matterbridge/vendor/github.com/Rhymen/go-whatsapp/message.go
2020-10-11 23:07:00 +02:00

891 lines
23 KiB
Go

package whatsapp
import (
"encoding/hex"
"encoding/json"
"fmt"
"io"
"math/rand"
"strconv"
"strings"
"time"
"github.com/Rhymen/go-whatsapp/binary"
"github.com/Rhymen/go-whatsapp/binary/proto"
)
type MediaType string
const (
MediaImage MediaType = "WhatsApp Image Keys"
MediaVideo MediaType = "WhatsApp Video Keys"
MediaAudio MediaType = "WhatsApp Audio Keys"
MediaDocument MediaType = "WhatsApp Document Keys"
)
func (wac *Conn) Send(msg interface{}) (string, error) {
var msgProto *proto.WebMessageInfo
switch m := msg.(type) {
case *proto.WebMessageInfo:
msgProto = m
case TextMessage:
msgProto = getTextProto(m)
case ImageMessage:
var err error
m.url, m.mediaKey, m.fileEncSha256, m.fileSha256, m.fileLength, err = wac.Upload(m.Content, MediaImage)
if err != nil {
return "ERROR", fmt.Errorf("image upload failed: %v", err)
}
msgProto = getImageProto(m)
case VideoMessage:
var err error
m.url, m.mediaKey, m.fileEncSha256, m.fileSha256, m.fileLength, err = wac.Upload(m.Content, MediaVideo)
if err != nil {
return "ERROR", fmt.Errorf("video upload failed: %v", err)
}
msgProto = getVideoProto(m)
case DocumentMessage:
var err error
m.url, m.mediaKey, m.fileEncSha256, m.fileSha256, m.fileLength, err = wac.Upload(m.Content, MediaDocument)
if err != nil {
return "ERROR", fmt.Errorf("document upload failed: %v", err)
}
msgProto = getDocumentProto(m)
case AudioMessage:
var err error
m.url, m.mediaKey, m.fileEncSha256, m.fileSha256, m.fileLength, err = wac.Upload(m.Content, MediaAudio)
if err != nil {
return "ERROR", fmt.Errorf("audio upload failed: %v", err)
}
msgProto = getAudioProto(m)
case LocationMessage:
msgProto = GetLocationProto(m)
case LiveLocationMessage:
msgProto = GetLiveLocationProto(m)
case ContactMessage:
msgProto = getContactMessageProto(m)
default:
return "ERROR", fmt.Errorf("cannot match type %T, use message types declared in the package", msg)
}
ch, err := wac.sendProto(msgProto)
if err != nil {
return "ERROR", fmt.Errorf("could not send proto: %v", err)
}
select {
case response := <-ch:
var resp map[string]interface{}
if err = json.Unmarshal([]byte(response), &resp); err != nil {
return "ERROR", fmt.Errorf("error decoding sending response: %v\n", err)
}
if int(resp["status"].(float64)) != 200 {
return "ERROR", fmt.Errorf("message sending responded with %v", resp["status"])
}
if int(resp["status"].(float64)) == 200 {
return getMessageInfo(msgProto).Id, nil
}
case <-time.After(wac.msgTimeout):
return "ERROR", fmt.Errorf("sending message timed out")
}
return "ERROR", nil
}
func (wac *Conn) sendProto(p *proto.WebMessageInfo) (<-chan string, error) {
n := binary.Node{
Description: "action",
Attributes: map[string]string{
"type": "relay",
"epoch": strconv.Itoa(wac.msgCount),
},
Content: []interface{}{p},
}
return wac.writeBinary(n, message, ignore, p.Key.GetId())
}
// RevokeMessage revokes a message (marks as "message removed") for everyone
func (wac *Conn) RevokeMessage(remotejid, msgid string, fromme bool) (revokeid string, err error) {
// create a revocation ID (required)
rawrevocationID := make([]byte, 10)
rand.Read(rawrevocationID)
revocationID := strings.ToUpper(hex.EncodeToString(rawrevocationID))
//
ts := uint64(time.Now().Unix())
status := proto.WebMessageInfo_PENDING
mtype := proto.ProtocolMessage_REVOKE
revoker := &proto.WebMessageInfo{
Key: &proto.MessageKey{
FromMe: &fromme,
Id: &revocationID,
RemoteJid: &remotejid,
},
MessageTimestamp: &ts,
Message: &proto.Message{
ProtocolMessage: &proto.ProtocolMessage{
Type: &mtype,
Key: &proto.MessageKey{
FromMe: &fromme,
Id: &msgid,
RemoteJid: &remotejid,
},
},
},
