callprocessing.java

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/* ====================================================================
 * The Apache Software License, Version 1.1
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 * Copyright (c) 2000 The Apache Software Foundation.  All rights
 * reserved.
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 * modification, are permitted provided that the following conditions
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 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
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 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
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 *    distribution.
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 * 3. The end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
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 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
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 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
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 *
 * Portions of this software are based upon public domain software
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package net.java.mais.sip;

import gov.nist.javax.sip.header.CSeq;
import gov.nist.javax.sip.header.Via;

import java.text.ParseException;
import java.util.ArrayList;

import javax.sip.ClientTransaction;
import javax.sip.Dialog;
import javax.sip.InvalidArgumentException;
import javax.sip.ServerTransaction;
import javax.sip.SipException;
import javax.sip.Transaction;
import javax.sip.TransactionUnavailableException;
import javax.sip.address.Address;
import javax.sip.address.SipURI;
import javax.sip.address.URI;
import javax.sip.header.CSeqHeader;
import javax.sip.header.CallIdHeader;
import javax.sip.header.ContactHeader;
import javax.sip.header.ContentLengthHeader;
import javax.sip.header.ContentTypeHeader;
import javax.sip.header.FromHeader;
import javax.sip.header.MaxForwardsHeader;
import javax.sip.header.ToHeader;
import javax.sip.message.Request;
import javax.sip.message.Response;

import net.java.mais.common.PropertiesDepot;
import net.java.mais.common.Utils;
import net.java.mais.sip.security.SipSecurityException;

/**
 * <p>Title: SIP COMMUNICATOR-1.1</p>
 * <p>Description: JAIN-SIP-1.1 Audio/Video Phone Application</p>
 * <p>Copyright: Copyright (c) 2003</p>
 * <p>Company: Organisation: LSIIT Laboratory (http://lsiit.u-strasbg.fr)<p>
 * </p>Network Research Team (http://www-r2.u-strasbg.fr))<p>
 * </p>Louis Pasteur University - Strasbourg - France</p>
 * @author Emil Ivov
 * @version 1.1
 */

public class CallProcessing
{
    protected SipManager sipManCallback = null;
    protected CallDispatcher callDispatcher = new CallDispatcher();
    public static boolean isBusy = false;
    
    CallProcessing()
    {
    }

    CallProcessing(SipManager sipManCallback)
    {
        this.sipManCallback = sipManCallback;
    }

    void setSipManagerCallBack(SipManager sipManCallback)
    {
        this.sipManCallback = sipManCallback;
    }

//============================= Remotely Initiated Processing ===================================
    //----------------------------- Responses
    void processTrying(ClientTransaction clientTransaction, Response response)
    {
        try {

            //find the call
            Call call = callDispatcher.findCall(clientTransaction.
                                                getDialog());
            if (call == null) {
                sipManCallback.fireUnknownMessageReceived(response);
                return;
            }
            //change status
            if (!call.getState().equals(Call.MOVING_LOCALLY))
                call.setState(Call.DIALING);
        }
        finally {
            
        }
    }

    void processRinging(ClientTransaction clientTransaction, Response response)
    {
        try
        {
            //find the call
            Call call = callDispatcher.findCall(clientTransaction.
                                                getDialog());
            call.setRemoteSdpDescription(new String(response.getRawContent()));
            if (call == null) {
                //?maybe we should just ignore it?
                sipManCallback.fireUnknownMessageReceived(response);
                return;
            }
            //change status
            call.setState(Call.RINGING);
        }
        finally
        {
            
        }
    }

    void processRingingBack(ClientTransaction clientTransaction, Response response)
    {
        try
        {
            //find the call
            Call call = callDispatcher.findCall(clientTransaction.
                                                getDialog());
            call.setRemoteSdpDescription(new String(response.getRawContent()));
            if (call == null) {
                //?maybe we should just ignore it?
                sipManCallback.fireUnknownMessageReceived(response);
                return;
            }
            //change status
            call.setState(Call.RINGING);
        }
        finally
        {
            
        }
    }    
    
    /**
     * According to the RFC  a
     * UAC canceling a request cannot rely on receiving a 487 (Request
     * Terminated) response for the original request, as an RFC 2543-
     * compliant UAS will not generate such a response. So we are closing the
     * call when sending the cancel request and here we don't do anything.
     * @param clientTransaction
     * @param response
     */
    void processRequestTerminated(ClientTransaction clientTransaction,
                                  Response response)
    {
        try
        {
           //add any additional code here
        }
        finally
        {
            
