143 lines
5.1 KiB
Java
143 lines
5.1 KiB
Java
/*
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* Copyright 2012 The Netty Project
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*
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* The Netty Project licenses this file to you under the Apache License,
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* version 2.0 (the "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*/
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package io.netty.example.portunification;
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import io.netty.buffer.ByteBuf;
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import io.netty.channel.ChannelHandlerContext;
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import io.netty.channel.ChannelPipeline;
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import io.netty.example.factorial.BigIntegerDecoder;
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import io.netty.example.factorial.FactorialServerHandler;
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import io.netty.example.factorial.NumberEncoder;
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import io.netty.example.http.snoop.HttpSnoopServerHandler;
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import io.netty.handler.codec.ByteToMessageDecoder;
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import io.netty.handler.codec.compression.ZlibCodecFactory;
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import io.netty.handler.codec.compression.ZlibWrapper;
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import io.netty.handler.codec.http.HttpContentCompressor;
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import io.netty.handler.codec.http.HttpRequestDecoder;
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import io.netty.handler.codec.http.HttpResponseEncoder;
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import io.netty.handler.ssl.SslContext;
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import io.netty.handler.ssl.SslHandler;
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/**
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* Manipulates the current pipeline dynamically to switch protocols or enable
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* SSL or GZIP.
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*/
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public class PortUnificationServerHandler extends ByteToMessageDecoder {
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private final SslContext sslCtx;
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private final boolean detectSsl;
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private final boolean detectGzip;
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public PortUnificationServerHandler(SslContext sslCtx) {
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this(sslCtx, true, true);
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}
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private PortUnificationServerHandler(SslContext sslCtx, boolean detectSsl, boolean detectGzip) {
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this.sslCtx = sslCtx;
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this.detectSsl = detectSsl;
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this.detectGzip = detectGzip;
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}
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@Override
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protected void decode(ChannelHandlerContext ctx, ByteBuf in) throws Exception {
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// Will use the first five bytes to detect a protocol.
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if (in.readableBytes() < 5) {
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return;
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}
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if (isSsl(in)) {
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enableSsl(ctx);
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} else {
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final int magic1 = in.getUnsignedByte(in.readerIndex());
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final int magic2 = in.getUnsignedByte(in.readerIndex() + 1);
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if (isGzip(magic1, magic2)) {
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enableGzip(ctx);
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} else if (isHttp(magic1, magic2)) {
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switchToHttp(ctx);
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} else if (isFactorial(magic1)) {
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switchToFactorial(ctx);
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} else {
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// Unknown protocol; discard everything and close the connection.
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in.clear();
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ctx.close();
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}
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}
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}
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private boolean isSsl(ByteBuf buf) {
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if (detectSsl) {
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return SslHandler.isEncrypted(buf);
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}
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return false;
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}
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private boolean isGzip(int magic1, int magic2) {
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if (detectGzip) {
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return magic1 == 31 && magic2 == 139;
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}
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return false;
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}
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private static boolean isHttp(int magic1, int magic2) {
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return
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magic1 == 'G' && magic2 == 'E' || // GET
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magic1 == 'P' && magic2 == 'O' || // POST
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magic1 == 'P' && magic2 == 'U' || // PUT
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magic1 == 'H' && magic2 == 'E' || // HEAD
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magic1 == 'O' && magic2 == 'P' || // OPTIONS
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magic1 == 'P' && magic2 == 'A' || // PATCH
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magic1 == 'D' && magic2 == 'E' || // DELETE
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magic1 == 'T' && magic2 == 'R' || // TRACE
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magic1 == 'C' && magic2 == 'O'; // CONNECT
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}
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private static boolean isFactorial(int magic1) {
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return magic1 == 'F';
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}
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private void enableSsl(ChannelHandlerContext ctx) {
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ChannelPipeline p = ctx.pipeline();
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p.addLast("ssl", sslCtx.newHandler(ctx.alloc()));
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p.addLast("unificationA", new PortUnificationServerHandler(sslCtx, false, detectGzip));
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p.remove(this);
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}
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private void enableGzip(ChannelHandlerContext ctx) {
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ChannelPipeline p = ctx.pipeline();
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p.addLast("gzipdeflater", ZlibCodecFactory.newZlibEncoder(ZlibWrapper.GZIP));
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p.addLast("gzipinflater", ZlibCodecFactory.newZlibDecoder(ZlibWrapper.GZIP));
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p.addLast("unificationB", new PortUnificationServerHandler(sslCtx, detectSsl, false));
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p.remove(this);
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}
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private void switchToHttp(ChannelHandlerContext ctx) {
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ChannelPipeline p = ctx.pipeline();
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p.addLast("decoder", new HttpRequestDecoder());
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p.addLast("encoder", new HttpResponseEncoder());
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p.addLast("deflater", new HttpContentCompressor());
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p.addLast("handler", new HttpSnoopServerHandler());
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p.remove(this);
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}
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private void switchToFactorial(ChannelHandlerContext ctx) {
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ChannelPipeline p = ctx.pipeline();
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p.addLast("decoder", new BigIntegerDecoder());
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p.addLast("encoder", new NumberEncoder());
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p.addLast("handler", new FactorialServerHandler());
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p.remove(this);
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}
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}
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