// messageAddAVPsWithPath will dynamically add AVPs into the message
// append: append to the message, on false overwrite if AVP is single or add to group if AVP is Grouped
func messageSetAVPsWithPath(m *diam.Message, path []interface{}, avpValStr string, appnd bool, timezone string) error {
if len(path) == 0 {
return errors.New("Empty path as AVP filter")
}
dictAVPs := make([]*dict.AVP, len(path)) // for each subpath, one dictionary AVP
for i, subpath := range path {
if dictAVP, err := m.Dictionary().FindAVP(m.Header.ApplicationID, subpath); err != nil {
return err
} else if dictAVP == nil {
return fmt.Errorf("Cannot find AVP with id: %s", path[len(path)-1])
} else {
dictAVPs[i] = dictAVP
}
}
if dictAVPs[len(path)-1].Data.Type == diam.GroupedAVPType {
return errors.New("Last AVP in path needs not to be GroupedAVP")
}
var msgAVP *diam.AVP // Keep a reference here towards last AVP
lastAVPIdx := len(path) - 1
for i := lastAVPIdx; i >= 0; i-- {
var typeVal datatype.Type
if i == lastAVPIdx {
avpValByte, err := serializeAVPValueFromString(dictAVPs[i], avpValStr, timezone)
if err != nil {
return err
}
typeVal, err = datatype.Decode(dictAVPs[i].Data.Type, avpValByte)
if err != nil {
return err
}
} else {
typeVal = &diam.GroupedAVP{
AVP: []*diam.AVP{msgAVP}}
}
newMsgAVP := diam.NewAVP(dictAVPs[i].Code, avp.Mbit, dictAVPs[i].VendorID, typeVal) // FixMe: maybe Mbit with dictionary one
if i == lastAVPIdx-1 && !appnd { // last AVP needs to be appended in group
avps, _ := m.FindAVPsWithPath(path[:lastAVPIdx], dict.UndefinedVendorID)
if len(avps) != 0 { // Group AVP already in the message
prevGrpData := avps[0].Data.(*diam.GroupedAVP)
prevGrpData.AVP = append(prevGrpData.AVP, msgAVP)
m.Header.MessageLength += uint32(msgAVP.Len())
return nil
}
}
msgAVP = newMsgAVP
}
if !appnd { // Not group AVP, replace the previous set one with this one
avps, _ := m.FindAVPsWithPath(path, dict.UndefinedVendorID)
if len(avps) != 0 { // Group AVP already in the message
m.Header.MessageLength -= uint32(avps[0].Len()) // decrease message length since we overwrite
*avps[0] = *msgAVP
m.Header.MessageLength += uint32(msgAVP.Len())
return nil
}
}
m.AVP = append(m.AVP, msgAVP)
m.Header.MessageLength += uint32(msgAVP.Len())
return nil
}
// DecodeFromBytes decodes the bytes of a Diameter AVP.
// It uses the given application id and dictionary for decoding the bytes.
func (a *AVP) DecodeFromBytes(data []byte, application uint32, dictionary *dict.Parser) error {
dl := len(data)
if dl < 8 {
return fmt.Errorf("Not enough data to decode AVP header: %d bytes", dl)
}
a.Code = binary.BigEndian.Uint32(data[0:4])
a.Flags = data[4]
a.Length = int(uint24to32(data[5:8]))
if dl < int(a.Length) {
return fmt.Errorf("Not enough data to decode AVP: %d != %d",
dl, a.Length)
}
data = data[:a.Length] // this cuts padded bytes off
var hdrLength int
var payload []byte
// Read VendorId when required.
if a.Flags&avp.Vbit == avp.Vbit {
a.VendorID = binary.BigEndian.Uint32(data[8:12])
payload = data[12:]
hdrLength = 12
} else {
payload = data[8:]
hdrLength = 8
}
// Find this code in the dictionary.
dictAVP, err := dictionary.FindAVPWithVendor(application, a.Code, a.VendorID)
if err != nil {
return err
}
bodyLen := a.Length - hdrLength
if n := len(payload); n < bodyLen {
return fmt.Errorf(
"Not enough data to decode AVP: %d != %d",
hdrLength, n,
)
}
a.Data, err = datatype.Decode(dictAVP.Data.Type, payload)
if err != nil {
return err
}
// Handle grouped AVPs.
if a.Data.Type() == datatype.GroupedType {
a.Data, err = DecodeGrouped(
a.Data.(datatype.Grouped),
application, dictionary,
)
if err != nil {
return err
}
}
return nil
}
