src/main/java/net/sf/taverna/t2/workbench/ui/credentialmanager/NewKeyPairEntryDialog.java - incubator-taverna-workbench - Git at Google

 /*******************************************************************************
  * Copyright (C) 2007 The University of Manchester
  *
  *  Modifications to the initial code base are copyright of their
  *  respective authors, or their employers as appropriate.
  *
  *  This program 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 program 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 program; if not, write to the Free Software
  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  ******************************************************************************/
 package net.sf.taverna.t2.workbench.ui.credentialmanager;

 import java.awt.BorderLayout;
 import java.awt.FlowLayout;
 import java.awt.Font;
 import java.awt.event.ActionEvent;
 import java.awt.event.ActionListener;
 import java.awt.event.WindowAdapter;
 import java.awt.event.WindowEvent;
 import java.security.GeneralSecurityException;
 import java.security.Key;
 import java.security.KeyStore;
 import java.security.cert.Certificate;
 import java.security.cert.X509Certificate;
 import java.util.ArrayList;
 import java.util.Enumeration;
 import java.util.HashMap;
 import java.util.Set;
 import java.util.Iterator;

 import javax.swing.JButton;
 import javax.swing.JDialog;
 import javax.swing.JFrame;
 import javax.swing.JLabel;
 import javax.swing.JList;
 import javax.swing.DefaultListModel;
 import javax.swing.JOptionPane;
 import javax.swing.JPanel;
 import javax.swing.JScrollPane;
 import javax.swing.BoxLayout;
 import javax.swing.ListSelectionModel;
 import javax.swing.border.CompoundBorder;
 import javax.swing.border.EmptyBorder;
 import javax.swing.border.EtchedBorder;
 import javax.swing.event.ListSelectionEvent;
 import javax.swing.event.ListSelectionListener;

 import net.sf.taverna.t2.security.credentialmanager.CMException;
 import net.sf.taverna.t2.security.credentialmanager.CMX509Util;
 import net.sf.taverna.t2.security.credentialmanager.CredentialManager;
 import net.sf.taverna.t2.workbench.ui.credentialmanager.GetServiceURLDialog;
 import net.sf.taverna.t2.workbench.ui.credentialmanager.ViewCertDetailsDialog;

 /**
  * Dialog that displays the details of all key pairs from a PKCS #12
  * keystore allowing the user to pick one for import.
  *
  * @author Alex Nenadic
  */
 @SuppressWarnings("serial")
 class NewKeyPairEntryDialog extends JDialog
 {
 	// List of key pairs available for import
     private JList jltKeyPairs;

     // Service URL text field for user to enter
     private JList jltServiceURLs;

     // Service URL (associated with the key pair)
     private ArrayList<String> serviceURLs;

     // PKCS #12 keystore */
     private KeyStore pkcs12KeyStore;

     // Private key part of key pair chosen by the user for import
     private Key privateKey;

     // Certificate chain part of key pair chosen by the user for import
     private Certificate[] certificateChain;

     // Key pair alias to be used for this entry in the Keystore
     private String alias;

     /**
      * Creates new form NewKeyPairEntryDialog where the parent is a frame.
      */
     public NewKeyPairEntryDialog(JFrame parent, String title, boolean modal, KeyStore pkcs12KS)
         throws CMException
     {
         super(parent, title, modal);
         pkcs12KeyStore = pkcs12KS;
         initComponents();
     }

     /**
      * Creates new form NewKeyPairEntryDialog where the parent is a dialog.
      */
     public NewKeyPairEntryDialog(JDialog parent, String title, boolean modal, KeyStore pkcs12KS)
         throws CMException
     {
         super(parent, title, modal);
         pkcs12KeyStore = pkcs12KS;
         initComponents();
     }

     /**
      * Get the private part of the key pair chosen by the user for import.
      *
      * @return The private key or null if the user has not chosen a key pair
      */
     public Key getPrivateKey()
     {
         return privateKey;
     }

     /**
      * Get the certificate chain part of the key pair chosen by the
      * user for import.
      *
      * @return The certificate chain or null if the user has not
      * chosen a key pair
      */
     public Certificate[] getCertificateChain()
     {
         return certificateChain;
     }

     /**
      * Get the alias of the key pair chosen by the user for import.
      *
      * @return the alias
      */
     public String getAlias()
     {
         return alias;
     }

     /**
      * Get the service URLs entered by the user.
      *
      * @return list of service URLs
      */
     public ArrayList<String> getServiceURLs()
     {
         return serviceURLs;
     }

