Subversion Repositories openrisc

/* PasswordFile.java --

   Copyright (C) 2003, 2006 Free Software Foundation, Inc.

This file is a part of GNU Classpath.

GNU Classpath is free software; you can redistribute it and/or modify

it under the terms of the GNU General Public License as published by

the Free Software Foundation; either version 2 of the License, or (at

your option) any later version.

GNU Classpath 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

General Public License for more details.

You should have received a copy of the GNU General Public License

along with GNU Classpath; if not, write to the Free Software

Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301

USA

Linking this library statically or dynamically with other modules is

making a combined work based on this library.  Thus, the terms and

conditions of the GNU General Public License cover the whole

combination.

As a special exception, the copyright holders of this library give you

permission to link this library with independent modules to produce an

executable, regardless of the license terms of these independent

modules, and to copy and distribute the resulting executable under

terms of your choice, provided that you also meet, for each linked

independent module, the terms and conditions of the license of that

module.  An independent module is a module which is not derived from

or based on this library.  If you modify this library, you may extend

this exception to your version of the library, but you are not

obligated to do so.  If you do not wish to do so, delete this

exception statement from your version.  */

package gnu.javax.crypto.sasl.plain;

import gnu.java.lang.CPStringBuilder;

import gnu.java.security.action.GetPropertyAction;

import gnu.javax.crypto.sasl.NoSuchUserException;

import gnu.javax.crypto.sasl.UserAlreadyExistsException;

import java.io.BufferedReader;

import java.io.File;

import java.io.FileInputStream;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.InputStream;

import java.io.InputStreamReader;

import java.io.PrintWriter;

import java.security.AccessController;

import java.util.Enumeration;

import java.util.Hashtable;

import java.util.NoSuchElementException;

import java.util.StringTokenizer;

/**

 * A representation of a Plain password file.

 */

public class PasswordFile

{

  private static String DEFAULT_FILE;

  static

    {

      DEFAULT_FILE = (String) AccessController.doPrivileged

          (new GetPropertyAction(PlainRegistry.PASSWORD_FILE,

          PlainRegistry.DEFAULT_PASSWORD_FILE));

    }

  private Hashtable entries;

  private File passwdFile;

  private long lastmod;

  public PasswordFile() throws IOException

  {

    this(DEFAULT_FILE);

  }

  public PasswordFile(File pwFile) throws IOException

  {

    this(pwFile.getAbsolutePath());

  }

  public PasswordFile(String fileName) throws IOException

  {

    passwdFile = new File(fileName);

    update();

  }

  public synchronized void add(String user, String passwd, String[] attributes)

      throws IOException

  {

    checkCurrent();

    if (entries.containsKey(user))

      throw new UserAlreadyExistsException(user);

    if (attributes.length != 5)

      throw new IllegalArgumentException("Wrong number of attributes");

    // create the new entry

    String[] fields = new String[7];

    fields[0] = user;

    fields[1] = passwd;

    System.arraycopy(attributes, 0, fields, 2, 5);

    entries.put(user, fields);

    savePasswd();

  }

  public synchronized void changePasswd(String user, String passwd)

      throws IOException

  {

    checkCurrent();

    if (! entries.containsKey(user))

      throw new NoSuchUserException(user);

    String[] fields = (String[]) entries.get(user); // get the existing entry

    fields[1] = passwd; // modify the password field

    entries.remove(user); // delete the existing entry

    entries.put(user, fields); // add the new entry

    savePasswd();

  }

  public synchronized String[] lookup(String user) throws IOException

  {

    checkCurrent();

    if (! entries.containsKey(user))

      throw new NoSuchUserException(user);

    return (String[]) entries.get(user);

  }

  public synchronized boolean contains(String s) throws IOException

  {

    checkCurrent();

    return entries.containsKey(s);

  }

  private synchronized void update() throws IOException

  {

    lastmod = passwdFile.lastModified();

    readPasswd(new FileInputStream(passwdFile));

  }

  private void checkCurrent() throws IOException

  {

    if (passwdFile.lastModified() > lastmod)

      update();

  }

  private synchronized void readPasswd(InputStream in) throws IOException

  {

    BufferedReader din = new BufferedReader(new InputStreamReader(in));

    String line;

    entries = new Hashtable();

    String[] fields = new String[7];

    while ((line = din.readLine()) != null)

      {

        StringTokenizer st = new StringTokenizer(line, ":", true);

        try

          {

            fields[0] = st.nextToken(); // username

            st.nextToken();

            fields[1] = st.nextToken(); // passwd

            if (fields[1].equals(":"))

              fields[1] = "";

            else

              st.nextToken();

            fields[2] = st.nextToken(); // uid

            if (fields[2].equals(":"))

              fields[2] = "";

            else

              st.nextToken();

            fields[3] = st.nextToken(); // gid

            if (fields[3].equals(":"))

              fields[3] = "";

            else

              st.nextToken();

            fields[4] = st.nextToken(); // gecos

            if (fields[4].equals(":"))

              fields[4] = "";

            else

              st.nextToken();

            fields[5] = st.nextToken(); // dir

            if (fields[5].equals(":"))

              fields[5] = "";

            else

              st.nextToken();

            fields[6] = st.nextToken(); // shell

            if (fields[6].equals(":"))

              fields[6] = "";

          }

        catch (NoSuchElementException ignored)

          {

            continue;

          }

        entries.put(fields[0], fields);

      }

  }

  private synchronized void savePasswd() throws IOException

  {

    if (passwdFile != null)

      {

        FileOutputStream fos = new FileOutputStream(passwdFile);

        PrintWriter pw = null;

        try

          {

            pw = new PrintWriter(fos);

            String key;

            String[] fields;

            CPStringBuilder sb;

            Enumeration keys = entries.keys();

            while (keys.hasMoreElements())

              {

                key = (String) keys.nextElement();

                fields = (String[]) entries.get(key);

                sb = new CPStringBuilder(fields[0]);

                for (int i = 1; i < fields.length; i++)

                  sb.append(":" + fields[i]);

                pw.println(sb.toString());

              }

          }

        finally

          {

            if (pw != null)

              try

                {

                  pw.flush();

                }

              finally

                {

                  pw.close();

                }

            if (fos != null)

              try

                {

                  fos.close();

                }

              catch (IOException ignored)

                {

                }

            lastmod = passwdFile.lastModified();

          }

      }

  }

}