matterbridge/bridge/telegram/handlers.go

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package btelegram
import (
"html"
"regexp"
"strconv"
"strings"
"unicode/utf16"
"github.com/42wim/matterbridge/bridge/config"
"github.com/42wim/matterbridge/bridge/helper"
tgbotapi "github.com/go-telegram-bot-api/telegram-bot-api"
)
func (b *Btelegram) handleUpdate(rmsg *config.Message, message, posted, edited *tgbotapi.Message) *tgbotapi.Message {
// handle channels
if posted != nil {
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.ForwardFrom == nil {
rmsg.Text = "Forwarded from " + unknownUser + ": " + rmsg.Text
return
}
usernameForward := ""
if b.GetBool("UseFirstName") {
usernameForward = message.ForwardFrom.FirstName
}
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) {
if message.ReplyToMessage != nil {
usernameReply := ""
if message.ReplyToMessage.From != nil {
if b.GetBool("UseFirstName") {
usernameReply = message.ReplyToMessage.From.FirstName
}
if usernameReply == "" {
usernameReply = message.ReplyToMessage.From.UserName
if usernameReply == "" {
usernameReply = message.ReplyToMessage.From.FirstName
}
}
}
if usernameReply == "" {
usernameReply = unknownUser
}
if !b.GetBool("QuoteDisable") {
rmsg.Text = b.handleQuote(rmsg.Text, usernameReply, message.ReplyToMessage.Text)
}
}
}
// 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.Itoa(message.From.ID)
if b.GetBool("UseFirstName") {
rmsg.Username = message.From.FirstName
}
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 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.Error("Getting nil messages, this shouldn't happen.")
continue
}
var message *tgbotapi.Message
rmsg := config.Message{Account: b.Account, Extra: make(map[string][]interface{})}
// handle channels
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message = b.handleChannels(&rmsg, message, update)
// handle groups
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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)
// 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)
// handle entities (adding URLs)
b.handleEntities(&rmsg, message)
if rmsg.Text != "" || len(rmsg.Extra) > 0 {
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.Itoa(message.From.ID), 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
}
}
}
// 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 int, channel string) {
rmsg := config.Message{Username: "system",
Text: "avatar",
Channel: channel,
Account: b.Account,
UserID: strconv.Itoa(userid),
Event: config.EventAvatarDownload,
Extra: make(map[string][]interface{})}
if _, ok := b.avatarMap[strconv.Itoa(userid)]; !ok {
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.Itoa(userid) + ".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) {
var format string
switch b.GetString("MediaConvertTgs") {
case FormatWebp:
b.Log.Debugf("Tgs to WebP conversion enabled, converting %v", name)
format = FormatWebp
case FormatPng:
// The WebP to PNG converter can't handle animated webp files yet,
// and I'm not going to write a path for x/image/webp.
// The error message would be:
// conversion failed: webp: non-Alpha VP8X is not implemented
// So instead, we tell lottie to directly go to PNG.
b.Log.Debugf("Tgs to PNG conversion enabled, converting %v", name)
format = FormatPng
default:
// 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 := 0
var url, name, text string
switch {
case message.Sticker != nil:
text, name, url = b.getDownloadInfo(message.Sticker.FileID, ".webp", true)
size = 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 = 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)
}
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) {
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
}
_, err = b.c.DeleteMessage(tgbotapi.DeleteMessageConfig{ChatID: chatid, MessageID: msgid})
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) string {
var c tgbotapi.Chattable
for _, f := range msg.Extra["file"] {
fi := f.(config.FileInfo)
file := tgbotapi.FileBytes{
Name: fi.Name,
Bytes: *fi.Data,
}
re := regexp.MustCompile(".(jpg|png)$")
if re.MatchString(fi.Name) {
c = tgbotapi.NewPhotoUpload(chatid, file)
} else {
c = tgbotapi.NewDocumentUpload(chatid, file)
}
_, err := b.c.Send(c)
if err != nil {
b.Log.Errorf("file upload failed: %#v", err)
}
if fi.Comment != "" {
if _, err := b.sendMessage(chatid, msg.Username, fi.Comment); err != nil {
b.Log.Errorf("posting file comment %s failed: %s", fi.Comment, err)
}
}
}
return ""
}
func (b *Btelegram) handleQuote(message, quoteNick, quoteMessage string) string {
format := b.GetString("quoteformat")
if format == "" {
format = "{MESSAGE} (re @{QUOTENICK}: {QUOTEMESSAGE})"
}
quoteMessagelength := len(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
}
// for now only do URL replacements
for _, e := range *message.Entities {
if e.Type == "text_link" {
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 e.Offset+e.Length > len(utfEncodedString) {
b.Log.Errorf("entity length is too long %d > %d", e.Offset+e.Length, len(utfEncodedString))
continue
}
link := utf16.Decode(utfEncodedString[e.Offset : e.Offset+e.Length])
rmsg.Text = strings.Replace(rmsg.Text, string(link), url.String(), 1)
}
}
}