     /**
      * Initialise the dialog's GUI components.
      *
      * @throws CMException A problem was encountered importing a key pair
      */
     private void initComponents()
         throws CMException
     {
         // Instructions
         JLabel jlInstructions = new JLabel("Select a key pair for import:");
         jlInstructions.setFont(new Font(null, Font.PLAIN, 11));
         jlInstructions.setBorder(new EmptyBorder(5,5,5,5));
         JPanel jpInstructions = new JPanel(new BorderLayout());
         jpInstructions.add(jlInstructions, BorderLayout.WEST);

         // Import button
         final JButton jbImport = new JButton("Import");
         jbImport.setEnabled(false);
         jbImport.addActionListener(new ActionListener()
         {
             public void actionPerformed(ActionEvent evt)
             {
                 importPressed();
             }
         });

         // Certificate details button
         final JButton jbCertificateDetails = new JButton("Certificate Details");
         jbCertificateDetails.setEnabled(false);
         jbCertificateDetails.addActionListener(new ActionListener()
         {
             public void actionPerformed(ActionEvent evt)
             {
                 certificateDetailsPressed();
             }
         });

         // List to hold keystore's key pairs
         jltKeyPairs = new JList();
         jltKeyPairs.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
         jltKeyPairs.addListSelectionListener(new ListSelectionListener()
         {
             public void valueChanged(ListSelectionEvent evt)
             {
                 if (jltKeyPairs.getSelectedIndex() == -1) {
                     jbImport.setEnabled(false);
                     jbCertificateDetails.setEnabled(false);
                 }
                 else {
                     jbImport.setEnabled(true);
                     jbCertificateDetails.setEnabled(true);
                 }
             }
         });

         // Put the key list into a scroll pane
         JScrollPane jspKeyPairs = new JScrollPane(jltKeyPairs,
             JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED,
             JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);
         jspKeyPairs.getViewport().setBackground(jltKeyPairs.getBackground());

         // Service URLs list
         // Label
         JLabel jlServiceURL = new JLabel ("Service URLs the key pair will be used for:");
         jlServiceURL.setFont(new Font(null, Font.PLAIN, 11));
         jlServiceURL.setBorder(new EmptyBorder(5,5,5,5));
         // New empty service URLs list
         DefaultListModel jltModel = new DefaultListModel();
         jltServiceURLs = new JList(jltModel);
         // 'Add' service URL button
         JButton addButton = new JButton("Add");
         addButton.addActionListener(new ActionListener(){
             public void actionPerformed(ActionEvent evt)
             {
             	addServiceURLPressed();
             }
         });
         addButton.setEnabled(true);
         // 'Remove' service URL button
         final JButton removeButton = new JButton("Remove");
         removeButton.addActionListener(new ActionListener(){
             public void actionPerformed(ActionEvent evt)
             {
             	// get selected indices
             	int[] selected = jltServiceURLs.getSelectedIndices();
             	for (int i = selected.length -1; i>=0 ; i--){
             		 ((DefaultListModel) jltServiceURLs.getModel()).remove(selected[i]);
             	}
             }
         });
         removeButton.setEnabled(false);
         jltServiceURLs.addListSelectionListener(new ListSelectionListener()
         {
             public void valueChanged(ListSelectionEvent evt)
             {
                 if (jltServiceURLs.getSelectedIndex() == -1) {
                 	removeButton.setEnabled(false);
                 }
                 else {
                 	removeButton.setEnabled(true);
                 }
             }
         });
         // Scroll pane for service URLs list
         JScrollPane jspServiceURLs = new JScrollPane(jltServiceURLs,
                 JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED,
                 JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);
         jspServiceURLs.getViewport().setBackground(jltServiceURLs.getBackground());

         // Panel for Add and Remove buttons
         JPanel jpServiceURLsButtons = new JPanel(new FlowLayout(FlowLayout.CENTER));
         jpServiceURLsButtons.add(addButton);
         jpServiceURLsButtons.add(removeButton);

         // Panel to hold the list scroll pane and Add/Remove buttons panel
         JPanel jpServiceURLs = new JPanel(new BorderLayout());
         jpServiceURLs.add(jlServiceURL, BorderLayout.NORTH);
         jpServiceURLs.add(jspServiceURLs, BorderLayout.CENTER);
         jpServiceURLs.add(jpServiceURLsButtons, BorderLayout.SOUTH);

