From 90807b2d9e0565629a913d3b28b09c5fc9d746e6 Mon Sep 17 00:00:00 2001
From: Bohdan Horbeshko <bodqhrohro@gmail.com>
Date: Tue, 14 Mar 2023 17:16:02 -0400
Subject: Convert XEP-0461 replies to Telegram

---
 xmpp/handlers.go | 41 ++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 40 insertions(+), 1 deletion(-)

(limited to 'xmpp/handlers.go')

diff --git a/xmpp/handlers.go b/xmpp/handlers.go
index b023bc5..acf62a2 100644
--- a/xmpp/handlers.go
+++ b/xmpp/handlers.go
@@ -99,7 +99,46 @@ func HandleMessage(s xmpp.Sender, p stanza.Packet) {
 
 		toID, ok := toToID(msg.To)
 		if ok {
-			session.ProcessOutgoingMessage(toID, msg.Body, msg.From)
+			var reply extensions.Reply
+			var fallback extensions.Fallback
+			msg.Get(&reply)
+			msg.Get(&fallback)
+			log.Debugf("reply: %#v", reply)
+			log.Debugf("fallback: %#v", fallback)
+
+			var replyId int64
+			var err error
+			text := msg.Body
+			if len(reply.Id) > 0 {
+				id := reply.Id
+				if id[0] == 'e' {
+					id = id[1:]
+				}
+				replyId, err = strconv.ParseInt(id, 10, 64)
+				if err != nil {
+					log.Warn(errors.Wrap(err, "Failed to parse message ID!"))
+				}
+
+				if replyId != 0 && fallback.For == "urn:xmpp:reply:0" && len(fallback.Body) > 0 {
+					body := fallback.Body[0]
+					var start, end int64
+					start, err = strconv.ParseInt(body.Start, 10, 64)
+					if err != nil {
+						log.WithFields(log.Fields{
+							"start": body.Start,
+						}).Warn(errors.Wrap(err, "Failed to parse fallback start!"))
+					}
+					end, err = strconv.ParseInt(body.End, 10, 64)
+					if err != nil {
+						log.WithFields(log.Fields{
+							"end": body.End,
+						}).Warn(errors.Wrap(err, "Failed to parse fallback end!"))
+					}
+					text = text[:start] + text[end:]
+				}
+			}
+
+			session.ProcessOutgoingMessage(toID, text, msg.From, replyId)
 			return
 		} else {
 			toJid, err := stanza.NewJid(msg.To)
-- 
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