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ICEpdf PDF Viewer Reference Implementation (RI)
/*
* Copyright 2006-2017 ICEsoft Technologies Canada Corp.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the
* License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an "AS
* IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
* express or implied. See the License for the specific language
* governing permissions and limitations under the License.
*/
package org.icepdf.ri.common.utility.signatures;
import org.icepdf.core.pobjects.Document;
import org.icepdf.core.pobjects.acroform.InteractiveForm;
import org.icepdf.core.pobjects.acroform.SignatureDictionary;
import org.icepdf.core.pobjects.acroform.signature.exceptions.SignatureIntegrityException;
import org.icepdf.core.pobjects.annotations.SignatureWidgetAnnotation;
import org.icepdf.ri.common.SwingController;
import org.icepdf.ri.common.SwingWorker;
import javax.swing.*;
import java.awt.*;
import java.text.MessageFormat;
import java.util.ArrayList;
import java.util.ResourceBundle;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
* This class is a utility for verifying signature annotations off the AWT thread. The are two main sub classes
* VerifyAllSignatures and VerifySignature. The RI uses both of these methods for validating all signatures and
* refreshing an individual signature annotation state.
*/
public class SigVerificationTask {
private static final Logger logger =
Logger.getLogger(SigVerificationTask.class.toString());
// total number of signatures to process.
private int lengthOfTask;
// current progress, used for the progress bar
private int current = 0;
// message displayed on progress bar
private String dialogMessage;
// flags for threading
private boolean done = false;
private boolean canceled = false;
// parent swing controller
SwingController controller;
// append nodes for found text.
private SignaturesPanel signaturesPanel;
// message bundle for internationalization
private ResourceBundle messageBundle;
private boolean currentlyVerifying;
private Container viewContainer;
/**
* Creates a new instance of the SigVerificationTask.
*
* @param signaturesPanel parent signature panel that start this task via an action
* @param controller root controller object
* @param messageBundle message bundle used for dialog text.
*/
public SigVerificationTask(SignaturesPanel signaturesPanel,
SwingController controller,
ResourceBundle messageBundle) {
this.controller = controller;
this.signaturesPanel = signaturesPanel;
lengthOfTask = controller.getDocument().getCatalog().getInteractiveForm().getSignatureFields().size();
this.messageBundle = messageBundle;
this.viewContainer = controller.getDocumentViewController().getViewContainer();
}
/**
* Start the task, start verifying all the signatures annotations.
*/
public void verifyAllSignatures() {
final SwingWorker worker = new SwingWorker() {
public Object construct() {
current = 0;
done = false;
canceled = false;
dialogMessage = null;
return new VerifyAllSignatures();
}
};
worker.setThreadPriority(Thread.NORM_PRIORITY);
worker.start();
}
/**
* Start the task, verify the specified signature annotation.
*/
public void verifySignature(final SignatureWidgetAnnotation signatureWidgetAnnotation,
final SignatureTreeNode signatureTreeNode) {
final SwingWorker worker = new SwingWorker() {
public Object construct() {
current = 0;
done = false;
canceled = false;
dialogMessage = null;
return new VerifySignature(signatureWidgetAnnotation, signatureTreeNode);
}
};
worker.setThreadPriority(Thread.NORM_PRIORITY);
worker.start();
}
/**
* Number of signatures that has tobe validated.
*
* @return returns max number of signatures that need validation.
*/
public int getLengthOfTask() {
return lengthOfTask;
}
/**
* Gets the signature number that is currently being validated by this task.
*
* @return current page being processed.
*/
public int getCurrent() {
return current;
}
/**
* Stop the task.
*/
public void stop() {
canceled = true;
dialogMessage = null;
}
/**
* Find out if the task has completed.
*
* @return true if task is done, false otherwise.
*/
public boolean isDone() {
return done;
}
public boolean isCurrentlyVerifying() {
return currentlyVerifying;
}
/**
* Returns the most recent dialog message, or null
* if there is no current dialog message.