         // Put all the key pair components together
         JPanel jpKeyPairs = new JPanel(); // BoxLayout
         jpKeyPairs.setLayout(new BoxLayout(jpKeyPairs, BoxLayout.Y_AXIS));
         //jpKeyPairs.setPreferredSize(new Dimension(400, 200));
         jpKeyPairs.setBorder(new CompoundBorder(new CompoundBorder(
             new EmptyBorder(5, 5, 5, 5), new EtchedBorder()), new EmptyBorder(
             5, 5, 5, 5)));

         jpInstructions.setAlignmentY(JPanel.LEFT_ALIGNMENT);
         jpKeyPairs.add(jpInstructions);
         jspKeyPairs.setAlignmentY(JPanel.LEFT_ALIGNMENT);
         jpKeyPairs.add(jspKeyPairs);
         jbCertificateDetails.setAlignmentY(JPanel.RIGHT_ALIGNMENT);
         jpKeyPairs.add(jbCertificateDetails);
         jpServiceURLs.setAlignmentY(JPanel.LEFT_ALIGNMENT);
         jpKeyPairs.add(jpServiceURLs);

         // Cancel button
         final JButton jbCancel = new JButton("Cancel");
         jbCancel.addActionListener(new ActionListener()
         {
             public void actionPerformed(ActionEvent evt)
             {
                 cancelPressed();
             }
         });

         JPanel jpButtons = new JPanel(new FlowLayout(FlowLayout.CENTER));
         jpButtons.add(jbImport);
         jpButtons.add(jbCancel);

         getContentPane().setLayout(new BorderLayout());
         getContentPane().add(jpKeyPairs, BorderLayout.CENTER);
         getContentPane().add(jpButtons, BorderLayout.SOUTH);

         // Populate the list
         populateList();

         addWindowListener(new WindowAdapter()
         {
             public void windowClosing(WindowEvent evt)
             {
                 closeDialog();
             }
         });

         setResizable(false);

         getRootPane().setDefaultButton(jbImport);

         pack();

     }

     /**
      * Populate the key pair list with the PKCS #12 keystore's key
      * pair aliases.
      *
      * @throws CMException Problem accessing the keystore's entries
      */
     private void populateList()
         throws CMException
     {
         try {
         	ArrayList<String> vKeyPairAliases = new ArrayList<String>();

             // For each entry in the keystore...
             for (Enumeration<String> aliases = pkcs12KeyStore.aliases(); aliases.hasMoreElements();)
             {
                 // Get alias
                 String sAlias = (String) aliases.nextElement();

                 // Add the alias to the list if the entry has a key
                 // and certificates
                 if (pkcs12KeyStore.isKeyEntry(sAlias)) {
                 	pkcs12KeyStore.getKey(sAlias, new char[] {});
                     Certificate[] certs = pkcs12KeyStore.getCertificateChain(sAlias);

                     if (certs != null && certs.length != 0) {
                         vKeyPairAliases.add(sAlias);
                     }
                 }
             }

             if (vKeyPairAliases.size() > 0) {
                 jltKeyPairs.setListData(vKeyPairAliases.toArray());
                 jltKeyPairs.setSelectedIndex(0);
             }
             else {
                 // No key pairs available...
                 jltKeyPairs.setListData(new String[] { "-- No key pairs present in the Credential Store --" });
                 jltKeyPairs.setEnabled(false);
             }
         }
         catch (GeneralSecurityException ex) {
             throw new CMException("Problem occured while accessing PKCS #12 keystore's entries.",
                 ex);
         }
     }

     /**
      * 'Certificate Details' button pressed. Display the selected key
      * pair's certificate.
      */
     private void certificateDetailsPressed()
     {
         try {

         	String sAlias = (String) jltKeyPairs.getSelectedValue();

             assert sAlias != null;

             //Convert the certificate object into an X509Certificate object.
              X509Certificate cert = CMX509Util.convertCertificate(pkcs12KeyStore.getCertificate(sAlias));

             // Supply the certificate to the view certificate dialog
             ViewCertDetailsDialog viewCertificateDialog = new ViewCertDetailsDialog(this,
             		"Certificate details",
             		true,
             		(X509Certificate) cert,
             		null);
             viewCertificateDialog.setLocationRelativeTo(this);
             viewCertificateDialog.setVisible(true);

         }
         catch (Exception ex) {

             JOptionPane.showMessageDialog(this,
                     "Failed to obtain certificate details to show.",
                     "Credential Manager Alert",
                     JOptionPane.WARNING_MESSAGE);
             closeDialog();
         }
     }


     /**
      * Import button pressed by user. Store the selected key pair's
      * private and public parts and service URLs and close the dialog.
      */
     public void importPressed()
     {
     	// Get Service URLs
     	serviceURLs = new ArrayList<String>();
     	Enumeration<?> URLs = (((DefaultListModel) jltServiceURLs.getModel()).elements());
     	 for( ; URLs.hasMoreElements(); ){
     		 serviceURLs.add((String) URLs.nextElement());
     	 }

