prosody-modules
c20a0c8a54ea
mod_muc_limits/mod_muc_limits.lua

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mod_muc_limits/mod_muc_limits.lua @ 5885:c20a0c8a54ea

mod_auth_oauth_external: Fix typo
author Kim Alvefur <zash@zash.se>
date Sat, 09 Mar 2024 21:05:00 +0100
parent 5608:6680a1f53353
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
1057
0b41122b19f9 mod_muc_limits: Abort loading on non-MUC hosts (thanks Ge0rG)
Matthew Wild <mwild1@gmail.com>
parents: 1042
diff changeset
1
1768
163967467308 mod_muc_limits: Update to work with both the new and the old MUC API
Kim Alvefur <zash@zash.se>
parents: 1428
diff changeset
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
diff changeset
3 local rooms = rawget(mod_muc, "rooms"); -- Old MUC API
554
a2b0174b5c48 mod_muc_limits: New module to impose overall rate-limits on a MUC (not on individual users)
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
4
1042
5fd0860c86cd mod_muc_limits: Allow stanzas from affiliated users even if they are not in the room
Matthew Wild <mwild1@gmail.com>
parents: 1040
diff changeset
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)
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
6 local st = require "util.stanza";
a2b0174b5c48 mod_muc_limits: New module to impose overall rate-limits on a MUC (not on individual users)
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
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
diff changeset
8 local t_insert, t_concat = table.insert, table.concat;
554
a2b0174b5c48 mod_muc_limits: New module to impose overall rate-limits on a MUC (not on individual users)
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
9
557
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";
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
11
554
a2b0174b5c48 mod_muc_limits: New module to impose overall rate-limits on a MUC (not on individual users)
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
12 local period = math.max(module:get_option_number("muc_event_rate", 0.5), 0);
a2b0174b5c48 mod_muc_limits: New module to impose overall rate-limits on a MUC (not on individual users)
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
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)
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
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
Kim Alvefur <zash@zash.se>
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
diff changeset
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
Kim Alvefur <zash@zash.se>
parents: 5567
diff changeset
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
Kim Alvefur <zash@zash.se>
parents: 5564
diff changeset
20
3965
2b10e51d85a6 mod_muc_limits: Add config option to limit to join stanzas only
Matthew Wild <mwild1@gmail.com>
parents: 3964
diff changeset
21 local join_only = module:get_option_boolean("muc_limit_joins_only", false);
1038
edb06824a5a4 mod_muc_limits: Condense multiple dropped stanzas into a single log message every 5 seconds
Matthew Wild <mwild1@gmail.com>
parents: 1036
diff changeset
22 local dropped_count = 0;
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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23 local dropped_jids;
edb06824a5a4 mod_muc_limits: Condense multiple dropped stanzas into a single log message every 5 seconds
Matthew Wild <mwild1@gmail.com>
parents: 1036
diff changeset
24
edb06824a5a4 mod_muc_limits: Condense multiple dropped stanzas into a single log message every 5 seconds
Matthew Wild <mwild1@gmail.com>
parents: 1036
diff changeset
25 local function log_dropped()
edb06824a5a4 mod_muc_limits: Condense multiple dropped stanzas into a single log message every 5 seconds
Matthew Wild <mwild1@gmail.com>
parents: 1036
diff changeset
26 module:log("warn", "Dropped %d stanzas from %d JIDs: %s", dropped_count, #dropped_jids, t_concat(dropped_jids, ", "));
edb06824a5a4 mod_muc_limits: Condense multiple dropped stanzas into a single log message every 5 seconds
Matthew Wild <mwild1@gmail.com>
parents: 1036
diff changeset
27 dropped_count = 0;
edb06824a5a4 mod_muc_limits: Condense multiple dropped stanzas into a single log message every 5 seconds
Matthew Wild <mwild1@gmail.com>
parents: 1036
diff changeset
28 dropped_jids = nil;
edb06824a5a4 mod_muc_limits: Condense multiple dropped stanzas into a single log message every 5 seconds
Matthew Wild <mwild1@gmail.com>
parents: 1036
diff changeset
29 end
1036
a44e755f7579 mod_muc_limits: Add muc_max_nick_length option, defaulting to 23 (bytes)
Matthew Wild <mwild1@gmail.com>
parents: 1035
diff changeset
30
554
a2b0174b5c48 mod_muc_limits: New module to impose overall rate-limits on a MUC (not on individual users)
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
31 local function handle_stanza(event)
a2b0174b5c48 mod_muc_limits: New module to impose overall rate-limits on a MUC (not on individual users)
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parents:
diff changeset
32 local origin, stanza = event.origin, event.stanza;
555
2356ad05fdb6 mod_muc_limits: Don't limit room leaving
Matthew Wild <mwild1@gmail.com>
parents: 554
diff changeset
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
Matthew Wild <mwild1@gmail.com>
