/*
 * @(#)AuthorizationPrompter.java			0.3-3 06/05/2001
 *
 *  This file is part of the HTTPClient package
 *  Copyright (C) 1996-2001  Ronald Tschalär
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Library General Public
 *  License as published by the Free Software Foundation; either
 *  version 2 of the License, or (at your option) any later version.
 *
 *  This library 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
 *  Library General Public License for more details.
 *
 *  You should have received a copy of the GNU Library General Public
 *  License along with this library; if not, write to the Free
 *  Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
 *  MA 02111-1307, USA
 *
 *  For questions, suggestions, bug-reports, enhancement-requests etc.
 *  I may be contacted at:
 *
 *  ronald@innovation.ch
 *
 *  The HTTPClient's home page is located at:
 *
 *  http://www.innovation.ch/java/HTTPClient/ 
 */

package HTTPClient;

/**
 * This is the interface that a username/password prompter must implement. The
 * {@link HTTPClient.DefaultAuthHandler DefaultAuthHandler} invokes an instance
 * of this each time it needs a username and password to satisfy an
 * authorization challenge (for which it doesn't already have the necessary
 * info).
 * 
 * This can be used to implement a different UI from the default popup box
 * for soliciting usernames and passwords, or for using an altogether
 * different way of getting the necessary auth info.
 *
 * @see DefaultAuthHandler#setAuthorizationPrompter(HTTPClient.AuthorizationPrompter)
 * @version	0.3-3  06/05/2001
 * @author	Ronald Tschalär
 * @since	V0.3-3
 */
public interface AuthorizationPrompter
{
    /**
     * This method is invoked whenever a username and password is required
     * for an authentication challenge to proceed.
     *
     * @param challenge the parsed challenge from the server; the host,
     *                  port, scheme, realm and params are set to the
     *                  values given by the server in the challenge.
     * @param forProxy  true if the info is for a proxy (i.e. this is part of
     *                  handling a 407 response); false otherwise (i.e. the
     *                  response code was 401).
     * @return an NVPair containing the username and password in the name
     *         and value fields, respectively, or null if the authorization
     *         challenge handling is to be aborted (e.g. when the user
     *         hits the <var>Cancel</var> button).
     */
    NVPair getUsernamePassword(AuthorizationInfo challenge, boolean forProxy);
}