diff -r fa7e402fcdc1 -r 4e14ad802d58 mod_idlecompat/mod_idlecompat.lua
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mod_idlecompat/mod_idlecompat.lua	Fri Jan 03 11:54:13 2014 +0100
@@ -0,0 +1,31 @@
+-- Last User Interaction in Presence via Last Activity compatibility module
+-- http://xmpp.org/extensions/xep-0319.html
+-- http://xmpp.org/extensions/xep-0012.html
+-- Copyright (C) 2014 Tobias Markmann
+--
+-- This file is MIT/X11 licensed.
+
+local st = require "util.stanza";
+local datetime = require "util.datetime";
+
+local function on_presence(event)
+	local stanza = event.stanza;
+
+	local last_activity = stanza.name == "presence" and stanza:get_child("query", "jabber:iq:last") or false;
+	local has_idle = stanza:get_child("idle", "urn:xmpp:idle:1");
+	if last_activity and not has_idle then
+		module:log("debug", "Adding XEP-0319 tag from Last Activity.");
+		local seconds = last_activity.attr.seconds;
+		local last_userinteraction = datetime.datetime(os.time() - seconds);
+		stanza:tag("idle", { xmlns = "urn:xmpp:idle:1", since = last_userinteraction }):up();
+	end
+end
+
+-- incoming
+module:hook("presence/full", on_presence, 900);
+module:hook("presence/bare", on_presence, 900);
+
+-- outgoing
+module:hook("pre-presence/bare", on_presence, 900);
+module:hook("pre-presence/full", on_presence, 900);
+module:hook("pre-presence/host", on_presence, 900);
\ No newline at end of file