parents: 554
diff changeset
34 return;
2356ad05fdb6 mod_muc_limits: Don't limit room leaving
Matthew Wild <mwild1@gmail.com>
parents: 554
diff changeset
35 end
1042
5fd0860c86cd mod_muc_limits: Allow stanzas from affiliated users even if they are not in the room
Matthew Wild <mwild1@gmail.com>
parents: 1040
diff changeset
36 local dest_room, dest_host, dest_nick = jid_split(stanza.attr.to);
3417
1534d0715d35 mod_muc_limits: Add support for new MUC API in Prosody 0.11
Kim Alvefur <zash@zash.se>
parents: 3402
diff changeset
37 local room = event.room or rooms[dest_room.."@"..dest_host];
554
a2b0174b5c48 mod_muc_limits: New module to impose overall rate-limits on a MUC (not on individual users)
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
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:
diff changeset
39 local from_jid = stanza.attr.from;
3418
9be9dd434813 mod_muc_limits: Simplify bypass for affiliated users
Kim Alvefur <zash@zash.se>
parents: 3417
diff changeset
40 if room:get_affiliation(jid_bare(from_jid)) then
554
a2b0174b5c48 mod_muc_limits: New module to impose overall rate-limits on a MUC (not on individual users)
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
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)
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
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
1036
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)
a44e755f7579 mod_muc_limits: Add muc_max_nick_length option, defaulting to 23 (bytes)
Matthew Wild <mwild1@gmail.com>
parents: 1035
diff changeset
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
diff changeset
46 :up():tag("x", { xmlns = xmlns_muc }));
a44e755f7579 mod_muc_limits: Add muc_max_nick_length option, defaulting to 23 (bytes)
Matthew Wild <mwild1@gmail.com>
parents: 1035
diff changeset
47 return true;
554
a2b0174b5c48 mod_muc_limits: New module to impose overall rate-limits on a MUC (not on individual users)
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
48 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:
diff changeset
49 local throttle = room.throttle;
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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50 if not room.throttle then
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Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
51 throttle = new_throttle(period*burst, burst);
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parents:
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52 room.throttle = throttle;
a2b0174b5c48 mod_muc_limits: New module to impose overall rate-limits on a MUC (not on individual users)
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
53 end
5608
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");
731ba9400c10 mod_muc_limits: Raise cost for multi-line messages
Kim Alvefur <zash@zash.se>
parents: 3965
diff changeset
56 if body then
731ba9400c10 mod_muc_limits: Raise cost for multi-line messages
Kim Alvefur <zash@zash.se>
parents: 3965
diff changeset
57 -- TODO calculate a text diagonal cross-section or some mathemagical
731ba9400c10 mod_muc_limits: Raise cost for multi-line messages
Kim Alvefur <zash@zash.se>
parents: 3965
diff changeset
58 -- number, maybe some cost multipliers
5567
d52cc18f0aa8 mod_muc_limits: Add a limit on number of bytes in a message body
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
Kim Alvefur <zash@zash.se>
parents: 5566
diff changeset
60 origin.send(st.error_reply(stanza, "modify", "policy-violation", "Your message is too long, please write a shorter one")
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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61 :up():tag("x", { xmlns = xmlns_muc }));
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parents: 5566
diff changeset
62 return true;
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Kim Alvefur <zash@zash.se>
parents: 5566
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63 end
5564
731ba9400c10 mod_muc_limits: Raise cost for multi-line messages
Kim Alvefur <zash@zash.se>
parents: 3965
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64 local body_lines = select(2, body:gsub("\n[^\n]*", ""));
5566
f71d66bd87be mod_muc_limits: Add a limit on number of lines per message
Kim Alvefur <zash@zash.se>
parents: 5564
diff changeset
65 if body_lines > max_line_count then
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parents: 5564
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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
diff changeset
67 :tag("x", { xmlns = xmlns_muc; }));
f71d66bd87be mod_muc_limits: Add a limit on number of lines per message
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parents: 5564
diff changeset
68 return true;
f71d66bd87be mod_muc_limits: Add a limit on number of lines per message
Kim Alvefur <zash@zash.se>
parents: 5564
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69 end
5608
6680a1f53353 mod_muc_limits: Reduce cost of multi-line messages, make configurable
Kim Alvefur <zash@zash.se>
parents: 5567
diff changeset
70 cost = cost + (body_lines * line_multiplier);
5564
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parents: 3965
