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Handle only those http requests that equal to adjusted websocket path

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Motivation:

It will be easier to support websockets in server application by using WebSocketServerProtocolHandshakeHandler class and not reinvent its functionality. But currently it handles all http requests as if they were websocket handshake requests.

Modifications:

Check if http request path is equals to adjusted websocket path.
Fixed example of websocket server implementation.

Result:

WebSocketServerProtocolHandshakeHandler handles only websocket handshake requests.
This commit is contained in:
Sergey Polovko 2016-02-28 00:50:11 +03:00 committed by Norman Maurer
parent d2d5bd5501
commit 2e6544fc0e
5 changed files with 167 additions and 160 deletions
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5
codec-http/src/main/java/io/netty/handler/codec/http/websocketx/WebSocketServerProtocolHandshakeHandler.java
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@ -53,6 +53,11 @@ class WebSocketServerProtocolHandshakeHandler
@Override
public void channelRead(final ChannelHandlerContext ctx, Object msg) throws Exception {
FullHttpRequest req = (FullHttpRequest) msg;
if (!websocketPath.equals(req.getUri())) {
ctx.fireChannelRead(msg);
return;
}
try {
if (req.getMethod() != GET) {
sendHttpResponse(ctx, req, new DefaultFullHttpResponse(HTTP_1_1, FORBIDDEN));

48
example/src/main/java/io/netty/example/http/websocketx/server/WebSocketFrameHandler.java Normal file
View File

@ -0,0 +1,48 @@
/*
* 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.http.websocketx.server;
import java.util.Locale;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.SimpleChannelInboundHandler;
import io.netty.handler.codec.http.websocketx.TextWebSocketFrame;
import io.netty.handler.codec.http.websocketx.WebSocketFrame;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Echoes uppercase content of text frames.
*/
public class WebSocketFrameHandler extends SimpleChannelInboundHandler<WebSocketFrame> {
private static final Logger logger = LoggerFactory.getLogger(WebSocketFrameHandler.class);
@Override
protected void channelRead0(ChannelHandlerContext ctx, WebSocketFrame frame) throws Exception {
// ping and pong frames already handled
if (frame instanceof TextWebSocketFrame) {
// Send the uppercase string back.
String request = ((TextWebSocketFrame) frame).text();
logger.info("{} received {}", ctx.channel(), request);
ctx.channel().writeAndFlush(new TextWebSocketFrame(request.toUpperCase(Locale.US)));
} else {
String message = "unsupported frame type: " + frame.getClass().getName();
throw new UnsupportedOperationException(message);
}
}
}

