DistributableClick2CallSipServlet.java

/*
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */
package org.mobicents.servlet.sip.example;

import java.io.IOException;

import javax.annotation.Resource;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.sip.Address;
import javax.servlet.sip.SipErrorEvent;
import javax.servlet.sip.SipFactory;
import javax.servlet.sip.SipServlet;
import javax.servlet.sip.SipServletRequest;
import javax.servlet.sip.SipServletResponse;
import javax.servlet.sip.SipSession;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
 * This example shows a simple User agent that can any accept call and reply to BYE or initiate BYE 
 * depending on the sender.
 * 
 * @author vralev
 *
 */
public class DistributableClick2CallSipServlet 
		extends SipServlet {
	private static final long serialVersionUID = 1L;
	@Resource
	private SipFactory sipFactory;
	
	private static Log logger = LogFactory.getLog(DistributableClick2CallSipServlet.class);

	private static final String CONTACT_HEADER = "Contact";
	
	public DistributableClick2CallSipServlet() {
	}

	@Override
	public void init(ServletConfig servletConfig) throws ServletException {
		super.init(servletConfig);
	}

	/**
	 * {@inheritDoc}
	 */
	@Override
	protected void doInvite(SipServletRequest req) throws ServletException,
			IOException {
		logger.info("Click2Dial don't handle INVITE. Here's the one we got :  " + req.toString());
		
	}
	
	@Override
	protected void doOptions(SipServletRequest req) throws ServletException,
			IOException {
		logger.info("Got :  " + req.toString());
		req.createResponse(SipServletResponse.SC_OK).send();
	}
	
	@Override
    protected void doSuccessResponse(SipServletResponse resp)
			throws ServletException, IOException {
		logger.info("Got OK");
		SipSession session = resp.getSession();

		if ("INVITE".equals(resp.getMethod()) && resp.getStatus() == SipServletResponse.SC_OK) {

			Boolean inviteSent = (Boolean) session.getAttribute("InviteSent");
			if (inviteSent != null && inviteSent.booleanValue()) {
				return;
			}
			Address secondPartyAddress = (Address) resp.getSession()
					.getAttribute("SecondPartyAddress");
			if (secondPartyAddress != null) {
				resp.getApplicationSession().setAttribute("setFromSipServletUA1", resp.getApplicationSession().getId());

				SipServletRequest invite = sipFactory.createRequest(resp
						.getApplicationSession(), "INVITE", session
						.getRemoteParty(), secondPartyAddress);

				logger.info("Found second party -- sending INVITE to "
						+ secondPartyAddress);

				String contentType = resp.getContentType();
				if (contentType != null && contentType.trim().equals("application/sdp")) {
					invite.setContent(resp.getContent(), "application/sdp");
				}

				session.setAttribute("LinkedSession", invite.getSession());
				invite.getSession().setAttribute("LinkedSession", session);

				SipServletRequest ack = resp.createAck();
				invite.getSession().setAttribute("FirstPartyAck", ack);
				invite.getSession().setAttribute("FirstPartyContent", resp.getContent());
				
				invite.send();

				session.setAttribute("InviteSent", Boolean.TRUE);
			} else {
				resp.getApplicationSession().setAttribute("setFromSipServletUA2", resp.getApplicationSession().getId());
				String cSeqValue = resp.getHeader("CSeq");
				if(cSeqValue.indexOf("INVITE") != -1) {				
					logger.info("Got OK from second party -- sending ACK");
	
					SipServletRequest secondPartyAck = resp.createAck();
					SipServletRequest firstPartyAck = (SipServletRequest) resp
							.getSession().getAttribute("FirstPartyAck");
	
					if (resp.getContentType() != null && resp.getContentType().equals("application/sdp")) {
						firstPartyAck.setContent(resp.getContent(),
								"application/sdp");
						secondPartyAck.setContent(resp.getSession().getAttribute("FirstPartyContent"),
								"application/sdp");
					}
	
					session.setAttribute("LinkedSession", firstPartyAck.getSession());
					firstPartyAck.getSession().setAttribute("LinkedSession", session);
					
					firstPartyAck.send();
					secondPartyAck.send();
				}
			}
		}
	}
	
	@Override
	protected void doErrorResponse(SipServletResponse resp) throws ServletException,
			IOException {
		// If someone rejects it remove the call from the table

	}

	@Override
	protected void doBye(SipServletRequest request) throws ServletException,
			IOException {
		logger.info("Got bye");
		SipSession session = request.getSession();
		SipSession linkedSession = (SipSession) session
				.getAttribute("LinkedSession");
		if (linkedSession != null) {
			SipServletRequest bye = linkedSession.createRequest("BYE");
			logger.info("Sending bye to " + linkedSession.getRemoteParty());
			bye.send();
		} else {
			throw new RuntimeException("linkedSession is not replicated correctly");
		}
		SipServletResponse ok = request
				.createResponse(SipServletResponse.SC_OK);
		ok.send();
	}
    
	/**
	 * {@inheritDoc}
	 */
	@Override
	protected void doResponse(SipServletResponse response)
			throws ServletException, IOException {

		logger.info("Got response:\n" + response);
		super.doResponse(response);
	}


	/**
	 * {@inheritDoc}
	 */
	public void noAckReceived(SipErrorEvent ee) {
		logger.info("Error: noAckReceived.");
	}
	
	/**
	 * {@inheritDoc}
	 */
	public void noPrackReceived(SipErrorEvent ee) {
		logger.info("Error: noPrackReceived.");
	}
}