bridge/telegram/handlers.go
package btelegram
import (
"fmt"
"html"
"path/filepath"
"strconv"
"strings"
"unicode/utf16"
"github.com/42wim/matterbridge/bridge/config"
"github.com/42wim/matterbridge/bridge/helper"
"github.com/davecgh/go-spew/spew"
tgbotapi "github.com/matterbridge/telegram-bot-api/v6"
)
func (b *Btelegram) handleUpdate(rmsg *config.Message, message, posted, edited *tgbotapi.Message) *tgbotapi.Message {
// handle channels
if posted != nil {
if posted.Text == "/chatId" {
chatID := strconv.FormatInt(posted.Chat.ID, 10)
// Handle chat topics
if posted.IsTopicMessage {
chatID = chatID + "/" + strconv.Itoa(posted.MessageThreadID)
}
_, err := b.Send(config.Message{
Channel: chatID,
Text: fmt.Sprintf("ID of this chat: %s", chatID),
})
if err != nil {
b.Log.Warnf("Unable to send chatID to %s", chatID)
}
} else {
message = posted
rmsg.Text = message.Text
}
}
// edited channel message
if edited != nil && !b.GetBool("EditDisable") {
message = edited
rmsg.Text = rmsg.Text + message.Text + b.GetString("EditSuffix")
}
return message
}
// handleChannels checks if it's a channel message and if the message is a new or edited messages
func (b *Btelegram) handleChannels(rmsg *config.Message, message *tgbotapi.Message, update tgbotapi.Update) *tgbotapi.Message {
return b.handleUpdate(rmsg, message, update.ChannelPost, update.EditedChannelPost)
}
// handleGroups checks if it's a group message and if the message is a new or edited messages
func (b *Btelegram) handleGroups(rmsg *config.Message, message *tgbotapi.Message, update tgbotapi.Update) *tgbotapi.Message {
return b.handleUpdate(rmsg, message, update.Message, update.EditedMessage)
}
// handleForwarded handles forwarded messages
func (b *Btelegram) handleForwarded(rmsg *config.Message, message *tgbotapi.Message) {
if message.ForwardDate == 0 {
return
}
if message.ForwardFromChat != nil && message.ForwardFrom == nil {
rmsg.Text = "Forwarded from " + message.ForwardFromChat.Title + ": " + rmsg.Text
return
}
if message.ForwardFrom == nil {
rmsg.Text = "Forwarded from " + unknownUser + ": " + rmsg.Text
return
}
usernameForward := ""
if b.GetBool("UseFirstName") {
usernameForward = message.ForwardFrom.FirstName
}
if b.GetBool("UseFullName") {
usernameForward = message.ForwardFrom.FirstName + " " + message.ForwardFrom.LastName
}
if usernameForward == "" {
usernameForward = message.ForwardFrom.UserName
if usernameForward == "" {
usernameForward = message.ForwardFrom.FirstName
}
}
if usernameForward == "" {
usernameForward = unknownUser
}
rmsg.Text = "Forwarded from " + usernameForward + ": " + rmsg.Text
}
// handleQuoting handles quoting of previous messages
func (b *Btelegram) handleQuoting(rmsg *config.Message, message *tgbotapi.Message) {
// Used to check if the message was a reply to the root topic
if message.ReplyToMessage != nil && (!message.IsTopicMessage || message.ReplyToMessage.MessageID != message.MessageThreadID) { //nolint:nestif
usernameReply := ""
if message.ReplyToMessage.From != nil {
if b.GetBool("UseFirstName") {
usernameReply = message.ReplyToMessage.From.FirstName
}
if b.GetBool("UseFullName") {
usernameReply = message.ReplyToMessage.From.FirstName + " " + message.ReplyToMessage.From.LastName
