Changeset

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mod_muc_local_only/README.markdown	Wed May 13 11:43:27 2020 +0100
@@ -0,0 +1,36 @@
+# Introduction
+
+This module allows you to make one or more MUCs as accessible to local users only.
+
+# Details
+
+Local users (anyone on the same server as the MUC) are granted automatic
+membership when they first join the room. Users from other servers are
+denied access (even if the room is otherwise configured to be open).
+
+# Configuring
+
+## Enabling
+
+``` {.lua}
+Component "rooms.example.net" "muc"
+modules_enabled = {
+    "muc_local_only";
+}
+```
+
+## Settings
+
+Specify a list of MUCs in your config like so:
+
+```
+muc_local_only = { "my-local-chat@conference.example.com" }
+```
+
+# Compatibility
+
+Requires Prosody 0.11.0 or later.
+
+# Future
+
+It would be good to add a room configuration option.

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mod_muc_local_only/mod_muc_local_only.lua	Wed May 13 11:43:27 2020 +0100
@@ -0,0 +1,19 @@
+local jid = require "util.jid";
+local st = require "util.stanza";
+
+local local_rooms = module:get_option_inherited_set("muc_local_only", {});
+
+module:hook("muc-occupant-pre-join", function (event)
+	local room = event.room;
+	if not local_rooms:contains(room.jid) then
+		return; -- Not a protected room, ignore
+	end
+	local user_jid = event.occupant.bare_jid;
+	local user_host = jid.host(user_jid);
+	if not prosody.hosts[user_host] then
+		local error_reply = st.error_reply(event.stanza, "cancel", "forbidden", "This group is only available to local users", room.jid);
+		event.origin.send(error_reply);
+		return true;
+	end
+	room:set_affiliation(true, user_jid, "member", "Granting access to local user");
+end);