Mercurial > prosody-modules

annotate mod_muc_limits/mod_muc_limits.lua @ 5648:c217f4edfc4f

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misc/mtail: Start of an mtail config Stashing it here in case anyone wants to continue working on it. Currently it's only counting log messages by level. Due to the permissions set by systemd on Prosody logs, mtail never managed to start correctly until permissions were manually relaxed.
author Kim Alvefur <zash@zash.se>
date Sun, 17 Sep 2023 13:36:30 +0200
parents 6680a1f53353
children
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rev   line source
1057
0b41122b19f9 mod_muc_limits: Abort loading on non-MUC hosts (thanks Ge0rG)
Matthew Wild <mwild1@gmail.com>
parents: 1042
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1
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163967467308 mod_muc_limits: Update to work with both the new and the old MUC API
Kim Alvefur <zash@zash.se>
parents: 1428
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2 local mod_muc = module:depends"muc";
163967467308 mod_muc_limits: Update to work with both the new and the old MUC API
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parents: 1428
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3 local rooms = rawget(mod_muc, "rooms"); -- Old MUC API
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a2b0174b5c48 mod_muc_limits: New module to impose overall rate-limits on a MUC (not on individual users)
Matthew Wild <mwild1@gmail.com>
parents:
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4
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5fd0860c86cd mod_muc_limits: Allow stanzas from affiliated users even if they are not in the room
Matthew Wild <mwild1@gmail.com>
parents: 1040
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5 local jid_split, jid_bare = require "util.jid".split, require "util.jid".bare;
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parents:
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6 local st = require "util.stanza";
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7 local new_throttle = require "util.throttle".create;
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parents: 1036
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8 local t_insert, t_concat = table.insert, table.concat;
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parents:
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9
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14f39769c9e0 mod_muc_limits: Echo any MUC <x> or <body> in the error reply (required to make Gajim display the error)
Matthew Wild <mwild1@gmail.com>
parents: 556
diff changeset
10 local xmlns_muc = "http://jabber.org/protocol/muc";
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parents: 556
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11
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a2b0174b5c48 mod_muc_limits: New module to impose overall rate-limits on a MUC (not on individual users)
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12 local period = math.max(module:get_option_number("muc_event_rate", 0.5), 0);
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parents:
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13 local burst = math.max(module:get_option_number("muc_burst_factor", 6), 1);
a2b0174b5c48 mod_muc_limits: New module to impose overall rate-limits on a MUC (not on individual users)
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14
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a44e755f7579 mod_muc_limits: Add muc_max_nick_length option, defaulting to 23 (bytes)
Matthew Wild <mwild1@gmail.com>
parents: 1035
diff changeset
15 local max_nick_length = module:get_option_number("muc_max_nick_length", 23); -- Default chosen through scientific methods
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f71d66bd87be mod_muc_limits: Add a limit on number of lines per message
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parents: 5564
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16 local max_line_count = module:get_option_number("muc_max_line_count", 23); -- Default chosen through s/scientific methods/copy and paste/
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d52cc18f0aa8 mod_muc_limits: Add a limit on number of bytes in a message body
Kim Alvefur <zash@zash.se>
parents: 5566
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17 local max_char_count = module:get_option_number("muc_max_char_count", 5664); -- Default chosen by multiplying a number by 23
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6680a1f53353 mod_muc_limits: Reduce cost of multi-line messages, make configurable
Kim Alvefur <zash@zash.se>
parents: 5567
diff changeset
18 local base_cost = math.max(module:get_option_number("muc_limit_base_cost", 1), 0);
6680a1f53353 mod_muc_limits: Reduce cost of multi-line messages, make configurable
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parents: 5567
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19 local line_multiplier = math.max(module:get_option_number("muc_line_count_multiplier", 0.1), 0);
5566
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parents: 5564
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20
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2b10e51d85a6 mod_muc_limits: Add config option to limit to join stanzas only
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parents: 3964
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21 local join_only = module:get_option_boolean("muc_limit_joins_only", false);
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parents: 1036
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22 local dropped_count = 0;
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parents: 1036
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23 local dropped_jids;
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parents: 1036
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24
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parents: 1036
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25 local function log_dropped()
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parents: 1036
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26 module:log("warn", "Dropped %d stanzas from %d JIDs: %s", dropped_count, #dropped_jids, t_concat(dropped_jids, ", "));
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27 dropped_count = 0;
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parents: 1036
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28 dropped_jids = nil;
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parents: 1036
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29 end
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a44e755f7579 mod_muc_limits: Add muc_max_nick_length option, defaulting to 23 (bytes)
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parents: 1035
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30
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parents:
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31 local function handle_stanza(event)
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32 local origin, stanza = event.origin, event.stanza;