}
if usernameReply == "" {
usernameReply = message.ReplyToMessage.From.UserName
if usernameReply == "" {
usernameReply = message.ReplyToMessage.From.FirstName
}
}
}
if usernameReply == "" {
usernameReply = unknownUser
}
if !b.GetBool("QuoteDisable") {
quote := message.ReplyToMessage.Text
if quote == "" {
quote = message.ReplyToMessage.Caption
}
rmsg.Text = b.handleQuote(rmsg.Text, usernameReply, quote)
}
}
}
// handleUsername handles the correct setting of the username
func (b *Btelegram) handleUsername(rmsg *config.Message, message *tgbotapi.Message) {
if message.From != nil {
rmsg.UserID = strconv.FormatInt(message.From.ID, 10)
if b.GetBool("UseFirstName") {
rmsg.Username = message.From.FirstName
}
if b.GetBool("UseFullName") {
if message.From.FirstName != "" && message.From.LastName != "" {
rmsg.Username = message.From.FirstName + " " + message.From.LastName
}
}
if rmsg.Username == "" {
rmsg.Username = message.From.UserName
if rmsg.Username == "" {
rmsg.Username = message.From.FirstName
}
}
// only download avatars if we have a place to upload them (configured mediaserver)
if b.General.MediaServerUpload != "" || (b.General.MediaServerDownload != "" && b.General.MediaDownloadPath != "") {
b.handleDownloadAvatar(message.From.ID, rmsg.Channel)
}
}
if message.SenderChat != nil { //nolint:nestif
rmsg.UserID = strconv.FormatInt(message.SenderChat.ID, 10)
if b.GetBool("UseFirstName") {
rmsg.Username = message.SenderChat.FirstName
}
if b.GetBool("UseFullName") {
if message.SenderChat.FirstName != "" && message.SenderChat.LastName != "" {
rmsg.Username = message.SenderChat.FirstName + " " + message.SenderChat.LastName
}
}
if rmsg.Username == "" || rmsg.Username == "Channel_Bot" {
rmsg.Username = message.SenderChat.UserName
if rmsg.Username == "" || rmsg.Username == "Channel_Bot" {
rmsg.Username = message.SenderChat.FirstName
}
}
// only download avatars if we have a place to upload them (configured mediaserver)
if b.General.MediaServerUpload != "" || (b.General.MediaServerDownload != "" && b.General.MediaDownloadPath != "") {
b.handleDownloadAvatar(message.SenderChat.ID, rmsg.Channel)
}
}
// Fallback on author signature (used in "channel" type of chat)
if rmsg.Username == "" && message.AuthorSignature != "" {
rmsg.Username = message.AuthorSignature
}
// if we really didn't find a username, set it to unknown
if rmsg.Username == "" {
rmsg.Username = unknownUser
}
}
func (b *Btelegram) handleRecv(updates <-chan tgbotapi.Update) {
for update := range updates {
b.Log.Debugf("== Receiving event: %#v", update.Message)
if update.Message == nil && update.ChannelPost == nil &&
update.EditedMessage == nil && update.EditedChannelPost == nil {
b.Log.Info("Received event without messages, skipping.")
continue
}
if b.GetInt("debuglevel") == 1 {
spew.Dump(update.Message)
}
b.handleGroupUpdate(update)
var message *tgbotapi.Message
rmsg := config.Message{Account: b.Account, Extra: make(map[string][]interface{})}
// handle channels
message = b.handleChannels(&rmsg, message, update)
// handle groups
message = b.handleGroups(&rmsg, message, update)
if message == nil {
b.Log.Error("message is nil, this shouldn't happen.")
