prosody-modules
259ffdbf8906
mod_anti_spam/rtbl.lib.lua

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mod_anti_spam/rtbl.lib.lua @ 5883:259ffdbf8906

mod_anti_spam: New module for spam filtering (pre-alpha)
author Matthew Wild <mwild1@gmail.com>
date Tue, 05 Mar 2024 18:26:29 +0000
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1 local array = require "util.array";
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2 local id = require "util.id";
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3 local it = require "util.iterators";
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4 local set = require "util.set";
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5 local st = require "util.stanza";
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6
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7 module:depends("pubsub_subscription");
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8
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9 local function new_rtbl_subscription(rtbl_service_jid, rtbl_node, handlers)
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10 local items = {};
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11
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12 local function notify(event_type, hash)
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13 local handler = handlers[event_type];
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14 if not handler then return; end
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15 handler(hash);
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16 end
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17
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18 module:add_item("pubsub-subscription", {
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19 service = rtbl_service_jid;
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20 node = rtbl_node;
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21
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22 -- Callbacks:
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23 on_subscribed = function()
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24 module:log("info", "RTBL active: %s:%s", rtbl_service_jid, rtbl_node);
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25 end;
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26
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27 on_error = function(err)
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28 module:log(
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29 "error",
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30 "Failed to subscribe to RTBL: %s:%s %s::%s: %s",
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31 rtbl_service_jid,
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32 rtbl_node,
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33 err.type,
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34 err.condition,
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35 err.text
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36 );
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37 end;
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38
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39 on_item = function(event)
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40 local hash = event.item.attr.id;
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41 if not hash then return; end
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42 module:log("debug", "Received new hash from %s:%s: %s", rtbl_service_jid, rtbl_node, hash);
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43 items[hash] = true;
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44 notify("added", hash);
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45 end;
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46
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47 on_retract = function (event)
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48 local hash = event.item.attr.id;
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49 if not hash then return; end
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50 module:log("debug", "Retracted hash from %s:%s: %s", rtbl_service_jid, rtbl_node, hash);
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51 items[hash] = nil;
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52 notify("removed", hash);
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53 end;
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54
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55 purge = function()
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56 module:log("debug", "Purge all hashes from %s:%s", rtbl_service_jid, rtbl_node);
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57 for hash in pairs(items) do
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58 items[hash] = nil;
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59 notify("removed", hash);
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60 end
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61 end;
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62 });
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63
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64 local request_id = "rtbl-request-"..id.short();
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65
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66 local function request_list()
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67 local items_request = st.iq({ to = rtbl_service_jid, from = module.host, type = "get", id = request_id })
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68 :tag("pubsub", { xmlns = "http://jabber.org/protocol/pubsub" })
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69 :tag("items", { node = rtbl_node }):up()
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70 :up();
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71 module:send(items_request);
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72 end
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73
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74 local function update_list(event)
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75 local from_jid = event.stanza.attr.from;
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76 if from_jid ~= rtbl_service_jid then
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77 module:log("debug", "Ignoring RTBL response from unknown sender: %s", from_jid);
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78 return;
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79 end
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80 local items_el = event.stanza:find("{http://jabber.org/protocol/pubsub}pubsub/items");
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81 if not items_el then
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82 module:log("warn", "Invalid items response from RTBL service %s:%s", rtbl_service_jid, rtbl_node);
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83 return;
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84 end
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85
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86 local old_entries = set.new(array.collect(it.keys(items)));
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87
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88 local n_added, n_removed, n_total = 0, 0, 0;
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89 for item in items_el:childtags("item") do
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90 local hash = item.attr.id;
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91 if hash then
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92 n_total = n_total + 1;
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93 if not old_entries:contains(hash) then
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94 -- New entry
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95 n_added = n_added + 1;
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96 items[hash] = true;
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97 notify("added", hash);
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98 else
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99 -- Entry already existed
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100 old_entries:remove(hash);
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101 end
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102 end
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103 end
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104
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105 -- Remove old entries that weren't in the received list
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106 for hash in old_entries do
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107 n_removed = n_removed + 1;
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108 items[hash] = nil;
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109 notify("removed", hash);
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110 end
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111
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112 module:log("info", "%d RTBL entries received from %s:%s (%d added, %d removed)", n_total, from_jid, rtbl_node, n_added, n_removed);
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113 return true;
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114 end
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115
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116 module:hook("iq-result/host/"..request_id, update_list);
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117 module:add_timer(0, request_list);
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118 end
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119
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120 return {
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121 new_rtbl_subscription = new_rtbl_subscription;
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122 }