org.jfxvnc.net.rfb.codec.security.RfbSecurityHandshaker.java Source code

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Here is the source code for org.jfxvnc.net.rfb.codec.security.RfbSecurityHandshaker.java

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/*******************************************************************************
 * 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");

    }

}