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/*
* Conditions Of Use 
* 
* This software was developed by employees of the National Institute of
* Standards and Technology (NIST), and others. 
* This software is has been contributed to the public domain. 
* As a result, a formal license is not needed to use the software.
* 
* This software is provided "AS IS."  
* NIST MAKES NO WARRANTY OF ANY KIND, EXPRESS, IMPLIED
* OR STATUTORY, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTY OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, NON-INFRINGEMENT
* AND DATA ACCURACY.  NIST does not warrant or make any representations
* regarding the use of the software or the results thereof, including but
* not limited to the correctness, accuracy, reliability or usefulness of
* the software.
* 
* 
*/
package test.tck.msgflow.callflows.subsnotify;

import javax.sip.ClientTransaction;
import javax.sip.Dialog;
import javax.sip.DialogState;
import javax.sip.DialogTerminatedEvent;
import javax.sip.IOExceptionEvent;
import javax.sip.ListeningPoint;
import javax.sip.RequestEvent;
import javax.sip.ResponseEvent;
import javax.sip.ServerTransaction;
import javax.sip.SipListener;
import javax.sip.SipProvider;
import javax.sip.SipStack;
import javax.sip.Transaction;
import javax.sip.TransactionTerminatedEvent;
import javax.sip.address.Address;
import javax.sip.address.AddressFactory;
import javax.sip.address.SipURI;
import javax.sip.header.CSeqHeader;
import javax.sip.header.ContactHeader;
import javax.sip.header.EventHeader;
import javax.sip.header.ExpiresHeader;
import javax.sip.header.HeaderFactory;
import javax.sip.header.SubscriptionStateHeader;
import javax.sip.header.ToHeader;
import javax.sip.header.ViaHeader;
import javax.sip.message.MessageFactory;
import javax.sip.message.Request;
import javax.sip.message.Response;

import org.apache.log4j.FileAppender;
import org.apache.log4j.Level;
import org.apache.log4j.Logger;
import org.apache.log4j.SimpleLayout;

import test.tck.TestHarness;
import test.tck.msgflow.callflows.ProtocolObjects;

/**
 * This is the side that sends out the notify.
 * 
 * This code is released to  domain.
 * 
 * @author M. Ranganathan
 */

public class Notifier implements SipListener {

	private static AddressFactory addressFactory;

	private static MessageFactory messageFactory;

	private static HeaderFactory headerFactory;

	private static SipStack sipStack;

	
	private int port;

	protected SipProvider sipProvider;

	protected Dialog dialog;

	private String transport;

	private static Logger logger = Logger.getLogger(Notifier.class) ;
	
	private boolean gotSubscribeRequest;

	static {
		try {
			logger.setLevel(Level.INFO);
			logger.addAppender(new FileAppender(new SimpleLayout(),
					"logs/notifieroutputlog.txt"));
		} catch (Exception ex) {
			logger.info(ex.getMessage(), ex);
			TestHarness.fail("Failed to initialize Subscriber, because of " + ex.getMessage());
		}
	}

	class MyEventSource implements Runnable {
		private Notifier notifier;
		private EventHeader eventHeader;

		public MyEventSource(Notifier notifier, EventHeader eventHeader ) {
			this.notifier = notifier;
			this.eventHeader = eventHeader;
		}

		public void run() {
			try {
				for (int i = 0; i < 1; i++) {

					Thread.sleep(1000);
					Request request = this.notifier.dialog.createRequest(Request.NOTIFY);
					SubscriptionStateHeader subscriptionState = headerFactory
							.createSubscriptionStateHeader(SubscriptionStateHeader.ACTIVE);
					request.addHeader(subscriptionState);
					request.addHeader(eventHeader);
					
					// Lets mark our Contact
					((SipURI)dialog.getLocalParty().getURI()).setParameter("id","not2");
					
					ClientTransaction ct = sipProvider.getNewClientTransaction(request);
					logger.info("NOTIFY Branch ID " +
						((ViaHeader)request.getHeader(ViaHeader.NAME)).getParameter("branch"));
					this.notifier.dialog.sendRequest(ct);
					logger.info("Dialog " + dialog);
					logger.info("Dialog state after active NOTIFY: " + dialog.getState());
				}
				