*
* @return current message dialog text.
*/
public String getMessage() {
return dialogMessage;
}
/**
* Verify all signatures defined by the parent task.
*/
class VerifyAllSignatures {
VerifyAllSignatures() {
currentlyVerifying = true;
MessageFormat messageFormat = new MessageFormat(
messageBundle.getString("viewer.utilityPane.signatures.verify.initializingMessage.label"));
try {
current = 0;
try {
Document document = controller.getDocument();
InteractiveForm interactiveForm = document.getCatalog().getInteractiveForm();
// checks and flags each annotation to indicate if the signatures cover the whole document
interactiveForm.isSignaturesCoverDocumentLength();
final ArrayList signatures = interactiveForm.getSignatureFields();
boolean unsignedFields = false;
// build out the tree
if (signatures.size() > 0) {
// iterate over the signature in the document.
for (int i = 0, max = signatures.size(); i < max; i++) {
// break if needed
if (canceled || done) {
break;
}
// Update task information
current = i;
dialogMessage = messageFormat.format(new Object[]{i + 1, signatures.size()});
final SignatureWidgetAnnotation signatureWidgetAnnotation = signatures.get(i);
SignatureDictionary signatureDictionary = signatureWidgetAnnotation.getSignatureDictionary();
if (signatureDictionary.getEntries().size() > 0) {
try {
signatureWidgetAnnotation.getSignatureValidator().validate();
signatureWidgetAnnotation.getSignatureValidator().isSignaturesCoverDocumentLength();
// add a new node to the tree.
} catch (SignatureIntegrityException e) {
logger.log(Level.WARNING, "Error verifying signature.", e);
}
// add the node to the signature panel tree but on the
// awt thread.
SwingUtilities.invokeLater(new Runnable() {
public void run() {
// add the node
signaturesPanel.addSignature(signatureWidgetAnnotation);
// try repainting the container
viewContainer.repaint();
}
});
} else {
// found some unsigned fields.
unsignedFields = true;
}
Thread.yield();
}
// build out unsigned fields
if (unsignedFields) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
signaturesPanel.addUnsignedSignatures(signatures);
viewContainer.repaint();
}
});
}
}
// update the dialog and end the task
dialogMessage = messageBundle.getString("viewer.utilityPane.signatures.verify.completeMessage.label");
done = true;
} catch (Exception e) {
logger.log(Level.FINER, "Error verifying signatures.", e);
}
} finally {
currentlyVerifying = false;
}
// repaint the view container
SwingUtilities.invokeLater(new Runnable() {
public void run() {
viewContainer.validate();
}
});
}
}
/**
* Verify the signature specified in the constructor.
*/
class VerifySignature {
/**
* Verifies the given signature and update the respective tree node.
*
* @param signatureWidgetAnnotation annotation to verify
* @param signatureTreeNode node to update for display of new validation info.
*/
VerifySignature(final SignatureWidgetAnnotation signatureWidgetAnnotation,
final SignatureTreeNode signatureTreeNode) {
try {
currentlyVerifying = true;
current = 0;
try {
dialogMessage = messageBundle.getString("viewer.utilityPane.signatures.verify.validating.label");
signaturesPanel.updateSignature(signatureWidgetAnnotation, signatureTreeNode);
// add the node to the signature panel tree but on the
// awt thread.
SwingUtilities.invokeLater(new Runnable() {
public void run() {
// add the node
signaturesPanel.showSignatureValidationDialog(signatureWidgetAnnotation);
// try repainting the container
viewContainer.repaint();
}
});
// update the dialog and end the task
dialogMessage = messageBundle.getString("viewer.utilityPane.signatures.verify.completeMessage.label");
done = true;
} catch (Exception e) {
logger.log(Level.FINER, "Error verifying signature.", e);
}
} finally {
currentlyVerifying = false;
}
// repaint the view container
SwingUtilities.invokeLater(new Runnable() {
public void run() {
viewContainer.validate();
}
});
}
}
}
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