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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.sshd.server.auth;

import org.apache.sshd.common.auth.UserAuthInstance;
import org.apache.sshd.common.auth.UsernameHolder;
import org.apache.sshd.common.util.buffer.Buffer;
import org.apache.sshd.server.session.ServerSession;
import org.apache.sshd.server.session.ServerSessionHolder;

/**
 * Server side authentication mechanism.
 *
 * @author Apache MINA SSHD Project
 */
public interface UserAuth extends ServerSessionHolder, UserAuthInstance, UsernameHolder {
    /**
     * Try to authenticate the user. This methods should return a non {@code null} value indicating if the
     * authentication succeeded. If the authentication is still ongoing, a {@code null} value should be returned.
     *
     * @param  session            the current {@link ServerSession} session
     * @param  username           the user trying to log in
     * @param  service            the requested service name
     * @param  buffer             the request buffer containing parameters specific to this request
     * @return                    true if the authentication succeeded, false if the
     *                            authentication failed and {@code null} if not finished yet
     * @throws AsyncAuthException if the service is willing to perform an asynchronous authentication
     * @throws Exception          if the authentication fails
     */
    Boolean auth(ServerSession session, String username, String service, Buffer buffer) throws AsyncAuthException, Exception;

    /**
     * Handle another step in the authentication process.
     *
     * @param  buffer             the request buffer containing parameters specific to this request
     * @return                    true if the authentication succeeded, false if the
     *                            authentication failed and {@code null} if not finished yet
     * @throws AsyncAuthException if the service is willing to perform an asynchronous authentication
     * @throws Exception          if the authentication fails
     */
    Boolean next(Buffer buffer) throws AsyncAuthException, Exception;

    /**
     * Free any system resources used by the module.
     */
    void destroy();
}