continue
}
// set the ID's from the channel or group message
rmsg.ID = strconv.Itoa(message.MessageID)
rmsg.Channel = strconv.FormatInt(message.Chat.ID, 10)
if message.IsTopicMessage {
rmsg.Channel += "/" + strconv.Itoa(message.MessageThreadID)
}
// preserve threading from telegram reply
if message.ReplyToMessage != nil &&
// Used to check if the message was a reply to the root topic
(!message.IsTopicMessage || message.ReplyToMessage.MessageID != message.MessageThreadID) {
rmsg.ParentID = strconv.Itoa(message.ReplyToMessage.MessageID)
}
// handle entities (adding URLs)
b.handleEntities(&rmsg, message)
// handle username
b.handleUsername(&rmsg, message)
// handle any downloads
err := b.handleDownload(&rmsg, message)
if err != nil {
b.Log.Errorf("download failed: %s", err)
}
// handle forwarded messages
b.handleForwarded(&rmsg, message)
// quote the previous message
b.handleQuoting(&rmsg, message)
if rmsg.Text != "" || len(rmsg.Extra) > 0 {
// Comment the next line out due to avoid removing empty lines in Telegram
// rmsg.Text = helper.RemoveEmptyNewLines(rmsg.Text)
// channels don't have (always?) user information. see #410
if message.From != nil {
rmsg.Avatar = helper.GetAvatar(b.avatarMap, strconv.FormatInt(message.From.ID, 10), b.General)
}
b.Log.Debugf("<= Sending message from %s on %s to gateway", rmsg.Username, b.Account)
b.Log.Debugf("<= Message is %#v", rmsg)
b.Remote <- rmsg
}
}
}
func (b *Btelegram) handleGroupUpdate(update tgbotapi.Update) {
if msg := update.Message; msg != nil {
switch {
case msg.NewChatMembers != nil:
b.handleUserJoin(update)
case msg.LeftChatMember != nil:
b.handleUserLeave(update)
}
}
}
func (b *Btelegram) handleUserJoin(update tgbotapi.Update) {
msg := update.Message
for _, user := range msg.NewChatMembers {
rmsg := config.Message{
UserID: strconv.FormatInt(user.ID, 10),
Username: user.FirstName, // for some reason all the other name felids are empty on this event (at least for me)
Channel: strconv.FormatInt(msg.Chat.ID, 10),
Account: b.Account,
Protocol: b.Protocol,
Event: config.EventJoinLeave,
Text: "joined chat",
}
b.Remote <- rmsg
}
}
func (b *Btelegram) handleUserLeave(update tgbotapi.Update) {
msg := update.Message
user := msg.LeftChatMember
rmsg := config.Message{
UserID: strconv.FormatInt(user.ID, 10),
Username: user.FirstName, // for some reason all the other name felids are empty on this event (at least for me)
Channel: strconv.FormatInt(msg.Chat.ID, 10),
Account: b.Account,
Protocol: b.Protocol,
Event: config.EventJoinLeave,
Text: "left chat",
}
b.Remote <- rmsg
}
// handleDownloadAvatar downloads the avatar of userid from channel
// sends a EVENT_AVATAR_DOWNLOAD message to the gateway if successful.
// logs an error message if it fails
func (b *Btelegram) handleDownloadAvatar(userid int64, channel string) {
rmsg := config.Message{
Username: "system",
Text: "avatar",
Channel: channel,
Account: b.Account,
UserID: strconv.FormatInt(userid, 10),
Event: config.EventAvatarDownload,
Extra: make(map[string][]interface{}),
}
if _, ok := b.avatarMap[strconv.FormatInt(userid, 10)]; ok {
return
}
photos, err := b.c.GetUserProfilePhotos(tgbotapi.UserProfilePhotosConfig{UserID: userid, Limit: 1})
if err != nil {
b.Log.Errorf("Userprofile download failed for %#v %s", userid, err)
}
if len(photos.Photos) > 0 {
photo := photos.Photos[0][0]
url := b.getFileDirectURL(photo.FileID)
name := strconv.FormatInt(userid, 10) + ".png"
b.Log.Debugf("trying to download %#v fileid %#v with size %#v", name, photo.FileID, photo.FileSize)
err := helper.HandleDownloadSize(b.Log, &rmsg, name, int64(photo.FileSize), b.General)
if err != nil {
b.Log.Error(err)
return
}
data, err := helper.DownloadFile(url)
if err != nil {
b.Log.Errorf("download %s failed %#v", url, err)
return
}
helper.HandleDownloadData(b.Log, &rmsg, name, rmsg.Text, "", data, b.General)
b.Remote <- rmsg
}
}
func (b *Btelegram) maybeConvertTgs(name *string, data *[]byte) {
format := b.GetString("MediaConvertTgs")
if helper.SupportsFormat(format) {
b.Log.Debugf("Format supported by %s, converting %v", helper.LottieBackend(), name)
} else {
// Otherwise, no conversion was requested. Trying to run the usual webp
// converter would fail, because '.tgs.webp' is actually a gzipped JSON
// file, and has nothing to do with WebP.