         String sAlias = (String) jltKeyPairs.getSelectedValue();

         assert sAlias != null;

         try {
             privateKey = pkcs12KeyStore.getKey(sAlias, new char[] {});
             certificateChain = pkcs12KeyStore.getCertificateChain(sAlias);
             alias = sAlias;
         }
         catch (Exception ex) {
             JOptionPane.showMessageDialog(this,
                     "Failed to load the private key and certificate chain from PKCS #12 file.",
                     "Credential Manager Error",
                     JOptionPane.ERROR_MESSAGE);
             closeDialog();
         }

         closeDialog();
     }

     /**
      * Add Service URL button pressed.
      */
     public void addServiceURLPressed(){

     	// Display the dialog for entering service URL
     	GetServiceURLDialog dGetServiceURL = new GetServiceURLDialog(this, true);

     	dGetServiceURL.setLocationRelativeTo(this);
     	dGetServiceURL.setVisible(true);

         String sURL = dGetServiceURL.getServiceURL();

         if (sURL == null){ // user cancelled
         	return;
         }

         if (sURL.length() == 0){ // user entered an empty URL
        		// Warn the user
         	JOptionPane.showMessageDialog(
             		this,
             		"Service URL cannot be empty",
         			"Credential Manager Alert",
         			JOptionPane.INFORMATION_MESSAGE);
         	return;
         }

     	// Check if the entered URL already exist in the URL list for this key entry
     	if (((DefaultListModel) jltServiceURLs.getModel()).contains(sURL)){

     		// Warn the user
         	JOptionPane.showMessageDialog(
             		this,
             		"The entered URL already exists in the list of URLs for this key pair entry",
         			"Credential Manager Alert",
         			JOptionPane.INFORMATION_MESSAGE);
         	return;
     	}

 		// Check if the entered URL is already associated with another key pair entry in the Keystore
     	CredentialManager credManager = null;
 		try {
 			credManager = CredentialManager.getInstance();
 		} catch (CMException cme) {
 			// Failed to instantiate Credential Manager - warn the user and exit
 			String sMessage = "Failed to instantiate Credential Manager. " + cme.getMessage();
 			cme.printStackTrace();
 			JOptionPane.showMessageDialog(new JFrame(), sMessage,
 					"Credential Manager Error", JOptionPane.ERROR_MESSAGE);
 			return;
 		}
     	// Get the lists of URLs for the alias
     	HashMap<String, ArrayList<String>> serviceURLsMap = credManager.getServiceURLsforKeyPairs();
     	if (serviceURLsMap != null){ // should not be null really (although can be empty). Check anyway.
         	Set<String> aliases = serviceURLsMap.keySet();
         	for (Iterator<String> i = aliases.iterator(); i.hasNext(); ){
         		String alias = (String) i.next();
         		// Check if service URL list for this alias contains the newly entered URL
         		ArrayList<String> urls = (ArrayList<String>) serviceURLsMap.get(alias);
         		if (urls.contains(sURL)){
             		// Warn the user and exit
                 	JOptionPane.showMessageDialog(
                     		this,
                     		"The entered URL is already associated with another key pair entry",
                 			"Credential Manager Alert",
                 			JOptionPane.INFORMATION_MESSAGE);
                 	return;
         		}
         	 }
        	}

 		// Check if the entered URL is already associated with a password entry in the Keystore
 //       	ArrayList<String> urlList = (ArrayList<String>) ((CredentialManagerUI) this.getParent()).getURLsForPasswords();
 //		// Check if this url list contains the newly entered url
 //		if (urlList.contains(sURL)){
 //    		// Warn the user and exit
 //        	JOptionPane.showMessageDialog(
 //            		this,
 //            		"The entered URL is already associated with a password entry",
 //        			"Credential Manager Alert",
 //        			JOptionPane.INFORMATION_MESSAGE);
 //        	return;
 //		}

     	// Otherwise - the entered URL is not already associated with a different entry in the Keystore,
 		// so add this URL to the list of URLs for this key pair entry
         ((DefaultListModel) jltServiceURLs.getModel()).addElement(sURL);
         int index = ((DefaultListModel) jltServiceURLs.getModel()).getSize() - 1;
         // Element is appended to the list - get its index
         jltServiceURLs.setSelectedIndex(index);
         // Insure the newly added URL is visible
         jltServiceURLs.ensureIndexIsVisible(index);
     }

     /**
      * Cancel button pressed - close the dialog.
      */
     public void cancelPressed()
     {
     	// set everything to null, just in case some of the values have been set previously and
     	// the user pressed 'cancel' after that
     	privateKey = null;
     	certificateChain = null;
     	serviceURLs = null;
         closeDialog();
     }

