/*
* JBoss, Home of Professional Open Source.
* Copyright 2014 Red Hat, Inc., and individual contributors
* as indicated by the @author tags.
*
* Licensed 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.undertow.servlet.websockets;
import io.undertow.UndertowLogger;
import io.undertow.server.HttpServerExchange;
import io.undertow.server.HttpUpgradeListener;
import io.undertow.servlet.UndertowServletMessages;
import io.undertow.util.StatusCodes;
import io.undertow.websockets.WebSocketConnectionCallback;
import io.undertow.websockets.core.WebSocketChannel;
import io.undertow.websockets.core.protocol.Handshake;
import io.undertow.websockets.core.protocol.version07.Hybi07Handshake;
import io.undertow.websockets.core.protocol.version08.Hybi08Handshake;
import io.undertow.websockets.core.protocol.version13.Hybi13Handshake;
import org.xnio.StreamConnection;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
/**
* @author Stuart Douglas
*/
public class WebSocketServlet extends HttpServlet {
public static final String SESSION_HANDLER = "io.undertow.handler";
private final List<Handshake> handshakes;
private WebSocketConnectionCallback callback;
private Set<WebSocketChannel> peerConnections;
public WebSocketServlet() {
this.handshakes = handshakes();
}
public WebSocketServlet(WebSocketConnectionCallback callback) {
this.callback = callback;
this.handshakes = handshakes();
}
@Override
public void init(final ServletConfig config) throws ServletException {
super.init(config);
peerConnections = Collections.newSetFromMap(new ConcurrentHashMap<WebSocketChannel, Boolean>());
try {
final String sessionHandler = config.getInitParameter(SESSION_HANDLER);
if (sessionHandler != null) {
final Class<?> clazz = Class.forName(sessionHandler, true, Thread.currentThread().getContextClassLoader());
final Object handler = clazz.newInstance();
this.callback = (WebSocketConnectionCallback) handler;
}
//TODO: set properties based on init params
} catch (ClassNotFoundException e) {
throw new ServletException(e);
} catch (InstantiationException e) {
throw new ServletException(e);
} catch (IllegalAccessException e) {
throw new ServletException(e);
}
if (callback == null) {
throw UndertowServletMessages.MESSAGES.noWebSocketHandler();
}
}
@Override
protected void doGet(final HttpServletRequest req, final HttpServletResponse resp) throws ServletException, IOException {
final ServletWebSocketHttpExchange facade = new ServletWebSocketHttpExchange(req, resp, peerConnections);
Handshake handshaker = null;
for (Handshake method : handshakes) {
if (method.matches(facade)) {
handshaker = method;
break;
}
}
if (handshaker == null) {
UndertowLogger.REQUEST_LOGGER.debug("Could not find hand shaker for web socket request");
resp.sendError(StatusCodes.BAD_REQUEST);
return;
}
final Handshake selected = handshaker;
facade.upgradeChannel(new HttpUpgradeListener() {
@Override
public void handleUpgrade(StreamConnection streamConnection, HttpServerExchange exchange) {
WebSocketChannel channel = selected.createChannel(facade, streamConnection, facade.getBufferPool());
peerConnections.add(channel);
callback.onConnect(facade, channel);
}
});
handshaker.handshake(facade);
}
protected List<Handshake> handshakes() {
List<Handshake> handshakes = new ArrayList<>();
handshakes.add(new Hybi13Handshake());
handshakes.add(new Hybi08Handshake());
handshakes.add(new Hybi07Handshake());
return handshakes;
}
}