return
}
err := helper.ConvertTgsToX(data, format, b.Log)
if err != nil {
b.Log.Errorf("conversion failed: %v", err)
} else {
*name = strings.Replace(*name, "tgs.webp", format, 1)
}
}
func (b *Btelegram) maybeConvertWebp(name *string, data *[]byte) {
if b.GetBool("MediaConvertWebPToPNG") {
b.Log.Debugf("WebP to PNG conversion enabled, converting %v", name)
err := helper.ConvertWebPToPNG(data)
if err != nil {
b.Log.Errorf("conversion failed: %v", err)
} else {
*name = strings.Replace(*name, ".webp", ".png", 1)
}
}
}
// handleDownloadFile handles file download
func (b *Btelegram) handleDownload(rmsg *config.Message, message *tgbotapi.Message) error {
size := int64(0)
var url, name, text string
switch {
case message.Sticker != nil:
text, name, url = b.getDownloadInfo(message.Sticker.FileID, ".webp", true)
size = int64(message.Sticker.FileSize)
case message.Voice != nil:
text, name, url = b.getDownloadInfo(message.Voice.FileID, ".ogg", true)
size = message.Voice.FileSize
case message.Video != nil:
text, name, url = b.getDownloadInfo(message.Video.FileID, "", true)
size = message.Video.FileSize
case message.Audio != nil:
text, name, url = b.getDownloadInfo(message.Audio.FileID, "", true)
size = message.Audio.FileSize
case message.Document != nil:
_, _, url = b.getDownloadInfo(message.Document.FileID, "", false)
size = message.Document.FileSize
name = message.Document.FileName
text = " " + message.Document.FileName + " : " + url
case message.Photo != nil:
photos := message.Photo
size = int64(photos[len(photos)-1].FileSize)
text, name, url = b.getDownloadInfo(photos[len(photos)-1].FileID, "", true)
}
// if name is empty we didn't match a thing to download
if name == "" {
return nil
}
// use the URL instead of native upload
if b.GetBool("UseInsecureURL") {
b.Log.Debugf("Setting message text to :%s", text)
rmsg.Text += text
return nil
}
// if we have a file attached, download it (in memory) and put a pointer to it in msg.Extra
err := helper.HandleDownloadSize(b.Log, rmsg, name, int64(size), b.General)
if err != nil {
return err
}
data, err := helper.DownloadFile(url)
if err != nil {
return err
}
if strings.HasSuffix(name, ".tgs.webp") {
b.maybeConvertTgs(&name, data)
} else if strings.HasSuffix(name, ".webp") {
b.maybeConvertWebp(&name, data)
}
// rename .oga to .ogg https://github.com/42wim/matterbridge/issues/906#issuecomment-741793512
if strings.HasSuffix(name, ".oga") && message.Audio != nil {
name = strings.Replace(name, ".oga", ".ogg", 1)
}
helper.HandleDownloadData(b.Log, rmsg, name, message.Caption, "", data, b.General)
return nil
}
func (b *Btelegram) getDownloadInfo(id string, suffix string, urlpart bool) (string, string, string) {
url := b.getFileDirectURL(id)
name := ""
if urlpart {
urlPart := strings.Split(url, "/")
name = urlPart[len(urlPart)-1]
}
if suffix != "" && !strings.HasSuffix(name, suffix) && !strings.HasSuffix(name, ".webm") {
name += suffix
}
text := " " + url
return text, name, url
}
// handleDelete handles message deleting
func (b *Btelegram) handleDelete(msg *config.Message, chatid int64) (string, error) {
if msg.ID == "" {
return "", nil
}
msgid, err := strconv.Atoi(msg.ID)
if err != nil {
return "", err
}
cfg := tgbotapi.NewDeleteMessage(chatid, msgid)
_, err = b.c.Request(cfg)
return "", err
}
// handleEdit handles message editing.
