prosody-modules
3a96070f4a14
mod_muc_moderation/mod_muc_moderation.lua

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mod_muc_moderation/mod_muc_moderation.lua @ 3897:3a96070f4a14

mod_muc_moderation: Initial commit of XEP-0425: Message Moderation
author Kim Alvefur <zash@zash.se>
date Sat, 22 Feb 2020 21:11:31 +0100
child 3900:06971a04216f
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
3897
3a96070f4a14 mod_muc_moderation: Initial commit of XEP-0425: Message Moderation
Kim Alvefur <zash@zash.se>
parents:
diff changeset
1 -- Imports
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2 local dt = require "util.datetime";
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3 local id = require "util.id";
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4 local jid = require "util.jid";
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5 local st = require "util.stanza";
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6
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7 -- Plugin dependencies
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Kim Alvefur <zash@zash.se>
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8 local mod_muc = module:depends "muc";
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9
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10 local muc_util = module:require "muc/util";
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11 local valid_roles = muc_util.valid_roles;
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12
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13 local muc_log_archive = module:open_store("muc_log", "archive");
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14
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15 if not muc_log_archive.set then
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16 module:log("warn", "Selected archive storage module does not support message replacement, no tombstones will be saved");
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17 end
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18
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19 -- Namespaces
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20 local xmlns_fasten = "urn:xmpp:fasten:0";
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21 local xmlns_moderate = "urn:xmpp:message-moderate:0";
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22 local xmlns_retract = "urn:xmpp:message-retract:0";
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23
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24 -- Discovering support
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25 module:hook("muc-disco#info", function (event)
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26 event.reply:tag("feature", { var = xmlns_moderate }):up();
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27 end);
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28
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29 -- Main handling
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30 module:hook("iq-set/bare/" .. xmlns_fasten .. ":apply-to", function (event)
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31 local stanza, origin = event.stanza, event.origin;
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32
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33 -- Collect info we need
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34 local apply_to = stanza.tags[1];
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35 local moderate_tag = apply_to:get_child("moderate", xmlns_moderate);
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36 if not moderate_tag then return end -- some other kind of fastening?
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37
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38 local reason = moderate_tag:get_child_text("reason");
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39
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40 local room_jid = stanza.attr.to;
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41 local room_node = jid.split(room_jid);
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42 local room = mod_muc.get_room_from_jid(room_jid);
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43
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44 local stanza_id = apply_to.attr.id;
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45
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46 -- Permissions
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47 local actor = stanza.attr.from;
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48 local actor_nick = room:get_occupant_jid(actor);
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49 local affiliation = room:get_affiliation(actor);
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50 local role = room:get_role(actor_nick) or room:get_default_role(affiliation);
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51 if valid_roles[role or "none"] < valid_roles.moderator then
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52 origin.send(st.error_reply(stanza, "auth", "forbidden", "Insufficient privileges"));
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53 return true;
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54 end
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55
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56 -- Original stanza to base tombstone on
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57 local original, err;
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58 if muc_log_archive.get then
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59 original, err = muc_log_archive:get(room_node, stanza_id);
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60 else
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61 -- COMPAT missing :get API
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62 err = "item-not-found";
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63 for i, item in muc_log_archive:find(room_node, { key = stanza_id, limit = 1 }) do
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64 if i == stanza_id then
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65 original, err = item, nil;
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66 end
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67 end
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68 end
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69 if not original then
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70 if err == "item-not-found" then
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71 origin.send(st.error_reply(stanza, "modify", "item-not-found"));
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72 else
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73 origin.send(st.error_reply(stanza, "wait", "internal-server-error"));
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74 end
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75 return true;
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76 end
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77
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78 -- Replacements
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79 local tombstone = st.message({ from = original.attr.from, type = "groupchat", id = original.attr.id })
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80 :tag("moderated", { xmlns = xmlns_moderate, by = actor_nick })
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81 :tag("retracted", { xmlns = xmlns_retract, stamp = dt.datetime() }):up();
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82
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83 local announcement = st.message({ from = room_jid, type = "groupchat", id = id.medium(), })
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84 :tag("apply-to", { xmlns = xmlns_fasten, id = stanza_id })
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85 :tag("moderated", { xmlns = xmlns_moderate, by = actor_nick })
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86 :tag("retract", { xmlns = xmlns_retract }):up();
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87
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88 if reason then
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89 tombstone:text_tag("reason", reason);
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90 announcement:text_tag("reason", reason);
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91 end
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92
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93 if muc_log_archive.set then
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94 -- Tombstone
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95 local was_replaced = muc_log_archive:set(room_node, stanza_id, tombstone);
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96 if not was_replaced then
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97 origin.send(st.error_reply(stanza, "wait", "internal-server-error"));
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98 return true;
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99 end
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100 end
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101
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102 -- Done, tell people about it
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103 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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104 module:log("debug", ":broadcast(%s)", announcement);
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105 room:broadcast(announcement);
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106
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107 origin.send(st.reply(stanza));
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108 return true;
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109 end);
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110
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111 module:hook("muc-message-is-historic", function (event)
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112 -- Ensure moderation messages are stored
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113 if event.stanza.attr.from == event.room.jid then
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114 return event.stanza:get_child("apply-to", xmlns_fasten);
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115 end
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116 end, 1);