     /**
      * Closes the dialog.
      */
     private void closeDialog()
     {
         setVisible(false);
         dispose();
     }

 }
	/*******************************************************************************
	* Copyright (C) 2007 The University of Manchester
	*
	* Modifications to the initial code base are copyright of their
	* respective authors, or their employers as appropriate.
	*
	* This program 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 program 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 program; if not, write to the Free Software
	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
	******************************************************************************/
	package net.sf.taverna.t2.workbench.ui.credentialmanager;

	import java.awt.BorderLayout;
	import java.awt.FlowLayout;
	import java.awt.Font;
	import java.awt.event.ActionEvent;
	import java.awt.event.ActionListener;
	import java.awt.event.WindowAdapter;
	import java.awt.event.WindowEvent;
	import java.security.GeneralSecurityException;
	import java.security.Key;
	import java.security.KeyStore;
	import java.security.cert.Certificate;
	import java.security.cert.X509Certificate;
	import java.util.ArrayList;
	import java.util.Enumeration;
	import java.util.HashMap;
	import java.util.Set;
	import java.util.Iterator;

	import javax.swing.JButton;
	import javax.swing.JDialog;
	import javax.swing.JFrame;
	import javax.swing.JLabel;
	import javax.swing.JList;
	import javax.swing.DefaultListModel;
	import javax.swing.JOptionPane;
	import javax.swing.JPanel;
	import javax.swing.JScrollPane;
	import javax.swing.BoxLayout;
	import javax.swing.ListSelectionModel;
	import javax.swing.border.CompoundBorder;
	import javax.swing.border.EmptyBorder;
	import javax.swing.border.EtchedBorder;
	import javax.swing.event.ListSelectionEvent;
	import javax.swing.event.ListSelectionListener;

	import net.sf.taverna.t2.security.credentialmanager.CMException;
	import net.sf.taverna.t2.security.credentialmanager.CMX509Util;
	import net.sf.taverna.t2.security.credentialmanager.CredentialManager;
	import net.sf.taverna.t2.workbench.ui.credentialmanager.GetServiceURLDialog;
	import net.sf.taverna.t2.workbench.ui.credentialmanager.ViewCertDetailsDialog;

	/**
	* Dialog that displays the details of all key pairs from a PKCS #12
	* keystore allowing the user to pick one for import.
	*
	* @author Alex Nenadic
	*/
	@SuppressWarnings("serial")
	class NewKeyPairEntryDialog extends JDialog
	{
	// List of key pairs available for import
	private JList jltKeyPairs;

	// Service URL text field for user to enter
	private JList jltServiceURLs;

	// Service URL (associated with the key pair)
	private ArrayList<String> serviceURLs;

	// PKCS #12 keystore */
	private KeyStore pkcs12KeyStore;

	// Private key part of key pair chosen by the user for import
	private Key privateKey;

	// Certificate chain part of key pair chosen by the user for import
	private Certificate[] certificateChain;

	// Key pair alias to be used for this entry in the Keystore
	private String alias;

	/**
	* Creates new form NewKeyPairEntryDialog where the parent is a frame.
	*/
	public NewKeyPairEntryDialog(JFrame parent, String title, boolean modal, KeyStore pkcs12KS)
	throws CMException
	{
	super(parent, title, modal);
	pkcs12KeyStore = pkcs12KS;
	initComponents();
	}

	/**
	* Creates new form NewKeyPairEntryDialog where the parent is a dialog.
	*/
	public NewKeyPairEntryDialog(JDialog parent, String title, boolean modal, KeyStore pkcs12KS)
	throws CMException
	{
	super(parent, title, modal);
	pkcs12KeyStore = pkcs12KS;
	initComponents();
	}

	/**
	* Get the private part of the key pair chosen by the user for import.
	*
	* @return The private key or null if the user has not chosen a key pair
	*/
	public Key getPrivateKey()
	{
	return privateKey;
	}

	/**
	* Get the certificate chain part of the key pair chosen by the
	* user for import.
	*
	* @return The certificate chain or null if the user has not
	* chosen a key pair
	*/
	public Certificate[] getCertificateChain()
	{
	return certificateChain;
	}

	/**
	* Get the alias of the key pair chosen by the user for import.
	*
	* @return the alias
	*/
	public String getAlias()
	{
	return alias;
	}

	/**
	* Get the service URLs entered by the user.
	*
	* @return list of service URLs
	*/
	public ArrayList<String> getServiceURLs()
	{
	return serviceURLs;
	}