func (b *Btelegram) handleEdit(msg *config.Message, chatid int64) (string, error) {
msgid, err := strconv.Atoi(msg.ID)
if err != nil {
return "", err
}
if strings.ToLower(b.GetString("MessageFormat")) == HTMLNick {
b.Log.Debug("Using mode HTML - nick only")
msg.Text = html.EscapeString(msg.Text)
}
m := tgbotapi.NewEditMessageText(chatid, msgid, msg.Username+msg.Text)
switch b.GetString("MessageFormat") {
case HTMLFormat:
b.Log.Debug("Using mode HTML")
m.ParseMode = tgbotapi.ModeHTML
case "Markdown":
b.Log.Debug("Using mode markdown")
m.ParseMode = tgbotapi.ModeMarkdown
case MarkdownV2:
b.Log.Debug("Using mode MarkdownV2")
m.ParseMode = MarkdownV2
}
if strings.ToLower(b.GetString("MessageFormat")) == HTMLNick {
b.Log.Debug("Using mode HTML - nick only")
m.ParseMode = tgbotapi.ModeHTML
}
_, err = b.c.Send(m)
if err != nil {
return "", err
}
return "", nil
}
// handleUploadFile handles native upload of files
func (b *Btelegram) handleUploadFile(msg *config.Message, chatid int64, threadid int, parentID int) (string, error) {
var media []interface{}
for _, f := range msg.Extra["file"] {
fi := f.(config.FileInfo)
file := tgbotapi.FileBytes{
Name: fi.Name,
Bytes: *fi.Data,
}
if b.GetString("MessageFormat") == HTMLFormat {
fi.Comment = makeHTML(html.EscapeString(fi.Comment))
}
switch filepath.Ext(fi.Name) {
case ".jpg", ".jpe", ".png":
pc := tgbotapi.NewInputMediaPhoto(file)
if fi.Comment != "" {
pc.Caption, pc.ParseMode = TGGetParseMode(b, msg.Username, fi.Comment)
}
media = append(media, pc)
case ".mp4", ".m4v":
vc := tgbotapi.NewInputMediaVideo(file)
if fi.Comment != "" {
vc.Caption, vc.ParseMode = TGGetParseMode(b, msg.Username, fi.Comment)
}
media = append(media, vc)
case ".mp3", ".oga":
ac := tgbotapi.NewInputMediaAudio(file)
if fi.Comment != "" {
ac.Caption, ac.ParseMode = TGGetParseMode(b, msg.Username, fi.Comment)
}
media = append(media, ac)
case ".ogg":
voc := tgbotapi.NewVoice(chatid, file)
voc.Caption, voc.ParseMode = TGGetParseMode(b, msg.Username, fi.Comment)
voc.ReplyToMessageID = parentID
res, err := b.c.Send(voc)
if err != nil {
return "", err
}
return strconv.Itoa(res.MessageID), nil
default:
dc := tgbotapi.NewInputMediaDocument(file)
if fi.Comment != "" {
dc.Caption, dc.ParseMode = TGGetParseMode(b, msg.Username, fi.Comment)
}
media = append(media, dc)
}
}
return b.sendMediaFiles(msg, chatid, threadid, parentID, media)
}
func (b *Btelegram) handleQuote(message, quoteNick, quoteMessage string) string {
format := b.GetString("quoteformat")
if format == "" {
format = "{MESSAGE} (re @{QUOTENICK}: {QUOTEMESSAGE})"
}
quoteMessagelength := len([]rune(quoteMessage))
if b.GetInt("QuoteLengthLimit") != 0 && quoteMessagelength >= b.GetInt("QuoteLengthLimit") {
runes := []rune(quoteMessage)
quoteMessage = string(runes[0:b.GetInt("QuoteLengthLimit")])
if quoteMessagelength > b.GetInt("QuoteLengthLimit") {
quoteMessage += "..."
