Mercurial > prosody-modules

annotate mod_muc_moderation/mod_muc_moderation.lua @ 4568:88089c61121d

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mod_muc_bot: Add a README
author Kim Alvefur <zash@zash.se>
date Mon, 24 May 2021 16:35:47 +0200
parents a38e6a8a781a
children 3a7953a5ee5b
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1 -- mod_muc_moderation
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2 --
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3 -- Copyright (C) 2015-2020 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_retract = "urn:xmpp:message-retract:0";
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31
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32 -- Discovering support
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33 module:hook("muc-disco#info", function (event)
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34 event.reply:tag("feature", { var = xmlns_moderate }):up();
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35 end);
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36
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37 -- Main handling
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38 module:hook("iq-set/bare/" .. xmlns_fasten .. ":apply-to", function (event)
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39 local stanza, origin = event.stanza, event.origin;
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40
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41 -- Collect info we need
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42 local apply_to = stanza.tags[1];
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43 local moderate_tag = apply_to:get_child("moderate", xmlns_moderate);
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44 if not moderate_tag then return end -- some other kind of fastening?
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45
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46 local reason = moderate_tag:get_child_text("reason");
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47
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48 local room_jid = stanza.attr.to;
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49 local room_node = jid.split(room_jid);
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50 local room = mod_muc.get_room_from_jid(room_jid);
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51
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52 local stanza_id = apply_to.attr.id;
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53
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54 -- Permissions
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55 local actor = stanza.attr.from;
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56 local actor_nick = room:get_occupant_jid(actor);
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57 local affiliation = room:get_affiliation(actor);
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58 local role = room:get_role(actor_nick) or room:get_default_role(affiliation);
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59 if valid_roles[role or "none"] < valid_roles.moderator then
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60 origin.send(st.error_reply(stanza, "auth", "forbidden", "You need a role of at least 'moderator'"));
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61 return true;
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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 if not original then
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78 if err == "item-not-found" then
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79 origin.send(st.error_reply(stanza, "modify", "item-not-found"));
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80 else
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81 origin.send(st.error_reply(stanza, "wait", "internal-server-error"));
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82 end
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83 return true;
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84 end
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85
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86 -- Replacements
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87 local tombstone = st.message({ from = original.attr.from, type = "groupchat", id = original.attr.id })
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88 :tag("moderated", { xmlns = xmlns_moderate, by = actor_nick })
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89 :tag("retracted", { xmlns = xmlns_retract, stamp = dt.datetime() }):up();
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90
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91 local announcement = st.message({ from = room_jid, type = "groupchat", id = id.medium(), })
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92 :tag("apply-to", { xmlns = xmlns_fasten, id = stanza_id })
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93 :tag("moderated", { xmlns = xmlns_moderate, by = actor_nick })
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94 :tag("retract", { xmlns = xmlns_retract }):up();
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95
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96 if reason then
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97 tombstone:text_tag("reason", reason);
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98 announcement:text_tag("reason", reason);
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99 end
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100
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101 if muc_log_archive.set then
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102 -- Tombstone
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103 local was_replaced = muc_log_archive:set(room_node, stanza_id, tombstone);
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104 if not was_replaced then
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105 origin.send(st.error_reply(stanza, "wait", "internal-server-error"));
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106 return true;
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107 end
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108 end
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109
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110 -- Done, tell people about it
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111 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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112 room:broadcast_message(announcement);
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113
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114 origin.send(st.reply(stanza));
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115 return true;
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116 end);
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117
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118 module:hook("muc-message-is-historic", function (event)
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119 -- Ensure moderation messages are stored
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120 if event.stanza.attr.from == event.room.jid then
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121 return event.stanza:get_child("apply-to", xmlns_fasten);
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122 end
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123 end, 1);