ch.rasc.wampspring.user.UserSessionWebSocketHandlerDecoratorFactory.java Source code

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Here is the source code for ch.rasc.wampspring.user.UserSessionWebSocketHandlerDecoratorFactory.java

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/*
 * Copyright 2015 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 ch.rasc.wampspring.user;

import java.security.Principal;

import org.springframework.messaging.simp.user.UserSessionRegistry;
import org.springframework.util.Assert;
import org.springframework.web.socket.CloseStatus;
import org.springframework.web.socket.WebSocketHandler;
import org.springframework.web.socket.WebSocketSession;
import org.springframework.web.socket.handler.WebSocketHandlerDecorator;
import org.springframework.web.socket.handler.WebSocketHandlerDecoratorFactory;

/**
 * WebSocket handler decorator that manages the relationship between a
 * {@link Principal#getName()} to a WebSocket session id. The mappings are stored in an
 * {@link org.springframework.messaging.simp.user.UserSessionRegistry} bean.
 *
 * The UserSessionRegistry handling is not enabled by default! See
 * {@link AbstractUserWampConfigurer} for configuration.
 */
public final class UserSessionWebSocketHandlerDecoratorFactory implements WebSocketHandlerDecoratorFactory {

    private final UserSessionRegistry userSessionRegistry;

    public UserSessionWebSocketHandlerDecoratorFactory(UserSessionRegistry userSessionRegistry) {
        Assert.notNull(userSessionRegistry, "'userSessionRegistry' is required ");
        this.userSessionRegistry = userSessionRegistry;
    }

    @Override
    public WebSocketHandler decorate(WebSocketHandler handler) {
        return new UserSessionWebSocketHandler(handler);
    }

    private final class UserSessionWebSocketHandler extends WebSocketHandlerDecorator {

        public UserSessionWebSocketHandler(WebSocketHandler delegate) {
            super(delegate);
        }

        @Override
        public void afterConnectionEstablished(WebSocketSession webSocketSession) throws Exception {
            super.afterConnectionEstablished(webSocketSession);

            Principal principal = webSocketSession.getPrincipal();
            if (principal != null) {
                UserSessionWebSocketHandlerDecoratorFactory.this.userSessionRegistry
                        .registerSessionId(principal.getName(), webSocketSession.getId());
            }
        }

        @Override
        public void afterConnectionClosed(WebSocketSession webSocketSession, CloseStatus closeStatus)
                throws Exception {

            Principal principal = webSocketSession.getPrincipal();
            if (principal != null) {
                String userName = principal.getName();
                UserSessionWebSocketHandlerDecoratorFactory.this.userSessionRegistry.unregisterSessionId(userName,
                        webSocketSession.getId());
            }

            super.afterConnectionClosed(webSocketSession, closeStatus);
        }

    }
}