}
}
format = strings.Replace(format, "{MESSAGE}", message, -1)
format = strings.Replace(format, "{QUOTENICK}", quoteNick, -1)
format = strings.Replace(format, "{QUOTEMESSAGE}", quoteMessage, -1)
return format
}
// handleEntities handles messageEntities
func (b *Btelegram) handleEntities(rmsg *config.Message, message *tgbotapi.Message) {
if message.Entities == nil {
return
}
indexMovedBy := 0
prevLinkOffset := -1
for _, e := range message.Entities {
asRunes := utf16.Encode([]rune(rmsg.Text))
if e.Type == "text_link" {
offset := e.Offset + indexMovedBy
url, err := e.ParseURL()
if err != nil {
b.Log.Errorf("entity text_link url parse failed: %s", err)
continue
}
utfEncodedString := utf16.Encode([]rune(rmsg.Text))
if offset+e.Length > len(utfEncodedString) {
b.Log.Errorf("entity length is too long %d > %d", offset+e.Length, len(utfEncodedString))
continue
}
rmsg.Text = string(utf16.Decode(asRunes[:offset+e.Length])) + " (" + url.String() + ")" + string(utf16.Decode(asRunes[offset+e.Length:]))
indexMovedBy += len(url.String()) + 3
prevLinkOffset = e.Offset
}
if e.Offset == prevLinkOffset {
continue
}
if e.Type == "code" {
offset := e.Offset + indexMovedBy
rmsg.Text = string(utf16.Decode(asRunes[:offset])) + "`" + string(utf16.Decode(asRunes[offset:offset+e.Length])) + "`" + string(utf16.Decode(asRunes[offset+e.Length:]))
indexMovedBy += 2
}
if e.Type == "pre" {
offset := e.Offset + indexMovedBy
rmsg.Text = string(utf16.Decode(asRunes[:offset])) + "```\n" + string(utf16.Decode(asRunes[offset:offset+e.Length])) + "```\n" + string(utf16.Decode(asRunes[offset+e.Length:]))
indexMovedBy += 8
}
if e.Type == "bold" {
offset := e.Offset + indexMovedBy
rmsg.Text = string(utf16.Decode(asRunes[:offset])) + "*" + string(utf16.Decode(asRunes[offset:offset+e.Length])) + "*" + string(utf16.Decode(asRunes[offset+e.Length:]))
indexMovedBy += 2
}
if e.Type == "italic" {
offset := e.Offset + indexMovedBy
rmsg.Text = string(utf16.Decode(asRunes[:offset])) + "_" + string(utf16.Decode(asRunes[offset:offset+e.Length])) + "_" + string(utf16.Decode(asRunes[offset+e.Length:]))
indexMovedBy += 2
}
if e.Type == "strike" {
offset := e.Offset + indexMovedBy
rmsg.Text = string(utf16.Decode(asRunes[:offset])) + "~" + string(utf16.Decode(asRunes[offset:offset+e.Length])) + "~" + string(utf16.Decode(asRunes[offset+e.Length:]))
indexMovedBy += 2
}
}
}