1 files changed, 205 insertions, 0 deletions
diff --git a/teleirc/matterbridge/bridge/telegram/telegram.go b/teleirc/matterbridge/bridge/telegram/telegram.go
new file mode 100644
index 0000000..43cb818
--- /dev/null
+++ b/teleirc/matterbridge/bridge/telegram/telegram.go
@@ -0,0 +1,205 @@
+package btelegram
+
+import (
+	"fmt"
+	"html"
+	"log"
+	"strconv"
+	"strings"
+
+	"github.com/42wim/matterbridge/bridge"
+	"github.com/42wim/matterbridge/bridge/config"
+	"github.com/42wim/matterbridge/bridge/helper"
+	tgbotapi "github.com/go-telegram-bot-api/telegram-bot-api/v5"
+)
+
+const (
+	unknownUser = "unknown"
+	HTMLFormat  = "HTML"
+	HTMLNick    = "htmlnick"
+	MarkdownV2  = "MarkdownV2"
+)
+
+type Btelegram struct {
+	c *tgbotapi.BotAPI
+	*bridge.Config
+	avatarMap map[string]string // keep cache of userid and avatar sha
+}
+
+func New(cfg *bridge.Config) bridge.Bridger {
+	tgsConvertFormat := cfg.GetString("MediaConvertTgs")
+	if tgsConvertFormat != "" {
+		err := helper.CanConvertTgsToX()
+		if err != nil {
+			log.Fatalf("Telegram bridge configured to convert .tgs files to '%s', but %s does not appear to work:\n%#v", tgsConvertFormat, helper.LottieBackend(), err)
+		}
+		if !helper.SupportsFormat(tgsConvertFormat) {
+			log.Fatalf("Telegram bridge configured to convert .tgs files to '%s', but %s doesn't support it.", tgsConvertFormat, helper.LottieBackend())
+		}
+	}
+	return &Btelegram{Config: cfg, avatarMap: make(map[string]string)}
+}
+
+func (b *Btelegram) Connect() error {
+	var err error
+	b.Log.Info("Connecting")
+	b.c, err = tgbotapi.NewBotAPI(b.GetString("Token"))
+	if err != nil {
+		b.Log.Debugf("%#v", err)
+		return err
+	}
+	u := tgbotapi.NewUpdate(0)
+	u.Timeout = 60
+	updates := b.c.GetUpdatesChan(u)
+	b.Log.Info("Connection succeeded")
+	go b.handleRecv(updates)
+	return nil
+}
+
+func (b *Btelegram) Disconnect() error {
+	return nil
+}
+
+func (b *Btelegram) JoinChannel(channel config.ChannelInfo) error {
+	return nil
+}
+
+func TGGetParseMode(b *Btelegram, username string, text string) (textout string, parsemode string) {
+	textout = username + text
+	if b.GetString("MessageFormat") == HTMLFormat {
+		b.Log.Debug("Using mode HTML")
+		parsemode = tgbotapi.ModeHTML
+	}
+	if b.GetString("MessageFormat") == "Markdown" {
+		b.Log.Debug("Using mode markdown")
+		parsemode = tgbotapi.ModeMarkdown
+	}
+	if b.GetString("MessageFormat") == MarkdownV2 {
+		b.Log.Debug("Using mode MarkdownV2")
+		parsemode = MarkdownV2
+	}
+	if strings.ToLower(b.GetString("MessageFormat")) == HTMLNick {
+		b.Log.Debug("Using mode HTML - nick only")
+		textout = username + html.EscapeString(text)
+		parsemode = tgbotapi.ModeHTML
+	}
+	return textout, parsemode
+}
+
+func (b *Btelegram) Send(msg config.Message) (string, error) {
+	b.Log.Debugf("=> Receiving %#v", msg)
+
+	// get the chatid
+	chatid, err := strconv.ParseInt(msg.Channel, 10, 64)
+	if err != nil {
+		return "", err
+	}
+
+	// map the file SHA to our user (caches the avatar)
+	if msg.Event == config.EventAvatarDownload {
+		return b.cacheAvatar(&msg)
+	}
+
+	if b.GetString("MessageFormat") == HTMLFormat {
+		msg.Text = makeHTML(html.EscapeString(msg.Text))
+	}
+
+	// Delete message
+	if msg.Event == config.EventMsgDelete {
+		return b.handleDelete(&msg, chatid)
+	}
+
+	// Handle prefix hint for unthreaded messages.
