--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mod_muc_intercom/mod_muc_intercom.lua	Tue Aug 24 18:53:05 2010 +0200
@@ -0,0 +1,40 @@
+-- Relay messages between rooms
+-- By Kim Alvefur <zash@zash.se>
+
+local host_session = prosody.hosts[module.host];
+local st_msg = require "util.stanza".message;
+local jid = require "util.jid";
+
+function check_message(data)
+	local origin, stanza = data.origin, data.stanza;
+	local muc_rooms = host_session.muc and host_session.muc.rooms;
+	if not muc_rooms then return; end
+
+	local this_room = muc_rooms[stanza.attr.to];
+	if not this_room then return; end -- no such room
+
+	local from_room_jid = this_room._jid_nick[stanza.attr.from];
+	if not from_room_jid then return; end -- no such nick
+
+	local from_room, from_host, from_nick = jid.split(from_room_jid);
+
+	local body = stanza:get_child("body");
+	body = body and body:get_text(); -- I feel like I want to do `or ""` there :/
+	local target_room, message = body:match("^@([^:]+):(.*)");
+	if not target_room or not message then return; end
+
+	if target_room == from_room then return; end -- don't route to itself
+	module:log("debug", "target room is %s", target_room);
+
+	local bare_room = jid.join(target_room, from_host);
+	if not muc_rooms[bare_room] then return; end -- TODO send a error
+	module:log("info", "message from %s in %s to %s", from_nick, from_room, target_room);
+
+	local sender = jid.join(target_room, module.host, from_room .. "/" .. from_nick);
+	local forward_stanza = st_msg({from = sender, to = bare_room, type = "groupchat"}, message);
+
+	module:log("debug", "broadcasting message to target room");
+	muc_rooms[bare_room]:broadcast_message(forward_stanza);
+end
+
+module:hook("message/bare", check_message);