/**
 * 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;

/**
 * Nimbus could be configured with an authorization plugin. If not specified, all requests are authorized.
 *
 * <p>You could specify the authorization plugin via storm parameter. For example:
 *
 * <p>``` storm -c nimbus.authorization.class=org.apache.storm.security.auth.NoopAuthorizer ... ```
 *
 * <p>You could also specify it via storm.yaml:
 *
 * <p>```yaml nimbus.authorization.class: org.apache.storm.security.auth.NoopAuthorizer ```
 */
public interface IAuthorizer {
    /**
     * Invoked once immediately after construction.
     *
     * @param conf Storm cluster configuration
     */
    void prepare(Map<String, Object> conf);

    /**
     * permit() method is invoked for each incoming Thrift request.
     *
     * @param context   request context includes info about
     * @param operation operation name
     * @param topoConf  configuration of targeted topology
     * @return true if the request is authorized, false if reject
     */
    boolean permit(ReqContext context, String operation, Map<String, Object> topoConf);
}