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SDK for the development of HiveMQ extensions

There is a newer version: 4.35.0

/*
 * Copyright 2018-present HiveMQ GmbH
 *
 * Licensed 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 com.hivemq.extension.sdk.api.auth;

import com.hivemq.extension.sdk.api.annotations.NotNull;
import com.hivemq.extension.sdk.api.auth.parameter.PublishAuthorizerInput;
import com.hivemq.extension.sdk.api.auth.parameter.PublishAuthorizerOutput;

/**
 * Interface for the PUBLISH authorization.
 * 
 * An Authorizer is always called by the same Thread for all messages from the same client.
 * 

 * If the same instance is shared between multiple clients it can be called in different Threads and must therefore be
 * thread-safe.
 *
 * @author Christoph Schäbel
 * @since 4.0.0, CE 2019.1
 */
public interface PublishAuthorizer extends Authorizer {

    /**
     * This method is called for every PUBLISH packet and Will Publish, that the {@link PublishAuthorizer} is delegated
     * to authorize.
     * 
     * When the extension is enabled after HiveMQ is already running, this method will also be called for future
     * PUBLISHes of clients that are already connected.
     *
     * @param publishAuthorizerInput  The {@link PublishAuthorizerInput}.
     * @param publishAuthorizerOutput The {@link PublishAuthorizerOutput}.
     * @since 4.0.0, CE 2019.1
     */
    void authorizePublish(
            @NotNull PublishAuthorizerInput publishAuthorizerInput,
            @NotNull PublishAuthorizerOutput publishAuthorizerOutput);
}