From 8518868d4192e48f1f7529970dca3bae4364f43b Mon Sep 17 00:00:00 2001
From: Kim Alvefur <zash@zash.se>
Date: Sun, 24 Feb 2019 16:30:11 +0100
Subject: MUC: Fire an event to allow affecting decision of whether to allow a
 role change

---
 plugins/muc/muc.lib.lua | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/plugins/muc/muc.lib.lua b/plugins/muc/muc.lib.lua
index 2b6a7d76..a8d3d790 100644
--- a/plugins/muc/muc.lib.lua
+++ b/plugins/muc/muc.lib.lua
@@ -1369,6 +1369,18 @@ function room_mt:get_role(nick)
 end
 
 function room_mt:may_set_role(actor, occupant, role)
+	local event = {
+		room = self,
+		actor = actor,
+		occupant = occupant,
+		role = role,
+	};
+
+	module:fire_event("muc-pre-set-role", event);
+	if event.allowed ~= nil then
+		return event.allowed, event.error, event.condition;
+	end
+
 	-- Can't do anything to other owners or admins
 	local occupant_affiliation = self:get_affiliation(occupant.bare_jid);
 	if occupant_affiliation == "owner" or occupant_affiliation == "admin" then
-- 
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