/**
 * Copyright 2007-2016, Kaazing Corporation. All rights reserved.
 *
 * 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.apache.mina.proxy;

import org.apache.mina.core.service.IoHandler;
import org.apache.mina.core.service.IoHandlerAdapter;
import org.apache.mina.core.session.IoSession;
import org.apache.mina.proxy.handlers.socks.SocksProxyRequest;
import org.apache.mina.proxy.session.ProxyIoSession;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * AbstractProxyIoHandler.java - {@link IoHandler} that intercepts events until handshake is complete.
 * 
 * @author <a href="http://mina.apache.org">Apache MINA Project</a>
 * @since MINA 2.0.0-M3
 */
public abstract class AbstractProxyIoHandler extends IoHandlerAdapter {
    private static final Logger logger = LoggerFactory
            .getLogger(AbstractProxyIoHandler.class);

    /**
     * Method called only when handshake has completed.
     * 
     * @param session the io session
     */
    public abstract void proxySessionOpened(IoSession session) throws Exception;

    /**
     * Hooked session opened event.
     * 
     * @param session the io session
     */
    @Override
    public final void sessionOpened(IoSession session) throws Exception {
        ProxyIoSession proxyIoSession = (ProxyIoSession) session
                .getAttribute(ProxyIoSession.PROXY_SESSION);

        if (proxyIoSession.getRequest() instanceof SocksProxyRequest
                || proxyIoSession.isAuthenticationFailed()
                || proxyIoSession.getHandler().isHandshakeComplete()) {
            proxySessionOpened(session);
        } else {
            logger.debug("Filtered session opened event !");
        }
    }
}