+	if msg.ParentNotFound() {
+		msg.ParentID = ""
+		msg.Text = fmt.Sprintf("[reply]: %s", msg.Text)
+	}
+
+	var parentID int
+	if msg.ParentID != "" {
+		parentID, _ = b.intParentID(msg.ParentID)
+	}
+
+	// Upload a file if it exists
+	if msg.Extra != nil {
+		for _, rmsg := range helper.HandleExtra(&msg, b.General) {
+			if _, msgErr := b.sendMessage(chatid, rmsg.Username, rmsg.Text, parentID); msgErr != nil {
+				b.Log.Errorf("sendMessage failed: %s", msgErr)
+			}
+		}
+		// check if we have files to upload (from slack, telegram or mattermost)
+		if len(msg.Extra["file"]) > 0 {
+			return b.handleUploadFile(&msg, chatid, parentID)
+		}
+	}
+
+	// edit the message if we have a msg ID
+	if msg.ID != "" {
+		return b.handleEdit(&msg, chatid)
+	}
+
+	// Post normal message
+	// TODO: recheck it.
+	// Ignore empty text field needs for prevent double messages from whatsapp to telegram
+	// when sending media with text caption
+	if msg.Text != "" {
+		return b.sendMessage(chatid, msg.Username, msg.Text, parentID)
+	}
+
+	return "", nil
+}
+
+func (b *Btelegram) getFileDirectURL(id string) string {
+	res, err := b.c.GetFileDirectURL(id)
+	if err != nil {
+		return ""
+	}
+	return res
+}
+
+func (b *Btelegram) sendMessage(chatid int64, username, text string, parentID int) (string, error) {
+	m := tgbotapi.NewMessage(chatid, "")
+	m.Text, m.ParseMode = TGGetParseMode(b, username, text)
+	m.ReplyToMessageID = parentID
+	m.DisableWebPagePreview = b.GetBool("DisableWebPagePreview")
+
+	res, err := b.c.Send(m)
+	if err != nil {
+		return "", err
+	}
+	return strconv.Itoa(res.MessageID), nil
+}
+
+// sendMediaFiles native upload media files via media group
+func (b *Btelegram) sendMediaFiles(msg *config.Message, chatid int64, parentID int, media []interface{}) (string, error) {
+	if len(media) == 0 {
+		return "", nil
+	}
+	mg := tgbotapi.MediaGroupConfig{ChatID: chatid, ChannelUsername: msg.Username, Media: media, ReplyToMessageID: parentID}
+	messages, err := b.c.SendMediaGroup(mg)
+	if err != nil {
+		return "", err
+	}
+	// return first message id
+	return strconv.Itoa(messages[0].MessageID), nil
+}
+
+// intParentID return integer parent id for telegram message
+func (b *Btelegram) intParentID(parentID string) (int, error) {
+	pid, err := strconv.Atoi(parentID)
+	if err != nil {
+		return 0, err
+	}
+	return pid, nil
+}
+
+func (b *Btelegram) cacheAvatar(msg *config.Message) (string, error) {
+	fi := msg.Extra["file"][0].(config.FileInfo)
+	/* if we have a sha we have successfully uploaded the file to the media server,
+	so we can now cache the sha */
+	if fi.SHA != "" {
+		b.Log.Debugf("Added %s to %s in avatarMap", fi.SHA, msg.UserID)
+		b.avatarMap[msg.UserID] = fi.SHA
+	}
+	return "", nil
+}