110
example/src/main/java/io/netty/example/http/websocketx/server/WebSocketIndexPageHandler.java Normal file
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@ -0,0 +1,110 @@
/*
* 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.http.websocketx.server;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelFutureListener;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelPipeline;
import io.netty.channel.SimpleChannelInboundHandler;
import io.netty.handler.codec.http.DefaultFullHttpResponse;
import io.netty.handler.codec.http.FullHttpRequest;
import io.netty.handler.codec.http.FullHttpResponse;
import io.netty.handler.codec.http.HttpHeaders;
import io.netty.handler.codec.http.HttpRequest;
import io.netty.handler.ssl.SslHandler;
import io.netty.util.CharsetUtil;
import static io.netty.handler.codec.http.HttpMethod.GET;
import static io.netty.handler.codec.http.HttpResponseStatus.BAD_REQUEST;
import static io.netty.handler.codec.http.HttpResponseStatus.FORBIDDEN;
import static io.netty.handler.codec.http.HttpResponseStatus.NOT_FOUND;
import static io.netty.handler.codec.http.HttpResponseStatus.OK;
import static io.netty.handler.codec.http.HttpVersion.HTTP_1_1;
/**
* Outputs index page content.
*/
public class WebSocketIndexPageHandler extends SimpleChannelInboundHandler<FullHttpRequest> {
private final String websocketPath;
public WebSocketIndexPageHandler(String websocketPath) {
this.websocketPath = websocketPath;
}
@Override
protected void channelRead0(ChannelHandlerContext ctx, FullHttpRequest req) throws Exception {
// Handle a bad request.
if (!req.getDecoderResult().isSuccess()) {
sendHttpResponse(ctx, req, new DefaultFullHttpResponse(HTTP_1_1, BAD_REQUEST));
return;
}
// Allow only GET methods.
if (req.getMethod() != GET) {
sendHttpResponse(ctx, req, new DefaultFullHttpResponse(HTTP_1_1, FORBIDDEN));
return;
}
// Send the index page
if ("/".equals(req.getUri()) || "/index.html".equals(req.getUri())) {
String webSocketLocation = getWebSocketLocation(ctx.pipeline(), req, websocketPath);
ByteBuf content = WebSocketServerIndexPage.getContent(webSocketLocation);
FullHttpResponse res = new DefaultFullHttpResponse(HTTP_1_1, OK, content);
res.headers().set(HttpHeaders.Names.CONTENT_TYPE, "text/html; charset=UTF-8");
HttpHeaders.setContentLength(res, content.readableBytes());
sendHttpResponse(ctx, req, res);
} else {
sendHttpResponse(ctx, req, new DefaultFullHttpResponse(HTTP_1_1, NOT_FOUND));
}
}
@Override
public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
cause.printStackTrace();
ctx.close();
}
private static void sendHttpResponse(ChannelHandlerContext ctx, FullHttpRequest req, FullHttpResponse res) {
// Generate an error page if response getStatus code is not OK (200).
if (res.getStatus().code() != 200) {
ByteBuf buf = Unpooled.copiedBuffer(res.getStatus().toString(), CharsetUtil.UTF_8);
res.content().writeBytes(buf);
buf.release();
HttpHeaders.setContentLength(res, res.content().readableBytes());
}
// Send the response and close the connection if necessary.
ChannelFuture f = ctx.channel().writeAndFlush(res);
if (!HttpHeaders.isKeepAlive(req) || res.getStatus().code() != 200) {
f.addListener(ChannelFutureListener.CLOSE);
}
}
private static String getWebSocketLocation(ChannelPipeline cp, HttpRequest req, String path) {
String protocol = "ws";
if (cp.get(SslHandler.class) != null) {
// SSL in use so use Secure WebSockets
protocol = "wss";
}
return protocol + "://" + req.headers().get(HttpHeaders.Names.HOST) + path;
}
}

159
example/src/main/java/io/netty/example/http/websocketx/server/WebSocketServerHandler.java
View File

