prosody-modules
cc30c4b5f006
mod_muc_moderation/mod_muc_moderation.lua

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mod_muc_moderation/mod_muc_moderation.lua @ 5930:cc30c4b5f006

mod_audit_auth: Allow suppressing repeated failure/success log entries from the same IP for a time This can be triggered by e.g. a distributed brute force attack, or from Monal.
author Matthew Wild <mwild1@gmail.com>
date Mon, 13 May 2024 18:30:18 +0100
parent 5619:2e30af180da5
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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diff changeset
1 -- mod_muc_moderation
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2 --
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3 -- Copyright (C) 2015-2021 Kim Alvefur
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4 --
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5 -- This file is MIT licensed.
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6 --
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7 -- Implements: XEP-0425: Message Moderation
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8 --
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9 -- Imports
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10 local dt = require "util.datetime";
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11 local id = require "util.id";
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12 local jid = require "util.jid";
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13 local st = require "util.stanza";
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14
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15 -- Plugin dependencies
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16 local mod_muc = module:depends "muc";
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17
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18 local muc_util = module:require "muc/util";
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19 local valid_roles = muc_util.valid_roles;
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20
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21 local muc_log_archive = module:open_store("muc_log", "archive");
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22
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23 if not muc_log_archive.set then
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24 module:log("warn", "Selected archive storage module does not support message replacement, no tombstones will be saved");
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25 end
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26
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27 -- Namespaces
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28 local xmlns_fasten = "urn:xmpp:fasten:0";
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29 local xmlns_moderate = "urn:xmpp:message-moderate:0";
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30 local xmlns_occupant_id = "urn:xmpp:occupant-id:0";
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31 local xmlns_retract = "urn:xmpp:message-retract:0";
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32
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33 -- Discovering support
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34 module:hook("muc-disco#info", function (event)
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35 event.reply:tag("feature", { var = xmlns_moderate }):up();
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36 end);
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37
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38 -- TODO error registry, requires Prosody 0.12+
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39
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40 -- moderate : function (string, string, string, boolean, string) : boolean, enum, enum, string
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41 local function moderate(actor, room_jid, stanza_id, retract, reason)
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42 local room_node = jid.split(room_jid);
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43 local room = mod_muc.get_room_from_jid(room_jid);
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44
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45 -- Permissions is based on role, which is a property of a current occupant,
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46 -- so check if the actor is an occupant, otherwise if they have a reserved
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47 -- nickname that can be used to retrieve the role.
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48 local actor_nick = room:get_occupant_jid(actor);
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49 if not actor_nick then
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50 local reserved_nickname = room:get_affiliation_data(jid.bare(actor), "reserved_nickname");
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51 if reserved_nickname then
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52 actor_nick = room.jid .. "/" .. reserved_nickname;
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53 end
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54 end
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55
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56 -- Retrieve their current role, iff they are in the room, otherwise what they
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57 -- would have based on affiliation.
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58 local affiliation = room:get_affiliation(actor);
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59 local role = room:get_role(actor_nick) or room:get_default_role(affiliation);
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60 if valid_roles[role or "none"] < valid_roles.moderator then
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61 return false, "auth", "forbidden", "You need a role of at least 'moderator'";
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62 end
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63
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64 -- Original stanza to base tombstone on
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65 local original, err;
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66 if muc_log_archive.get then
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67 original, err = muc_log_archive:get(room_node, stanza_id);
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68 else
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69 -- COMPAT missing :get API
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70 err = "item-not-found";
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71 for i, item in muc_log_archive:find(room_node, { key = stanza_id, limit = 1 }) do
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72 if i == stanza_id then
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73 original, err = item, nil;
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74 end
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75 end
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76 end
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77
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78 if not original then
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79 if err == "item-not-found" then
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80 return false, "modify", "item-not-found";
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81 else
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82 return false, "wait", "internal-server-error";
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83 end
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84 end
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85
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86
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87 local announcement = st.message({ from = room_jid, type = "groupchat", id = id.medium(), })
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88 :tag("apply-to", { xmlns = xmlns_fasten, id = stanza_id })
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89 :tag("moderated", { xmlns = xmlns_moderate, by = actor_nick })
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90
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91 if retract then
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92 announcement:tag("retract", { xmlns = xmlns_retract }):up();
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93 end
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94
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95 if reason then
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96 announcement:text_tag("reason", reason);
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97 end
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98
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99 local moderated_occupant_id = original:get_child("occupant-id", xmlns_occupant_id);
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100 if room.get_occupant_id and moderated_occupant_id then
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101 announcement:add_direct_child(moderated_occupant_id);
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102 end