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2356ad05fdb6 mod_muc_limits: Don't limit room leaving
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parents: 554
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33 if stanza.name == "presence" and stanza.attr.type == "unavailable" then -- Don't limit room leaving
2356ad05fdb6 mod_muc_limits: Don't limit room leaving
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parents: 554
diff changeset
34 return;
2356ad05fdb6 mod_muc_limits: Don't limit room leaving
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parents: 554
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35 end
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5fd0860c86cd mod_muc_limits: Allow stanzas from affiliated users even if they are not in the room
Matthew Wild <mwild1@gmail.com>
parents: 1040
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36 local dest_room, dest_host, dest_nick = jid_split(stanza.attr.to);
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parents: 3402
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37 local room = event.room or rooms[dest_room.."@"..dest_host];
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parents:
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38 if not room then return; end
a2b0174b5c48 mod_muc_limits: New module to impose overall rate-limits on a MUC (not on individual users)
Matthew Wild <mwild1@gmail.com>
parents:
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39 local from_jid = stanza.attr.from;
3418
9be9dd434813 mod_muc_limits: Simplify bypass for affiliated users
Kim Alvefur <zash@zash.se>
parents: 3417
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40 if room:get_affiliation(jid_bare(from_jid)) then
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a2b0174b5c48 mod_muc_limits: New module to impose overall rate-limits on a MUC (not on individual users)
Matthew Wild <mwild1@gmail.com>
parents:
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41 module:log("debug", "Skipping stanza from affiliated user...");
a2b0174b5c48 mod_muc_limits: New module to impose overall rate-limits on a MUC (not on individual users)
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parents:
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42 return;
1058
1255de347dd4 mod_muc_limits: Fix traceback on presence sent to the room's bare JID
Matthew Wild <mwild1@gmail.com>
parents: 1057
diff changeset
43 elseif dest_nick and 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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a44e755f7579 mod_muc_limits: Add muc_max_nick_length option, defaulting to 23 (bytes)
Matthew Wild <mwild1@gmail.com>
parents: 1035
diff changeset
44 module:log("debug", "Forbidding long (%d bytes) nick in %s", #dest_nick, dest_room)
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parents: 1035
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45 origin.send(st.error_reply(stanza, "modify", "policy-violation", "Your nick name is too long, please use a shorter one")
a44e755f7579 mod_muc_limits: Add muc_max_nick_length option, defaulting to 23 (bytes)
Matthew Wild <mwild1@gmail.com>
parents: 1035
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46 :up():tag("x", { xmlns = xmlns_muc }));
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parents: 1035
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47 return true;
554
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parents:
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48 end
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Matthew Wild <mwild1@gmail.com>
parents:
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49 local throttle = room.throttle;
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parents:
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50 if not room.throttle then
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parents:
diff changeset
51 throttle = new_throttle(period*burst, burst);
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parents:
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52 room.throttle = throttle;
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parents:
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53 end
5601
6680a1f53353 mod_muc_limits: Reduce cost of multi-line messages, make configurable
Kim Alvefur <zash@zash.se>
parents: 5567
diff changeset
54 local cost = base_cost;
5564
731ba9400c10 mod_muc_limits: Raise cost for multi-line messages
Kim Alvefur <zash@zash.se>
parents: 3965
diff changeset
55 local body = stanza:get_child_text("body");
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parents: 3965
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56 if body then
731ba9400c10 mod_muc_limits: Raise cost for multi-line messages
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parents: 3965
diff changeset
57 -- TODO calculate a text diagonal cross-section or some mathemagical
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parents: 3965
diff changeset
58 -- number, maybe some cost multipliers
5567
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Kim Alvefur <zash@zash.se>
parents: 5566
diff changeset
59 if #body > max_char_count then
d52cc18f0aa8 mod_muc_limits: Add a limit on number of bytes in a message body
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parents: 5566
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60 origin.send(st.error_reply(stanza, "modify", "policy-violation", "Your message is too long, please write a shorter one")
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parents: 5566
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61 :up():tag("x", { xmlns = xmlns_muc }));
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parents: 5566
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62 return true;
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parents: 5566
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63 end
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parents: 3965
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64 local body_lines = select(2, body:gsub("\n[^\n]*", ""));
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parents: 5564
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65 if body_lines > max_line_count then
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66 origin.send(st.error_reply(stanza, "modify", "policy-violation", "Your message is too long, please write a shorter one"):up()
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parents: 5564
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67 :tag("x", { xmlns = xmlns_muc; }));
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parents: 5564
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68 return true;
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parents: 5564
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69 end
5601
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parents: 5567
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70 cost = cost + (body_lines * line_multiplier);
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parents: 3965
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71 end
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parents: 3965
