/**
 * 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.storm.security.auth;

import java.util.Map;
import javax.security.auth.Subject;

/**
 * Provides a way to automatically push credentials to a topology and to retrieve them in the worker.
 */
public interface IAutoCredentials {

    void prepare(Map<String, Object> conf);

    /**
     * Called to populate the credentials on the client side.
     *
     * @param credentials the credentials to be populated.
     */
    void populateCredentials(Map<String, String> credentials);

    /**
     * Called to initially populate the subject on the worker side with credentials passed in.
     *
     * @param subject     the subject to optionally put credentials in.
     * @param credentials the credentials to be used.
     */
    void populateSubject(Subject subject, Map<String, String> credentials);


    /**
     * Called to update the subject on the worker side when new credentials are received. This means that populateSubject has already been
     * called on this subject.
     *
     * @param subject     the subject to optionally put credentials in.
     * @param credentials the credentials to be used.
     */
    void updateSubject(Subject subject, Map<String, String> credentials);

}
