# HG changeset patch
# User Matthew Wild <mwild1@gmail.com>
# Date 1620662498 -3600
# Node ID 7b8a482f4efd043eaa7d958422305eebd29a87d9
# Parent  c98aebe601f9ca50d1b9ab1a53cc1a22ec0caa3f
MUC: Add support for advertising muc#roomconfig_allowinvites in room disco#info

The de-facto interpretation of this (undocumented) option is to indicate to
the client whether it is allowed to invite other users to the MUC.

This is differs from the existing option in our config form, which only
controls the behaviour of sending of invites in a members-only MUC (we always
allow invites in open rooms).

Conversations is one client known to use this disco#info item to determine
whether it may send invites.

diff -r c98aebe601f9 -r 7b8a482f4efd plugins/muc/members_only.lib.lua
--- a/plugins/muc/members_only.lib.lua	Mon May 10 16:50:24 2021 +0100
+++ b/plugins/muc/members_only.lib.lua	Mon May 10 17:01:38 2021 +0100
@@ -61,12 +61,20 @@
 end
 
 module:hook("muc-disco#info", function(event)
-	event.reply:tag("feature", {var = get_members_only(event.room) and "muc_membersonly" or "muc_open"}):up();
+	local members_only_room = not not get_members_only(event.room);
+	local members_can_invite = not not get_allow_member_invites(event.room);
+	event.reply:tag("feature", {var = members_only_room and "muc_membersonly" or "muc_open"}):up();
 	table.insert(event.form, {
 		name = "{http://prosody.im/protocol/muc}roomconfig_allowmemberinvites";
 		label = "Allow members to invite new members";
 		type = "boolean";
-		value = not not get_allow_member_invites(event.room);
+		value = members_can_invite;
+	});
+	table.insert(event.form, {
+		name = "muc#roomconfig_allowinvites";
+		label = "Allow users to invite other users";
+		type = "boolean";
+		value = not members_only_room or members_can_invite;
 	});
 end);