/*
* JBoss, Home of Professional Open Source.
* Copyright 2012 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.websockets.jsr;
import io.undertow.servlet.websockets.ServletWebSocketHttpExchange;
import io.undertow.util.Headers;
import io.undertow.util.PathTemplateMatcher;
import io.undertow.websockets.core.handler.WebSocketConnectionCallback;
import io.undertow.websockets.core.protocol.Handshake;
import io.undertow.websockets.jsr.handshake.HandshakeUtil;
import io.undertow.websockets.jsr.handshake.JsrHybi07Handshake;
import io.undertow.websockets.jsr.handshake.JsrHybi08Handshake;
import io.undertow.websockets.jsr.handshake.JsrHybi13Handshake;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.websocket.server.ServerContainer;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
/**
* Filter that provides HTTP upgrade functionality. This should be run after all user filters, but before any servlets.
* <p/>
* The use of a filter rather than a servlet allows for normal HTTP requests to be served from the same location
* as a web socket endpoint if no upgrade header is found.
* <p/>
* TODO: this needs a lot of work
*
* @author Stuart Douglas
*/
public class JsrWebSocketFilter implements Filter {
private WebSocketConnectionCallback callback;
private PathTemplateMatcher<WebSocketHandshakeHolder> pathTemplateMatcher;
protected WebSocketHandshakeHolder handshakes(ConfiguredServerEndpoint config) {
List<Handshake> handshakes = new ArrayList<Handshake>();
handshakes.add(new JsrHybi13Handshake(config));
handshakes.add(new JsrHybi08Handshake(config));
handshakes.add(new JsrHybi07Handshake(config));
return new WebSocketHandshakeHolder(handshakes, config);
}
@Override
public void init(final FilterConfig filterConfig) throws ServletException {
ServerWebSocketContainer container = (ServerWebSocketContainer) filterConfig.getServletContext().getAttribute(ServerContainer.class.getName());
container.deploymentComplete();
pathTemplateMatcher = new PathTemplateMatcher<WebSocketHandshakeHolder>();
for (ConfiguredServerEndpoint endpoint : container.getConfiguredServerEndpoints()) {
pathTemplateMatcher.add(endpoint.getPathTemplate(), handshakes(endpoint));
}
this.callback = new EndpointSessionHandler(container);
}
@Override
public void doFilter(final ServletRequest request, final ServletResponse response, final FilterChain chain) throws IOException, ServletException {
HttpServletRequest req = (HttpServletRequest) request;
HttpServletResponse resp = (HttpServletResponse) response;
if (req.getHeader(Headers.UPGRADE_STRING) != null) {
final ServletWebSocketHttpExchange facade = new ServletWebSocketHttpExchange(req, resp);
String path;
if (req.getPathInfo() == null) {
path = req.getServletPath();
} else {
path = req.getServletPath() + req.getPathInfo();
}
if (!path.startsWith("/")) {
path = "/" + path;
}
PathTemplateMatcher.PathMatchResult<WebSocketHandshakeHolder> matchResult = pathTemplateMatcher.match(path);
if (matchResult != null) {
Handshake handshaker = null;
for (Handshake method : matchResult.getValue().handshakes) {
if (method.matches(facade)) {
handshaker = method;
break;
}
}
if (handshaker == null) {
chain.doFilter(request, response);
} else {
facade.putAttachment(HandshakeUtil.PATH_PARAMS, matchResult.getParameters());
handshaker.handshake(facade, callback);
return;
}
}
chain.doFilter(request, response);
} else {
chain.doFilter(request, response);
}
}
@Override
public void destroy() {
}
private static final class WebSocketHandshakeHolder {
final List<Handshake> handshakes;
final ConfiguredServerEndpoint endpoint;
private WebSocketHandshakeHolder(List<Handshake> handshakes, ConfiguredServerEndpoint endpoint) {
this.handshakes = handshakes;
this.endpoint = endpoint;
}
}
}