WebSocket enhancements

- Refactoring and adding suggestions from Norman and Vibul.

codec-http/src/main/java/io/netty/handler/codec/http/websocketx/WebSocketServerHandshakeHandler.java

@@ -0,0 +1,99 @@
+/*
+ * 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.handler.codec.http.websocketx;
+
+import static io.netty.handler.codec.http.HttpHeaders.isKeepAlive;
+import static io.netty.handler.codec.http.HttpMethod.GET;
+import static io.netty.handler.codec.http.HttpResponseStatus.FORBIDDEN;
+import static io.netty.handler.codec.http.HttpVersion.HTTP_1_1;
+import io.netty.channel.ChannelFuture;
+import io.netty.channel.ChannelFutureListener;
+import io.netty.channel.ChannelHandlerContext;
+import io.netty.channel.ChannelInboundMessageHandlerAdapter;
+import io.netty.handler.codec.http.DefaultHttpResponse;
+import io.netty.handler.codec.http.HttpHeaders;
+import io.netty.handler.codec.http.HttpRequest;
+import io.netty.handler.codec.http.HttpResponse;
+import io.netty.logging.InternalLogger;
+import io.netty.logging.InternalLoggerFactory;
+
+/**
+ * Handles the HTTP handshake (the HTTP Upgrade request)
+ */
+class WebSocketServerHandshakeHandler extends ChannelInboundMessageHandlerAdapter<HttpRequest> {
+
+    private static final InternalLogger logger =
+            InternalLoggerFactory.getInstance(WebSocketServerHandshakeHandler.class);
+    private final String websocketPath;
+    private final String subprotocols;
+    private final boolean allowExtensions;
+
+    public WebSocketServerHandshakeHandler(String websocketPath, String subprotocols, boolean allowExtensions) {
+        this.websocketPath = websocketPath;
+        this.subprotocols = subprotocols;
+        this.allowExtensions = allowExtensions;
+    }
+
+    @Override
+    public void messageReceived(final ChannelHandlerContext ctx, HttpRequest req) throws Exception {
+        if (req.getMethod() != GET) {
+            sendHttpResponse(ctx, req, new DefaultHttpResponse(HTTP_1_1, FORBIDDEN));
+            return;
+        }
+
+        final WebSocketServerHandshakerFactory wsFactory = new WebSocketServerHandshakerFactory(
+                getWebSocketLocation(req, websocketPath), subprotocols, allowExtensions);
+        final WebSocketServerHandshaker handshaker = wsFactory.newHandshaker(req);
+        if (handshaker == null) {
+            wsFactory.sendUnsupportedWebSocketVersionResponse(ctx.channel());
+        } else {
+            try {
+                final ChannelFuture handshakeFuture = handshaker.handshake(ctx.channel(), req);
+                handshakeFuture.addListener(new ChannelFutureListener() {
+                    @Override
+                    public void operationComplete(ChannelFuture future) throws Exception {
+                        if (!future.isSuccess()) {
+                            ctx.fireExceptionCaught(future.cause());
+                        }
+                    }
+                });
+                WebSocketServerProtocolHandler.setHandshaker(ctx, handshaker);
+                ctx.pipeline().replace(this, "WS403Responder",
+                    WebSocketServerProtocolHandler.forbiddenHttpRequestResponder());
+            } catch (WebSocketHandshakeException e) {
+                ctx.fireExceptionCaught(e);
+            }
+        }
+    }
+
+    @Override
+    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
+        logger.error("Exception Caught", cause);
+        ctx.close();
+    }
+
+    private static void sendHttpResponse(ChannelHandlerContext ctx, HttpRequest req, HttpResponse res) {
+        ChannelFuture f = ctx.channel().write(res);
+        if (!isKeepAlive(req) || res.getStatus().getCode() != 200) {
+            f.addListener(ChannelFutureListener.CLOSE);
+        }
+    }
+
+    private static String getWebSocketLocation(HttpRequest req, String path) {
+        return "ws://" + req.getHeader(HttpHeaders.Names.HOST) + path;
+    }
+
+}

codec-http/src/main/java/io/netty/handler/codec/http/websocketx/WebSocketServerProtocolHandler.java

