/*
* Copyright 2002-2014 the original author or authors.
*
* 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 org.springframework.web.socket.server.support;
import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.http.server.ServerHttpRequest;
import org.springframework.http.server.ServerHttpResponse;
import org.springframework.http.server.ServletServerHttpRequest;
import org.springframework.http.server.ServletServerHttpResponse;
import org.springframework.util.Assert;
import org.springframework.web.HttpRequestHandler;
import org.springframework.web.socket.WebSocketHandler;
import org.springframework.web.socket.handler.ExceptionWebSocketHandlerDecorator;
import org.springframework.web.socket.handler.LoggingWebSocketHandlerDecorator;
import org.springframework.web.socket.server.HandshakeFailureException;
import org.springframework.web.socket.server.HandshakeHandler;
import org.springframework.web.socket.server.HandshakeInterceptor;
/**
* A {@link HttpRequestHandler} for processing WebSocket handshake requests.
*
* <p>This is the main class to use when configuring a server WebSocket at a specific URL.
* It is a very thin wrapper around a {@link WebSocketHandler} and a {@link HandshakeHandler},
* also adapting the {@link HttpServletRequest} and {@link HttpServletResponse} to
* {@link ServerHttpRequest} and {@link ServerHttpResponse}, respectively.
*
* @author Rossen Stoyanchev
* @since 4.0
*/
public class WebSocketHttpRequestHandler implements HttpRequestHandler {
private final Log logger = LogFactory.getLog(WebSocketHttpRequestHandler.class);
private final WebSocketHandler wsHandler;
private final HandshakeHandler handshakeHandler;
private final List<HandshakeInterceptor> interceptors = new ArrayList<HandshakeInterceptor>();
public WebSocketHttpRequestHandler(WebSocketHandler wsHandler) {
this(wsHandler, new DefaultHandshakeHandler());
}
public WebSocketHttpRequestHandler(WebSocketHandler wsHandler, HandshakeHandler handshakeHandler) {
Assert.notNull(wsHandler, "wsHandler must not be null");
Assert.notNull(handshakeHandler, "handshakeHandler must not be null");
this.wsHandler = new ExceptionWebSocketHandlerDecorator(new LoggingWebSocketHandlerDecorator(wsHandler));
this.handshakeHandler = handshakeHandler;
}
/**
* Return the WebSocketHandler.
*/
public WebSocketHandler getWebSocketHandler() {
return this.wsHandler;
}
/**
* Return the HandshakeHandler.
*/
public HandshakeHandler getHandshakeHandler() {
return this.handshakeHandler;
}
/**
* Configure one or more WebSocket handshake request interceptors.
*/
public void setHandshakeInterceptors(List<HandshakeInterceptor> interceptors) {
this.interceptors.clear();
if (interceptors != null) {
this.interceptors.addAll(interceptors);
}
}
/**
* Return the configured WebSocket handshake request interceptors.
*/
public List<HandshakeInterceptor> getHandshakeInterceptors() {
return this.interceptors;
}
@Override
public void handleRequest(HttpServletRequest servletRequest, HttpServletResponse servletResponse)
throws ServletException, IOException {
ServerHttpRequest request = new ServletServerHttpRequest(servletRequest);
ServerHttpResponse response = new ServletServerHttpResponse(servletResponse);
HandshakeInterceptorChain chain = new HandshakeInterceptorChain(this.interceptors, this.wsHandler);
HandshakeFailureException failure = null;
try {
if (logger.isDebugEnabled()) {
logger.debug(servletRequest.getMethod() + " " + servletRequest.getRequestURI());
}
Map<String, Object> attributes = new HashMap<String, Object>();
if (!chain.applyBeforeHandshake(request, response, attributes)) {
return;
}
this.handshakeHandler.doHandshake(request, response, this.wsHandler, attributes);
chain.applyAfterHandshake(request, response, null);
response.close();
}
catch (HandshakeFailureException ex) {
failure = ex;
}
catch (Throwable ex) {
failure = new HandshakeFailureException("Uncaught failure for request " + request.getURI(), ex);
}
finally {
if (failure != null) {
chain.applyAfterHandshake(request, response, failure);
throw failure;
}
}
}
}