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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */


package org.apache.catalina;

import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletResponse;

import org.apache.catalina.connector.Request;
import org.apache.catalina.deploy.LoginConfig;


/**
 * An Authenticator is a component (usually a Valve or Container) that
 * provides some sort of authentication service.
 *
 * @author Craig R. McClanahan
 * @version $Id: Authenticator.java 1005834 2010-10-08 14:02:05Z markt $
 */

public interface Authenticator {
    
    /**
     * Authenticate the user making this request, based on the specified
     * login configuration.  Return true if any specified
     * constraint has been satisfied, or false if we have
     * created a response challenge already.
     *
     * @param request Request we are processing
     * @param response Response we are populating
     * @param config    Login configuration describing how authentication
     *              should be performed
     *
     * @exception IOException if an input/output error occurs
     */
    public boolean authenticate(Request request, HttpServletResponse response,
            LoginConfig config) throws IOException;
    
    public void login(String userName, String password, Request request)
            throws ServletException;

    public void logout(Request request) throws ServletException;
}