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.

1 files changed, 10 insertions, 2 deletions

diff --git a/plugins/muc/members_only.lib.lua b/plugins/muc/members_only.lib.lua
index 4194c5c7..3220225f 100644
--- a/plugins/muc/members_only.lib.lua
+++ b/plugins/muc/members_only.lib.lua
@@ -61,12 +61,20 @@ local function set_allow_member_invites(room, allow_member_invites)
 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);