/*
* 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.sockjs.transport;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ScheduledFuture;
import org.springframework.http.HttpMethod;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.ServerHttpRequest;
import org.springframework.http.server.ServerHttpResponse;
import org.springframework.scheduling.TaskScheduler;
import org.springframework.util.Assert;
import org.springframework.util.ClassUtils;
import org.springframework.util.CollectionUtils;
import org.springframework.web.socket.WebSocketHandler;
import org.springframework.web.socket.server.HandshakeFailureException;
import org.springframework.web.socket.server.HandshakeHandler;
import org.springframework.web.socket.server.HandshakeInterceptor;
import org.springframework.web.socket.server.support.HandshakeInterceptorChain;
import org.springframework.web.socket.sockjs.SockJsException;
import org.springframework.web.socket.sockjs.frame.Jackson2SockJsMessageCodec;
import org.springframework.web.socket.sockjs.frame.SockJsMessageCodec;
import org.springframework.web.socket.sockjs.support.AbstractSockJsService;
/**
* A basic implementation of {@link org.springframework.web.socket.sockjs.SockJsService}
* with support for SPI-based transport handling and session management.
*
* <p>Based on the {@link TransportHandler} SPI. {@link TransportHandler}s may additionally
* implement the {@link SockJsSessionFactory} and {@link HandshakeHandler} interfaces.
*
* <p>See the {@link AbstractSockJsService} base class for important details on request mapping.
*
* @author Rossen Stoyanchev
* @author Juergen Hoeller
* @since 4.0
*/
public class TransportHandlingSockJsService extends AbstractSockJsService implements SockJsServiceConfig {
private static final boolean jackson2Present = ClassUtils.isPresent(
"com.fasterxml.jackson.databind.ObjectMapper", TransportHandlingSockJsService.class.getClassLoader());
private final Map<TransportType, TransportHandler> handlers = new HashMap<TransportType, TransportHandler>();
private SockJsMessageCodec messageCodec;
private final List<HandshakeInterceptor> interceptors = new ArrayList<HandshakeInterceptor>();
private final Map<String, SockJsSession> sessions = new ConcurrentHashMap<String, SockJsSession>();
private ScheduledFuture<?> sessionCleanupTask;
/**
* Create a TransportHandlingSockJsService with given {@link TransportHandler handler} types.
* @param scheduler a task scheduler for heart-beat messages and removing timed-out sessions;
* the provided TaskScheduler should be declared as a Spring bean to ensure it gets
* initialized at start-up and shuts down when the application stops
* @param handlers one or more {@link TransportHandler} implementations to use
*/
public TransportHandlingSockJsService(TaskScheduler scheduler, TransportHandler... handlers) {
this(scheduler, Arrays.asList(handlers));
}
/**
* Create a TransportHandlingSockJsService with given {@link TransportHandler handler} types.
* @param scheduler a task scheduler for heart-beat messages and removing timed-out sessions;
* the provided TaskScheduler should be declared as a Spring bean to ensure it gets
* initialized at start-up and shuts down when the application stops
* @param handlers one or more {@link TransportHandler} implementations to use
*/
public TransportHandlingSockJsService(TaskScheduler scheduler, Collection<TransportHandler> handlers) {
super(scheduler);
if (CollectionUtils.isEmpty(handlers)) {
logger.warn("No transport handlers specified for TransportHandlingSockJsService");
}
else {
for (TransportHandler handler : handlers) {
handler.initialize(this);
this.handlers.put(handler.getTransportType(), handler);
}
}
if (jackson2Present) {
this.messageCodec = new Jackson2SockJsMessageCodec();
}
}
/**
* Return the registered handlers per transport type.
*/
public Map<TransportType, TransportHandler> getTransportHandlers() {
return Collections.unmodifiableMap(this.handlers);
}
/**
* The codec to use for encoding and decoding SockJS messages.
