From 5bbe422161a8b924ef502c7ae6d60b01cb02ae46 Mon Sep 17 00:00:00 2001
From: Joseph Mansy <36427684+yousefmansy1@users.noreply.github.com>
Date: Mon, 3 Apr 2023 14:27:44 -0700
Subject: Support telegram chat Join/Leave updates (#2019)

Co-authored-by: Wim <wim@42.be>
---
 bridge/telegram/handlers.go | 46 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 46 insertions(+)

diff --git a/bridge/telegram/handlers.go b/bridge/telegram/handlers.go
index 9f8d1c38..efafa9d6 100644
--- a/bridge/telegram/handlers.go
+++ b/bridge/telegram/handlers.go
@@ -199,6 +199,8 @@ func (b *Btelegram) handleRecv(updates <-chan tgbotapi.Update) {
 			spew.Dump(update.Message)
 		}
 
+		b.handleGroupUpdate(update)
+
 		var message *tgbotapi.Message
 
 		rmsg := config.Message{Account: b.Account, Extra: make(map[string][]interface{})}
@@ -261,6 +263,50 @@ func (b *Btelegram) handleRecv(updates <-chan tgbotapi.Update) {
 	}
 }
 
+func (b *Btelegram) handleGroupUpdate(update tgbotapi.Update) {
+	msg := update.Message
+
+	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
-- 
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