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//
//  ========================================================================
//  Copyright (c) 1995-2012 Mort Bay Consulting Pty. Ltd.
//  ------------------------------------------------------------------------
//  All rights reserved. This program and the accompanying materials
//  are made available under the terms of the Eclipse Public License v1.0
//  and Apache License v2.0 which accompanies this distribution.
//
//      The Eclipse Public License is available at
//      http://www.eclipse.org/legal/epl-v10.html
//
//      The Apache License v2.0 is available at
//      http://www.opensource.org/licenses/apache2.0.php
//
//  You may elect to redistribute this code under either of these licenses.
//  ========================================================================
//

package org.eclipse.jetty.websocket.server.handshake;

import java.io.IOException;

import javax.servlet.http.HttpServletResponse;

import org.eclipse.jetty.websocket.api.extensions.ExtensionConfig;
import org.eclipse.jetty.websocket.common.AcceptHash;
import org.eclipse.jetty.websocket.server.ServletWebSocketRequest;
import org.eclipse.jetty.websocket.server.ServletWebSocketResponse;
import org.eclipse.jetty.websocket.server.WebSocketHandshake;

/**
 * WebSocket Handshake for RFC 6455.
 */
public class HandshakeRFC6455 implements WebSocketHandshake
{
    /** RFC 6455 - Sec-WebSocket-Version */
    public static final int VERSION = 13;

    @Override
    public void doHandshakeResponse(ServletWebSocketRequest request, ServletWebSocketResponse response) throws IOException
    {
        String key = request.getHeader("Sec-WebSocket-Key");

        if (key == null)
        {
            throw new IllegalStateException("Missing request header 'Sec-WebSocket-Key'");
        }

        // build response
        response.setHeader("Upgrade","WebSocket");
        response.addHeader("Connection","Upgrade");
        response.addHeader("Sec-WebSocket-Accept",AcceptHash.hashKey(key));

        if (response.getAcceptedSubProtocol() != null)
        {
            response.addHeader("Sec-WebSocket-Protocol",response.getAcceptedSubProtocol());
        }

        if (request.getExtensions() != null)
        {
            response.setExtensions(request.getExtensions());
            for (ExtensionConfig ext : request.getExtensions())
            {
                response.addHeader("Sec-WebSocket-Extensions",ext.getParameterizedName());
            }
        }

        response.setStatus(HttpServletResponse.SC_SWITCHING_PROTOCOLS);
    }
}