- List extractedSigs = extractSignatures(pdf, endOfDocument);
- TextualSignatureHolder.mulitSetUiBlockEndPos(extractedSigs, endOfDocument);
- return extractedSigs;
- }
-
- protected SignaturesAndOld extractSignaturesFromPartitionAndOld(PdfDataSource pdf, Partition partition) throws VerificationFilterException
- {
- assert partition.isTextPartition();
-
- try
- {
- int endOfDocument = VerificationFilterHelper.getEndOfPartition(partition);
-
-// log.debug("Extracting text from 0 to " + endOfDocument + " (total document size = " + pdf.getLength() + "):");
- String extractedText = extractText(pdf, endOfDocument);
-// log.debug("Extracting text finished.");
-// log.debug("extracted text: " + extractedText);
-
- SignaturesAndOld sao = extractSignaturesAndOld(extractedText);
- TextualSignatureHolder.trySetUiBlockEndPos(sao.oldSignature, endOfDocument);
- TextualSignatureHolder.mulitSetUiBlockEndPos(sao.newSignatures, endOfDocument);
-
- return sao;
- }
- catch (PresentableException e)
- {
- throw new VerificationFilterException(e);
- }
- }
-
- protected void checkBinaryOnly(PdfDataSource pdf, boolean considerOldSigs) throws VerificationFilterException {
-
- DelimitedPdfDataSource dds = new DelimitedPdfDataSource(pdf, pdf.getLength());
- String text = null;
- try {
- text = PdfAS.extractNormalizedTextTextual(dds, "utf-8");
- } catch (PresentableException e) {
- throw new VerificationFilterException(e);
- }
-
- List sigs = new ArrayList();
-
- if(considerOldSigs) {
- SignaturesAndOld sao = extractSignaturesAndOld(text);
- if(sao != null) {
- if(sao.newSignatures != null) {
- sigs.addAll(sao.newSignatures);
- }
- if(sao.oldSignature != null) {
- sigs.add(sao.oldSignature);
- }
- }
- } else {
- List signatures = extractSignatures(pdf, pdf.getLength());
- if(signatures != null) {
- sigs.addAll(signatures);
- }
- }
-
- Iterator it = sigs.iterator();
- while(it.hasNext()) {
- SignatureHolder current = (SignatureHolder)it.next();
- if((current != null)&&(!current.getSignatureObject().isBinary())) {
- throw new VerificationFilterException(ErrorCode.NON_BINARY_SIGNATURES_PRESENT, "The document contains non-binary signatures.");
- }
- }
- }
-
-
- protected static class SignaturesAndOld
- {
- public List newSignatures = null;
-
- public SignatureHolder oldSignature = null;
- }
-
- protected SignaturesAndOld extractSignaturesAndOld(String text) throws VerificationFilterException
- {
- try
- {
- log.debug("Extracting signatures:");
- List extractedSignatures = extractNewSignaturesFromText(text);
- log.debug("Extracting signatures finished.");
-
- log.debug("Extracting old signatures:");
- SignatureHolder oldSignature = extractOldSignature(text, extractedSignatures);
- log.debug("Extracting old signatures finished.");
- log.debug("oldSignature = null: " + (oldSignature==null));
-
- SignaturesAndOld sao = new SignaturesAndOld();
- sao.newSignatures = extractedSignatures;
- sao.oldSignature = oldSignature;
-
- return sao;
- }
- catch (PresentableException e)
- {
- throw new VerificationFilterException(e);
- }
- }
-
- /**
- * Extracts the old signature from the text, but only if it is older than the
- * oldest signature of the new signatueres.
- *
- * @param extractedText
- * @param newSignatures
- * @return
- * @throws PDFDocumentException
- * @throws SignatureException
- * @throws NormalizeException
- * @throws SignatureTypesException
- */
- protected SignatureHolder extractOldSignature(String extractedText, List newSignatures) throws PDFDocumentException, SignatureException, NormalizeException, SignatureTypesException
- {
- SignatureHolder oldSignature = null;
-
- String restText = determineRestText(newSignatures, extractedText);
-
- List oldSignatures = PdfAS.extractSignatureHoldersTextual(restText, true);
- if (!oldSignatures.isEmpty())
- {
- oldSignature = (SignatureHolder) oldSignatures.get(0);
- if (!newSignatures.isEmpty())
- {
- SignatureHolder oldestNewSignature = (SignatureHolder) newSignatures.get(0);
- EGIZDate oldDate = EGIZDate.parseFromString(oldSignature.getSignatureObject().getSignationDate());
- EGIZDate newDate = EGIZDate.parseFromString(oldestNewSignature.getSignatureObject().getSignationDate());
- if (newDate.compareTo(oldDate) <= 0)
- {
- oldSignature = null;
- }
- }
- }
- return oldSignature;
- }
-}
|