org.apache.hadoop.hbase.security.CryptoAESWrapHandler.java Source code

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Here is the source code for org.apache.hadoop.hbase.security.CryptoAESWrapHandler.java

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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 org.apache.hadoop.hbase.security;

import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelOutboundHandlerAdapter;
import io.netty.channel.ChannelPromise;
import io.netty.channel.CoalescingBufferQueue;
import io.netty.util.ReferenceCountUtil;
import io.netty.util.concurrent.PromiseCombiner;
import org.apache.hadoop.hbase.classification.InterfaceAudience;
import org.apache.hadoop.hbase.io.crypto.aes.CryptoAES;

import java.io.IOException;

/**
 * wrap messages with Crypto AES.
 */
@InterfaceAudience.Private
public class CryptoAESWrapHandler extends ChannelOutboundHandlerAdapter {

    private final CryptoAES cryptoAES;

    private CoalescingBufferQueue queue;

    public CryptoAESWrapHandler(CryptoAES cryptoAES) {
        this.cryptoAES = cryptoAES;
    }

    @Override
    public void handlerAdded(ChannelHandlerContext ctx) throws Exception {
        queue = new CoalescingBufferQueue(ctx.channel());
    }

    @Override
    public void write(ChannelHandlerContext ctx, Object msg, ChannelPromise promise) throws Exception {
        if (msg instanceof ByteBuf) {
            queue.add((ByteBuf) msg, promise);
        } else {
            ctx.write(msg, promise);
        }
    }

    @Override
    public void flush(ChannelHandlerContext ctx) throws Exception {
        if (queue.isEmpty()) {
            return;
        }
        ByteBuf buf = null;
        try {
            ChannelPromise promise = ctx.newPromise();
            int readableBytes = queue.readableBytes();
            buf = queue.remove(readableBytes, promise);
            byte[] bytes = new byte[readableBytes];
            buf.readBytes(bytes);
            byte[] wrapperBytes = cryptoAES.wrap(bytes, 0, bytes.length);
            ChannelPromise lenPromise = ctx.newPromise();
            ctx.write(ctx.alloc().buffer(4).writeInt(wrapperBytes.length), lenPromise);
            ChannelPromise contentPromise = ctx.newPromise();
            ctx.write(Unpooled.wrappedBuffer(wrapperBytes), contentPromise);
            PromiseCombiner combiner = new PromiseCombiner();
            combiner.addAll(lenPromise, contentPromise);
            combiner.finish(promise);
            ctx.flush();
        } finally {
            if (buf != null) {
                ReferenceCountUtil.safeRelease(buf);
            }
        }
    }

    @Override
    public void close(ChannelHandlerContext ctx, ChannelPromise promise) throws Exception {
        if (!queue.isEmpty()) {
            queue.releaseAndFailAll(new IOException("Connection closed"));
        }
        ctx.close(promise);
    }
}