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annotate mod_throttle_unsolicited/mod_throttle_unsolicited.lua @ 2082:163d55777ad5

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mod_throttle_unsolicited: Limit rate of unsolicited messages sent to non-contacts
author Kim Alvefur <zash@zash.se>
date Mon, 14 Mar 2016 13:36:50 +0100
parents
children f6dcfe263b85
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rev   line source
2082
163d55777ad5 mod_throttle_unsolicited: Limit rate of unsolicited messages sent to non-contacts
Kim Alvefur <zash@zash.se>
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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
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7 local sessions = prosody.full_sessions;
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8
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9 local max = module:get_option_number("unsolicited_messages_per_minute", 10);
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10 local multiplier = module:get_option_number("throttle_unsolicited_burst", 1);
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11
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12 function check_subscribed(event)
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13 local stanza, origin = event.stanza, event.origin;
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14 local log = origin.log or module._log;
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15 log("debug", "check_subscribed(%s)", stanza:top_tag());
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16 if stanza.attr.type == "error" then return end
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17
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18 -- Check if it's a message to a joined room
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19 local to_bare = jid_bare(stanza.attr.to);
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20 local rooms = origin.rooms_joined;
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21 if rooms and rooms[to_bare] then
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22 log("debug", "Message to joined room, no limit");
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23 return
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24 end
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25
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26 -- Retrieve or create throttle object
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Kim Alvefur <zash@zash.se>
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27 local lim = origin.throttle_unsolicited;
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28 if not lim then
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29 log("debug", "New throttle");
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30 lim = throttle.create(max * multiplier, 60 * multiplier);
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31 origin.throttle_unsolicited = lim;
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32 end
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33
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34 local to_user, to_host = jid_split(stanza.attr.to);
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35 local from_jid = jid_bare(stanza.attr.from);
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36 if to_user and not is_contact_subscribed(to_user, to_host, from_jid) then
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37 log("debug", "%s is not subscribed to %s@%s", from_jid, to_user, to_host);
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38 if not lim:poll(1) then
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39 log("warn", "Sent too many messages to non-contacts, bouncing message");
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40 event.origin.send(st.error_reply(stanza, "cancel", "service-unavailable"));
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41 return true;
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42 end
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43 end
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44 end
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45
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46 module:hook("pre-message/bare", check_subscribed, 200);
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47 module:hook("pre-message/full", check_subscribed, 200);
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48
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49 module:depends("track_muc_joins");