Status: &status,
}
if _, err := wac.Send(revoker); err != nil {
return revocationID, err
}
return revocationID, nil
}
// DeleteMessage deletes a single message for the user (removes the msgbox). To
// delete the message for everyone, use RevokeMessage
func (wac *Conn) DeleteMessage(remotejid, msgid string, fromMe bool) error {
ch, err := wac.deleteChatProto(remotejid, msgid, fromMe)
if err != nil {
return fmt.Errorf("could not send proto: %v", err)
}
select {
case response := <-ch:
var resp map[string]interface{}
if err = json.Unmarshal([]byte(response), &resp); err != nil {
return fmt.Errorf("error decoding deletion response: %v", err)
}
if int(resp["status"].(float64)) != 200 {
return fmt.Errorf("message deletion responded with %v", resp["status"])
}
if int(resp["status"].(float64)) == 200 {
return nil
}
case <-time.After(wac.msgTimeout):
return fmt.Errorf("deleting message timed out")
}
return nil
}
func (wac *Conn) deleteChatProto(remotejid, msgid string, fromMe bool) (<-chan string, error) {
tag := fmt.Sprintf("%s.--%d", wac.timeTag, wac.msgCount)
owner := "true"
if !fromMe {
owner = "false"
}
n := binary.Node{
Description: "action",
Attributes: map[string]string{
"epoch": strconv.Itoa(wac.msgCount),
"type": "set",
},
Content: []interface{}{
binary.Node{
Description: "chat",
Attributes: map[string]string{
"type": "clear",
"jid": remotejid,
"media": "true",
},
Content: []binary.Node{
{
Description: "item",
Attributes: map[string]string{
"owner": owner,
"index": msgid,
},
},
},
},
},
}
return wac.writeBinary(n, chat, expires|skipOffline, tag)
}
func init() {
rand.Seed(time.Now().UTC().UnixNano())
}
/*
MessageInfo contains general message information. It is part of every of every message type.
*/
type MessageInfo struct {
Id string
RemoteJid string
SenderJid string
FromMe bool
Timestamp uint64
PushName string
Status MessageStatus
Source *proto.WebMessageInfo
}
type MessageStatus int
const (
Error MessageStatus = 0
Pending = 1
ServerAck = 2
DeliveryAck = 3
Read = 4
Played = 5
)
func getMessageInfo(msg *proto.WebMessageInfo) MessageInfo {
return MessageInfo{
Id: msg.GetKey().GetId(),
RemoteJid: msg.GetKey().GetRemoteJid(),
SenderJid: msg.GetKey().GetParticipant(),
FromMe: msg.GetKey().GetFromMe(),
Timestamp: msg.GetMessageTimestamp(),
Status: MessageStatus(msg.GetStatus()),
PushName: msg.GetPushName(),
Source: msg,
}
}
func getInfoProto(info *MessageInfo) *proto.WebMessageInfo {
if info.Id == "" || len(info.Id) < 2 {
b := make([]byte, 10)
rand.Read(b)
info.Id = strings.ToUpper(hex.EncodeToString(b))
}
if info.Timestamp == 0 {
info.Timestamp = uint64(time.Now().Unix())
}
info.FromMe = true
status := proto.WebMessageInfo_WEB_MESSAGE_INFO_STATUS(info.Status)
return &proto.WebMessageInfo{
Key: &proto.MessageKey{
FromMe: &info.FromMe,
RemoteJid: &info.RemoteJid,
Id: &info.Id,
},
MessageTimestamp: &info.Timestamp,
Status: &status,
}
}
/*
ContextInfo represents contextinfo of every message
*/
type ContextInfo struct {
QuotedMessageID string //StanzaId
QuotedMessage *proto.Message
Participant string
IsForwarded bool
}
func getMessageContext(msg *proto.ContextInfo) ContextInfo {
return ContextInfo{
QuotedMessageID: msg.GetStanzaId(), //StanzaId
QuotedMessage: msg.GetQuotedMessage(),
Participant: msg.GetParticipant(),
IsForwarded: msg.GetIsForwarded(),
}
}
func getContextInfoProto(context *ContextInfo) *proto.ContextInfo {
if len(context.QuotedMessageID) > 0 {
contextInfo := &proto.ContextInfo{
StanzaId: &context.QuotedMessageID,
}
if &context.QuotedMessage != nil {
contextInfo.QuotedMessage = context.QuotedMessage
contextInfo.Participant = &context.Participant
}
return contextInfo
}
return nil
}
/*
TextMessage represents a text message.
