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    • io.netty.example.portunification.PortUnificationServerHandler Maven / Gradle / Ivy

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    This artifact provides a single jar that contains all classes required to use remote Jakarta Enterprise Beans and Jakarta Messaging, including all dependencies. It is intended for use by those not using maven, maven users should just import the Jakarta Enterprise Beans and Jakarta Messaging BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up with different versions on classes on the class path).

    There is a newer version: 35.0.0.Beta1
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    /*
 * Copyright 2012 The Netty Project
 *
 * The Netty Project 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 io.netty.example.portunification;

import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelPipeline;
import io.netty.example.factorial.BigIntegerDecoder;
import io.netty.example.factorial.FactorialServerHandler;
import io.netty.example.factorial.NumberEncoder;
import io.netty.example.http.snoop.HttpSnoopServerHandler;
import io.netty.handler.codec.ByteToMessageDecoder;
import io.netty.handler.codec.compression.ZlibCodecFactory;
import io.netty.handler.codec.compression.ZlibWrapper;
import io.netty.handler.codec.http.HttpContentCompressor;
import io.netty.handler.codec.http.HttpRequestDecoder;
import io.netty.handler.codec.http.HttpResponseEncoder;
import io.netty.handler.ssl.SslContext;
import io.netty.handler.ssl.SslHandler;

import java.util.List;

/**
 * Manipulates the current pipeline dynamically to switch protocols or enable
 * SSL or GZIP.
 */
public class PortUnificationServerHandler extends ByteToMessageDecoder {

    private final SslContext sslCtx;
    private final boolean detectSsl;
    private final boolean detectGzip;

    public PortUnificationServerHandler(SslContext sslCtx) {
        this(sslCtx, true, true);
    }

    private PortUnificationServerHandler(SslContext sslCtx, boolean detectSsl, boolean detectGzip) {
        this.sslCtx = sslCtx;
        this.detectSsl = detectSsl;
        this.detectGzip = detectGzip;
    }

    @Override
    protected void decode(ChannelHandlerContext ctx, ByteBuf in, List out) throws Exception {
        // Will use the first five bytes to detect a protocol.
        if (in.readableBytes() < 5) {
            return;
        }

        if (isSsl(in)) {
            enableSsl(ctx);
        } else {
            final int magic1 = in.getUnsignedByte(in.readerIndex());
            final int magic2 = in.getUnsignedByte(in.readerIndex() + 1);
            if (isGzip(magic1, magic2)) {
                enableGzip(ctx);
            } else if (isHttp(magic1, magic2)) {
                switchToHttp(ctx);
            } else if (isFactorial(magic1)) {
                switchToFactorial(ctx);
            } else {
                // Unknown protocol; discard everything and close the connection.
                in.clear();
                ctx.close();
            }
        }
    }

    private boolean isSsl(ByteBuf buf) {
        if (detectSsl) {
            return SslHandler.isEncrypted(buf);
        }
        return false;
    }

    private boolean isGzip(int magic1, int magic2) {
        if (detectGzip) {
            return magic1 == 31 && magic2 == 139;
        }
        return false;
    }

    private static boolean isHttp(int magic1, int magic2) {
        return
            magic1 == 'G' && magic2 == 'E' || // GET
            magic1 == 'P' && magic2 == 'O' || // POST
            magic1 == 'P' && magic2 == 'U' || // PUT
            magic1 == 'H' && magic2 == 'E' || // HEAD
            magic1 == 'O' && magic2 == 'P' || // OPTIONS
            magic1 == 'P' && magic2 == 'A' || // PATCH
            magic1 == 'D' && magic2 == 'E' || // DELETE
            magic1 == 'T' && magic2 == 'R' || // TRACE
            magic1 == 'C' && magic2 == 'O';   // CONNECT
    }

    private static boolean isFactorial(int magic1) {
        return magic1 == 'F';
    }

    private void enableSsl(ChannelHandlerContext ctx) {
        ChannelPipeline p = ctx.pipeline();
        p.addLast("ssl", sslCtx.newHandler(ctx.alloc()));
        p.addLast("unificationA", new PortUnificationServerHandler(sslCtx, false, detectGzip));
        p.remove(this);
    }

    private void enableGzip(ChannelHandlerContext ctx) {
        ChannelPipeline p = ctx.pipeline();
        p.addLast("gzipdeflater", ZlibCodecFactory.newZlibEncoder(ZlibWrapper.GZIP));
        p.addLast("gzipinflater", ZlibCodecFactory.newZlibDecoder(ZlibWrapper.GZIP));
        p.addLast("unificationB", new PortUnificationServerHandler(sslCtx, detectSsl, false));
        p.remove(this);
    }

    private void switchToHttp(ChannelHandlerContext ctx) {
        ChannelPipeline p = ctx.pipeline();
        p.addLast("decoder", new HttpRequestDecoder());
        p.addLast("encoder", new HttpResponseEncoder());
        p.addLast("deflater", new HttpContentCompressor());
        p.addLast("handler", new HttpSnoopServerHandler());
        p.remove(this);
    }

    private void switchToFactorial(ChannelHandlerContext ctx) {
        ChannelPipeline p = ctx.pipeline();
        p.addLast("decoder", new BigIntegerDecoder());
        p.addLast("encoder", new NumberEncoder());
        p.addLast("handler", new FactorialServerHandler());
        p.remove(this);
    }
}
    
    
    
    

    




    
    
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