/*
 * JBoss, the OpenSource WebOS
 *
 * Distributable under LGPL license.
 * See terms of license at gnu.org.
 */
package org.jboss.security.auth.callback;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.IOException;
import javax.security.auth.callback.Callback;
import javax.security.auth.callback.CallbackHandler;
import javax.security.auth.callback.NameCallback;
import javax.security.auth.callback.PasswordCallback;
import javax.security.auth.callback.UnsupportedCallbackException;

/** An implementation of CallbackHandler that obtains the values for
 NameCallback and PasswordCallback from the console.

 @see javax.security.auth.callback.CallbackHandler
 @see #handle(Callback[])

 @author  Scott.Stark@jboss.org
 @version $Revision: 1.1.2.1 $
 */
public class ConsoleInputHandler implements CallbackHandler
{
   /** Sets any NameCallback name property to the instance username,
    sets any PasswordCallback password property to the instance, and any
    password.
    @exception UnsupportedCallbackException, thrown if any callback of
    type other than NameCallback or PasswordCallback are seen.
    */
   public void handle(Callback[] callbacks) throws
         UnsupportedCallbackException
   {
      for (int i = 0; i < callbacks.length; i++)
      {
         Callback c = callbacks[i];
         if (c instanceof NameCallback)
         {
            NameCallback nc = (NameCallback) c;
            String prompt = nc.getPrompt();
            if( prompt == null )
               prompt = "Enter Username: ";
            // Prompt the user for the username
            System.out.print(prompt);
            InputStreamReader isr = new InputStreamReader(System.in);
            BufferedReader br = new BufferedReader(isr);
            try
            {
               String username = br.readLine();
               nc.setName(username);
            }
            catch(IOException e)
            {
               throw new SecurityException("Failed to obtain username, ioe="+e.getMessage());
            }
         }
         else if (c instanceof PasswordCallback)
         {
            PasswordCallback pc = (PasswordCallback) c;
            String prompt = pc.getPrompt();
            if( prompt == null )
               prompt = "Enter Password: ";
            // Prompt the user for the username
            System.out.print(prompt);
            InputStreamReader isr = new InputStreamReader(System.in);
            BufferedReader br = new BufferedReader(isr);
            try
            {
               String password = br.readLine();            
               pc.setPassword(password.toCharArray());
            }
            catch(IOException e)
            {
               throw new SecurityException("Failed to obtain password, ioe="+e.getMessage());
            }
         }
         else
         {
            throw new UnsupportedCallbackException(callbacks[i], "Unrecognized Callback");
         }
      }
   }
}
