//
   //  ========================================================================
   //  Copyright (c) 1995-2016 Mort Bay Consulting Pty. Ltd.
   //  ------------------------------------------------------------------------
   //  All rights reserved. This program and the accompanying materials
   //  are made available under the terms of the Eclipse Public License v1.0
   //  and Apache License v2.0 which accompanies this distribution.
   //
   //      The Eclipse Public License is available at
  //      http://www.eclipse.org/legal/epl-v10.html
  //
  //      The Apache License v2.0 is available at
  //      http://www.opensource.org/licenses/apache2.0.php
  //
  //  You may elect to redistribute this code under either of these licenses.
  //  ========================================================================
  //
  
  package org.eclipse.jetty.jaas.callback;
  
  import java.io.IOException;
  import java.util.Arrays;
  
  import javax.security.auth.callback.Callback;
  import javax.security.auth.callback.NameCallback;
  import javax.security.auth.callback.PasswordCallback;
  import javax.security.auth.callback.UnsupportedCallbackException;
  
  import org.eclipse.jetty.server.Request;
  import org.eclipse.jetty.util.security.Password;
  
  /** 
   * DefaultUsernameCredentialCallbackHandler
   */
  public class DefaultCallbackHandler extends AbstractCallbackHandler
  {
      private Request _request;
  
      public void setRequest (Request request)
      {
          this._request = request;
      }
  
      public void handle (Callback[] callbacks)
          throws IOException, UnsupportedCallbackException
      {
          for (int i=0; i < callbacks.length; i++)
          {
              if (callbacks[i] instanceof NameCallback)
              {
                  ((NameCallback)callbacks[i]).setName(getUserName());
              }
              else if (callbacks[i] instanceof ObjectCallback)
              {
                  ((ObjectCallback)callbacks[i]).setObject(getCredential());
              }
              else if (callbacks[i] instanceof PasswordCallback)
              {
                  if (getCredential() instanceof Password)
                      ((PasswordCallback)callbacks[i]).setPassword (((Password)getCredential()).toString().toCharArray());
                  else if (getCredential() instanceof String)
                  {
                      ((PasswordCallback)callbacks[i]).setPassword (((String)getCredential()).toCharArray());
                  }
                  else
                      throw new UnsupportedCallbackException (callbacks[i], "User supplied credentials cannot be converted to char[] for PasswordCallback: try using an ObjectCallback instead");
              }
              else if (callbacks[i] instanceof RequestParameterCallback)
              {
                  RequestParameterCallback callback = (RequestParameterCallback)callbacks[i];
                  callback.setParameterValues(Arrays.asList(_request.getParameterValues(callback.getParameterName())));
              }
              else
                  throw new UnsupportedCallbackException(callbacks[i]);
          }
  
      }
  
  }