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The RabbitMQ Java client library allows Java applications to interface with RabbitMQ.

There is a newer version: 5.22.0

// Copyright (c) 2007-Present Pivotal Software, Inc.  All rights reserved.
//
// This software, the RabbitMQ Java client library, is triple-licensed under the
// Mozilla Public License 1.1 ("MPL"), the GNU General Public License version 2
// ("GPL") and the Apache License version 2 ("ASL"). For the MPL, please see
// LICENSE-MPL-RabbitMQ. For the GPL, please see LICENSE-GPL2.  For the ASL,
// please see LICENSE-APACHE2.
//
// This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND,
// either express or implied. See the LICENSE file for specific language governing
// rights and limitations of this software.
//
// If you have any questions regarding licensing, please contact us at
// [email protected].

package com.rabbitmq.client.impl.nio;

import javax.net.ssl.SSLEngine;
import javax.net.ssl.SSLEngineResult;
import javax.net.ssl.SSLException;
import java.io.IOException;
import java.io.InputStream;
import java.nio.ByteBuffer;
import java.nio.channels.ReadableByteChannel;

/**
 * Bridge between the byte buffer and stream worlds.
 */
public class SslEngineByteBufferInputStream extends InputStream {

    private final SSLEngine sslEngine;

    private final ByteBuffer plainIn, cipherIn;

    private final ReadableByteChannel channel;

    public SslEngineByteBufferInputStream(SSLEngine sslEngine, ByteBuffer plainIn, ByteBuffer cipherIn, ReadableByteChannel channel) {
        this.sslEngine = sslEngine;
        this.plainIn = plainIn;
        this.cipherIn = cipherIn;
        this.channel = channel;
    }

    @Override
    public int read() throws IOException {

        if (plainIn.hasRemaining()) {
            return readFromBuffer(plainIn);
        }

        plainIn.clear();

        while (true) {

            SSLEngineResult result = sslEngine.unwrap(cipherIn, plainIn);

            switch (result.getStatus()) {
                case OK:
                    plainIn.flip();
                    if (plainIn.hasRemaining()) {
                        return readFromBuffer(plainIn);
                    }
                    plainIn.clear();
                    break;
                case BUFFER_OVERFLOW:
                    throw new SSLException("buffer overflow in read");
                case BUFFER_UNDERFLOW:
                    cipherIn.compact();
                    int bytesRead = NioHelper.readWithRetry(channel, cipherIn);
                    if (bytesRead <= 0) {
                        throw new IllegalStateException("Should be reading something from the network");
                    }
                    cipherIn.flip();
                    break;
                case CLOSED:
                    throw new SSLException("closed in read");
                default:
                    throw new IllegalStateException("Invalid SSL status: " + result.getStatus());
            }
        }
    }

    private int readFromBuffer(ByteBuffer buffer) {
        return buffer.get() & 0xff;
    }
}