From ab9d041cef7b8eb6da405bd34aa002e8e37066ac Mon Sep 17 00:00:00 2001
From: Bohdan Horbeshko <bodqhrohro@gmail.com>
Date: Sun, 29 Jun 2025 11:37:36 -0400
Subject: [PATCH] Reject groupchat 1.0 join attempts

---
 xmpp/handlers.go | 18 ++++++++++++++----
 1 file changed, 14 insertions(+), 4 deletions(-)

diff --git a/xmpp/handlers.go b/xmpp/handlers.go
index e18f98b..ac0e11e 100644
--- a/xmpp/handlers.go
+++ b/xmpp/handlers.go
@@ -657,16 +657,26 @@ func tryHandleMUCPresence(s xmpp.Sender, p stanza.Presence) {
 		return
 	}
 
-	if !session.MUCHasResource(chatId, fromResource) {
-		return
-	}
-
 	component, ok := s.(*xmpp.Component)
 	if !ok {
 		log.Error("Not a component")
 		return
 	}
 
+	if !session.MUCHasResource(chatId, fromResource) {
+		// groupchat 1.0 join
+		gateway.SendPresence(
+			component,
+			p.From,
+			gateway.SPFullFrom(p.To),
+			gateway.SPType("unavailable"),
+			gateway.SPMUCAffiliation("none"),
+			gateway.SPMUCRole("none"),
+			gateway.SPMUCStatusCodes([]uint16{110, 307, 333}),
+		)
+		return
+	}
+
 	switch p.Type {
 	case "":
 		handleMUCNicknameChange(component, p, session, chatId, toBare)