*/
public void setMessageCodec(SockJsMessageCodec messageCodec) {
this.messageCodec = messageCodec;
}
public SockJsMessageCodec getMessageCodec() {
Assert.state(this.messageCodec != null, "A SockJsMessageCodec is required but not available: " +
"Add Jackson 2 to the classpath, or configure a custom SockJsMessageCodec.");
return this.messageCodec;
}
/**
* 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 Collections.unmodifiableList(this.interceptors);
}
@Override
protected void handleRawWebSocketRequest(ServerHttpRequest request, ServerHttpResponse response,
WebSocketHandler handler) throws IOException {
TransportHandler transportHandler = this.handlers.get(TransportType.WEBSOCKET);
if (!(transportHandler instanceof HandshakeHandler)) {
logger.error("No handler configured for raw WebSocket messages");
response.setStatusCode(HttpStatus.NOT_FOUND);
return;
}
HandshakeInterceptorChain chain = new HandshakeInterceptorChain(this.interceptors, handler);
HandshakeFailureException failure = null;
try {
Map<String, Object> attributes = new HashMap<String, Object>();
if (!chain.applyBeforeHandshake(request, response, attributes)) {
return;
}
((HandshakeHandler) transportHandler).doHandshake(request, response, handler, attributes);
chain.applyAfterHandshake(request, response, null);
}
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;
}
}
}
@Override
protected void handleTransportRequest(ServerHttpRequest request, ServerHttpResponse response,
WebSocketHandler handler, String sessionId, String transport) throws SockJsException {
TransportType transportType = TransportType.fromValue(transport);
if (transportType == null) {
logger.error("Unknown transport type for " + request.getURI());
response.setStatusCode(HttpStatus.NOT_FOUND);
return;
}
TransportHandler transportHandler = this.handlers.get(transportType);
if (transportHandler == null) {
logger.error("No TransportHandler for " + request.getURI());
response.setStatusCode(HttpStatus.NOT_FOUND);
return;
}
HttpMethod supportedMethod = transportType.getHttpMethod();
if (!supportedMethod.equals(request.getMethod())) {
if (HttpMethod.OPTIONS.equals(request.getMethod()) && transportType.supportsCors()) {
if (checkAndAddCorsHeaders(request, response, HttpMethod.OPTIONS, supportedMethod)) {
response.setStatusCode(HttpStatus.NO_CONTENT);
addCacheHeaders(response);
}
}
else if (transportType.supportsCors()) {
sendMethodNotAllowed(response, supportedMethod, HttpMethod.OPTIONS);
}
else {
sendMethodNotAllowed(response, supportedMethod);
}
return;
}
HandshakeInterceptorChain chain = new HandshakeInterceptorChain(this.interceptors, handler);
SockJsException failure = null;
try {
SockJsSession session = this.sessions.get(sessionId);
if (session == null) {
if (transportHandler instanceof SockJsSessionFactory) {
Map<String, Object> attributes = new HashMap<String, Object>();
if (!chain.applyBeforeHandshake(request, response, attributes)) {
return;
}
SockJsSessionFactory sessionFactory = (SockJsSessionFactory) transportHandler;
session = createSockJsSession(sessionId, sessionFactory, handler, attributes);
}
else {
response.setStatusCode(HttpStatus.NOT_FOUND);
if (logger.isDebugEnabled()) {
logger.debug("Session not found, sessionId=" + sessionId +
". The session may have been closed " +
"(e.g. missed heart-beat) while a message was coming in.");
}
return;
}
}
if (transportType.sendsNoCacheInstruction()) {
addNoCacheHeaders(response);
}
if (transportType.supportsCors()) {
if (!checkAndAddCorsHeaders(request, response)) {
return;
}
}
transportHandler.handleRequest(request, response, handler, session);
chain.applyAfterHandshake(request, response, null);
}
catch (SockJsException ex) {
failure = ex;
}
catch (Throwable ex) {
failure = new SockJsException("Uncaught failure for request " + request.getURI(), sessionId, ex);
}
finally {
if (failure != null) {
chain.applyAfterHandshake(request, response, failure);
throw failure;
}
}
}
@Override
protected boolean validateRequest(String serverId, String sessionId, String transport) {
if (!getAllowedOrigins().contains("*") && !TransportType.fromValue(transport).supportsOrigin()) {
logger.error("Origin check has been enabled, but this transport does not support it");
return false;
}
return super.validateRequest(serverId, sessionId, transport);
}
private SockJsSession createSockJsSession(String sessionId, SockJsSessionFactory sessionFactory,
WebSocketHandler handler, Map<String, Object> attributes) {
SockJsSession session = this.sessions.get(sessionId);
if (session != null) {
return session;
}
if (this.sessionCleanupTask == null) {
scheduleSessionTask();
}
session = sessionFactory.createSession(sessionId, handler, attributes);
this.sessions.put(sessionId, session);
return session;
}
private void scheduleSessionTask() {
synchronized (this.sessions) {
if (this.sessionCleanupTask != null) {
return;
}
final List<String> removedSessionIds = new ArrayList<String>();
this.sessionCleanupTask = getTaskScheduler().scheduleAtFixedRate(new Runnable() {
@Override
public void run() {
for (SockJsSession session : sessions.values()) {
try {
if (session.getTimeSinceLastActive() > getDisconnectDelay()) {
sessions.remove(session.getId());
session.close();
}
}
catch (Throwable ex) {
// Could be part of normal workflow (e.g. browser tab closed)
logger.debug("Failed to close " + session, ex);
}
}
if (logger.isDebugEnabled() && !removedSessionIds.isEmpty()) {
logger.debug("Closed " + removedSessionIds.size() + " sessions " + removedSessionIds);
removedSessionIds.clear();
}
}
}, getDisconnectDelay());
}
}
}