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71 end
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Kim Alvefur <zash@zash.se>
parents: 3965
diff changeset
72 if not throttle:poll(cost) then
1038
edb06824a5a4 mod_muc_limits: Condense multiple dropped stanzas into a single log message every 5 seconds
Matthew Wild <mwild1@gmail.com>
parents: 1036
diff changeset
73 module:log("debug", "Dropping stanza for %s@%s from %s, over rate limit", dest_room, dest_host, from_jid);
edb06824a5a4 mod_muc_limits: Condense multiple dropped stanzas into a single log message every 5 seconds
Matthew Wild <mwild1@gmail.com>
parents: 1036
diff changeset
74 if not dropped_jids then
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Matthew Wild <mwild1@gmail.com>
parents: 1036
diff changeset
75 dropped_jids = { [from_jid] = true, from_jid };
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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76 module:add_timer(5, log_dropped);
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Matthew Wild <mwild1@gmail.com>
parents: 1036
diff changeset
77 elseif not dropped_jids[from_jid] then
edb06824a5a4 mod_muc_limits: Condense multiple dropped stanzas into a single log message every 5 seconds
Matthew Wild <mwild1@gmail.com>
parents: 1036
diff changeset
78 dropped_jids[from_jid] = true;
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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79 t_insert(dropped_jids, from_jid);
edb06824a5a4 mod_muc_limits: Condense multiple dropped stanzas into a single log message every 5 seconds
Matthew Wild <mwild1@gmail.com>
parents: 1036
diff changeset
80 end
edb06824a5a4 mod_muc_limits: Condense multiple dropped stanzas into a single log message every 5 seconds
Matthew Wild <mwild1@gmail.com>
parents: 1036
diff changeset
81 dropped_count = dropped_count + 1;
1205
7d2d440e2fa5 mod_muc_limits: Just drop error stanzas instead of bouncing them with more error stanzas
Kim Alvefur <zash@zash.se>
parents: 1058
diff changeset
82 if stanza.attr.type == "error" then -- We don't want to bounce errors
7d2d440e2fa5 mod_muc_limits: Just drop error stanzas instead of bouncing them with more error stanzas
Kim Alvefur <zash@zash.se>
parents: 1058
diff changeset
83 return true;
7d2d440e2fa5 mod_muc_limits: Just drop error stanzas instead of bouncing them with more error stanzas
Kim Alvefur <zash@zash.se>
parents: 1058
diff changeset
84 end
557
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
85 local reply = st.error_reply(stanza, "wait", "policy-violation", "The room is currently overactive, please try again later");
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
86 if body then
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
87 reply:up():tag("body"):text(body):up();
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parents: 556
diff changeset
88 end
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Matthew Wild <mwild1@gmail.com>
parents: 556
diff changeset
89 local x = stanza:get_child("x", xmlns_muc);
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
90 if x then
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
91 reply:add_child(st.clone(x));
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parents: 556
diff changeset
92 end
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Matthew Wild <mwild1@gmail.com>
parents: 556
diff changeset
93 origin.send(reply);
554
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parents:
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94 return true;
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Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
95 end
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Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
96 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:
diff changeset
97
3449
5e91a34b1e71 mod_muc_limits: Fix being unload on trunk
Kim Alvefur <zash@zash.se>
parents: 3418
diff changeset
98 if rooms then
5e91a34b1e71 mod_muc_limits: Fix being unload on trunk
Kim Alvefur <zash@zash.se>
parents: 3418
diff changeset
99 function module.unload()
3964
15355caf4553 mod_muc_limits: Add [luacheck] annotation to silence unused loop variable warning
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
5e91a34b1e71 mod_muc_limits: Fix being unload on trunk
Kim Alvefur <zash@zash.se>
parents: 3418
diff changeset
101 room.throttle = nil;
5e91a34b1e71 mod_muc_limits: Fix being unload on trunk
Kim Alvefur <zash@zash.se>
parents: 3418
diff changeset
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
diff changeset
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
diff changeset
104
3417
1534d0715d35 mod_muc_limits: Add support for new MUC API in Prosody 0.11
Kim Alvefur <zash@zash.se>
parents: 3402
diff changeset
105 module:hook("presence/full", handle_stanza, 501);
3965
2b10e51d85a6 mod_muc_limits: Add config option to limit to join stanzas only
Matthew Wild <mwild1@gmail.com>
parents: 3964
diff changeset
106 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
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
diff changeset
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
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