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annotate mod_throttle_unsolicited/mod_throttle_unsolicited.lua @ 2155:f24b02e0d706

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mod_presence_dedup: Attempt at saving bandwith by deduplicating presence stanzas
author Kim Alvefur <zash@zash.se>
date Sun, 03 Apr 2016 17:09:03 +0200
parents 7cab309a26b2
children 1424aa8877f0
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163d55777ad5 mod_throttle_unsolicited: Limit rate of unsolicited messages sent to non-contacts
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1 local st = require"util.stanza";
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2 local jid_split = require "util.jid".split;
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3 local jid_bare = require "util.jid".bare;
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4 local is_contact_subscribed = require "core.rostermanager".is_contact_subscribed;
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5 local throttle = require "util.throttle";
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6 local gettime = require "socket".gettime;
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7
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8 local max = module:get_option_number("unsolicited_messages_per_minute", 10);
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9 local multiplier = module:get_option_number("throttle_unsolicited_burst", 1);
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10
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11 function check_subscribed(event)
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12 local stanza, origin = event.stanza, event.origin;
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13 local log = origin.log or module._log;
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14 log("debug", "check_subscribed(%s)", stanza:top_tag());
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15 if stanza.attr.type == "error" then return end
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16
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17 local to_orig = stanza.attr.to;
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18 if to_orig == nil or to_orig == origin.full_jid then return end -- to self
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19
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20 local to_bare = jid_bare(to_orig);
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21 local from_jid = jid_bare(stanza.attr.from);
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22 if to_bare == from_jid then return end -- to own resource
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23
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24 -- Check if it's a message to a joined room
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25 local rooms = origin.rooms_joined;
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26 if rooms and rooms[to_bare] then
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27 log("debug", "Message to joined room, no limit");
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28 return
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29 end
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30
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31 -- Retrieve or create throttle object
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32 local lim = origin.throttle_unsolicited;
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33 if not lim then
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34 log("debug", "New throttle");
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35 lim = throttle.create(max * multiplier, 60 * multiplier);
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36 origin.throttle_unsolicited = lim;
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37 end
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38
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39 local to_user, to_host = jid_split(to_orig);
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40 if to_user and not is_contact_subscribed(to_user, to_host, from_jid) then
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41 log("debug", "%s is not subscribed to %s@%s", from_jid, to_user, to_host);
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42 if not lim:poll(1) then
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43 log("warn", "Sent too many messages to non-contacts, bouncing message");
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44 event.origin.firewall_mark_throttle_unsolicited = gettime();
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45 event.origin.send(st.error_reply(stanza, "cancel", "service-unavailable"));
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46 return true;
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47 end
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48 end
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49 end
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50
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51 module:hook("pre-message/bare", check_subscribed, 200);
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52 module:hook("pre-message/full", check_subscribed, 200);
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53
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54 module:depends("track_muc_joins");