ReplacesReceiverSipServlet.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.testsuite;

import java.io.IOException;

import javax.annotation.Resource;
import javax.servlet.ServletException;
import javax.servlet.sip.SipApplicationSession;
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 javax.servlet.sip.SipSessionsUtil;
import javax.servlet.sip.SipURI;

import org.apache.log4j.Logger;


public class ReplacesReceiverSipServlet extends SipServlet {
	private static final long serialVersionUID = 1L;
	private static final String REPLACES = "Replaces";
	private static transient Logger logger = Logger.getLogger(ReplacesReceiverSipServlet.class);
	private static final String CONTENT_TYPE = "text/plain;charset=UTF-8";
	
	@Resource
	private SipFactory sipFactory;
	@Resource
	private SipSessionsUtil sipSessionsUtil;
	
	/** Creates a new instance of ReplacesSenderSipServlet */
	public ReplacesReceiverSipServlet() {
	}
	
	@Override
	protected void doInvite(SipServletRequest request) throws ServletException,
			IOException {
		logger.info("Got request:\n" + request.toString());		
		SipServletResponse sipServletResponse = 
			request.createResponse(SipServletResponse.SC_OK);		
		if("receiver".equalsIgnoreCase(((SipURI)request.getFrom().getURI()).getUser()) && request.getHeader(REPLACES) == null) {
			sipServletResponse = 
				request.createResponse(SipServletResponse.SC_DECLINE);
		} else if("receiver".equalsIgnoreCase(((SipURI)request.getFrom().getURI()).getUser()) && request.getHeader(REPLACES) != null) {
			SipSession sipSession = sipSessionsUtil.getCorrespondingSipSession(request.getSession(), REPLACES);
			if(sipSession == null) {
				sipServletResponse = 
					request.createResponse(SipServletResponse.SC_DECLINE);
			}
			request.getSession().setAttribute("ReplacesInviteReceived", Boolean.TRUE);
		}		
		sipServletResponse.send();
	}
	
	@Override
	protected void doAck(SipServletRequest request) throws ServletException,
			IOException {
		if(request.getSession().getAttribute("ReplacesInviteReceived") == null) {
			//building the Replaces content
			String callId = request.getHeader("Call-ID");
			String fromTag = request.getFrom().getParameter("tag");
			String toTag = request.getTo().getParameter("tag");			
			String messageContent = "Replaces : " + callId + "; from-tag=" + fromTag + "; to-tag=" + toTag;
			
			SipApplicationSession sipApplicationSession = sipFactory.createApplicationSession();
			SipURI fromURI = sipFactory.createSipURI("receiver", "sip-servlets.com");
			SipURI requestURI = sipFactory.createSipURI("receiver", "127.0.0.1:5090");
			SipServletRequest sipServletRequest = sipFactory.createRequest(sipApplicationSession, "MESSAGE", fromURI, request.getFrom().getURI());
			sipServletRequest.setContentLength(messageContent.length());
			sipServletRequest.setContent(messageContent, CONTENT_TYPE);
			sipServletRequest.setRequestURI(requestURI);		
			sipServletRequest.send();		
		} else {
			SipSession sipSession = request.getSession();
			sipSession.createRequest("BYE").send();
			SipSession replacedSession = sipSessionsUtil.getCorrespondingSipSession(sipSession, REPLACES);
			replacedSession.createRequest("BYE").send();
		}
	}
	
	@Override
	protected void doSuccessResponse(SipServletResponse resp)
			throws ServletException, IOException {
		logger.info("Got Success Response : " + resp);
		if(!"BYE".equalsIgnoreCase(resp.getMethod())) {
			resp.createAck().send();			
		}
	}

	/**
	 * {@inheritDoc}
	 */
	protected void doBye(SipServletRequest request) throws ServletException,
			IOException {

		if(request.getSession().getAttribute("replacesInvite") != null) {
			logger.info("Got BYE request: " + request);
			SipServletResponse sipServletResponse = request.createResponse(SipServletResponse.SC_OK);
			sipServletResponse.send();
		}
	}	
}