*/
type TextMessage struct {
Info MessageInfo
Text string
ContextInfo ContextInfo
}
func getTextMessage(msg *proto.WebMessageInfo) TextMessage {
text := TextMessage{Info: getMessageInfo(msg)}
if m := msg.GetMessage().GetExtendedTextMessage(); m != nil {
text.Text = m.GetText()
text.ContextInfo = getMessageContext(m.GetContextInfo())
} else {
text.Text = msg.GetMessage().GetConversation()
}
return text
}
func getTextProto(msg TextMessage) *proto.WebMessageInfo {
p := getInfoProto(&msg.Info)
contextInfo := getContextInfoProto(&msg.ContextInfo)
if contextInfo == nil {
p.Message = &proto.Message{
Conversation: &msg.Text,
}
} else {
p.Message = &proto.Message{
ExtendedTextMessage: &proto.ExtendedTextMessage{
Text: &msg.Text,
ContextInfo: contextInfo,
},
}
}
return p
}
/*
ImageMessage represents a image message. Unexported fields are needed for media up/downloading and media validation.
Provide a io.Reader as Content for message sending.
*/
type ImageMessage struct {
Info MessageInfo
Caption string
Thumbnail []byte
Type string
Content io.Reader
url string
mediaKey []byte
fileEncSha256 []byte
fileSha256 []byte
fileLength uint64
ContextInfo ContextInfo
}
func getImageMessage(msg *proto.WebMessageInfo) ImageMessage {
image := msg.GetMessage().GetImageMessage()
imageMessage := ImageMessage{
Info: getMessageInfo(msg),
Caption: image.GetCaption(),
Thumbnail: image.GetJpegThumbnail(),
url: image.GetUrl(),
mediaKey: image.GetMediaKey(),
Type: image.GetMimetype(),
fileEncSha256: image.GetFileEncSha256(),
fileSha256: image.GetFileSha256(),
fileLength: image.GetFileLength(),
ContextInfo: getMessageContext(image.GetContextInfo()),
}
return imageMessage
}
func getImageProto(msg ImageMessage) *proto.WebMessageInfo {
p := getInfoProto(&msg.Info)
contextInfo := getContextInfoProto(&msg.ContextInfo)
p.Message = &proto.Message{
ImageMessage: &proto.ImageMessage{
Caption: &msg.Caption,
JpegThumbnail: msg.Thumbnail,
Url: &msg.url,
MediaKey: msg.mediaKey,
Mimetype: &msg.Type,
FileEncSha256: msg.fileEncSha256,
FileSha256: msg.fileSha256,
FileLength: &msg.fileLength,
ContextInfo: contextInfo,
},
}
return p
}
/*
Download is the function to retrieve media data. The media gets downloaded, validated and returned.
*/
func (m *ImageMessage) Download() ([]byte, error) {
return Download(m.url, m.mediaKey, MediaImage, int(m.fileLength))
}
/*
VideoMessage represents a video message. Unexported fields are needed for media up/downloading and media validation.
Provide a io.Reader as Content for message sending.
