001/*
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *     http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018package org.apache.hadoop.hbase.security;
019
020import javax.security.sasl.SaslException;
021import org.apache.yetus.audience.InterfaceAudience;
022
023import org.apache.hbase.thirdparty.io.netty.buffer.ByteBuf;
024import org.apache.hbase.thirdparty.io.netty.channel.ChannelHandlerContext;
025import org.apache.hbase.thirdparty.io.netty.handler.codec.MessageToByteEncoder;
026
027/**
028 * wrap sasl messages.
029 */
030@InterfaceAudience.Private
031public class SaslWrapHandler extends MessageToByteEncoder<ByteBuf> {
032
033  public interface Wrapper {
034    byte[] wrap(byte[] outgoing, int offset, int len) throws SaslException;
035  }
036
037  private final Wrapper wrapper;
038
039  public SaslWrapHandler(Wrapper wrapper) {
040    this.wrapper = wrapper;
041  }
042
043  @Override
044  protected void encode(ChannelHandlerContext ctx, ByteBuf msg, ByteBuf out) throws Exception {
045    byte[] bytes = new byte[msg.readableBytes()];
046    msg.readBytes(bytes);
047    byte[] wrapperBytes = wrapper.wrap(bytes, 0, bytes.length);
048    out.ensureWritable(4 + wrapperBytes.length);
049    out.writeInt(wrapperBytes.length);
050    out.writeBytes(wrapperBytes);
051  }
052}