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103
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104 local actor_occupant = room:get_occupant_by_real_jid(actor) or room:new_occupant(jid.bare(actor), actor_nick);
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105 if room.get_occupant_id then
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106 -- This isn't a regular broadcast message going through the events occupant_id.lib hooks so we do this here
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107 announcement:add_direct_child(st.stanza("occupant-id", { xmlns = xmlns_occupant_id; id = room:get_occupant_id(actor_occupant) }))
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108 end
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109
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110 if muc_log_archive.set and retract then
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111 local tombstone = st.message({ from = original.attr.from, type = "groupchat", id = original.attr.id })
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112 :tag("moderated", { xmlns = xmlns_moderate, by = actor_nick })
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113 :tag("retracted", { xmlns = xmlns_retract, stamp = dt.datetime() }):up();
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114
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115 if room.get_occupant_id then
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116 tombstone:add_direct_child(st.stanza("occupant-id", { xmlns = xmlns_occupant_id; id = room:get_occupant_id(actor_occupant) }))
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117
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118 if moderated_occupant_id then
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119 -- Copy occupant id from moderated message
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120 tombstone:add_child(moderated_occupant_id);
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parents: 5618
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121 end
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parents: 5170
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122 end
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parents: 5170
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123
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parents: 4806
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124 if reason then
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125 tombstone:text_tag("reason", reason);
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parents: 4806
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126 end
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127 tombstone:reset();
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128
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parents:
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129 local was_replaced = muc_log_archive:set(room_node, stanza_id, tombstone);
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parents:
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130 if not was_replaced then
5169
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parents: 4814
diff changeset
131 return false, "wait", "internal-server-error";
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parents:
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132 end
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parents:
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133 end
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parents:
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134
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parents:
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135 -- Done, tell people about it
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parents:
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136 module:log("info", "Message with id '%s' in room %s moderated by %s, reason: %s", stanza_id, room_jid, actor, reason);
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parents: 3901
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137 room:broadcast_message(announcement);
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parents:
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138
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parents: 4814
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139 return true;
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parents: 4814
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140 end
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parents: 4814
diff changeset
141
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parents: 4814
diff changeset
142 -- Main handling
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parents: 4814
diff changeset
143 module:hook("iq-set/bare/" .. xmlns_fasten .. ":apply-to", function (event)
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parents: 4814
diff changeset
144 local stanza, origin = event.stanza, event.origin;
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parents: 4814
diff changeset
145
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parents: 4814
diff changeset
146 local actor = stanza.attr.from;
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parents: 4814
diff changeset
147 local room_jid = stanza.attr.to;
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parents: 4814
diff changeset
148
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parents: 4814
diff changeset
149 -- Collect info we need
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parents: 4814
diff changeset
150 local apply_to = stanza.tags[1];
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parents: 4814
diff changeset
151 local moderate_tag = apply_to:get_child("moderate", xmlns_moderate);
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parents: 4814
diff changeset
152 if not moderate_tag then return end -- some other kind of fastening?
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parents: 4814
diff changeset
153
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parents: 4814
diff changeset
154 local reason = moderate_tag:get_child_text("reason");
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parents: 4814
diff changeset
155 local retract = moderate_tag:get_child("retract", xmlns_retract);
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parents: 4814
diff changeset
156
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parents: 4814
diff changeset
157 local stanza_id = apply_to.attr.id;
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Kim Alvefur <zash@zash.se>
parents: 4814
diff changeset
158
1071a420ff6f mod_muc_moderation: Refactor to prepare for new version of XEP-0425
Kim Alvefur <zash@zash.se>
parents: 4814
diff changeset
159 local ok, error_type, error_condition, error_text = moderate(actor, room_jid, stanza_id, retract, reason);
1071a420ff6f mod_muc_moderation: Refactor to prepare for new version of XEP-0425
Kim Alvefur <zash@zash.se>
parents: 4814
diff changeset
160 if not ok then
1071a420ff6f mod_muc_moderation: Refactor to prepare for new version of XEP-0425
Kim Alvefur <zash@zash.se>
parents: 4814
diff changeset
161 origin.send(st.error_reply(stanza, error_type, error_condition, error_text));
1071a420ff6f mod_muc_moderation: Refactor to prepare for new version of XEP-0425
Kim Alvefur <zash@zash.se>
parents: 4814
diff changeset
162 return true;
1071a420ff6f mod_muc_moderation: Refactor to prepare for new version of XEP-0425
Kim Alvefur <zash@zash.se>
parents: 4814
diff changeset
163 end
1071a420ff6f mod_muc_moderation: Refactor to prepare for new version of XEP-0425
Kim Alvefur <zash@zash.se>
parents: 4814
diff changeset
164
3897
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Kim Alvefur <zash@zash.se>
parents:
diff changeset
165 origin.send(st.reply(stanza));
3a96070f4a14 mod_muc_moderation: Initial commit of XEP-0425: Message Moderation
Kim Alvefur <zash@zash.se>
parents:
diff changeset
166 return true;
3a96070f4a14 mod_muc_moderation: Initial commit of XEP-0425: Message Moderation
Kim Alvefur <zash@zash.se>
parents:
diff changeset
167 end);
3a96070f4a14 mod_muc_moderation: Initial commit of XEP-0425: Message Moderation
Kim Alvefur <zash@zash.se>
parents:
diff changeset
168
3a96070f4a14 mod_muc_moderation: Initial commit of XEP-0425: Message Moderation
Kim Alvefur <zash@zash.se>
parents:
diff changeset
169 module:hook("muc-message-is-historic", function (event)
3a96070f4a14 mod_muc_moderation: Initial commit of XEP-0425: Message Moderation
Kim Alvefur <zash@zash.se>
parents:
diff changeset
170 -- Ensure moderation messages are stored
3a96070f4a14 mod_muc_moderation: Initial commit of XEP-0425: Message Moderation
Kim Alvefur <zash@zash.se>
parents:
diff changeset
171 if event.stanza.attr.from == event.room.jid then
3a96070f4a14 mod_muc_moderation: Initial commit of XEP-0425: Message Moderation
Kim Alvefur <zash@zash.se>
parents:
diff changeset
172 return event.stanza:get_child("apply-to", xmlns_fasten);
3a96070f4a14 mod_muc_moderation: Initial commit of XEP-0425: Message Moderation
Kim Alvefur <zash@zash.se>
parents:
diff changeset
173 end
3a96070f4a14 mod_muc_moderation: Initial commit of XEP-0425: Message Moderation
Kim Alvefur <zash@zash.se>
parents:
diff changeset
174 end, 1);