*/
type VideoMessage struct {
Info MessageInfo
Caption string
Thumbnail []byte
Length uint32
Type string
Content io.Reader
GifPlayback bool
url string
mediaKey []byte
fileEncSha256 []byte
fileSha256 []byte
fileLength uint64
ContextInfo ContextInfo
}
func getVideoMessage(msg *proto.WebMessageInfo) VideoMessage {
vid := msg.GetMessage().GetVideoMessage()
videoMessage := VideoMessage{
Info: getMessageInfo(msg),
Caption: vid.GetCaption(),
Thumbnail: vid.GetJpegThumbnail(),
GifPlayback: vid.GetGifPlayback(),
url: vid.GetUrl(),
mediaKey: vid.GetMediaKey(),
Length: vid.GetSeconds(),
Type: vid.GetMimetype(),
fileEncSha256: vid.GetFileEncSha256(),
fileSha256: vid.GetFileSha256(),
fileLength: vid.GetFileLength(),
ContextInfo: getMessageContext(vid.GetContextInfo()),
}
return videoMessage
}
func getVideoProto(msg VideoMessage) *proto.WebMessageInfo {
p := getInfoProto(&msg.Info)
contextInfo := getContextInfoProto(&msg.ContextInfo)
p.Message = &proto.Message{
VideoMessage: &proto.VideoMessage{
Caption: &msg.Caption,
JpegThumbnail: msg.Thumbnail,
Url: &msg.url,
GifPlayback: &msg.GifPlayback,
MediaKey: msg.mediaKey,
Seconds: &msg.Length,
FileEncSha256: msg.fileEncSha256,
FileSha256: msg.fileSha256,
FileLength: &msg.fileLength,
Mimetype: &msg.Type,
ContextInfo: contextInfo,
},
}
return p
}
/*
Download is the function to retrieve media data. The media gets downloaded, validated and returned.
*/
func (m *VideoMessage) Download() ([]byte, error) {
return Download(m.url, m.mediaKey, MediaVideo, int(m.fileLength))
}
/*
AudioMessage represents a audio message. Unexported fields are needed for media up/downloading and media validation.
Provide a io.Reader as Content for message sending.
*/
type AudioMessage struct {
Info MessageInfo
Length uint32
Type string
Content io.Reader
Ptt bool
url string
mediaKey []byte
fileEncSha256 []byte
fileSha256 []byte
fileLength uint64
ContextInfo ContextInfo
}
func getAudioMessage(msg *proto.WebMessageInfo) AudioMessage {
aud := msg.GetMessage().GetAudioMessage()
audioMessage := AudioMessage{
Info: getMessageInfo(msg),
url: aud.GetUrl(),
mediaKey: aud.GetMediaKey(),
Length: aud.GetSeconds(),
Type: aud.GetMimetype(),
fileEncSha256: aud.GetFileEncSha256(),
fileSha256: aud.GetFileSha256(),
fileLength: aud.GetFileLength(),
ContextInfo: getMessageContext(aud.GetContextInfo()),
}
return audioMessage
}
func getAudioProto(msg AudioMessage) *proto.WebMessageInfo {
p := getInfoProto(&msg.Info)
contextInfo := getContextInfoProto(&msg.ContextInfo)
p.Message = &proto.Message{
AudioMessage: &proto.AudioMessage{
Url: &msg.url,
MediaKey: msg.mediaKey,
Seconds: &msg.Length,
FileEncSha256: msg.fileEncSha256,
FileSha256: msg.fileSha256,
FileLength: &msg.fileLength,
Mimetype: &msg.Type,
ContextInfo: contextInfo,
Ptt: &msg.Ptt,
},
}
return p
}
/*
Download is the function to retrieve media data. The media gets downloaded, validated and returned.
*/
func (m *AudioMessage) Download() ([]byte, error) {
return Download(m.url, m.mediaKey, MediaAudio, int(m.fileLength))
}
/*
DocumentMessage represents a document message. Unexported fields are needed for media up/downloading and media
validation. Provide a io.Reader as Content for message sending.
*/
type DocumentMessage struct {
Info MessageInfo
Title string
PageCount uint32
Type string
FileName string
Thumbnail []byte
Content io.Reader
url string
mediaKey []byte
fileEncSha256 []byte
fileSha256 []byte
fileLength uint64
ContextInfo ContextInfo
}
func getDocumentMessage(msg *proto.WebMessageInfo) DocumentMessage {
doc := msg.GetMessage().GetDocumentMessage()
documentMessage := DocumentMessage{
Info: getMessageInfo(msg),
Title: doc.GetTitle(),
PageCount: doc.GetPageCount(),
Type: doc.GetMimetype(),
FileName: doc.GetFileName(),
Thumbnail: doc.GetJpegThumbnail(),
url: doc.GetUrl(),
mediaKey: doc.GetMediaKey(),
fileEncSha256: doc.GetFileEncSha256(),
fileSha256: doc.GetFileSha256(),
fileLength: doc.GetFileLength(),
ContextInfo: getMessageContext(doc.GetContextInfo()),
}
return documentMessage
}
func getDocumentProto(msg DocumentMessage) *proto.WebMessageInfo {
p := getInfoProto(&msg.Info)
contextInfo := getContextInfoProto(&msg.ContextInfo)
p.Message = &proto.Message{
DocumentMessage: &proto.DocumentMessage{
JpegThumbnail: msg.Thumbnail,
Url: &msg.url,
MediaKey: msg.mediaKey,
FileEncSha256: msg.fileEncSha256,
FileSha256: msg.fileSha256,
FileLength: &msg.fileLength,
PageCount: &msg.PageCount,
Title: &msg.Title,
Mimetype: &msg.Type,
ContextInfo: contextInfo,
},
}
return p
}
/*
Download is the function to retrieve media data. The media gets downloaded, validated and returned.
