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annotate mod_muc_limits/mod_muc_limits.lua @ 1036:a44e755f7579

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mod_muc_limits: Add muc_max_nick_length option, defaulting to 23 (bytes)
author Matthew Wild <mwild1@gmail.com>
date Sat, 01 Jun 2013 23:02:40 +0100
parents 09a5082a8162
children edb06824a5a4
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2 local jid = require "util.jid";
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3 local st = require "util.stanza";
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4 local new_throttle = require "util.throttle".create;
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6 local xmlns_muc = "http://jabber.org/protocol/muc";
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8 local period = math.max(module:get_option_number("muc_event_rate", 0.5), 0);
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9 local burst = math.max(module:get_option_number("muc_burst_factor", 6), 1);
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11 local max_nick_length = module:get_option_number("muc_max_nick_length", 23); -- Default chosen through scientific methods
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13 local function handle_stanza(event)
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14 local origin, stanza = event.origin, event.stanza;
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15 if stanza.name == "presence" and stanza.attr.type == "unavailable" then -- Don't limit room leaving
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16 return;
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17 end
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18 local dest_room, dest_host, dest_nick = jid.split(stanza.attr.to);
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19 local room = hosts[module.host].modules.muc.rooms[dest_room.."@"..dest_host];
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20 if not room then return; end
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21 local from_jid = stanza.attr.from;
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22 local occupant = room._occupants[room._jid_nick[from_jid]];
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23 if occupant and occupant.affiliation then
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24 module:log("debug", "Skipping stanza from affiliated user...");
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25 return;
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26 elseif max_nick_length and stanza.name == "presence" and not room._occupants[stanza.attr.to] and #dest_nick > max_nick_length then
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27 module:log("debug", "Forbidding long (%d bytes) nick in %s", #dest_nick, dest_room)
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28 origin.send(st.error_reply(stanza, "modify", "policy-violation", "Your nick name is too long, please use a shorter one")
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29 :up():tag("x", { xmlns = xmlns_muc }));
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30 return true;
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31 end
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32 local throttle = room.throttle;
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33 if not room.throttle then
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34 throttle = new_throttle(period*burst, burst);
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35 room.throttle = throttle;
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36 end
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37 if not throttle:poll(1) then
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38 module:log("warn", "Dropping stanza for %s@%s from %s, over rate limit", dest_room, dest_host, from_jid);
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39 local reply = st.error_reply(stanza, "wait", "policy-violation", "The room is currently overactive, please try again later");
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40 local body = stanza:get_child_text("body");
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41 if body then
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42 reply:up():tag("body"):text(body):up();
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43 end
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44 local x = stanza:get_child("x", xmlns_muc);
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45 if x then
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46 reply:add_child(st.clone(x));
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47 end
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48 origin.send(reply);
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49 return true;
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50 end
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51 end
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53 function module.unload()
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54 for room_jid, room in pairs(hosts[module.host].modules.muc.rooms) do
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55 room.throttle = nil;
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56 end
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57 end
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59 module:hook("message/bare", handle_stanza, 10);
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60 module:hook("message/full", handle_stanza, 10);
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61 module:hook("presence/bare", handle_stanza, 10);
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62 module:hook("presence/full", handle_stanza, 10);