@ -1,159 +0,0 @@
/*
* 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.http.websocketx.server;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelFutureListener;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.SimpleChannelInboundHandler;
import io.netty.handler.codec.http.DefaultFullHttpResponse;
import io.netty.handler.codec.http.FullHttpRequest;
import io.netty.handler.codec.http.FullHttpResponse;
import io.netty.handler.codec.http.HttpHeaders;
import io.netty.handler.codec.http.websocketx.CloseWebSocketFrame;
import io.netty.handler.codec.http.websocketx.PingWebSocketFrame;
import io.netty.handler.codec.http.websocketx.PongWebSocketFrame;
import io.netty.handler.codec.http.websocketx.TextWebSocketFrame;
import io.netty.handler.codec.http.websocketx.WebSocketFrame;
import io.netty.handler.codec.http.websocketx.WebSocketServerHandshaker;
import io.netty.handler.codec.http.websocketx.WebSocketServerHandshakerFactory;
import io.netty.util.CharsetUtil;
import static io.netty.handler.codec.http.HttpHeaders.Names.*;
import static io.netty.handler.codec.http.HttpMethod.*;
import static io.netty.handler.codec.http.HttpResponseStatus.*;
import static io.netty.handler.codec.http.HttpVersion.*;
/**
* Handles handshakes and messages
*/
public class WebSocketServerHandler extends SimpleChannelInboundHandler<Object> {
private static final String WEBSOCKET_PATH = "/websocket";
private WebSocketServerHandshaker handshaker;
@Override
public void channelRead0(ChannelHandlerContext ctx, Object msg) {
if (msg instanceof FullHttpRequest) {
handleHttpRequest(ctx, (FullHttpRequest) msg);
} else if (msg instanceof WebSocketFrame) {
handleWebSocketFrame(ctx, (WebSocketFrame) msg);
}
}
@Override
public void channelReadComplete(ChannelHandlerContext ctx) {
ctx.flush();
}
private void handleHttpRequest(ChannelHandlerContext ctx, FullHttpRequest req) {
// Handle a bad request.
if (!req.getDecoderResult().isSuccess()) {
sendHttpResponse(ctx, req, new DefaultFullHttpResponse(HTTP_1_1, BAD_REQUEST));
return;
}
// Allow only GET methods.
if (req.getMethod() != GET) {
sendHttpResponse(ctx, req, new DefaultFullHttpResponse(HTTP_1_1, FORBIDDEN));
return;
}
// Send the demo page and favicon.ico
if ("/".equals(req.getUri())) {
ByteBuf content = WebSocketServerIndexPage.getContent(getWebSocketLocation(req));
FullHttpResponse res = new DefaultFullHttpResponse(HTTP_1_1, OK, content);
res.headers().set(CONTENT_TYPE, "text/html; charset=UTF-8");
HttpHeaders.setContentLength(res, content.readableBytes());
sendHttpResponse(ctx, req, res);
return;
}
if ("/favicon.ico".equals(req.getUri())) {
FullHttpResponse res = new DefaultFullHttpResponse(HTTP_1_1, NOT_FOUND);
sendHttpResponse(ctx, req, res);
return;
}
// Handshake
WebSocketServerHandshakerFactory wsFactory = new WebSocketServerHandshakerFactory(
getWebSocketLocation(req), null, true);
handshaker = wsFactory.newHandshaker(req);
if (handshaker == null) {
WebSocketServerHandshakerFactory.sendUnsupportedVersionResponse(ctx.channel());
} else {
handshaker.handshake(ctx.channel(), req);
}
}
private void handleWebSocketFrame(ChannelHandlerContext ctx, WebSocketFrame frame) {
// Check for closing frame
if (frame instanceof CloseWebSocketFrame) {
handshaker.close(ctx.channel(), (CloseWebSocketFrame) frame.retain());
return;
}
if (frame instanceof PingWebSocketFrame) {
ctx.channel().write(new PongWebSocketFrame(frame.content().retain()));
return;
}
if (!(frame instanceof TextWebSocketFrame)) {
throw new UnsupportedOperationException(String.format("%s frame types not supported", frame.getClass()
.getName()));
}
// Send the uppercase string back.
String request = ((TextWebSocketFrame) frame).text();
System.err.printf("%s received %s%n", ctx.channel(), request);
ctx.channel().write(new TextWebSocketFrame(request.toUpperCase()));
}
private static void sendHttpResponse(
ChannelHandlerContext ctx, FullHttpRequest req, FullHttpResponse res) {
// Generate an error page if response getStatus code is not OK (200).
if (res.getStatus().code() != 200) {
ByteBuf buf = Unpooled.copiedBuffer(res.getStatus().toString(), CharsetUtil.UTF_8);
res.content().writeBytes(buf);
buf.release();
HttpHeaders.setContentLength(res, res.content().readableBytes());
}
// Send the response and close the connection if necessary.
ChannelFuture f = ctx.channel().writeAndFlush(res);
if (!HttpHeaders.isKeepAlive(req) || res.getStatus().code() != 200) {
f.addListener(ChannelFutureListener.CLOSE);
}
}
@Override
public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
cause.printStackTrace();
ctx.close();
}
private static String getWebSocketLocation(FullHttpRequest req) {
String location = req.headers().get(HOST) + WEBSOCKET_PATH;
if (WebSocketServer.SSL) {
return "wss://" + location;
} else {
return "ws://" + location;
}
}
}

5
example/src/main/java/io/netty/example/http/websocketx/server/WebSocketServerInitializer.java
View File

@ -26,6 +26,8 @@ import io.netty.handler.ssl.SslContext;
*/
public class WebSocketServerInitializer extends ChannelInitializer<SocketChannel> {
private static final String WEBSOCKET_PATH = "/websocket";
private final SslContext sslCtx;
public WebSocketServerInitializer(SslContext sslCtx) {
@ -40,6 +42,7 @@ public class WebSocketServerInitializer extends ChannelInitializer<SocketChannel
}
pipeline.addLast(new HttpServerCodec());
pipeline.addLast(new HttpObjectAggregator(65536));
pipeline.addLast(new WebSocketServerHandler());
pipeline.addLast(new WebSocketIndexPageHandler(WEBSOCKET_PATH));
pipeline.addLast(new WebSocketFrameHandler());
}
}