prosody-modules
4c84cfb586c1
mod_muc_limits/mod_muc_limits.lua

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mod_muc_limits/mod_muc_limits.lua @ 5710:4c84cfb586c1

mod_http_admin_api: Support for adding/removing group MUCs
author Matthew Wild <mwild1@gmail.com>
date Thu, 02 Nov 2023 17:00:53 +0000
parent 5608:6680a1f53353
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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
1768
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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2 local mod_muc = module:depends"muc";
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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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)
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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;
554
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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6 local st = require "util.stanza";
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7 local new_throttle = require "util.throttle".create;
1038
edb06824a5a4 mod_muc_limits: Condense multiple dropped stanzas into a single log message every 5 seconds
Matthew Wild <mwild1@gmail.com>
parents: 1036
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8 local t_insert, t_concat = table.insert, table.concat;
554
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parents:
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9
557
14f39769c9e0 mod_muc_limits: Echo any MUC <x> or <body> in the error reply (required to make Gajim display the error)
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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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parents:
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14
1036
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
5566
f71d66bd87be mod_muc_limits: Add a limit on number of lines per message
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parents: 5564
diff changeset
16 local max_line_count = module:get_option_number("muc_max_line_count", 23); -- Default chosen through s/scientific methods/copy and paste/
5567
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
5608
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
f71d66bd87be mod_muc_limits: Add a limit on number of lines per message
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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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23 local dropped_jids;
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24
edb06824a5a4 mod_muc_limits: Condense multiple dropped stanzas into a single log message every 5 seconds
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parents: 1036
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25 local function log_dropped()
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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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28 dropped_jids = nil;
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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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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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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
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34 return;
2356ad05fdb6 mod_muc_limits: Don't limit room leaving
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parents: 554
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35 end
1042
5fd0860c86cd mod_muc_limits: Allow stanzas from affiliated users even if they are not in the room
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parents: 1040
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36 local dest_room, dest_host, dest_nick = jid_split(stanza.attr.to);
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1534d0715d35 mod_muc_limits: Add support for new MUC API in Prosody 0.11
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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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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)
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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)
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parents:
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41 module:log("debug", "Skipping stanza from affiliated user...");
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42 return;
1058
1255de347dd4 mod_muc_limits: Fix traceback on presence sent to the room's bare JID
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parents: 1057
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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
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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)
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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;
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48 end
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49 local throttle = room.throttle;
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50 if not room.throttle then
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51 throttle = new_throttle(period*burst, burst);
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52 room.throttle = throttle;
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53 end
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6680a1f53353 mod_muc_limits: Reduce cost of multi-line messages, make configurable
Kim Alvefur <zash@zash.se>
parents: 5567
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54 local cost = base_cost;
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parents: 3965
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55 local body = stanza:get_child_text("body");
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parents: 3965
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56 if body then
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parents: 3965
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57 -- TODO calculate a text diagonal cross-section or some mathemagical
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parents: 3965
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58 -- number, maybe some cost multipliers
5567
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parents: 5566
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59 if #body > max_char_count then
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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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61 :up():tag("x", { xmlns = xmlns_muc }));
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62 return true;
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63 end
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64 local body_lines = select(2, body:gsub("\n[^\n]*", ""));
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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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67 :tag("x", { xmlns = xmlns_muc; }));
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68 return true;
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parents: 5564
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69 end
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parents: 5567
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70 cost = cost + (body_lines * line_multiplier);
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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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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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75 dropped_jids = { [from_jid] = true, from_jid };
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76 module:add_timer(5, log_dropped);
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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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79 t_insert(dropped_jids, from_jid);
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80 end
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81 dropped_count = dropped_count + 1;
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parents: 1058
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82 if stanza.attr.type == "error" then -- We don't want to bounce errors
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83 return true;
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parents: 1058
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84 end
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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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86 if body then
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87 reply:up():tag("body"):text(body):up();
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88 end
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89 local x = stanza:get_child("x", xmlns_muc);
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90 if x then
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91 reply:add_child(st.clone(x));
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92 end
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parents: 556
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93 origin.send(reply);
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94 return true;
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95 end
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parents:
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96 end
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parents:
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97
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parents: 3418
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98 if rooms then
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99 function module.unload()
3964
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100 for room_jid, room in pairs(rooms) do --luacheck: ignore 213/room_jid
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101 room.throttle = nil;
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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)
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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)
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parents: 555
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104
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parents: 3402
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105 module:hook("presence/full", handle_stanza, 501);
3965
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106 if not join_only then
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107 module:hook("message/bare", handle_stanza, 501);
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parents: 3964
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108 module:hook("message/full", handle_stanza, 501);
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109 module:hook("presence/bare", handle_stanza, 501);
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parents: 3964
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110 end
3417
1534d0715d35 mod_muc_limits: Add support for new MUC API in Prosody 0.11
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parents: 3402
diff changeset
111 else
1534d0715d35 mod_muc_limits: Add support for new MUC API in Prosody 0.11
Kim Alvefur <zash@zash.se>
parents: 3402
diff changeset
112 module:hook("muc-occupant-pre-join", handle_stanza);
3965
2b10e51d85a6 mod_muc_limits: Add config option to limit to join stanzas only
Matthew Wild <mwild1@gmail.com>
parents: 3964
diff changeset
113 if not join_only then
2b10e51d85a6 mod_muc_limits: Add config option to limit to join stanzas only
Matthew Wild <mwild1@gmail.com>
parents: 3964
diff changeset
114 module:hook("muc-occupant-pre-change", handle_stanza);
2b10e51d85a6 mod_muc_limits: Add config option to limit to join stanzas only
Matthew Wild <mwild1@gmail.com>
parents: 3964
diff changeset
115 module:hook("muc-occupant-groupchat", handle_stanza);
2b10e51d85a6 mod_muc_limits: Add config option to limit to join stanzas only
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