/*
* 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.config.annotation;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import org.springframework.scheduling.TaskScheduler;
import org.springframework.util.Assert;
import org.springframework.util.LinkedMultiValueMap;
import org.springframework.util.MultiValueMap;
import org.springframework.util.ObjectUtils;
import org.springframework.web.socket.WebSocketHandler;
import org.springframework.web.socket.server.HandshakeHandler;
import org.springframework.web.socket.server.HandshakeInterceptor;
import org.springframework.web.socket.server.support.OriginHandshakeInterceptor;
import org.springframework.web.socket.server.support.DefaultHandshakeHandler;
import org.springframework.web.socket.sockjs.SockJsService;
import org.springframework.web.socket.sockjs.transport.handler.WebSocketTransportHandler;
/**
* Base class for {@link WebSocketHandlerRegistration}s that gathers all the configuration
* options but allows sub-classes to put together the actual HTTP request mappings.
*
* @author Rossen Stoyanchev
* @author Sebastien Deleuze
* @since 4.0
*/
public abstract class AbstractWebSocketHandlerRegistration<M> implements WebSocketHandlerRegistration {
private final TaskScheduler sockJsTaskScheduler;
private MultiValueMap<WebSocketHandler, String> handlerMap = new LinkedMultiValueMap<WebSocketHandler, String>();
private HandshakeHandler handshakeHandler;
private final List<HandshakeInterceptor> interceptors = new ArrayList<HandshakeInterceptor>();
private final List<String> allowedOrigins = new ArrayList<String>();
private SockJsServiceRegistration sockJsServiceRegistration;
public AbstractWebSocketHandlerRegistration(TaskScheduler defaultTaskScheduler) {
this.sockJsTaskScheduler = defaultTaskScheduler;
}
@Override
public WebSocketHandlerRegistration addHandler(WebSocketHandler handler, String... paths) {
Assert.notNull(handler);
Assert.notEmpty(paths);
this.handlerMap.put(handler, Arrays.asList(paths));
return this;
}
@Override
public WebSocketHandlerRegistration setHandshakeHandler(HandshakeHandler handshakeHandler) {
this.handshakeHandler = handshakeHandler;
return this;
}
protected HandshakeHandler getHandshakeHandler() {
return this.handshakeHandler;
}
@Override
public WebSocketHandlerRegistration addInterceptors(HandshakeInterceptor... interceptors) {
if (!ObjectUtils.isEmpty(interceptors)) {
this.interceptors.addAll(Arrays.asList(interceptors));
}
return this;
}
@Override
public WebSocketHandlerRegistration setAllowedOrigins(String... origins) {
this.allowedOrigins.clear();
if (!ObjectUtils.isEmpty(origins)) {
this.allowedOrigins.addAll(Arrays.asList(origins));
}
return this;
}
@Override
public SockJsServiceRegistration withSockJS() {
this.sockJsServiceRegistration = new SockJsServiceRegistration(this.sockJsTaskScheduler);
HandshakeInterceptor[] interceptors = getInterceptors();
if (interceptors.length > 0) {
this.sockJsServiceRegistration.setInterceptors(interceptors);
}
if (this.handshakeHandler != null) {
WebSocketTransportHandler transportHandler = new WebSocketTransportHandler(this.handshakeHandler);
this.sockJsServiceRegistration.setTransportHandlerOverrides(transportHandler);
}
if (!this.allowedOrigins.isEmpty()) {
this.sockJsServiceRegistration.setAllowedOrigins(this.allowedOrigins.toArray(new String[this.allowedOrigins.size()]));
}
return this.sockJsServiceRegistration;
}
protected HandshakeInterceptor[] getInterceptors() {
List<HandshakeInterceptor> interceptors = new ArrayList<HandshakeInterceptor>();
interceptors.addAll(this.interceptors);
if (!this.allowedOrigins.isEmpty()) {
OriginHandshakeInterceptor interceptor = new OriginHandshakeInterceptor();
interceptor.setAllowedOrigins(this.allowedOrigins);
interceptors.add(interceptor);
}
return interceptors.toArray(new HandshakeInterceptor[interceptors.size()]);
}
protected final M getMappings() {
M mappings = createMappings();
if (this.sockJsServiceRegistration != null) {
SockJsService sockJsService = this.sockJsServiceRegistration.getSockJsService();
for (WebSocketHandler wsHandler : this.handlerMap.keySet()) {
for (String path : this.handlerMap.get(wsHandler)) {
String pathPattern = path.endsWith("/") ? path + "**" : path + "/**";
addSockJsServiceMapping(mappings, sockJsService, wsHandler, pathPattern);
}
}
}
else {
HandshakeHandler handshakeHandler = getOrCreateHandshakeHandler();
HandshakeInterceptor[] interceptors = getInterceptors();
for (WebSocketHandler wsHandler : this.handlerMap.keySet()) {
for (String path : this.handlerMap.get(wsHandler)) {
addWebSocketHandlerMapping(mappings, wsHandler, handshakeHandler, interceptors, path);
}
}
}
return mappings;
}
private HandshakeHandler getOrCreateHandshakeHandler() {
return (this.handshakeHandler != null) ? this.handshakeHandler : new DefaultHandshakeHandler();
}
protected abstract M createMappings();
protected abstract void addSockJsServiceMapping(M mappings, SockJsService sockJsService,
WebSocketHandler handler, String pathPattern);
protected abstract void addWebSocketHandlerMapping(M mappings, WebSocketHandler wsHandler,
HandshakeHandler handshakeHandler, HandshakeInterceptor[] interceptors, String path);
}