RfbSecurityHandshaker.java

/*******************************************************************************
 * Copyright (c) 2016 comtel inc.
 *
 * 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 org.jfxvnc.net.rfb.codec.security;

import java.util.concurrent.atomic.AtomicBoolean;

import org.jfxvnc.net.rfb.codec.handshaker.RfbClientDecoder;
import org.jfxvnc.net.rfb.codec.handshaker.RfbClientEncoder;

import io.netty.buffer.Unpooled;
import io.netty.channel.Channel;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelPipeline;
import io.netty.channel.ChannelPromise;

public abstract class RfbSecurityHandshaker {

  public abstract RfbSecurityDecoder newSecurityDecoder();

  public abstract RfbSecurityEncoder newSecurityEncoder();

  private AtomicBoolean handshakeComplete = new AtomicBoolean(false);

  private final SecurityType securityType;

  public RfbSecurityHandshaker(SecurityType securityType) {
    this.securityType = securityType;
  }

  public boolean isHandshakeComplete() {
    return handshakeComplete.get();
  }

  private void setHandshakeComplete() {
    handshakeComplete.set(true);
  }

  public ChannelFuture handshake(Channel channel, boolean sendResponse) {
    return handshake(channel, sendResponse, channel.newPromise());
  }

  public final ChannelFuture handshake(Channel channel, boolean sendResponse, ChannelPromise promise) {
    ChannelPipeline p = channel.pipeline();
    ChannelHandlerContext ctx = p.context(RfbClientDecoder.class);
    p.addBefore(ctx.name(), "rfb-security-decoder", newSecurityDecoder());

    ChannelHandlerContext ctx2 = p.context(RfbClientEncoder.class);
    p.addBefore(ctx2.name(), "rfb-security-encoder", newSecurityEncoder());
    if (!sendResponse) {
      return promise.setSuccess();
    }
    channel.writeAndFlush(Unpooled.buffer(1).writeByte(securityType.getType()), promise);
    return promise;
  }

  public final void finishHandshake(Channel channel, RfbSecurityMessage message) {
    setHandshakeComplete();

    ChannelPipeline p = channel.pipeline();
    p.remove("rfb-security-decoder");
    p.remove("rfb-security-encoder");

  }

}