* (non-Javadoc)
*
* @see javax.sip.ServerTransaction#sendResponse(javax.sip.message.Response)
*/
public void sendResponse(Response response) throws SipException {
SIPResponse sipResponse = (SIPResponse) response;
SIPDialog dialog = (SIPDialog) getDialog();
if (response == null)
throw new NullPointerException("null response");
try {
sipResponse.checkHeaders();
} catch (ParseException ex) {
throw new SipException(ex.getMessage());
}
// check for meaningful response.
final String responseMethod = sipResponse.getCSeq().getMethod();
if (!responseMethod.equals(this.getMethod())) {
throw new SipException(
"CSeq method does not match Request method of request that created the tx.");
}
/*
* 200-class responses to SUBSCRIBE requests also MUST contain an "Expires" header. The
* period of time in the response MAY be shorter but MUST NOT be longer than specified in
* the request.
*/
final int statusCode = response.getStatusCode();
if (this.getMethod().equals(Request.SUBSCRIBE) && statusCode / 100 == 2) {
if (response.getHeader(ExpiresHeader.NAME) == null) {
throw new SipException("Expires header is mandatory in 2xx response of SUBSCRIBE");
} else {
Expires requestExpires = (Expires) this.getOriginalRequest().getExpires();
Expires responseExpires = (Expires) response.getExpires();
/*
* If no "Expires" header is present in a SUBSCRIBE request, the implied default
* is defined by the event package being used.
*/
if (requestExpires != null
&& responseExpires.getExpires() > requestExpires.getExpires()) {
throw new SipException(
"Response Expires time exceeds request Expires time : See RFC 3265 3.1.1");
}
}
}
// Check for mandatory header.
if (statusCode == 200
&& responseMethod.equals(Request.INVITE)
&& sipResponse.getHeader(ContactHeader.NAME) == null)
throw new SipException("Contact Header is mandatory for the OK to the INVITE");
if (!this.isMessagePartOfTransaction((SIPMessage) response)) {
throw new SipException("Response does not belong to this transaction.");
}
// Fix up the response if the dialog has already been established.
try {
/*
* The UAS MAY send a final response to the initial request before
* having received PRACKs for all unacknowledged reliable provisional responses,
* unless the final response is 2xx and any of the unacknowledged reliable provisional
* responses contained a session description. In that case, it MUST NOT send a final
* response until those provisional responses are acknowledged.
*/
final ContentTypeHeader contentTypeHeader = ((SIPResponse)response).getContentTypeHeader();
if (this.pendingReliableResponseAsBytes != null
&& this.getDialog() != null
&& this.getInternalState() != TransactionState._TERMINATED
&& statusCode / 100 == 2
&& contentTypeHeader != null
&& contentTypeHeader.getContentType()
.equalsIgnoreCase(CONTENT_TYPE_APPLICATION)
&& contentTypeHeader.getContentSubType()
.equalsIgnoreCase(CONTENT_SUBTYPE_SDP)) {
if (!interlockProvisionalResponses ) {
throw new SipException("cannot send response -- unacked povisional");
} else {
try {
boolean acquired = this.provisionalResponseSem.tryAcquire(1,TimeUnit.SECONDS);
if (!acquired ) {
throw new SipException("cannot send response -- unacked povisional");
}
} catch (InterruptedException ex) {
sipStack.getStackLogger().logError ("Interrupted acuqiring PRACK sem");
throw new SipException("Cannot aquire PRACK sem");
}
}
} else {
// Sending the final response cancels the
// pending response task.
if (this.pendingReliableResponseAsBytes != null && sipResponse.isFinalResponse()) {
sipStack.getTimer().cancel(provisionalResponseTask);
this.provisionalResponseTask = null;
}
}
// Dialog checks. These make sure that the response
// being sent makes sense.
if (dialog != null) {
if (statusCode / 100 == 2
&& sipStack.isDialogCreated(responseMethod)) {
if (dialog.getLocalTag() == null && sipResponse.getToTag() == null) {
// Trying to send final response and user forgot to set
// to
// tag on the response -- be nice and assign the tag for
// the user.
sipResponse.getTo().setTag(Utils.getInstance().generateTag());
} else if (dialog.getLocalTag() != null && sipResponse.getToTag() == null) {
if ( sipStack.getStackLogger().isLoggingEnabled(LogWriter.TRACE_DEBUG)) {
sipStack.getStackLogger().logDebug("assigning toTag : serverTransaction = " + this + " dialog "
+ dialog + " tag = " + dialog.getLocalTag());
}
sipResponse.setToTag(dialog.getLocalTag());
} else if (dialog.getLocalTag() != null && sipResponse.getToTag() != null
&& !dialog.getLocalTag().equals(sipResponse.getToTag())) {
throw new SipException("Tag mismatch dialogTag is "
+ dialog.getLocalTag() + " responseTag is "
+ sipResponse.getToTag());
}
}
if (!sipResponse.getCallId().getCallId().equals(dialog.getCallId().getCallId())) {
throw new SipException("Dialog mismatch!");
}
}
// Backward compatibility slippery slope....
// Only set the from tag in the response when the
// incoming request has a from tag.
String fromTag = originalRequestFromTag;
if(getRequest() != null) {
fromTag = ((SIPRequest) this.getRequest()).getFromTag();
}
if (fromTag != null && sipResponse.getFromTag() != null
&& !sipResponse.getFromTag().equals(fromTag)) {
throw new SipException("From tag of request does not match response from tag");
} else if (fromTag != null) {
sipResponse.getFrom().setTag(fromTag);
} else {
if (sipStack.isLoggingEnabled(LogWriter.TRACE_DEBUG))
sipStack.getStackLogger().logDebug("WARNING -- Null From tag in request!!");
}