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annotate mod_muc_rtbl/mod_muc_rtbl.lua @ 5169:1071a420ff6f

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mod_muc_moderation: Refactor to prepare for new version of XEP-0425 Plan is to add support for both versions concurrently for a transition period while clients upgrade.
author Kim Alvefur <zash@zash.se>
date Sun, 19 Feb 2023 17:51:45 +0100
parents 0a257d1402c3
children 460f78654864
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1 local array = require "util.array";
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2 local it = require "util.iterators";
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3 local jid = require "util.jid";
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4 local sha256 = require "util.hashes".sha256;
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5 local set = require "util.set";
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6 local st = require "util.stanza";
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7
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8 local rtbl_service_jid = assert(module:get_option_string("muc_rtbl_jid"), "No RTBL JID supplied");
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9 local rtbl_node = module:get_option_string("muc_rtbl_node", "muc_bans_sha256");
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10
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11 local banned_hashes = module:shared("banned_hashes");
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12
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13 module:depends("pubsub_subscription");
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14
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15 module:add_item("pubsub-subscription", {
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16 service = rtbl_service_jid;
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17 node = rtbl_node;
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18
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19 -- Callbacks:
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20 on_subscribed = function()
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21 module:log("info", "RTBL active");
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22 end;
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23
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24 on_error = function(err)
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25 module:log("error", "Failed to subscribe to RTBL: %s::%s: %s", err.type, err.condition, err.text);
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26 end;
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27
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28 on_item = function(event)
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29 local hash = event.item.attr.id;
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30 if not hash then return; end
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31 module:log("debug", "Received new hash: %s", hash);
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32 banned_hashes[hash] = true;
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33 end;
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34
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35 on_retract = function (event)
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36 local hash = event.item.attr.id;
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37 if not hash then return; end
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38 module:log("debug", "Retracted hash: %s", hash);
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39 banned_hashes[hash] = nil;
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40 end;
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41 });
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42
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43 function request_list()
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44 local items_request = st.iq({ to = rtbl_service_jid, from = module.host, type = "get", id = "rtbl-request" })
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45 :tag("pubsub", { xmlns = "http://jabber.org/protocol/pubsub" })
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46 :tag("items", { node = rtbl_node }):up()
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47 :up();
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48
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49 module:send(items_request);
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50 end
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51
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52 function update_list(event)
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53 local from_jid = event.stanza.attr.from;
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54 if from_jid ~= rtbl_service_jid then
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55 module:log("debug", "Ignoring RTBL response from unknown sender");
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56 return;
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57 end
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58 local items_el = event.stanza:find("{http://jabber.org/protocol/pubsub}pubsub/items");
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59 if not items_el then
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60 module:log("warn", "Invalid items response from RTBL service");
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61 return;
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62 end
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63
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64 local old_entries = set.new(array.collect(it.keys(banned_hashes)));
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65
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66 local n_added, n_removed, n_total = 0, 0, 0;
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67 for item in items_el:childtags("item") do
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68 local hash = item.attr.id;
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69 if hash then
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70 n_total = n_total + 1;
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71 if not old_entries:contains(hash) then
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72 -- New entry
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73 n_added = n_added + 1;
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74 banned_hashes[hash] = true;
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75 else
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76 -- Entry already existed
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77 old_entries:remove(hash);
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78 end
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79 end
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80 end
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81
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82 -- Remove old entries that weren't in the received list
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83 for hash in old_entries do
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84 n_removed = n_removed + 1;
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85 banned_hashes[hash] = nil;
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86 end
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87
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88 module:log("info", "%d RTBL entries received from %s (%d added, %d removed)", n_total, from_jid, n_added, n_removed);
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89 return true;
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90 end
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91
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92 module:hook("iq-result/host/rtbl-request", update_list);
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93
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94 module:hook("muc-occupant-pre-join", function (event)
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95 if next(banned_hashes) == nil then return end
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96
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97 local from_bare = jid.bare(event.stanza.attr.from);
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98
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99 local affiliation = event.room:get_affiliation(from_bare);
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100 if affiliation and affiliation ~= "none" then
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101 -- Skip check for affiliated users
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102 return;
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103 end
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104
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105 local bare_hash = sha256(jid.bare(event.stanza.attr.from), true);
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106 local host_hash = sha256(jid.host(event.stanza.attr.from), true);
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107 if banned_hashes[bare_hash] or banned_hashes[host_hash] then
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108 module:log("info", "Blocked user <%s> from room <%s> due to RTBL match", from_bare, event.stanza.attr.to);
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109 local error_reply = st.error_reply(event.stanza, "cancel", "forbidden", "You are banned from this service", event.room.jid);
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110 event.origin.send(error_reply);
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111 return true;
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112 end
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113 end);
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114
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115 if prosody.start_time then
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116 request_list();
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117 else
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118 module:hook_global("server-started", function ()
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119 request_list();
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120 end);
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121 end