--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/plugins/mod_server_contact_info.lua	Sat Sep 23 13:35:33 2017 +0100
@@ -0,0 +1,49 @@
+-- XEP-0157: Contact Addresses for XMPP Services for Prosody
+--
+-- Copyright (C) 2011-2016 Kim Alvefur
+--
+-- This file is MIT/X11 licensed.
+--
+
+local t_insert = table.insert;
+local array = require "util.array";
+local df_new = require "util.dataforms".new;
+
+-- Source: http://xmpp.org/registrar/formtypes.html#http:--jabber.org-network-serverinfo
+local valid_types = {
+	abuse = true;
+	admin = true;
+	feedback = true;
+	sales = true;
+	security = true;
+	support = true;
+}
+
+local contact_config = module:get_option("contact_info");
+if not contact_config or not next(contact_config) then -- we'll use admins from the config as default
+	local admins = module:get_option_inherited_set("admins", {});
+	if admins:empty() then
+		module:log("error", "No contact_info or admins set in config");
+		return -- Nothing to attach, so we'll just skip it.
+	end
+	module:log("info", "No contact_info in config, using admins as fallback");
+	contact_config = {
+		admin = array.collect( admins / function(admin) return "xmpp:" .. admin; end);
+	};
+end
+
+local form_layout = {
+	{ value = "http://jabber.org/network/serverinfo"; type = "hidden"; name = "FORM_TYPE"; };
+};
+
+local form_values = {};
+
+for t in pairs(valid_types) do
+	local addresses = contact_config[t];
+	if addresses then
+		t_insert(form_layout, { name = t .. "-addresses", type = "list-multi" });
+		form_values[t .. "-addresses"] = addresses;
+	end
+end
+
+module:add_extension(df_new(form_layout):form(form_values, "result"));