/**
* Create a new default SIPRequest from the original request. Warning: the newly created
* SIPRequest, shares the headers of this request but we generate any new headers that we need to
* modify so the original request is umodified. However, if you modify the shared headers after
* this request is created, then the newly created request will also be modified. If you want to
* modify the original request without affecting the returned Request make sure you clone it
* before calling this method.
*
* <p>Only required headers are copied.
*
* <ul>
* <li>Contact headers are not included in the newly created request. Setting the appropriate
* sequence number is the responsibility of the caller.
* <li>RouteList is not copied for ACK and CANCEL
* <li>Note that we DO NOT copy the body of the argument into the returned header. We do not
* copy the content type header from the original request either. These have to be added
* seperately and the content length has to be correctly set if necessary the content length
* is set to 0 in the returned header.
* <li>Contact List is not copied from the original request.
* <li>RecordRoute List is not included from original request.
* <li>Via header is not included from the original request.
* </ul>
*
* @param requestLine is the new request line.
* @param switchHeaders is a boolean flag that causes to and from headers to switch (set this to
* true if you are the server of the transaction and are generating a BYE request). If the
* headers are switched, we generate new From and To headers otherwise we just use the
* incoming headers.
* @return a new Default SIP Request which has the requestLine specified.
*/
public SIPRequest createSIPRequest(RequestLine requestLine, boolean switchHeaders) {
SIPRequest newRequest = new SIPRequest();
newRequest.requestLine = requestLine;
Iterator headerIterator = this.getHeaders();
while (headerIterator.hasNext()) {
SIPHeader nextHeader = (SIPHeader) headerIterator.next();
// For BYE and cancel set the CSeq header to the
// appropriate method.
if (nextHeader instanceof CSeq) {
CSeq newCseq = (CSeq) nextHeader.clone();
nextHeader = newCseq;
try {
newCseq.setMethod(requestLine.getMethod());
} catch (ParseException e) {
}
} else if (nextHeader instanceof ViaList) {
Via via = (Via) (((ViaList) nextHeader).getFirst().clone());
via.removeParameter("branch");
nextHeader = via;
// Cancel and ACK preserve the branch ID.
} else if (nextHeader instanceof To) {
To to = (To) nextHeader;
if (switchHeaders) {
nextHeader = new From(to);
((From) nextHeader).removeTag();
} else {
nextHeader = (SIPHeader) to.clone();
((To) nextHeader).removeTag();
}
} else if (nextHeader instanceof From) {
From from = (From) nextHeader;
if (switchHeaders) {
nextHeader = new To(from);
((To) nextHeader).removeTag();
} else {
nextHeader = (SIPHeader) from.clone();
((From) nextHeader).removeTag();
}
} else if (nextHeader instanceof ContentLength) {
ContentLength cl = (ContentLength) nextHeader.clone();
try {
cl.setContentLength(0);
} catch (InvalidArgumentException e) {
}
nextHeader = cl;
} else if (!(nextHeader instanceof CallID) && !(nextHeader instanceof MaxForwards)) {
// Route is kept by dialog.
// RR is added by the caller.
// Contact is added by the Caller
// Any extension headers must be added
// by the caller.
continue;
}
try {
newRequest.attachHeader(nextHeader, false);
} catch (SIPDuplicateHeaderException e) {
e.printStackTrace();
}
}
if (MessageFactoryImpl.getDefaultUserAgentHeader() != null) {
newRequest.setHeader(MessageFactoryImpl.getDefaultUserAgentHeader());
}
return newRequest;
}
/**
* Creates a default ACK SIPRequest message for this original request. Note that the defaultACK
* SIPRequest does not include the content of the original SIPRequest. If responseToHeader is null
* then the toHeader of this request is used to construct the ACK. Note that tag fields are just
* copied from the original SIP Request. Added by Jeff Keyser.
*
* @param responseToHeader To header to use for this request.
* @return A SIPRequest with an ACK method.
*/
public SIPRequest createAckRequest(To responseToHeader) {
SIPRequest newRequest;
Iterator headerIterator;
SIPHeader nextHeader;
newRequest = new SIPRequest();
newRequest.setRequestLine((RequestLine) this.requestLine.clone());
newRequest.setMethod(Request.ACK);
headerIterator = getHeaders();
while (headerIterator.hasNext()) {
nextHeader = (SIPHeader) headerIterator.next();
if (nextHeader instanceof RouteList) {
// Ack and cancel do not get ROUTE headers.
// Route header for ACK is assigned by the
// Dialog if necessary.
continue;
} else if (nextHeader instanceof ProxyAuthorization) {
// Remove proxy auth header.
// Assigned by the Dialog if necessary.
continue;
} else if (nextHeader instanceof ContentLength) {
// Adding content is responsibility of user.
nextHeader = (SIPHeader) nextHeader.clone();
try {
((ContentLength) nextHeader).setContentLength(0);
} catch (InvalidArgumentException e) {
}
} else if (nextHeader instanceof ContentType) {
// Content type header is removed since
// content length is 0.
continue;
} else if (nextHeader instanceof CSeq) {
// The CSeq header field in the
// ACK MUST contain the same value for the
// sequence number as was present in the
// original request, but the method parameter
// MUST be equal to "ACK".
CSeq cseq = (CSeq) nextHeader.clone();
try {
cseq.setMethod(Request.ACK);
} catch (ParseException e) {
}
nextHeader = cseq;
} else if (nextHeader instanceof To) {
if (responseToHeader != null) {
nextHeader = responseToHeader;
} else {
nextHeader = (SIPHeader) nextHeader.clone();
}
} else if (nextHeader instanceof ContactList || nextHeader instanceof Expires) {
// CONTACT header does not apply for ACK requests.
continue;
} else if (nextHeader instanceof ViaList) {
// Bug reported by Gianluca Martinello
// The ACK MUST contain a single Via header field,
// and this MUST be equal to the top Via header
// field of the original
// request.
nextHeader = (SIPHeader) ((ViaList) nextHeader).getFirst().clone();
} else {
nextHeader = (SIPHeader) nextHeader.clone();
}
try {
newRequest.attachHeader(nextHeader, false);
} catch (SIPDuplicateHeaderException e) {
e.printStackTrace();
}
}
if (MessageFactoryImpl.getDefaultUserAgentHeader() != null) {
newRequest.setHeader(MessageFactoryImpl.getDefaultUserAgentHeader());
}
return newRequest;
}