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Java example source code file (WebSocketServerHandshaker07.java)

This example Java source code file (WebSocketServerHandshaker07.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

charsequence, defaultfullhttpresponse, fullhttpresponse, httpheaders, override, requested, string, websocket07framedecoder, websocket07frameencoder, websocket_07_accept_guid, websocketframedecoder, websocketframeencoder, websockethandshakeexception, websocketserverhandshaker07

The WebSocketServerHandshaker07.java Java example source code

/*
 * 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 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.HttpHeaderNames;
import io.netty.handler.codec.http.HttpHeaderValues;
import io.netty.handler.codec.http.HttpHeaders;
import io.netty.handler.codec.http.HttpResponseStatus;
import io.netty.util.CharsetUtil;

import static io.netty.handler.codec.http.HttpVersion.*;

/**
 * <p>
 * Performs server side opening and closing handshakes for web socket specification version <a
 * href="http://tools.ietf.org/html/draft-ietf-hybi-thewebsocketprotocol-10" >draft-ietf-hybi-thewebsocketprotocol-
 * 10</a>
 * </p>
 */
public class WebSocketServerHandshaker07 extends WebSocketServerHandshaker {

    public static final String WEBSOCKET_07_ACCEPT_GUID = "258EAFA5-E914-47DA-95CA-C5AB0DC85B11";

    private final boolean allowExtensions;
    private final boolean allowMaskMismatch;

    /**
     * Constructor specifying the destination web socket location
     *
     * @param webSocketURL
     *            URL for web socket communications. e.g "ws://myhost.com/mypath".
     *            Subsequent web socket frames will be sent to this URL.
     * @param subprotocols
     *            CSV of supported protocols
     * @param allowExtensions
     *            Allow extensions to be used in the reserved bits of the web socket frame
     * @param maxFramePayloadLength
     *            Maximum allowable frame payload length. Setting this value to your application's
     *            requirement may reduce denial of service attacks using long data frames.
     */
    public WebSocketServerHandshaker07(
            String webSocketURL, String subprotocols, boolean allowExtensions, int maxFramePayloadLength) {
        this(webSocketURL, subprotocols, allowExtensions, maxFramePayloadLength, false);
    }

    /**
     * Constructor specifying the destination web socket location
     *
     * @param webSocketURL
     *            URL for web socket communications. e.g "ws://myhost.com/mypath".
     *            Subsequent web socket frames will be sent to this URL.
     * @param subprotocols
     *            CSV of supported protocols
     * @param allowExtensions
     *            Allow extensions to be used in the reserved bits of the web socket frame
     * @param maxFramePayloadLength
     *            Maximum allowable frame payload length. Setting this value to your application's
     *            requirement may reduce denial of service attacks using long data frames.
     * @param allowMaskMismatch
     *            Allows to loosen the masking requirement on received frames. When this is set to false then also
     *            frames which are not masked properly according to the standard will still be accepted.
     */
    public WebSocketServerHandshaker07(
            String webSocketURL, String subprotocols, boolean allowExtensions, int maxFramePayloadLength,
            boolean allowMaskMismatch) {
        super(WebSocketVersion.V07, webSocketURL, subprotocols, maxFramePayloadLength);
        this.allowExtensions = allowExtensions;
        this.allowMaskMismatch = allowMaskMismatch;
    }

    /**
     * <p>
     * Handle the web socket handshake for the web socket specification <a href=
     * "http://tools.ietf.org/html/draft-ietf-hybi-thewebsocketprotocol-07">HyBi version 7</a>.
     * </p>
     *
     * <p>
     * Browser request to the server:
     * </p>
     *
     * <pre>
     * GET /chat HTTP/1.1
     * Host: server.example.com
     * Upgrade: websocket
     * Connection: Upgrade
     * Sec-WebSocket-Key: dGhlIHNhbXBsZSBub25jZQ==
     * Sec-WebSocket-Origin: http://example.com
     * Sec-WebSocket-Protocol: chat, superchat
     * Sec-WebSocket-Version: 7
     * </pre>
     *
     * <p>
     * Server response:
     * </p>
     *
     * <pre>
     * HTTP/1.1 101 Switching Protocols
     * Upgrade: websocket
     * Connection: Upgrade
     * Sec-WebSocket-Accept: s3pPLMBiTxaQ9kYGzzhZRbK+xOo=
     * Sec-WebSocket-Protocol: chat
     * </pre>
     */
    @Override
    protected FullHttpResponse newHandshakeResponse(FullHttpRequest req, HttpHeaders headers) {

        FullHttpResponse res =
                new DefaultFullHttpResponse(HTTP_1_1, HttpResponseStatus.SWITCHING_PROTOCOLS);

        if (headers != null) {
            res.headers().add(headers);
        }

        CharSequence key = req.headers().get(HttpHeaderNames.SEC_WEBSOCKET_KEY);
        if (key == null) {
            throw new WebSocketHandshakeException("not a WebSocket request: missing key");
        }
        String acceptSeed = key + WEBSOCKET_07_ACCEPT_GUID;
        byte[] sha1 = WebSocketUtil.sha1(acceptSeed.getBytes(CharsetUtil.US_ASCII));
        String accept = WebSocketUtil.base64(sha1);

        if (logger.isDebugEnabled()) {
            logger.debug("WebSocket version 07 server handshake key: {}, response: {}.", key, accept);
        }

        res.headers().add(HttpHeaderNames.UPGRADE, HttpHeaderValues.WEBSOCKET);
        res.headers().add(HttpHeaderNames.CONNECTION, HttpHeaderValues.UPGRADE);
        res.headers().add(HttpHeaderNames.SEC_WEBSOCKET_ACCEPT, accept);

        String subprotocols = req.headers().get(HttpHeaderNames.SEC_WEBSOCKET_PROTOCOL);
        if (subprotocols != null) {
            String selectedSubprotocol = selectSubprotocol(subprotocols);
            if (selectedSubprotocol == null) {
                if (logger.isDebugEnabled()) {
                    logger.debug("Requested subprotocol(s) not supported: {}", subprotocols);
                }
            } else {
                res.headers().add(HttpHeaderNames.SEC_WEBSOCKET_PROTOCOL, selectedSubprotocol);
            }
        }
        return res;
    }

    @Override
    protected WebSocketFrameDecoder newWebsocketDecoder() {
        return new WebSocket07FrameDecoder(true, allowExtensions, maxFramePayloadLength(), allowMaskMismatch);
    }

    @Override
    protected WebSocketFrameEncoder newWebSocketEncoder() {
        return new WebSocket07FrameEncoder(false);
    }
}

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