95 lines
3.6 KiB
Java
95 lines
3.6 KiB
Java
/*
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* Copyright 2014 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.handler.codec.http.websocketx;
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import io.netty.buffer.ByteBuf;
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import io.netty.buffer.Unpooled;
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import io.netty.channel.ChannelFutureListener;
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import io.netty.channel.ChannelHandlerContext;
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import io.netty.channel.ChannelInboundHandlerAdapter;
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import io.netty.handler.codec.CorruptedFrameException;
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/**
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*
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*/
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public class Utf8FrameValidator extends ChannelInboundHandlerAdapter {
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private int fragmentedFramesCount;
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private Utf8Validator utf8Validator;
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@Override
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public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
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if (msg instanceof WebSocketFrame) {
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WebSocketFrame frame = (WebSocketFrame) msg;
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// Processing for possible fragmented messages for text and binary
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// frames
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if (((WebSocketFrame) msg).isFinalFragment()) {
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// Final frame of the sequence. Apparently ping frames are
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// allowed in the middle of a fragmented message
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if (!(frame instanceof PingWebSocketFrame)) {
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fragmentedFramesCount = 0;
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// Check text for UTF8 correctness
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if ((frame instanceof TextWebSocketFrame) ||
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(utf8Validator != null && utf8Validator.isChecking())) {
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// Check UTF-8 correctness for this payload
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checkUTF8String(frame.content());
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// This does a second check to make sure UTF-8
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// correctness for entire text message
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utf8Validator.finish();
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}
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}
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} else {
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// Not final frame so we can expect more frames in the
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// fragmented sequence
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if (fragmentedFramesCount == 0) {
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// First text or binary frame for a fragmented set
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if (frame instanceof TextWebSocketFrame) {
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checkUTF8String(frame.content());
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}
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} else {
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// Subsequent frames - only check if init frame is text
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if (utf8Validator != null && utf8Validator.isChecking()) {
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checkUTF8String(frame.content());
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}
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}
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// Increment counter
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fragmentedFramesCount++;
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}
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}
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super.channelRead(ctx, msg);
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}
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private void checkUTF8String(ByteBuf buffer) {
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if (utf8Validator == null) {
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utf8Validator = new Utf8Validator();
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}
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utf8Validator.check(buffer);
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}
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@Override
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public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
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if (cause instanceof CorruptedFrameException && ctx.channel().isOpen()) {
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ctx.writeAndFlush(Unpooled.EMPTY_BUFFER).addListener(ChannelFutureListener.CLOSE);
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}
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super.exceptionCaught(ctx, cause);
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}
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}
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