@@ -0,0 +1,112 @@
+/*
+ * 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.handler.codec.http.websocketx;
+
+import static io.netty.handler.codec.http.HttpVersion.HTTP_1_1;
+import io.netty.buffer.Unpooled;
+import io.netty.channel.ChannelHandler;
+import io.netty.channel.ChannelHandlerContext;
+import io.netty.channel.ChannelInboundMessageHandlerAdapter;
+import io.netty.handler.codec.http.DefaultHttpResponse;
+import io.netty.handler.codec.http.HttpResponseStatus;
+import io.netty.util.AttributeKey;
+
+/**
+ * Handles WebSocket control frames (Close, Ping, Pong) and data frames (Text and Binary) are passed
+ * to the next handler in the pipeline.
+ */
+public class WebSocketServerProtocolHandler extends ChannelInboundMessageHandlerAdapter<WebSocketFrame> {
+
+    private static final AttributeKey<WebSocketServerHandshaker> HANDSHAKER_ATTR_KEY =
+            new AttributeKey<WebSocketServerHandshaker>(WebSocketServerHandshaker.class.getName());
+
+    private final String websocketPath;
+    private final String subprotocols;
+    private final boolean allowExtensions;
+
+    public WebSocketServerProtocolHandler(String websocketPath) {
+        this(websocketPath, null, false);
+    }
+
+    public WebSocketServerProtocolHandler(String websocketPath, String subprotocols) {
+        this(websocketPath, subprotocols, false);
+    }
+
+    public WebSocketServerProtocolHandler(String websocketPath, String subprotocols, boolean allowExtensions) {
+        this.websocketPath = websocketPath;
+        this.subprotocols = subprotocols;
+        this.allowExtensions = allowExtensions;
+    }
+
+    @Override
+    public void afterAdd(ChannelHandlerContext ctx) {
+        // Add the WebSocketHandshakeHandler before this one.
+        ctx.pipeline().addBefore(ctx.name(), WebSocketServerHandshakeHandler.class.getName(),
+                new WebSocketServerHandshakeHandler(websocketPath, subprotocols, allowExtensions));
+    }
+
+    @Override
+    public void messageReceived(ChannelHandlerContext ctx, WebSocketFrame frame) throws Exception {
+        if (frame instanceof CloseWebSocketFrame) {
+            WebSocketServerHandshaker handshaker = WebSocketServerProtocolHandler.getHandshaker(ctx);
+            handshaker.close(ctx.channel(), (CloseWebSocketFrame) frame);
+            return;
+        } else if (frame instanceof PingWebSocketFrame) {
+            ctx.channel().write(new PongWebSocketFrame(frame.getBinaryData()));
+            return;
+        }
+
+        ctx.nextInboundMessageBuffer().add(frame);
+        ctx.fireInboundBufferUpdated();
+    }
+
+    @Override
+    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
+        try {
+            if (cause instanceof WebSocketHandshakeException) {
+                DefaultHttpResponse response = new DefaultHttpResponse(HTTP_1_1, HttpResponseStatus.BAD_REQUEST);
+                response.setContent(Unpooled.wrappedBuffer(cause.getMessage().getBytes()));
+                ctx.channel().write(response);
+            }
+        } finally {
+            ctx.close();
+        }
+    }
+
+    static WebSocketServerHandshaker getHandshaker(ChannelHandlerContext ctx) {
+        return ctx.attr(HANDSHAKER_ATTR_KEY).get();
+    }
+
+    static void setHandshaker(ChannelHandlerContext ctx, WebSocketServerHandshaker handshaker) {
+        ctx.attr(HANDSHAKER_ATTR_KEY).set(handshaker);
+    }
+
+    static ChannelHandler forbiddenHttpRequestResponder() {
+        return new ChannelInboundMessageHandlerAdapter<Object>() {
+            @Override
+            public void messageReceived(ChannelHandlerContext ctx, Object msg) throws Exception {
+                if (!(msg instanceof WebSocketFrame)) {
+                    DefaultHttpResponse response = new DefaultHttpResponse(HTTP_1_1, HttpResponseStatus.FORBIDDEN);
+                    ctx.channel().write(response);
+                } else {
+                    ctx.nextInboundMessageBuffer().add(msg);
+                    ctx.fireInboundBufferUpdated();
+                }
+            }
+        };
+    }
+
+}

codec-http/src/test/java/io/netty/handler/codec/http/websocketx/WebSocketRequestBuilder.java