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72 if not throttle:poll(cost) then
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Matthew Wild <mwild1@gmail.com>
parents: 1036
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73 module:log("debug", "Dropping stanza for %s@%s from %s, over rate limit", dest_room, dest_host, from_jid);
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parents: 1036
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74 if not dropped_jids then
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parents: 1036
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75 dropped_jids = { [from_jid] = true, from_jid };
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parents: 1036
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76 module:add_timer(5, log_dropped);
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parents: 1036
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77 elseif not dropped_jids[from_jid] then
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parents: 1036
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78 dropped_jids[from_jid] = true;
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parents: 1036
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79 t_insert(dropped_jids, from_jid);
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Matthew Wild <mwild1@gmail.com>
parents: 1036
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80 end
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Matthew Wild <mwild1@gmail.com>
parents: 1036
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81 dropped_count = dropped_count + 1;
1205
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Kim Alvefur <zash@zash.se>
parents: 1058
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82 if stanza.attr.type == "error" then -- We don't want to bounce errors
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parents: 1058
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83 return true;
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parents: 1058
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84 end
557
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parents: 556
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85 local reply = st.error_reply(stanza, "wait", "policy-violation", "The room is currently overactive, please try again later");
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parents: 556
diff changeset
86 if body then
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Matthew Wild <mwild1@gmail.com>
parents: 556
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87 reply:up():tag("body"):text(body):up();
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parents: 556
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88 end
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Matthew Wild <mwild1@gmail.com>
parents: 556
diff changeset
89 local x = stanza:get_child("x", xmlns_muc);
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parents: 556
diff changeset
90 if x then
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parents: 556
diff changeset
91 reply:add_child(st.clone(x));
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parents: 556
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92 end
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Matthew Wild <mwild1@gmail.com>
parents: 556
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93 origin.send(reply);
554
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94 return true;
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parents:
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95 end
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Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
96 end
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Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
97
3449
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Kim Alvefur <zash@zash.se>
parents: 3418
diff changeset
98 if rooms then
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Kim Alvefur <zash@zash.se>
parents: 3418
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99 function module.unload()
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Matthew Wild <mwild1@gmail.com>
parents: 3449
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100 for room_jid, room in pairs(rooms) do --luacheck: ignore 213/room_jid
3449
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parents: 3418
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101 room.throttle = nil;
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Kim Alvefur <zash@zash.se>
parents: 3418
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102 end
556
e50bdbaa7802 mod_muc_limits: Remove throttle object from all rooms on unload (to make sure new settings are applied on reload)
Matthew Wild <mwild1@gmail.com>
parents: 555
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103 end
e50bdbaa7802 mod_muc_limits: Remove throttle object from all rooms on unload (to make sure new settings are applied on reload)
Matthew Wild <mwild1@gmail.com>
parents: 555
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104
3417
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Kim Alvefur <zash@zash.se>
parents: 3402
diff changeset
105 module:hook("presence/full", handle_stanza, 501);
3965
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Matthew Wild <mwild1@gmail.com>
parents: 3964
diff changeset
106 if not join_only then
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Matthew Wild <mwild1@gmail.com>
parents: 3964
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107 module:hook("message/bare", handle_stanza, 501);
2b10e51d85a6 mod_muc_limits: Add config option to limit to join stanzas only
Matthew Wild <mwild1@gmail.com>
parents: 3964
diff changeset
108 module:hook("message/full", handle_stanza, 501);
2b10e51d85a6 mod_muc_limits: Add config option to limit to join stanzas only
Matthew Wild <mwild1@gmail.com>
parents: 3964
diff changeset
109 module:hook("presence/bare", handle_stanza, 501);
2b10e51d85a6 mod_muc_limits: Add config option to limit to join stanzas only
Matthew Wild <mwild1@gmail.com>
parents: 3964
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110 end
3417
1534d0715d35 mod_muc_limits: Add support for new MUC API in Prosody 0.11
Kim Alvefur <zash@zash.se>
parents: 3402
diff changeset
111 else
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Kim Alvefur <zash@zash.se>
parents: 3402
diff changeset
112 module:hook("muc-occupant-pre-join", handle_stanza);
3965
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Matthew Wild <mwild1@gmail.com>
parents: 3964
diff changeset
113 if not join_only then
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Matthew Wild <mwild1@gmail.com>
parents: 3964
diff changeset
114 module:hook("muc-occupant-pre-change", handle_stanza);
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Matthew Wild <mwild1@gmail.com>
parents: 3964
diff changeset
115 module:hook("muc-occupant-groupchat", handle_stanza);
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Matthew Wild <mwild1@gmail.com>
parents: 3964
diff changeset
116 end
3417
1534d0715d35 mod_muc_limits: Add support for new MUC API in Prosody 0.11
Kim Alvefur <zash@zash.se>
parents: 3402
diff changeset
117 end