/*
 * JBoss, Home of Professional Open Source.
 * Copyright 2006, Red Hat Middleware LLC, and individual contributors
 * as indicated by the @author tags. See the copyright.txt file in the
 * distribution for a full listing of individual contributors.
 *
 * This 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 software 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 software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */
package org.jboss.security.plugins;

import java.io.IOException;
import java.io.CharArrayWriter;

/** Read a password from the System.in stream. This may be used as a
 password accessor in conjunction with the JaasSecurityDomain
 {CLASS}org.jboss.security.plugins.ConsolePassword
 format of the KeyStorePass attribute.

 @author Scott.Stark@jboss.org
 @version $Revison:$
 */
public class ConsolePassword
{
   public ConsolePassword()
   {
   }

   public char[] toCharArray()
      throws IOException
   {
      System.err.print("Enter password: ");
      CharArrayWriter writer = new CharArrayWriter();
      int b;
      while( (b = System.in.read()) >= 0 )
      {
         if( b == '\r' || b == '\n' )
            break;
         writer.write(b);
      }
      char[] password = writer.toCharArray();
      writer.reset();
      for(int n = 0; n < password.length; n ++)
         writer.write('\0');
      return password;
   }

   public static void main(String[] args) throws IOException
   {
      ConsolePassword cp = new ConsolePassword();
      System.out.println(new String(cp.toCharArray()));
   }
}