	/**
	* Initialise the dialog's GUI components.
	*
	* @throws CMException A problem was encountered importing a key pair
	*/
	private void initComponents()
	throws CMException
	{
	// Instructions
	JLabel jlInstructions = new JLabel("Select a key pair for import:");
	jlInstructions.setFont(new Font(null, Font.PLAIN, 11));
	jlInstructions.setBorder(new EmptyBorder(5,5,5,5));
	JPanel jpInstructions = new JPanel(new BorderLayout());
	jpInstructions.add(jlInstructions, BorderLayout.WEST);

	// Import button
	final JButton jbImport = new JButton("Import");
	jbImport.setEnabled(false);
	jbImport.addActionListener(new ActionListener()
	{
	public void actionPerformed(ActionEvent evt)
	{
	importPressed();
	}
	});

	// Certificate details button
	final JButton jbCertificateDetails = new JButton("Certificate Details");
	jbCertificateDetails.setEnabled(false);
	jbCertificateDetails.addActionListener(new ActionListener()
	{
	public void actionPerformed(ActionEvent evt)
	{
	certificateDetailsPressed();
	}
	});

	// List to hold keystore's key pairs
	jltKeyPairs = new JList();
	jltKeyPairs.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
	jltKeyPairs.addListSelectionListener(new ListSelectionListener()
	{
	public void valueChanged(ListSelectionEvent evt)
	{
	if (jltKeyPairs.getSelectedIndex() == -1) {
	jbImport.setEnabled(false);
	jbCertificateDetails.setEnabled(false);
	}
	else {
	jbImport.setEnabled(true);
	jbCertificateDetails.setEnabled(true);
	}
	}
	});

	// Put the key list into a scroll pane
	JScrollPane jspKeyPairs = new JScrollPane(jltKeyPairs,
	JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED,
	JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);
	jspKeyPairs.getViewport().setBackground(jltKeyPairs.getBackground());

	// Service URLs list
	// Label
	JLabel jlServiceURL = new JLabel ("Service URLs the key pair will be used for:");
	jlServiceURL.setFont(new Font(null, Font.PLAIN, 11));
	jlServiceURL.setBorder(new EmptyBorder(5,5,5,5));
	// New empty service URLs list
	DefaultListModel jltModel = new DefaultListModel();
	jltServiceURLs = new JList(jltModel);
	// 'Add' service URL button
	JButton addButton = new JButton("Add");
	addButton.addActionListener(new ActionListener(){
	public void actionPerformed(ActionEvent evt)
	{
	addServiceURLPressed();
	}
	});
	addButton.setEnabled(true);
	// 'Remove' service URL button
	final JButton removeButton = new JButton("Remove");
	removeButton.addActionListener(new ActionListener(){
	public void actionPerformed(ActionEvent evt)
	{
	// get selected indices
	int[] selected = jltServiceURLs.getSelectedIndices();
	for (int i = selected.length -1; i>=0 ; i--){
	((DefaultListModel) jltServiceURLs.getModel()).remove(selected[i]);
	}
	}
	});
	removeButton.setEnabled(false);
	jltServiceURLs.addListSelectionListener(new ListSelectionListener()
	{
	public void valueChanged(ListSelectionEvent evt)
	{
	if (jltServiceURLs.getSelectedIndex() == -1) {
	removeButton.setEnabled(false);
	}
	else {
	removeButton.setEnabled(true);
	}
	}
	});
	// Scroll pane for service URLs list
	JScrollPane jspServiceURLs = new JScrollPane(jltServiceURLs,
	JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED,
	JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);
	jspServiceURLs.getViewport().setBackground(jltServiceURLs.getBackground());

	// Panel for Add and Remove buttons
	JPanel jpServiceURLsButtons = new JPanel(new FlowLayout(FlowLayout.CENTER));
	jpServiceURLsButtons.add(addButton);
	jpServiceURLsButtons.add(removeButton);

	// Panel to hold the list scroll pane and Add/Remove buttons panel
	JPanel jpServiceURLs = new JPanel(new BorderLayout());
	jpServiceURLs.add(jlServiceURL, BorderLayout.NORTH);
	jpServiceURLs.add(jspServiceURLs, BorderLayout.CENTER);
	jpServiceURLs.add(jpServiceURLsButtons, BorderLayout.SOUTH);

