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/*
* ProtocolRouter.java February 2014
*
* Copyright (C) 2014, Niall Gallagher <niallg@users.sf.net>
*
* 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.simpleframework.http.socket.service;
import static org.simpleframework.http.Protocol.SEC_WEBSOCKET_PROTOCOL;
import static org.simpleframework.http.Protocol.SEC_WEBSOCKET_VERSION;
import static org.simpleframework.http.Protocol.UPGRADE;
import static org.simpleframework.http.Protocol.WEBSOCKET;
import java.io.IOException;
import java.util.List;
import java.util.Map;
import org.simpleframework.http.Request;
import org.simpleframework.http.Response;
/**
* The <code>ProtocolRouter</code> is used when there are multiple
* services that can be used. Each service is selected based on the
* protocol sent in the initiating request. If a match cannot be
* made based on the request then a default service us chosen.
*
* @author Niall Gallagher
*
* @see org.simpleframework.http.socket.service.RouterContainer
*/
public class ProtocolRouter implements Router {
/**
* This is the set of services that can be selected.
*/
private final Map<String, Service> registry;
/**
* This is the default service chosen if there is no match.
*/
private final Service primary;
/**
* Constructor for the <code>ProtocolRouter</code> object. This is
* used to create a router using a selection of services that can
* be selected using the <code>Sec-WebSocket-Protocol</code> header
* sent in the initiating request by the client.
*
* @param registry this is the registry of available services
* @param primary this is the default service to use
*/
public ProtocolRouter(Map<String, Service> registry, Service primary) throws IOException {
this.registry = registry;
this.primary = primary;
}
/**
* This is used to route an incoming request to a service if
* the request represents a WebSocket handshake as defined by
* RFC 6455. If the request is not a session initiating handshake
* then this will return a null value to allow it to be processed
* by some other part of the server.
*
* @param request this is the request to use for routing
* @param response this is the response to establish the session
*
* @return a service that can be used to process the session
*/
public Service route(Request request, Response response) {
String token = request.getValue(UPGRADE);
if(token != null) {
if(token.equalsIgnoreCase(WEBSOCKET)) {
List<String> protocols = request.getValues(SEC_WEBSOCKET_PROTOCOL);
String version = request.getValue(SEC_WEBSOCKET_VERSION);
if(version != null) {
response.setValue(SEC_WEBSOCKET_VERSION, version);
}
for(String protocol : protocols) {
Service service = registry.get(protocol);
if(service != null) {
response.setValue(SEC_WEBSOCKET_PROTOCOL, protocol);
return service;
}
}
return primary;
}
}
return null;
}
}
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