pmixmlpolicyeditor.java

一个完整的XACML工程,学习XACML技术的好例子!

/*
* Copyright (c) 2006, University of Kent
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without 
* modification, are permitted provided that the following conditions are met:
*
* Redistributions of source code must retain the above copyright notice, this 
* list of conditions and the following disclaimer.
* 
* Redistributions in binary form must reproduce the above copyright notice, 
* this list of conditions and the following disclaimer in the documentation 
* and/or other materials provided with the distribution. 
*
* 1. Neither the name of the University of Kent nor the names of its 
* contributors may be used to endorse or promote products derived from this 
* software without specific prior written permission. 
*
* 2. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS  
* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 
* PURPOSE ARE DISCLAIMED. 
*
* 3. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
* 4. YOU AGREE THAT THE EXCLUSIONS IN PARAGRAPHS 2 AND 3 ABOVE ARE REASONABLE
* IN THE CIRCUMSTANCES.  IN PARTICULAR, YOU ACKNOWLEDGE (1) THAT THIS
* SOFTWARE HAS BEEN MADE AVAILABLE TO YOU FREE OF CHARGE, (2) THAT THIS
* SOFTWARE IS NOT "PRODUCT" QUALITY, BUT HAS BEEN PRODUCED BY A RESEARCH
* GROUP WHO DESIRE TO MAKE THIS SOFTWARE FREELY AVAILABLE TO PEOPLE WHO WISH
* TO USE IT, AND (3) THAT BECAUSE THIS SOFTWARE IS NOT OF "PRODUCT" QUALITY
* IT IS INEVITABLE THAT THERE WILL BE BUGS AND ERRORS, AND POSSIBLY MORE
* SERIOUS FAULTS, IN THIS SOFTWARE.
*
* 5. This license is governed, except to the extent that local laws
* necessarily apply, by the laws of England and Wales.
*/

/*
* Copyright (c) 2000-2005, University of Salford
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without 
* modification, are permitted provided that the following conditions are met:
*
* Redistributions of source code must retain the above copyright notice, this 
* list of conditions and the following disclaimer.
* 
* Redistributions in binary form must reproduce the above copyright notice, 
* this list of conditions and the following disclaimer in the documentation 
* and/or other materials provided with the distribution. 
*
* Neither the name of the University of Salford nor the names of its 
* contributors may be used to endorse or promote products derived from this 
* software without specific prior written permission. 
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 
* POSSIBILITY OF SUCH DAMAGE.
*/

package issrg.acm.extensions;

import java.util.Vector;
import java.awt.*;
import java.util.Map;
import issrg.ac.AttributeValue;

// here's Java XML Parsing stuff
import javax.xml.parsers.SAXParserFactory;
import javax.xml.parsers.SAXParser;
import org.xml.sax.helpers.DefaultHandler;

import issrg.ac.attributes.PMIXMLPolicy;
import issrg.pba.rbac.xmlpolicy.XMLPolicyParser;
import issrg.pba.PolicyParser;



/**
 * This class is intended to provide some GUI for inputting XML
 * Policy attribute value. At the moment it simply displays a text area,
 * where the user is expected to paste his Policy.
 *
 * @author A Otenko
 * @version 1.0
 */
public class PMIXMLPolicyEditor extends issrg.acm.AttributeEditor {

  /**
   * This is the OID of the pMIXMLPolicy attribute. Its value is
   * "1.2.826.0.1.3344810.1.1.13".
   */
  public static final String PMI_XML_POLICY_OID = "1.2.826.0.1.3344810.1.1.13";

  /**
   * This is what will be added after each line when saving the Policy onto a disk.
   * Note, that at the moment it is 0x0a0d, which is DOS format (Unix format
   * would be 0x0a only).
   */
  public static final String CRLF = "\r\n";

  private static final int width = 500;
  private static final int height = 400;
  private static final int pHeight = 65;
  private boolean isCancelled = true;           // is set to false by "Ok" button

  private boolean dontValidate = true;