	// Put all the key pair components together
	JPanel jpKeyPairs = new JPanel(); // BoxLayout
	jpKeyPairs.setLayout(new BoxLayout(jpKeyPairs, BoxLayout.Y_AXIS));
	//jpKeyPairs.setPreferredSize(new Dimension(400, 200));
	jpKeyPairs.setBorder(new CompoundBorder(new CompoundBorder(
	new EmptyBorder(5, 5, 5, 5), new EtchedBorder()), new EmptyBorder(
	5, 5, 5, 5)));

	jpInstructions.setAlignmentY(JPanel.LEFT_ALIGNMENT);
	jpKeyPairs.add(jpInstructions);
	jspKeyPairs.setAlignmentY(JPanel.LEFT_ALIGNMENT);
	jpKeyPairs.add(jspKeyPairs);
	jbCertificateDetails.setAlignmentY(JPanel.RIGHT_ALIGNMENT);
	jpKeyPairs.add(jbCertificateDetails);
	jpServiceURLs.setAlignmentY(JPanel.LEFT_ALIGNMENT);
	jpKeyPairs.add(jpServiceURLs);

	// Cancel button
	final JButton jbCancel = new JButton("Cancel");
	jbCancel.addActionListener(new ActionListener()
	{
	public void actionPerformed(ActionEvent evt)
	{
	cancelPressed();
	}
	});

	JPanel jpButtons = new JPanel(new FlowLayout(FlowLayout.CENTER));
	jpButtons.add(jbImport);
	jpButtons.add(jbCancel);

	getContentPane().setLayout(new BorderLayout());
	getContentPane().add(jpKeyPairs, BorderLayout.CENTER);
	getContentPane().add(jpButtons, BorderLayout.SOUTH);

	// Populate the list
	populateList();

	addWindowListener(new WindowAdapter()
	{
	public void windowClosing(WindowEvent evt)
	{
	closeDialog();
	}
	});

	setResizable(false);

	getRootPane().setDefaultButton(jbImport);

	pack();

	}

	/**
	* Populate the key pair list with the PKCS #12 keystore's key
	* pair aliases.
	*
	* @throws CMException Problem accessing the keystore's entries
	*/
	private void populateList()
	throws CMException
	{
	try {
	ArrayList<String> vKeyPairAliases = new ArrayList<String>();

	// For each entry in the keystore...
	for (Enumeration<String> aliases = pkcs12KeyStore.aliases(); aliases.hasMoreElements();)
	{
	// Get alias
	String sAlias = (String) aliases.nextElement();

	// Add the alias to the list if the entry has a key
	// and certificates
	if (pkcs12KeyStore.isKeyEntry(sAlias)) {
	pkcs12KeyStore.getKey(sAlias, new char[] {});
	Certificate[] certs = pkcs12KeyStore.getCertificateChain(sAlias);

	if (certs != null && certs.length != 0) {
	vKeyPairAliases.add(sAlias);
	}
	}
	}

	if (vKeyPairAliases.size() > 0) {
	jltKeyPairs.setListData(vKeyPairAliases.toArray());
	jltKeyPairs.setSelectedIndex(0);
	}
	else {
	// No key pairs available...
	jltKeyPairs.setListData(new String[] { "-- No key pairs present in the Credential Store --" });
	jltKeyPairs.setEnabled(false);
	}
	}
	catch (GeneralSecurityException ex) {
	throw new CMException("Problem occured while accessing PKCS #12 keystore's entries.",
	ex);
	}
	}

	/**
	* 'Certificate Details' button pressed. Display the selected key
	* pair's certificate.
	*/
	private void certificateDetailsPressed()
	{
	try {

	String sAlias = (String) jltKeyPairs.getSelectedValue();

	assert sAlias != null;

	//Convert the certificate object into an X509Certificate object.
	X509Certificate cert = CMX509Util.convertCertificate(pkcs12KeyStore.getCertificate(sAlias));

	// Supply the certificate to the view certificate dialog
	ViewCertDetailsDialog viewCertificateDialog = new ViewCertDetailsDialog(this,
	"Certificate details",
	true,
	(X509Certificate) cert,
	null);
	viewCertificateDialog.setLocationRelativeTo(this);
	viewCertificateDialog.setVisible(true);

	}
	catch (Exception ex) {

	JOptionPane.showMessageDialog(this,
	"Failed to obtain certificate details to show.",
	"Credential Manager Alert",
	JOptionPane.WARNING_MESSAGE);
	closeDialog();
	}
	}


	/**
	* Import button pressed by user. Store the selected key pair's
	* private and public parts and service URLs and close the dialog.
	*/
	public void importPressed()
	{
	// Get Service URLs
	serviceURLs = new ArrayList<String>();
	Enumeration<?> URLs = (((DefaultListModel) jltServiceURLs.getModel()).elements());
	for( ; URLs.hasMoreElements(); ){
	serviceURLs.add((String) URLs.nextElement());
	}