        }
    }

    void processByeOK(ClientTransaction clientTransaction, Response response)
    {
        try {
            

            //add any additional code here
        }
        finally {
            
        }
    }

    void processCancelOK(ClientTransaction clientTransaction, Response response)
    {
        try
        {
            

            //add any additional code here
        }
        finally
        {
            
        }
    }

    void processInviteOK(ClientTransaction clientTransaction, Response ok)
    {
        try
        {            
            //find the call
            Call call = callDispatcher.findCall(clientTransaction.
                                                getDialog());
            if (call == null) {
                sipManCallback.fireUnknownMessageReceived(ok);
                return;
            }
            //Send ACK
            try {
                //Need to use dialog generated ACKs so that the remote UA core
                //sees them - Fixed by M.Ranganathan
                Request ack = (Request) clientTransaction.getDialog().
                    createRequest(Request.ACK);
                clientTransaction.getDialog().sendAck(ack);
            }
            catch (SipException ex) {
                
                call.setState(Call.DISCONNECTED);
                sipManCallback.fireCommunicationsError(
                    new CommunicationsException(
                    "Failed to acknowledge call!"
                    , ex)
                    );
                return;
            }
            // !!! set sdp content before setting call state as that is where
            //listeners get alerted and they need the sdp
            call.setRemoteSdpDescription(new String(ok.getRawContent()));
            //change status
            if (!call.getState().equals(Call.CONNECTED)) {
                call.setState(Call.CONNECTED);
            }
        }
        finally
        {
            
        }

    }

    void processBusyHere(ClientTransaction clientTransaction, Response busyHere)
    {
        try
        {            
            //find the call
            Call call = callDispatcher.findCall(clientTransaction.
                                                getDialog());
            if (call == null) {
                sipManCallback.fireUnknownMessageReceived(busyHere);
                return;
            }
            //change status
            call.setState(Call.BUSY);
            //it is the stack that should be sending the ACK so don't do it here
        }
        finally
        {
            
        }
    }

    void processCallError(ClientTransaction clientTransaction, Response notAcceptable)
    {
        try
        {
            
            //find the call
            Call call = callDispatcher.findCall(clientTransaction.
                                                getDialog());
            if (call == null) {
                sipManCallback.fireUnknownMessageReceived(notAcceptable);
                return;
            }
            //change status
            call.setState(Call.FAILED);
                sipManCallback.fireCommunicationsError(
                            new CommunicationsException(
                            "Remote party returned error response: " + notAcceptable.getStatusCode()
                            +" - " + notAcceptable.getReasonPhrase()
                        )
                    );
                return;

            //it is the stack that should be sending the ACK so don't do it here

        }
        finally
        {
            
        }


    }


    /**
     * Attempts to re-ogenerate the corresponding request with the proper
     * credentials and terminates the call if it fails.
     *
     * @param clientTransaction the corresponding transaction
     * @param response the challenge
     */
    void processAuthenticationChallenge(ClientTransaction clientTransaction,
                                        Response response)
    {
        try {
            Request challengedRequest = clientTransaction.getRequest();
            
            ClientTransaction retryTran = sipManCallback.sipSecurityManager.
                    handleChallenge(response, clientTransaction);
            //There is a new dialog that will be started with this request. Get
            //that dialog and record it into the Call objet for later use (by
            //Bye-s for example).

            Call call = callDispatcher.findCall(clientTransaction.getDialog());
            call.setDialog(retryTran.getDialog());
            call.setInitialRequest(retryTran.getRequest());
            System.out.println(retryTran.getRequest());
            retryTran.sendRequest();
        }
        catch (SipSecurityException exc) {
            callDispatcher.findCall(clientTransaction.getDialog()).
                setState(Call.FAILED);
            sipManCallback.fireCommunicationsError(
               new CommunicationsException("Authorization failed!", exc));
        }
        catch (Exception exc) {
            callDispatcher.findCall(clientTransaction.getDialog()).
                setState(Call.FAILED);
            sipManCallback.fireCommunicationsError(
                new CommunicationsException("Failed to resend a request "
                                            + "after a security challenge!",
                                            exc)
                );
        }
        finally {