*/
func (m *DocumentMessage) Download() ([]byte, error) {
return Download(m.url, m.mediaKey, MediaDocument, int(m.fileLength))
}
/*
LocationMessage represents a location message
*/
type LocationMessage struct {
Info MessageInfo
DegreesLatitude float64
DegreesLongitude float64
Name string
Address string
Url string
JpegThumbnail []byte
ContextInfo ContextInfo
}
func GetLocationMessage(msg *proto.WebMessageInfo) LocationMessage {
loc := msg.GetMessage().GetLocationMessage()
locationMessage := LocationMessage{
Info: getMessageInfo(msg),
DegreesLatitude: loc.GetDegreesLatitude(),
DegreesLongitude: loc.GetDegreesLongitude(),
Name: loc.GetName(),
Address: loc.GetAddress(),
Url: loc.GetUrl(),
JpegThumbnail: loc.GetJpegThumbnail(),
ContextInfo: getMessageContext(loc.GetContextInfo()),
}
return locationMessage
}
func GetLocationProto(msg LocationMessage) *proto.WebMessageInfo {
p := getInfoProto(&msg.Info)
contextInfo := getContextInfoProto(&msg.ContextInfo)
p.Message = &proto.Message{
LocationMessage: &proto.LocationMessage{
DegreesLatitude: &msg.DegreesLatitude,
DegreesLongitude: &msg.DegreesLongitude,
Name: &msg.Name,
Address: &msg.Address,
Url: &msg.Url,
JpegThumbnail: msg.JpegThumbnail,
ContextInfo: contextInfo,
},
}
return p
}
/*
LiveLocationMessage represents a live location message
*/
type LiveLocationMessage struct {
Info MessageInfo
DegreesLatitude float64
DegreesLongitude float64
AccuracyInMeters uint32
SpeedInMps float32
DegreesClockwiseFromMagneticNorth uint32
Caption string
SequenceNumber int64
JpegThumbnail []byte
ContextInfo ContextInfo
}
func GetLiveLocationMessage(msg *proto.WebMessageInfo) LiveLocationMessage {
loc := msg.GetMessage().GetLiveLocationMessage()
liveLocationMessage := LiveLocationMessage{
Info: getMessageInfo(msg),
DegreesLatitude: loc.GetDegreesLatitude(),
DegreesLongitude: loc.GetDegreesLongitude(),
AccuracyInMeters: loc.GetAccuracyInMeters(),
SpeedInMps: loc.GetSpeedInMps(),
DegreesClockwiseFromMagneticNorth: loc.GetDegreesClockwiseFromMagneticNorth(),
Caption: loc.GetCaption(),
SequenceNumber: loc.GetSequenceNumber(),
JpegThumbnail: loc.GetJpegThumbnail(),
ContextInfo: getMessageContext(loc.GetContextInfo()),
}
return liveLocationMessage
}
func GetLiveLocationProto(msg LiveLocationMessage) *proto.WebMessageInfo {
p := getInfoProto(&msg.Info)
contextInfo := getContextInfoProto(&msg.ContextInfo)
p.Message = &proto.Message{
LiveLocationMessage: &proto.LiveLocationMessage{
DegreesLatitude: &msg.DegreesLatitude,
DegreesLongitude: &msg.DegreesLongitude,
AccuracyInMeters: &msg.AccuracyInMeters,
SpeedInMps: &msg.SpeedInMps,
DegreesClockwiseFromMagneticNorth: &msg.DegreesClockwiseFromMagneticNorth,
Caption: &msg.Caption,
SequenceNumber: &msg.SequenceNumber,
JpegThumbnail: msg.JpegThumbnail,
ContextInfo: contextInfo,
},
}
return p
}
/*
StickerMessage represents a sticker message.
