mod_block_registrations: Allow restricting registrations of certain user accounts, and/or ensure that registered accounts conform to a given pattern
local st = require "util.stanza";
local nodeprep = require "util.encodings".stringprep.nodeprep;
local block_users = module:get_option_set("block_registrations_users", { "admin" });
local block_patterns = module:get_option_set("block_registrations_matching", {});
local require_pattern = module:get_option_string("block_registrations_require");
function is_blocked(username)
-- Check if the username is simply blocked
if block_users:contains(username) then return true; end
for pattern in block_patterns do
if username:match(pattern) then
return true;
end
end
-- Not blocked, but check that username matches allowed pattern
if require_pattern and not username:match(require_pattern) then
return true;
end
end
module:hook("stanza/iq/jabber:iq:register:query", function(event)
local session, stanza = event.origin, event.stanza;
if stanza.attr.type == "set" then
local query = stanza.tags[1];
local username = nodeprep(query:get_child_text("username"));
if username and is_blocked(username) then
session.send(st.error_reply(stanza, "modify", "policy-violation", "Username is blocked"));
return true;
end
end
end, 10);