func (this *SIPResponse) CreateRequest(requestURI address.SipURI, via *header.Via, cseq *header.CSeq) *SIPRequest {
newRequest := NewSIPRequest()
method := cseq.GetMethod()
newRequest.SetMethod(method)
newRequest.SetRequestURI(requestURI)
if (method == "ACK" || method == "CANCEL") && this.GetTopmostVia().GetBranch() != "" {
// Use the branch id from the OK.
//try {
via.SetBranch(this.GetTopmostVia().GetBranch())
//} catch (ParseException ex) {}
}
newRequest.SetHeader(via)
newRequest.SetHeader(cseq)
for headerIterator := this.getHeaders().Front(); headerIterator != nil; headerIterator = headerIterator.Next() {
nextHeader := headerIterator.Value.(header.Header)
// Some headers do not belong in a Request ....
if this.IsResponseHeader(nextHeader) {
continue
}
if _, ok := nextHeader.(*header.ViaList); ok {
continue
}
if _, ok := nextHeader.(*header.CSeq); ok {
continue
}
if _, ok := nextHeader.(*header.ContentType); ok {
continue
}
if _, ok := nextHeader.(*header.RecordRouteList); ok {
continue
}
// if _, ok:=nextHeader.(*header.To); ok{
// nextHeader = nextHeader.clone();
// }
// else if (nextHeader instanceof From)
// nextHeader = (SIPHeader)nextHeader.clone();
// try {
newRequest.AttachHeader2(nextHeader, false)
// } catch(SIPDuplicateHeaderException e){
// e.printStackTrace();
// }
}
return newRequest
}
/**
* Generate (compute) a transaction ID for this SIP message.
* @return A string containing the concatenation of various
* portions of the From,To,Via and RequestURI portions
* of this message as specified in RFC 2543:
* All responses to a request contain the same values in
* the Call-ID, CSeq, To, and From fields
* (with the possible addition of a tag in the To field
* (section 10.43)). This allows responses to be matched with requests.
* Incorporates a bug fix for a bug sent in by Gordon Ledgard of
* IPera for generating transactionIDs when no port is present in the
* via header.
* Incorporates a bug fix for a bug report sent in by Chris Mills
* of Nortel Networks (converts to lower case when returning the
* transaction identifier).
*
*@return a string that can be used as a transaction identifier
* for this message. This can be used for matching responses and
* requests (i.e. an outgoing request and its matching response have
* the same computed transaction identifier).
*/
func (this *SIPMessage) GetTransactionId() string {
var topVia *header.Via
if this.GetViaHeaders().Len() > 0 {
topVia = this.GetViaHeaders().Front().Value.(*header.Via)
}
// Have specified a branch Identifier so we can use it to identify
// the transaction. BranchId is not case sensitive.
// Branch Id prefix is not case sensitive.
if topVia != nil && topVia.GetBranch() != "" &&
strings.Contains(strings.ToUpper(topVia.GetBranch()),
strings.ToUpper(header.SIPConstants_BRANCH_MAGIC_COOKIE)) {
// Bis 09 compatible branch assignment algorithm.
// implies that the branch id can be used as a transaction
// identifier.
return strings.ToLower(topVia.GetBranch())
} else {
// Old style client so construct the transaction identifier
// from various fields of the request.
var retval bytes.Buffer
from := this.GetFrom().(*header.From)
to := this.GetTo().(*header.To)
hpFrom := from.GetUserAtHostPort()
retval.WriteString(hpFrom + ":")
if from.HasTag() {
retval.WriteString(from.GetTag() + ":")
}
hpTo := to.GetUserAtHostPort()
retval.WriteString(hpTo + ":")
cid := this.callIdHeader.GetCallId()
retval.WriteString(cid + ":")
retval.WriteRune(rune(this.cSeqHeader.GetSequenceNumber()))
retval.WriteString(":" + this.cSeqHeader.GetMethod())
if topVia != nil {
retval.WriteString(":" + topVia.GetSentBy().String())
if !topVia.GetSentBy().HasPort() {
retval.WriteString(":")
retval.WriteRune(5060)
}
}
hc := ToHexString([]byte(strings.ToLower(retval.String())))
if len(hc) < 32 {
return hc
} else {
return hc[len(hc)-32 : len(hc)]
}
}
// Convert to lower case -- bug fix as a result of a bug report
// from Chris Mills of Nortel Networks.
}
/** a parser for the essential part of the via header.
*/
func (this *ViaParser) ParseVia(v *header.Via) (ParseException error) {
lexer := this.GetLexer()
var protocolName, protocolVersion *core.Token
// The protocol
lexer.Match(TokenTypes_ID)
if protocolName = lexer.GetNextToken(); protocolName.GetTokenValue() != "SIP" {
return this.CreateParseException("Protcoal Not Supported error")
}
lexer.SPorHT()
// consume the "/"
lexer.Match('/')
lexer.SPorHT()
lexer.Match(TokenTypes_ID)
lexer.SPorHT()
if protocolVersion = lexer.GetNextToken(); protocolVersion.GetTokenValue() != "2.0" {
return this.CreateParseException("Version Not Supported error")
}
lexer.SPorHT()
// We consume the "/"
lexer.Match('/')
lexer.SPorHT()
lexer.Match(TokenTypes_ID)
lexer.SPorHT()
transport := lexer.GetNextToken()
lexer.SPorHT()
protocol := header.NewProtocol()
protocol.SetProtocolName(protocolName.GetTokenValue())
protocol.SetProtocolVersion(protocolVersion.GetTokenValue())
protocol.SetTransport(transport.GetTokenValue())
v.SetSentProtocol(protocol)
// sent-By
hnp := core.NewHostNameParserFromLexer(this.GetLexer())
var hostPort *core.HostPort
if hostPort, ParseException = hnp.GetHostPort(); ParseException != nil {
return ParseException
}
v.SetSentBy(hostPort)
// Ignore blanks
lexer.SPorHT()
var la byte
for la, _ = lexer.LookAheadK(0); la == ';'; la, _ = lexer.LookAheadK(0) {
lexer.Match(';')
lexer.SPorHT()
var nameValue *core.NameValue
if nameValue, ParseException = this.NameValue(); ParseException != nil {
return ParseException
}
name := nameValue.GetName()
nameValue.SetName(strings.ToLower(name))
v.SetParameterFromNameValue(nameValue)
lexer.SPorHT()
}
if la, _ = lexer.LookAheadK(0); la == '(' {
lexer.SelectLexer("charLexer")
lexer.ConsumeK(1)
var comment bytes.Buffer
for {
ch, _ := lexer.LookAheadK(0)
if ch == ')' {
lexer.ConsumeK(1)
break
} else if ch == '\\' {
// Escaped character
tok := lexer.GetNextToken()
comment.WriteString(tok.GetTokenValue())
lexer.ConsumeK(1)
tok = lexer.GetNextToken()
comment.WriteString(tok.GetTokenValue())
lexer.ConsumeK(1)
} else if ch == '\n' {
break
} else {
comment.WriteByte(ch)
lexer.ConsumeK(1)
}
}
v.SetComment(comment.String())
}
return nil
}