168 lines
4.9 KiB
Java
168 lines
4.9 KiB
Java
/*
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* Copyright 2011 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.channel.Channel;
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import io.netty.channel.ChannelFuture;
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import io.netty.handler.codec.http.HttpRequest;
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import java.util.LinkedHashSet;
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import java.util.Set;
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/**
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* Base class for server side web socket opening and closing handshakes
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*/
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public abstract class WebSocketServerHandshaker {
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private final String webSocketUrl;
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private final String[] subprotocols;
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private final WebSocketVersion version;
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private final int maxFramePayloadLength;
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private String selectedSubprotocol;
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/**
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* Constructor specifying the destination web socket location
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*
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* @param version
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* the protocol version
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* @param webSocketUrl
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* URL for web socket communications. e.g "ws://myhost.com/mypath". Subsequent web socket frames will be
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* sent to this URL.
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* @param subprotocols
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* CSV of supported protocols. Null if sub protocols not supported.
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* @param maxFramePayloadLength
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* Maximum length of a frame's payload
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*/
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protected WebSocketServerHandshaker(
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WebSocketVersion version, String webSocketUrl, String subprotocols,
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int maxFramePayloadLength) {
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this.version = version;
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this.webSocketUrl = webSocketUrl;
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if (subprotocols != null) {
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String[] subprotocolArray = subprotocols.split(",");
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for (int i = 0; i < subprotocolArray.length; i++) {
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subprotocolArray[i] = subprotocolArray[i].trim();
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}
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this.subprotocols = subprotocolArray;
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} else {
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this.subprotocols = new String[0];
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}
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this.maxFramePayloadLength = maxFramePayloadLength;
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}
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/**
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* Returns the URL of the web socket
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*/
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public String getWebSocketUrl() {
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return webSocketUrl;
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}
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/**
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* Returns the CSV of supported sub protocols
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*/
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public Set<String> getSubprotocols() {
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Set<String> ret = new LinkedHashSet<String>();
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for (String p: subprotocols) {
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ret.add(p);
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}
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return ret;
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}
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/**
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* Returns the version of the specification being supported
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*/
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public WebSocketVersion getVersion() {
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return version;
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}
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/**
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<<<<<<< HEAD
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* Returns the max length for any frame's payload.
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=======
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* Returns the max length for any frame's payload
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>>>>>>> abd10d9... Fixed bug where subprotocol not sent by client
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*/
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public int getMaxFramePayloadLength() {
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return maxFramePayloadLength;
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}
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/**
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* Performs the opening handshake
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*
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* @param channel
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* Channel
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* @param req
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* HTTP Request
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*/
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public abstract ChannelFuture handshake(Channel channel, HttpRequest req);
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/**
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* Performs the closing handshake
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*
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* @param channel
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* Channel
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* @param frame
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* Closing Frame that was received
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*/
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public abstract ChannelFuture close(Channel channel, CloseWebSocketFrame frame);
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/**
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* Selects the first matching supported sub protocol
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*
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* @param requestedSubprotocols
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* CSV of protocols to be supported. e.g. "chat, superchat"
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* @return First matching supported sub protocol. Null if not found.
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*/
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protected String selectSubprotocol(String requestedSubprotocols) {
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if (requestedSubprotocols == null || subprotocols.length == 0) {
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return null;
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}
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String[] requestedSubprotocolArray = requestedSubprotocols.split(",");
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for (String p: requestedSubprotocolArray) {
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String requestedSubprotocol = p.trim();
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for (String supportedSubprotocol: subprotocols) {
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if (requestedSubprotocol.equals(supportedSubprotocol)) {
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return requestedSubprotocol;
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}
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}
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}
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// No match found
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return null;
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}
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/**
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* Returns the selected subprotocol. Null if no subprotocol has been selected.
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* <p>
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* This is only available AFTER <tt>handshake()</tt> has been called.
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* </p>
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*/
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public String getSelectedSubprotocol() {
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return selectedSubprotocol;
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}
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protected void setSelectedSubprotocol(String value) {
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selectedSubprotocol = value;
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}
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}
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