  /**
   * This is a name of configuration file variable to set when the user wants the
   * XML to be validated automatically before it can be stored in an AC. Its name
   * is "PMIXMLPolicyEditor.Validate". It must just be present in the [variables]
   * section.
   */
  public static final String VALIDATE_FLAG = "PMIXMLPolicyEditor.Validate";

  /**
   * This is what the extension of the sought files would be. At the moment it is
   * ".xml".
   */
  public static final String XML_EXTENSION = ".xml";

  private static final javax.swing.filechooser.FileFilter xmlFilter = new javax.swing.filechooser.FileFilter(){
                  public boolean accept(java.io.File pathname){
                    return issrg.utils.Util.extensionMatch(pathname.getName(), XML_EXTENSION) || pathname.isDirectory();
                  }

                  public String getDescription(){
                    return "PMI XML Policy files "+issrg.utils.Util.JFC_OPEN_BRACKET+XML_EXTENSION+issrg.utils.Util.JFC_CLOSE_BRACKET;
                  }
              };

  private static final javax.swing.JFileChooser jfc = issrg.utils.Util.createFileChooser();
  static{
    jfc.addChoosableFileFilter(xmlFilter);
  }

  public PMIXMLPolicyEditor() {
  }

  public String getName() {
//    return "PMI XML Policy : "+getOID();
    return "PMI XML Policy";
  }

  public String getOID() {
    return PMI_XML_POLICY_OID;
  }

  public Vector buildValues(Frame parentComponent, Map environment, Vector values, issrg.acm.Registry registry) throws issrg.acm.ACCreationException {
    jfc.setFileFilter(xmlFilter);
    PMIXMLPolicy result = null;

    dontValidate=registry.getCollection(issrg.acm.EnvironmentalVariables.VARIABLES_COLLECTION).
                  get(VALIDATE_FLAG)==null;
    try{
      if (values==null){
        result = new PMIXMLPolicy("");
      }else{
        AttributeValue av = (AttributeValue)(values.firstElement());
        if (!av.isDecoded()){
          result = new PMIXMLPolicy(av);
        }else{
          result = (PMIXMLPolicy)av;
        }
      }
    }catch (iaik.asn1.CodingException ce){
      throw new issrg.acm.ACCreationException("Error parsing the Attribute value: PMIXMLPolicy attribute was expected", ce);
    }

    String output = showInputDialog(parentComponent,
                                          "Input XML Policy here:",
                                          result.getPolicy());
    if (output!=null){
      values= new java.util.Vector();
      values.add(new PMIXMLPolicy(output));
    }else values=null;    // thus spec says

    return values;
  }

  public AttributeValue parseAttribute(AttributeValue av) throws iaik.asn1.CodingException {
    return new PMIXMLPolicy(av);
  }

  /**
   * Shows an input dialog with the edit memo and several buttons for loading and
   * verification of the policy.
   */
  protected String showInputDialog(Frame parentComponent, String title, final String oldvalue){
    final javax.swing.JDialog dialog = new javax.swing.JDialog(parentComponent);
    final javax.swing.JTextArea text = new javax.swing.JTextArea();
    final StringBuffer sb = new StringBuffer(oldvalue);
    javax.swing.JPanel contentPane = (javax.swing.JPanel)dialog.getContentPane();
    javax.swing.JPanel panel = new javax.swing.JPanel(null);
    javax.swing.JScrollPane scrollPane = new javax.swing.JScrollPane(text);
    text.setBounds(0, 0, width, height);

    dialog.setTitle(title);
    dialog.setResizable(false);

    java.awt.Dimension d = java.awt.Toolkit.getDefaultToolkit().getScreenSize();
    dialog.setBounds((d.width-width)/2, (d.height-height)/2, width, height);
    contentPane.setLayout(null/*new java.awt.BorderLayout(0, 2)*/);

    scrollPane.setBounds(0,0, width-8, height-pHeight);
    panel.setBounds(0, height-pHeight, width, pHeight);

    contentPane.add(scrollPane);
    contentPane.add(panel);

