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Socket.IO server classes
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/**
 * The MIT License
 * Copyright (c) 2010 Tad Glines
 * 
 * Contributors: Tad Glines, Ovea.com, Mycila.com, Alexander Sova ([email protected])
 * 

 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 

 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
package com.codeminders.socketio.server.transport;

import com.codeminders.socketio.common.ConnectionState;
import com.codeminders.socketio.protocol.EngineIOProtocol;
import com.codeminders.socketio.server.*;

import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.ArrayList;
import java.util.logging.Level;
import java.util.logging.Logger;

public abstract class AbstractHttpTransport extends AbstractTransport
{
    private static final Logger LOGGER = Logger.getLogger(AbstractHttpTransport.class.getName());

    @Override
    public void handle(HttpServletRequest request,
                             HttpServletResponse response,
                             SocketIOManager socketIOManager)
            throws IOException
    {
        if (LOGGER.isLoggable(Level.FINE))
            LOGGER.fine("Handling " + request.getMethod() + " request by " + getClass().getName());

        TransportConnection connection = getConnection(request, socketIOManager);
        Session session = connection.getSession();

        if (session.getConnectionState() == ConnectionState.CONNECTING)
        {

            ArrayList upgrades = new ArrayList<>();
            if(socketIOManager.getTransportProvider().getTransport(TransportType.WEB_SOCKET) != null)
                upgrades.add("websocket");

            connection.send(EngineIOProtocol.createHandshakePacket(session.getSessionId(),
                    upgrades.toArray(new String[upgrades.size()]),
                    getConfig().getPingInterval(Config.DEFAULT_PING_INTERVAL),
                    getConfig().getTimeout(Config.DEFAULT_PING_TIMEOUT)));

            connection.handle(request, response); // called to send the handshake packet
            session.onConnect(connection);
        }
        else if (session.getConnectionState() == ConnectionState.CONNECTED)
        {
            connection.handle(request, response);
        }
        else
            response.sendError(HttpServletResponse.SC_GONE, "Socket.IO session is closed");
    }
}