	String sAlias = (String) jltKeyPairs.getSelectedValue();

	assert sAlias != null;

	try {
	privateKey = pkcs12KeyStore.getKey(sAlias, new char[] {});
	certificateChain = pkcs12KeyStore.getCertificateChain(sAlias);
	alias = sAlias;
	}
	catch (Exception ex) {
	JOptionPane.showMessageDialog(this,
	"Failed to load the private key and certificate chain from PKCS #12 file.",
	"Credential Manager Error",
	JOptionPane.ERROR_MESSAGE);
	closeDialog();
	}

	closeDialog();
	}

	/**
	* Add Service URL button pressed.
	*/
	public void addServiceURLPressed(){

	// Display the dialog for entering service URL
	GetServiceURLDialog dGetServiceURL = new GetServiceURLDialog(this, true);

	dGetServiceURL.setLocationRelativeTo(this);
	dGetServiceURL.setVisible(true);

	String sURL = dGetServiceURL.getServiceURL();

	if (sURL == null){ // user cancelled
	return;
	}

	if (sURL.length() == 0){ // user entered an empty URL
	// Warn the user
	JOptionPane.showMessageDialog(
	this,
	"Service URL cannot be empty",
	"Credential Manager Alert",
	JOptionPane.INFORMATION_MESSAGE);
	return;
	}

	// Check if the entered URL already exist in the URL list for this key entry
	if (((DefaultListModel) jltServiceURLs.getModel()).contains(sURL)){

	// Warn the user
	JOptionPane.showMessageDialog(
	this,
	"The entered URL already exists in the list of URLs for this key pair entry",
	"Credential Manager Alert",
	JOptionPane.INFORMATION_MESSAGE);
	return;
	}

	// Check if the entered URL is already associated with another key pair entry in the Keystore
	CredentialManager credManager = null;
	try {
	credManager = CredentialManager.getInstance();
	} catch (CMException cme) {
	// Failed to instantiate Credential Manager - warn the user and exit
	String sMessage = "Failed to instantiate Credential Manager. " + cme.getMessage();
	cme.printStackTrace();
	JOptionPane.showMessageDialog(new JFrame(), sMessage,
	"Credential Manager Error", JOptionPane.ERROR_MESSAGE);
	return;
	}
	// Get the lists of URLs for the alias
	HashMap<String, ArrayList<String>> serviceURLsMap = credManager.getServiceURLsforKeyPairs();
	if (serviceURLsMap != null){ // should not be null really (although can be empty). Check anyway.
	Set<String> aliases = serviceURLsMap.keySet();
	for (Iterator<String> i = aliases.iterator(); i.hasNext(); ){
	String alias = (String) i.next();
	// Check if service URL list for this alias contains the newly entered URL
	ArrayList<String> urls = (ArrayList<String>) serviceURLsMap.get(alias);
	if (urls.contains(sURL)){
	// Warn the user and exit
	JOptionPane.showMessageDialog(
	this,
	"The entered URL is already associated with another key pair entry",
	"Credential Manager Alert",
	JOptionPane.INFORMATION_MESSAGE);
	return;
	}
	}
	}

	// Check if the entered URL is already associated with a password entry in the Keystore
	// ArrayList<String> urlList = (ArrayList<String>) ((CredentialManagerUI) this.getParent()).getURLsForPasswords();
	// // Check if this url list contains the newly entered url
	// if (urlList.contains(sURL)){
	// // Warn the user and exit
	// JOptionPane.showMessageDialog(
	// this,
	// "The entered URL is already associated with a password entry",
	// "Credential Manager Alert",
	// JOptionPane.INFORMATION_MESSAGE);
	// return;
	// }

	// Otherwise - the entered URL is not already associated with a different entry in the Keystore,
	// so add this URL to the list of URLs for this key pair entry
	((DefaultListModel) jltServiceURLs.getModel()).addElement(sURL);
	int index = ((DefaultListModel) jltServiceURLs.getModel()).getSize() - 1;
	// Element is appended to the list - get its index
	jltServiceURLs.setSelectedIndex(index);
	// Insure the newly added URL is visible
	jltServiceURLs.ensureIndexIsVisible(index);
	}

	/**
	* Cancel button pressed - close the dialog.
	*/
	public void cancelPressed()
	{
	// set everything to null, just in case some of the values have been set previously and
	// the user pressed 'cancel' after that
	privateKey = null;
	certificateChain = null;
	serviceURLs = null;
	closeDialog();
	}

	/**
	* Closes the dialog.
	*/
	private void closeDialog()
	{
	setVisible(false);
	dispose();
	}

	}