local filters = require "util.filters";

local config = {}

config.file = module:get_option_string("crossdomain_file", "");

config.string = module:get_option_string("crossdomain_string", [[<?xml version="1.0"?><!DOCTYPE cross-domain-policy SYSTEM "/xml/dtds/cross-domain-policy.dt$

local string = ''

if not config.file ~= '' then

        local f = assert(io.open(config.file));

        string = f:read("*all");

else

        string = config.string

end

module:log("debug", "crossdomain string: "..string);

module:set_global();

function filter_policy(data, session)

        -- Since we only want to check the first block of data, remove the filter

        filters.remove_filter(session, "bytes/in", filter_policy);

        if data == "<policy-file-request/>\0" then

                session.send(string.."\0");

                return nil; -- Drop data to prevent it reaching the XMPP parser

        else

                return data; -- Pass data through, it wasn't a policy request

        end

end

function filter_session(session)

        if session.type == "c2s_unauthed" then

                filters.add_filter(session, "bytes/in", filter_policy, -1);

        end

end

function module.load()

        filters.add_filter_hook(filter_session);

end

function module.unload()

        filters.remove_filter_hook(filter_session);