/**
 * 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.kafka.common.security.auth;

import java.util.Map;

import org.apache.kafka.common.network.Mode;

import javax.security.auth.Subject;
import javax.security.auth.callback.CallbackHandler;

/*
 * Callback handler for SASL-based authentication
 */
public interface AuthCallbackHandler extends CallbackHandler {

    /**
     * Configures this callback handler.
     *
     * @param configs Configuration
     * @param mode The mode that indicates if this is a client or server connection
     * @param subject Subject from login context
     * @param saslMechanism Negotiated SASL mechanism
     */
    void configure(Map<String, ?> configs, Mode mode, Subject subject, String saslMechanism);

    /**
     * Closes this instance.
     */
    void close();
}