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annotate mod_muc_rtbl/mod_muc_rtbl.lua @ 5175:432587ad1642

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mod_muc_rtbl: fix traceback because of scoping error There is no "event" there, we have to use the occupant data instead. That's what you get for moving code around!
author Jonas Schäfer <jonas@wielicki.name>
date Wed, 22 Feb 2023 13:33:16 +0100
parents 354832098f2f
children 4791e0412ff3
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rev   line source
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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 function update_hashes(occupant)
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95 local bare_hash, host_hash;
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96 if not occupant.mod_muc_rtbl_bare_hash then
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97 bare_hash = sha256(jid.bare(occupant.bare_jid), true);
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98 occupant.mod_muc_rtbl_bare_hash = bare_hash;
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99 else
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100 bare_hash = occupant.mod_muc_rtbl_bare_hash;
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101 end
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102 if not occupant.mod_muc_rtbl_host_hash then
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103 host_hash = sha256(jid.host(occupant.bare_jid), true);
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104 event.occupant.mod_muc_rtbl_host_hash = host_hash;
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105 else
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106 host_hash = event.occupant.mod_muc_rtbl_host_hash;
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107 end
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108 return bare_hash, host_hash
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109 end
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110
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111 module:hook("muc-occupant-pre-join", function (event)
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112 if next(banned_hashes) == nil then return end
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113
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114 local from_bare = jid.bare(event.stanza.attr.from);
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115
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116 local affiliation = event.room:get_affiliation(from_bare);
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117 if affiliation and affiliation ~= "none" then
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118 -- Skip check for affiliated users
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119 return;
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120 end
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121
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122 local bare_hash, host_hash = update_hashes(event.occupant);
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123 if banned_hashes[bare_hash] or banned_hashes[host_hash] then
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124 module:log("info", "Blocked user <%s> from room <%s> due to RTBL match", from_bare, event.stanza.attr.to);
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125 local error_reply = st.error_reply(event.stanza, "cancel", "forbidden", "You are banned from this service", event.room.jid);
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126 event.origin.send(error_reply);
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127 return true;
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128 end
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129 end);
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130
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131 module:hook("muc-occupant-groupchat", function(event)
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132 local bare_hash, host_hash = update_hashes(event.occupant);
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133 if banned_hashes[bare_hash] or banned_hashes[host_hash] then
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134 module:log("debug", "Blocked message from user <%s> to room <%s> due to RTBL match", event.stanza.attr.from, event.stanza.attr.to);
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135 local error_reply = st.error_reply(event.stanza, "cancel", "forbidden", "You are banned from this service", event.room.jid);
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136 event.origin.send(error_reply);
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137 return true;
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138 end
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139 end);
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140
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141 module:hook("muc-private-message", function(event)
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142 local occupant = event.room:get_occupant_by_nick(event.stanza.attr.from);
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143 local bare_hash, host_hash = update_hashes(occupant);
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144 if banned_hashes[bare_hash] or banned_hashes[host_hash] then
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145 module:log("debug", "Blocked private message from user <%s> from room <%s> due to RTBL match", occupant.bare_jid, event.stanza.attr.to);
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146 local error_reply = st.error_reply(event.stanza, "cancel", "forbidden", "You are banned from this service", event.room.jid);
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147 event.origin.send(error_reply);
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148 return true;
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149 end
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150 end);
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151
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152 if prosody.start_time then
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153 request_list();
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154 else
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155 module:hook_global("server-started", function ()
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156 request_list();
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157 end);
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158 end