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/* LoginModule.java -- interface for login implementations.

   Copyright (C) 2004  Free Software Foundation, Inc.

This file is 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, 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; see the file COPYING.  If not, write to the

Free Software Foundation, Inc., 51 Franklin Street, 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 javax.security.auth.spi;

import java.util.Map;

import javax.security.auth.Subject;

import javax.security.auth.callback.CallbackHandler;

import javax.security.auth.login.LoginException;

/**

 * The base interface for login methods in the Java Authentication and

 * Authorization Service (JAAS).

 *

 * <p>This interface is used by service providers that implement login

 * services, and is used internally by the JAAS system. It is not useful

 * to application programmers, who should use the {@link

 * javax.security.auth.login.LoginContext} instead.

 *

 * @author Casey Marshall (csm@gnu.org)

 */

public interface LoginModule

{

  /**

   * Abort the current login attempt. This is called after {@link #login()}

   * if the overall login attempt fails (that is, if one of the other login

   * modules that is REQUIRED or REQUISITE fails). This method should clean

   * up this module's saved state, if any.

   *

   * @return True if the abort succeeded, or false if this module should

   * be ignored.

   * @throws LoginException If the abort fails.

   */

  boolean abort() throws LoginException;

  /**

   * Commit the current login attempt. This is called after {@link

   * #login()} if the overall login attempt succeeds (that is, all

   * methods have satisfied all REQUIRED, REQUISITE, SUFFICIENT and

   * OPTIONAL module requirements).

   *

   * @return True if the commit succeeded, or false if this module

   * should be ignored.

   * @throws LoginException If the commit fails.

   */

  boolean commit() throws LoginException;

  /**

   * Initializes this login module. This method is called when the

   * instance implementing this interface is instantiated, and should

   * perform any initialization based on the given parameters.

   * Implementations should ignore state variables and options they do

   * not recognize.

   *

   * @param subject The subject being authenticated.

   * @param handler The callback handler for user input.

   * @param sharedState A mapping that is shared between all login

   * modules.

   * @param options A mapping of options given to this module.

   */

  void initialize(Subject subject, CallbackHandler handler,

                  Map<String, ?> sharedState, Map<String, ?> options);

  /**

   * Authenticates a subject to the system. This is the primary

   * mechanism by which subjects are authenticated, and typically

   * implementations will ask for credentials (for example, a user

   * name and password) which will then be verified.

   *

   * @return True if the subject was authenticated, or false if this

   * module should be ignored.

   * @throws LoginException If this method fails.

   */

  boolean login() throws LoginException;

  /**

   * Logs a subject out. This is primarily used for modules that must

   * destroy or remove the authentication state associated with a

   * logged-in subject.

   *

   * @return True if the logout succeeds, or false if this module

   * should be ignored.

   * @throws LoginException If this method fails.

   */

  boolean logout() throws LoginException;

}