    javax.swing.JButton b;

    b = new javax.swing.JButton("Load...");
    b.addActionListener(new java.awt.event.ActionListener(){
                public void actionPerformed(java.awt.event.ActionEvent ae){
                  jfc.rescanCurrentDirectory();
                  jfc.showOpenDialog(dialog);

                  java.io.File f = jfc.getSelectedFile();

                  if (f!=null){
                    try{
                      java.io.BufferedReader br = new java.io.BufferedReader(new java.io.FileReader(f));
                      StringBuffer sb1 = new StringBuffer();
                      while (br.ready()){
			String s = br.readLine();
			if (s==null) break;
                        sb1.append(s);
                        sb1.append(CRLF);
                      }
                      br.close();

                      text.setText(sb1.toString());
                    }catch (java.io.IOException ioe){
                      issrg.utils.Util.bewail(ioe.getMessage(), ioe, dialog);
                    }
                  }
                }
              });

    panel.add(b);

    b = new javax.swing.JButton("Verify XML");
    b.addActionListener(new java.awt.event.ActionListener(){
                public void actionPerformed(java.awt.event.ActionEvent ae){
                  if (verifyXML(dialog, text.getText())){
                    javax.swing.JOptionPane.showMessageDialog(dialog,
                                  "XML is correct",
                                  "Verification result",
                                  javax.swing.JOptionPane.INFORMATION_MESSAGE);
                  }
                }
              });

    panel.add(b);

    b = new javax.swing.JButton("Save...");
    b.addActionListener(new java.awt.event.ActionListener(){
                public void actionPerformed(java.awt.event.ActionEvent ae){
                  jfc.rescanCurrentDirectory();

                  jfc.showSaveDialog(dialog);

                  java.io.File f = jfc.getSelectedFile();

                  try{
                    if (f!=null){
                      java.io.BufferedWriter bw = new java.io.BufferedWriter(new java.io.FileWriter(f));
                      bw.write(text.getText());
                      bw.close();
                    }
                  }catch (java.io.IOException ioe){
                    issrg.utils.Util.bewail(ioe.getMessage(), ioe, dialog);
                  }
                }
              });

    panel.add(b);

    b = new javax.swing.JButton("OK");
    b.addActionListener(new java.awt.event.ActionListener(){
                public void actionPerformed(java.awt.event.ActionEvent ae){
                  String s=text.getText();
                  if (dontValidate || verifyXML(dialog, s)){
                    sb.setLength(0);    // remove old string
                    sb.append(s);  // set new value to return from this method
                    dialog.dispose();
                    isCancelled=false;    // do not return null now: return the policy string.
                  }
                }
              });

    panel.add(b);

    b = new javax.swing.JButton("Cancel");
    b.addActionListener(new java.awt.event.ActionListener(){
                public void actionPerformed(java.awt.event.ActionEvent ae){
                  dialog.dispose();   // the old value will be returned
                }
              });

    panel.add(b);

    panel.setLayout(new java.awt.FlowLayout());

    text.setText(oldvalue);
    dialog.setModal(true);
    synchronized(this){   // do not allow changing the isCancelled value
      isCancelled=true;
      dialog.show();

      if (isCancelled) return null;

      return sb.toString();
    }
  }

  private boolean verifyXML(Component dialog, String s){
/*      try{
          PolicyParser p = new XMLPolicyParser(s);
        return true;
      }catch(Throwable th){
        issrg.utils.Util.bewail(th.getMessage(), th, dialog);
        return false;
      } */
    SAXParserFactory spf = SAXParserFactory.newInstance();
    spf.setNamespaceAware(true);
    spf.setValidating(true);

    try{
      SAXParser sp = spf.newSAXParser();
      sp.parse(new java.io.ByteArrayInputStream(s.getBytes()), new DefaultHandler());
      return true;
    }catch(Exception ioe){
      issrg.utils.Util.bewail(ioe.getMessage(), ioe, dialog);
      return false;
    }
  }
}