--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mod_alias/mod_alias.lua	Sat Nov 21 00:10:08 2015 -0500
@@ -0,0 +1,43 @@
+-- Copyright (C) 2015 Travis Burtrum
+-- This file is MIT/X11 licensed.
+
+-- set like so in prosody config, works on full or bare jids, or hosts:
+--aliases = {
+--		["old@example.net"] = "new@example.net";
+--		["you@example.com"] = "you@example.net";
+--		["conference.example.com"] = "conference.example.net";
+--}
+
+local aliases = module:get_option("aliases", {});
+local alias_response = module:get_option("alias_response", "User $alias can be contacted at $target");
+
+local st = require "util.stanza";
+
+function handle_alias(event)
+
+	if event.stanza.attr.type ~= "error" then
+		local alias = event.stanza.attr.to;
+		local target = aliases[alias];
+		if target then
+			local replacements = {
+				alias = alias,
+				target = target
+			};
+			local error_message = alias_response:gsub("%$([%w_]+)", function (v)
+					return replacements[v] or nil;
+				end);
+			local message = st.message{ type = "chat", from = alias, to = event.stanza.attr.from }:tag("body"):text(error_message);
+			module:send(message);
+			return event.origin.send(st.error_reply(event.stanza, "cancel", "gone", error_message));
+		end
+	end
+
+end
+
+module:hook("message/bare", handle_alias, 300);
+module:hook("message/full", handle_alias, 300);
+module:hook("message/host", handle_alias, 300);
+
+module:hook("presence/bare", handle_alias, 300);
+module:hook("presence/full", handle_alias, 300);
+module:hook("presence/host", handle_alias, 300);