				
			} catch (Throwable ex) {
				logger.info(ex.getMessage(), ex);
				TestHarness.fail("Failed MyEventSource.run(), because of " + ex.getMessage());
			}
		}
	}

	public void processRequest(RequestEvent requestEvent) {
		Request request = requestEvent.getRequest();
		ServerTransaction serverTransactionId = requestEvent
				.getServerTransaction();

		logger.info("\n\nRequest " + request.getMethod()
				+ " received at " + sipStack.getStackName()
				+ " with server transaction id " + serverTransactionId
				+ " and dialog id " + requestEvent.getDialog() );

		if (request.getMethod().equals(Request.SUBSCRIBE)) {
			processSubscribe(requestEvent, serverTransactionId);
		}

	}

	/**
	 * Process the invite request.
	 */
	public void processSubscribe(RequestEvent requestEvent,
			ServerTransaction serverTransaction) {
		SipProvider sipProvider = (SipProvider) requestEvent.getSource();
		Request request = requestEvent.getRequest();
		try {
			logger.info("notifier: got an Subscribe sending OK");
			logger.info("notifier:  " + request);
			logger.info("notifier : dialog = " + requestEvent.getDialog());
			EventHeader eventHeader = (EventHeader) request.getHeader(EventHeader.NAME);
			this.gotSubscribeRequest = true;
			
			AbstractSubsnotifyTestCase.assertTrue("Event header is null ", eventHeader != null);
						
			// Always create a ServerTransaction, best as early as possible in the code
			Response response = null;
			ServerTransaction st = requestEvent.getServerTransaction();			
			if (st == null) {
				st = sipProvider.getNewServerTransaction(request);
			}
			
			// Check if it is an initial SUBSCRIBE or a refresh / unsubscribe
			boolean isInitial = requestEvent.getDialog() == null;
			if ( isInitial ) {
				// JvB: need random tags to test forking
				String toTag = Integer.toHexString( (int) (Math.random() * Integer.MAX_VALUE) );
				response = messageFactory.createResponse(202, request);
				ToHeader toHeader = (ToHeader) response.getHeader(ToHeader.NAME);
				
				// Sanity check: to header should not ahve a tag. Else the dialog 
				// should have matched
				AbstractSubsnotifyTestCase.assertTrue("To tag should  be null ", toHeader.getTag() == null);				
				toHeader.setTag(toTag); // Application is supposed to set.
				
				this.dialog = st.getDialog();
				// subscribe dialogs do not terminate on bye.
				this.dialog.terminateOnBye(false);
				
				AbstractSubsnotifyTestCase.assertTrue("initial -- dialog assigned to the transaction not null " , dialog != null );
				AbstractSubsnotifyTestCase.assertTrue("Dialog state should be null ", dialog.getState() == null);
			
			} else {
				response = messageFactory.createResponse(200, request);
			}

			// Both 2xx response to SUBSCRIBE and NOTIFY need a Contact
			Address address = addressFactory.createAddress("Notifier ");
			((SipURI)address.getURI()).setPort( sipProvider.getListeningPoint(transport).getPort() );				
			ContactHeader contactHeader = headerFactory.createContactHeader(address);			
			response.addHeader(contactHeader);
			
			// Expires header is mandatory in 2xx responses to SUBSCRIBE
			ExpiresHeader expires = (ExpiresHeader) request.getHeader( ExpiresHeader.NAME );
			if (expires==null) {
				expires = headerFactory.createExpiresHeader(30);	// rather short
			}
			response.addHeader( expires );
			
			/*
			 * JvB: The SUBSCRIBE MUST be answered first. See RFC3265 3.1.6.2: 
			 * "[...] a NOTIFY message is always sent immediately after any 200-
			 * class response to a SUBSCRIBE request"
			 * 
			 *  Do this before creating the NOTIFY request below
			 */
			st.sendResponse(response);
			//Thread.sleep(1000); // Be kind to implementations
						
			/*
			 * NOTIFY requests MUST contain a "Subscription-State" header with a
			 * value of "active", "pending", or "terminated". The "active" value
			 * indicates that the subscription has been accepted and has been
			 * authorized (in most cases; see section 5.2.). The "pending" value
			 * indicates that the subscription has been received, but that
			 * policy information is insufficient to accept or deny the
			 * subscription at this time. The "terminated" value indicates that
			 * the subscription is not active.
			 */
		
