local st = require "util.stanza";
local new_throttle = require "util.throttle".create;
local xmlns_muc = "http://jabber.org/protocol/muc";
local period = math.max(module:get_option_number("muc_event_rate", 0.5), 0);
local burst = math.max(module:get_option_number("muc_burst_factor", 6), 1);
local function handle_stanza(event)
local origin, stanza = event.origin, event.stanza;
if stanza.name == "presence" and stanza.attr.type == "unavailable" then -- Don't limit room leaving
return;
end
local dest_room, dest_host, dest_nick = jid.split(stanza.attr.to);
local room = hosts[module.host].modules.muc.rooms[dest_room.."@"..dest_host];
if not room then return; end
local from_jid = stanza.attr.from;
local occupant = room._occupants[room._jid_nick[from_jid]];
if occupant and occupant.affiliation then
module:log("debug", "Skipping stanza from affiliated user...");
return;
end
local throttle = room.throttle;
if not room.throttle then
throttle = new_throttle(period*burst, burst);
room.throttle = throttle;
end
if not throttle:poll(1) then
module:log("warn", "Dropping stanza for %s@%s from %s, over rate limit", dest_room, dest_host, from_jid);
local reply = st.error_reply(stanza, "wait", "policy-violation", "The room is currently overactive, please try again later");
local body = stanza:get_child_text("body");
if body then
reply:up():tag("body"):text(body):up();
end
local x = stanza:get_child("x", xmlns_muc);
if x then
reply:add_child(st.clone(x));
end
origin.send(reply);
return true;
end
end
function module.unload()
for room_jid, room in pairs(hosts[module.host].modules.muc.rooms) do
room.throttle = nil;
end
end
module:hook("message/bare", handle_stanza, 10);
module:hook("message/full", handle_stanza, 10);
module:hook("presence/bare", handle_stanza, 10);
module:hook("presence/full", handle_stanza, 10);