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Travis Burtrum 7 years ago
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  1. 57
      README.markdown
  2. 43
      mod_alias.lua
  3. 20
      mod_alias_postfixadmin.sh

57
README.markdown

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---
summary: Point alias accounts or domains to correct XMPP user
...
Introduction
============
This module allows you to set up aliases that alert people who try to
contact them or add them to their roster what your actual JID is. This
is useful for changing JIDs, or just in the case where you own both
example.com and example.net, and want people who contact you@example.com
to be alerted to contact you at you@example.net instead.
This type of aliasing is well supported in the email world, but very hard
to handle with XMPP, this module sidesteps all the hard problems by just
sending the user a helpful message, requiring humans to decide what they
actually want to do.
This doesn't require any special support on other clients or servers,
just the ability to recieve messages.
Configuration
=============
Add the module to the `modules_enabled` list.
modules_enabled = {
...
"alias";
}
Then set up your list of aliases, aliases can be 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";
}
You can also set up a custom response, by default it is:
alias_response = "User $alias can be contacted at $target";
A script named mod_alias_postfixadmin.sh is included in this directory to
generate the aliases array directly from a postfixadmin MySQL database.
Instructions for use are included in the script.
Compatibility
=============
------- --------------
trunk Works
0.10 Works
0.9 Unknown
0.8 Unknown
------- --------------

43
mod_alias.lua

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-- 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);

20
mod_alias_postfixadmin.sh

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#!/bin/sh
# Copyright (C) 2015 Travis Burtrum
# This file is MIT/X11 licensed.
# run like ./mod_alias_postfixadmin.sh "mysql -N -upostfixadmin -ppostfixadmin postfixadmin" > /etc/prosody/aliases.cfg.lua
# then put:
# Include "aliases.cfg.lua"
# in prosody.cfg.lua
mysql="$1"
echo "-- alias plugin, generated by mod_alias_postfixadmin.sh"
echo "aliases = {"
echo "SELECT concat('["'"'"', address, '"'"'"] = "'"'"', goto, '"'"'";') FROM alias WHERE address != goto;
SELECT concat('["'"'"', address, '"'"'"] = "'"'"', goto, '"'"'";') FROM (
select replace(address, concat('@', target_domain), concat('@', alias_domain)) as address, goto FROM alias JOIN alias_domain ON alias_domain.target_domain = SUBSTRING(alias.address, locate('@',alias.address) + 1, length(alias.address))
) a WHERE a.address != a.goto;" | $mysql | sort | uniq
echo "}"
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