			Request notifyRequest = dialog.createRequest( "NOTIFY" );
			
			
			// Mark the contact header, to check that the remote contact is updated
			((SipURI)contactHeader.getAddress().getURI()).setParameter("id","not");
			
			// Initial state is pending, second time we assume terminated (Expires==0)
			SubscriptionStateHeader sstate = headerFactory.createSubscriptionStateHeader(
					isInitial ? SubscriptionStateHeader.PENDING : SubscriptionStateHeader.TERMINATED );
			
			// Need a reason for terminated
			if ( sstate.getState().equalsIgnoreCase("terminated") ) {
				sstate.setReasonCode( "deactivated" );
			}
			
			notifyRequest.addHeader(sstate);
			notifyRequest.setHeader(eventHeader);
			notifyRequest.setHeader(contactHeader);
			// notifyRequest.setHeader(routeHeader);
			ClientTransaction ct = sipProvider.getNewClientTransaction(notifyRequest);

			// Let the other side know that the tx is pending acceptance
			//
			dialog.sendRequest(ct);
			logger.info("NOTIFY Branch ID " +
				((ViaHeader)request.getHeader(ViaHeader.NAME)).getParameter("branch"));
			logger.info("Dialog " + dialog);
			logger.info("Dialog state after pending NOTIFY: " + dialog.getState());
			AbstractSubsnotifyTestCase.assertTrue("Dialog state after pending NOTIFY ",
					dialog.getState() == DialogState.CONFIRMED);
			
			if (isInitial) {
				Thread myEventSource = new Thread(new MyEventSource(this,eventHeader));
				myEventSource.start();
			}
		} catch (Throwable ex) {
			logger.info(ex.getMessage(), ex);
			TestHarness.fail("Failed to processs Subscriber, because of " + ex.getMessage());
		}
	}

	public void processResponse(ResponseEvent responseReceivedEvent) {
		Response response = (Response) responseReceivedEvent.getResponse();
		Transaction tid = responseReceivedEvent.getClientTransaction();

		logger.info("Response received with client transaction id "
				+ tid + " CSeq = " +
				response.getHeader(CSeqHeader.NAME) 
				+ " status code = " + response.getStatusCode() );

	}

	public void processTimeout(javax.sip.TimeoutEvent timeoutEvent) {
		Transaction transaction;
		if (timeoutEvent.isServerTransaction()) {
			transaction = timeoutEvent.getServerTransaction();
		} else {
			transaction = timeoutEvent.getClientTransaction();
		}
		logger.info("state = " + transaction.getState());
		logger.info("dialog = " + transaction.getDialog());
		logger.info("dialogState = "
				+ transaction.getDialog().getState());
		logger.info("Transaction Time out");
		
		AbstractSubsnotifyTestCase.fail("Unexpected timeout event");
	}

	public SipProvider createProvider(int newPort) {
		
		try {
			
			port = newPort;
			
			ListeningPoint lp = sipStack.createListeningPoint("127.0.0.1",
					this.port, transport);
						
			this.sipProvider = sipStack.createSipProvider(lp);
			logger.info("udp provider " + sipProvider);
			
		} catch (Exception ex) {
			logger.info(ex.getMessage(), ex);
			sipProvider = null;
			TestHarness.fail("Failed to create SIP Provider on port " + newPort + ", because of " + ex.getMessage());
		}
		
		return sipProvider;
	}

	public Notifier(ProtocolObjects protObjects) {
		addressFactory = protObjects.addressFactory;
		messageFactory = protObjects.messageFactory;
		headerFactory = protObjects.headerFactory;
		sipStack = protObjects.sipStack;
		transport = protObjects.transport;
	}

	public void processIOException(IOExceptionEvent exceptionEvent) {
		// TODO Auto-generated method stub

	}

	public void processTransactionTerminated(
			TransactionTerminatedEvent transactionTerminatedEvent) {
		// TODO Auto-generated method stub

	}

	public void processDialogTerminated(
			DialogTerminatedEvent dialogTerminatedEvent) {
		// TODO Auto-generated method stub

	}
	
	public void checkState() {
		TestHarness.assertTrue("Did not see subscribe", this.gotSubscribeRequest);
	}

}




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