jiti-meet/resources/prosody-plugins/mod_muc_max_occupants.lua

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2018-11-03 15:45:59 +00:00
-- MUC Max Occupants
-- Configuring muc_max_occupants will set a limit of the maximum number
-- of participants that will be able to join in a room.
-- Participants in muc_access_whitelist will not be counted for the
-- max occupants value (values are jids like recorder@jitsi.meeet.example.com).
-- This module is configured under the muc component that is used for jitsi-meet
local split_jid = require "util.jid".split;
local st = require "util.stanza";
local it = require "util.iterators";
local whitelist = module:get_option_set("muc_access_whitelist");
local MAX_OCCUPANTS = module:get_option_number("muc_max_occupants", -1);
local function count_keys(t)
return it.count(it.keys(t));
end
local function check_for_max_occupants(event)
local room, origin, stanza = event.room, event.origin, event.stanza;
local actor = stanza.attr.from;
local user, domain, res = split_jid(stanza.attr.from);
--no user object means no way to check for max occupants
if user == nil then
return
end
-- If we're a whitelisted user joining the room, don't bother checking the max
-- occupants.
if whitelist and whitelist:contains(domain) or whitelist:contains(user..'@'..domain) then
return;
end
if room and not room._jid_nick[stanza.attr.from] then
local count = count_keys(room._occupants);
local slots = MAX_OCCUPANTS;
-- If there is no whitelist, just check the count.
if not whitelist and count >= MAX_OCCUPANTS then
module:log("info", "Attempt to enter a maxed out MUC");
origin.send(st.error_reply(stanza, "cancel", "service-unavailable"));
return true;
end
-- TODO: Are Prosody hooks atomic, or is this a race condition?
-- For each person in the room that's not on the whitelist, subtract one
-- from the count.
for _, occupant in room:each_occupant() do
if not whitelist:contains(domain) and not whitelist:contains(user..'@'..domain) then
slots = slots - 1
end
end
-- If the room is full (<0 slots left), error out.
if slots <= 0 then
module:log("info", "Attempt to enter a maxed out MUC");
origin.send(st.error_reply(stanza, "cancel", "service-unavailable"));
return true;
end
end
end
if MAX_OCCUPANTS > 0 then
module:hook("muc-occupant-pre-join", check_for_max_occupants, 10);
end