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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 jakarta.security.auth.message;

import javax.security.auth.Subject;

public interface ClientAuth {

    /**
     * Secure (authenticate) the request.
     *
     * @param messageInfo   The associated request and response
     * @param clientSubject The subject that represents the source of the request
     *
     * @return An AuthStatus instance that represents the result of the authentication
     *
     * @throws AuthException If the a failure occurred in a manner that prevented the failure from being communicated
     *                           via messageInfo
     */
    AuthStatus secureRequest(MessageInfo messageInfo, Subject clientSubject) throws AuthException;

    /**
     * Validate a response.
     *
     * @param messageInfo    The associated request and response
     * @param clientSubject  The subject that represents the recipient of the response
     * @param serviceSubject The subject that represents the source of the response
     *
     * @return An AuthStatus instance that represents the result of the validation
     *
     * @throws AuthException If the a failure occurred in a manner that prevented the failure from being communicated
     *                           via messageInfo
     */
    default AuthStatus validateResponse(MessageInfo messageInfo, Subject clientSubject, Subject serviceSubject)
            throws AuthException {
        return AuthStatus.SUCCESS;
    }

    /**
     * Remove principals and/or credentials from the subject that were previously added by this authentication
     * mechanism.
     *
     * @param messageInfo The associated request and response
     * @param subject     The subject to clean
     *
     * @throws AuthException If the a failure occurred
     */
    default void cleanSubject(MessageInfo messageInfo, Subject subject) throws AuthException {
        // NO-OP
    }
}