@@ -0,0 +1,131 @@
+/*
+ * 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.handler.codec.http.websocketx;
+
+import static io.netty.handler.codec.http.HttpHeaders.Values.WEBSOCKET;
+import static io.netty.handler.codec.http.HttpVersion.HTTP_1_1;
+import io.netty.handler.codec.http.DefaultHttpRequest;
+import io.netty.handler.codec.http.HttpMethod;
+import io.netty.handler.codec.http.HttpRequest;
+import io.netty.handler.codec.http.HttpVersion;
+import io.netty.handler.codec.http.HttpHeaders.Names;
+
+public class WebSocketRequestBuilder {
+
+    private HttpVersion httpVersion;
+    private HttpMethod method;
+    private String uri;
+    private String host;
+    private String upgrade;
+    private String connection;
+    private String key;
+    private String origin;
+    private WebSocketVersion version;
+
+    public WebSocketRequestBuilder httpVersion(HttpVersion httpVersion) {
+        this.httpVersion = httpVersion;
+        return this;
+    }
+
+    public WebSocketRequestBuilder method(HttpMethod method) {
+        this.method = method;
+        return this;
+    }
+
+    public WebSocketRequestBuilder uri(String uri) {
+        this.uri = uri;
+        return this;
+    }
+
+    public WebSocketRequestBuilder host(String host) {
+        this.host = host;
+        return this;
+    }
+
+    public WebSocketRequestBuilder upgrade(String upgrade) {
+        this.upgrade = upgrade;
+        return this;
+    }
+
+    public WebSocketRequestBuilder connection(String connection) {
+        this.connection = connection;
+        return this;
+    }
+
+    public WebSocketRequestBuilder key(String key) {
+        this.key = key;
+        return this;
+    }
+
+    public WebSocketRequestBuilder origin(String origin) {
+        this.origin = origin;
+        return this;
+    }
+
+    public WebSocketRequestBuilder version13() {
+        this.version = WebSocketVersion.V13;
+        return this;
+    }
+
+    public WebSocketRequestBuilder version8() {
+        this.version = WebSocketVersion.V08;
+        return this;
+    }
+
+    public WebSocketRequestBuilder version00() {
+        this.version = null;
+        return this;
+    }
+
+    public WebSocketRequestBuilder noVersion() {
+        return this;
+    }
+
+    public HttpRequest build() {
+        HttpRequest req = new DefaultHttpRequest(httpVersion, method, uri);
+        if (host != null) {
+            req.setHeader(Names.HOST, host);
+        }
+        if (upgrade != null) {
+            req.setHeader(Names.UPGRADE, upgrade);
+        }
+        if (connection != null) {
+            req.setHeader(Names.CONNECTION, connection);
+        }
+        if (key != null) {
+            req.setHeader(Names.SEC_WEBSOCKET_KEY, key);
+        }
+        if (origin != null) {
+            req.setHeader(Names.SEC_WEBSOCKET_ORIGIN, origin);
+        }
+        if (version != null) {
+            req.setHeader(Names.SEC_WEBSOCKET_VERSION, version.toHttpHeaderValue());
+        }
+        return req;
+    }
+
+    public static HttpRequest sucessful() {
+        return new WebSocketRequestBuilder().httpVersion(HTTP_1_1)
+                .method(HttpMethod.GET)
+                .uri("/test")
+                .host("server.example.com")
+                .upgrade(WEBSOCKET.toLowerCase())
+                .key("dGhlIHNhbXBsZSBub25jZQ==")
+                .origin("http://example.com")
+                .version13()
+                .build();
+    }
+}