*/
type StickerMessage struct {
Info MessageInfo
Type string
Content io.Reader
url string
mediaKey []byte
fileEncSha256 []byte
fileSha256 []byte
fileLength uint64
ContextInfo ContextInfo
}
func getStickerMessage(msg *proto.WebMessageInfo) StickerMessage {
sticker := msg.GetMessage().GetStickerMessage()
stickerMessage := StickerMessage{
Info: getMessageInfo(msg),
url: sticker.GetUrl(),
mediaKey: sticker.GetMediaKey(),
Type: sticker.GetMimetype(),
fileEncSha256: sticker.GetFileEncSha256(),
fileSha256: sticker.GetFileSha256(),
fileLength: sticker.GetFileLength(),
ContextInfo: getMessageContext(sticker.GetContextInfo()),
}
return stickerMessage
}
/*
Download is the function to retrieve Sticker media data. The media gets downloaded, validated and returned.
*/
func (m *StickerMessage) Download() ([]byte, error) {
return Download(m.url, m.mediaKey, MediaImage, int(m.fileLength))
}
/*
ContactMessage represents a contact message.
*/
type ContactMessage struct {
Info MessageInfo
DisplayName string
Vcard string
ContextInfo ContextInfo
}
func getContactMessage(msg *proto.WebMessageInfo) ContactMessage {
contact := msg.GetMessage().GetContactMessage()
contactMessage := ContactMessage{
Info: getMessageInfo(msg),
DisplayName: contact.GetDisplayName(),
Vcard: contact.GetVcard(),
ContextInfo: getMessageContext(contact.GetContextInfo()),
}
return contactMessage
}
func getContactMessageProto(msg ContactMessage) *proto.WebMessageInfo {
p := getInfoProto(&msg.Info)
contextInfo := getContextInfoProto(&msg.ContextInfo)
p.Message = &proto.Message{
ContactMessage: &proto.ContactMessage{
DisplayName: &msg.DisplayName,
Vcard: &msg.Vcard,
ContextInfo: contextInfo,
},
}
return p
}
func ParseProtoMessage(msg *proto.WebMessageInfo) interface{} {
switch {
case msg.GetMessage().GetAudioMessage() != nil:
return getAudioMessage(msg)
case msg.GetMessage().GetImageMessage() != nil:
return getImageMessage(msg)
case msg.GetMessage().GetVideoMessage() != nil:
return getVideoMessage(msg)
case msg.GetMessage().GetDocumentMessage() != nil:
return getDocumentMessage(msg)
case msg.GetMessage().GetConversation() != "":
return getTextMessage(msg)
case msg.GetMessage().GetExtendedTextMessage() != nil:
return getTextMessage(msg)
case msg.GetMessage().GetLocationMessage() != nil:
return GetLocationMessage(msg)
case msg.GetMessage().GetLiveLocationMessage() != nil:
return GetLiveLocationMessage(msg)
case msg.GetMessage().GetStickerMessage() != nil:
return getStickerMessage(msg)
case msg.GetMessage().GetContactMessage() != nil:
return getContactMessage(msg)
default:
//cannot match message
}
return nil
}
/*
BatteryMessage represents a battery level and charging state.
*/
type BatteryMessage struct {
Plugged bool
Powersave bool
Percentage int
}
func getBatteryMessage(msg map[string]string) BatteryMessage {
plugged, _ := strconv.ParseBool(msg["live"])
powersave, _ := strconv.ParseBool(msg["powersave"])
percentage, _ := strconv.Atoi(msg["value"])
batteryMessage := BatteryMessage{
Plugged: plugged,
Powersave: powersave,
Percentage: percentage,
}
return batteryMessage
}
func getNewContact(msg map[string]string) Contact {
contact := Contact{
Jid: msg["jid"],
Notify: msg["notify"],
}
return contact
}
func ParseNodeMessage(msg binary.Node) interface{} {
switch msg.Description {
case "battery":
return getBatteryMessage(msg.Attributes)
case "user":
return getNewContact(msg.Attributes)
default:
//cannot match message
}
return nil
}