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annotate mod_muc_bot/mod_muc_bot.lua @ 4563:30f2d7c3f946

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mod_muc_bot: Attempt at module easing creation of stateless bots
author Kim Alvefur <zash@zash.se>
date Thu, 01 Apr 2021 13:15:05 +0200
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children d25f0fea270f
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30f2d7c3f946 mod_muc_bot: Attempt at module easing creation of stateless bots
Kim Alvefur <zash@zash.se>
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1 local st = require "util.stanza";
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2 local jid = require "util.jid";
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3
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4 local bots = module:get_option_set("known_bots", {});
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5
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6 module:hook("muc-occupant-groupchat", function(event)
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7 if event.occupant then return end -- skip messages from actual occupants
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8 local room = event.room;
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9
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10 if bots:contains(jid.bare(event.from)) or bots:contains(jid.host(event.from)) then
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11
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12 local nick = room:get_registered_nick(jid);
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13
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14 if not nick then
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Kim Alvefur <zash@zash.se>
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15 -- Allow bot to specify its own nick, but we're appending '[bot]' to it.
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Kim Alvefur <zash@zash.se>
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16 -- FIXME HATS!!!
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17 nick = event.stanza:get_child_text("nick", "http://jabber.org/protocol/nick");
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18 nick = (nick or jid.bare(event.from)) .. "[bot]";
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19 end
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20
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21 local virtual_occupant_jid = jid.prep(room.jid .. "/" .. nick, true);
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22 if not virtual_occupant_jid then
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23 module:send(st.error_reply(event.stanza, "modify", "jid-malformed", "Nickname must pass strict validation", room.jid));
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24 return true;
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25 end
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26
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27 -- Inject virtual occupant to trick all the other hooks on this event that
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Kim Alvefur <zash@zash.se>
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28 -- this is an actual legitimate participant.
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Kim Alvefur <zash@zash.se>
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29 -- XXX Hack!
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Kim Alvefur <zash@zash.se>
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30 event.occupant = {
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31 nick = virtual_occupant_jid;
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32 bare_jid = jid.bare(event.from);
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33 role = "participant";
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34 };
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35
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36 end
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37 end, 66);
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38
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39 module:hook("muc-occupant-pre-join", function(event)
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40 local room = event.room;
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41 local nick = jid.resource(event.occupant.nick);
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Kim Alvefur <zash@zash.se>
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42 if nick:sub(-5, -1) == "[bot]" then
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43 event.origin.send(st.error_reply(event.stanza, "modify", "policy-violation", "Only known bots may use the [bot] suffix", room.jid));
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44 return true;
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45 end
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46 end, 3);
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47
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48 module:hook("muc-occupant-pre-change", function(event)
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49 local room = event.room;
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50 local nick = jid.resource(event.dest_occupant.nick);
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51 if nick:sub(-5, -1) == "[bot]" then
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52 event.origin.send(st.error_reply(event.stanza, "modify", "policy-violation", "Only known bots may use the [bot] suffix", room.jid));
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53 return true;
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54 end
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55 end, 3);
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56
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57 assert(string.sub("foo[bot]", -5, -1) == "[bot]", "substring indicies, how do they work?");