From 20718dfc1606a40158d5143b873b9f47db619a55 Mon Sep 17 00:00:00 2001
From: Val Lorentz <progval+git@progval.net>
Date: Fri, 26 Jul 2024 14:11:08 +0200
Subject: [PATCH] Add ISUPPORT CLIENTTAGDENY=*

---
 sable_ircd/src/server/mod.rs | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/sable_ircd/src/server/mod.rs b/sable_ircd/src/server/mod.rs
index 1c983dd..0dd4ec2 100644
--- a/sable_ircd/src/server/mod.rs
+++ b/sable_ircd/src/server/mod.rs
@@ -188,6 +188,11 @@ impl ClientServer {
 
         ret.add(ISupportEntry::string("CASEMAPPING", "ascii"));
 
+        // https://ircv3.net/specs/extensions/message-tags#rpl_isupport-tokens
+        // Tell clients all client tags are rejected, so conforming clients won't
+        // even try to send TAGMSG (which we don't support yet).
+        ret.add(ISupportEntry::string("CLIENTTAGDENY", "*"));
+
         ret.add(ISupportEntry::int(
             "HOSTLEN",
             Hostname::LENGTH.try_into().unwrap(),