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annotate mod_reminders/mod_reminders.lua @ 5298:12f7d8b901e0

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mod_audit: Support for adding location (GeoIP) to audit events This can be more privacy-friendly than logging full IP addresses, and also more informative to a user - IP addresses don't mean much to the average person, however if they see activity from outside their expected country, they can immediately identify suspicious activity. As with IPs, this field is configurable for deployments that would like to disable it. Location is also not logged when the geoip library is not available.
author Matthew Wild <mwild1@gmail.com>
date Sat, 01 Apr 2023 13:11:53 +0100
parents 9eabd68b8e48
children
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1 -- mod_reminders
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2 --
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3 -- Copyright (C) 2020 Marcos de Vera Piquero <marcos@tenak.net>
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4 --
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5 -- This file is MIT/X11 licensed.
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6 --
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7 -- A module to support ProtoXEP: Reminders
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8 --
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9
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10 local id = require "util.id"
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11 local datetime = require"util.datetime";
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12 local errors = require"util.error";
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13 local jid = require"util.jid";
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14 local st = require"util.stanza";
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15 local os_time = os.time;
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16
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17 local xmlns_reminders = "urn:xmpp:reminders:0";
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18
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19 local reminders_store = module:open_store(xmlns_reminders, "keyval");
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20
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21 local reminders_errors = {
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22 missing_fields = {
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23 type = "modify";
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24 condition = "bad-request";
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25 text = "Missing required value for date or text";
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26 };
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27 invalid_dateformat = {
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28 type = "modify";
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29 condition = "bad-request";
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30 text = "Invalid date format";
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31 };
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32 past_date = {
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33 type = "modify";
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34 condition = "gone";
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35 text = "Reminder date is in the past";
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36 };
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37 store_error = {
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38 type = "cancel";
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39 condition = "internal-server-error";
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40 text = "Unable to persist data";
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41 };
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42 };
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43
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44 local function reminder_error (name)
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45 return errors.new(name, nil, reminders_errors);
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46 end
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47
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48 local function store_reminder (reminder)
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49 -- pushes the reminder to the store, and nothing else
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50 return reminders_store:set(reminder.id, reminder);
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51 end
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52
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53 local function delete_reminder (reminder_id)
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54 -- empties the store for the given reminder_id
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55 return reminders_store:set(reminder_id, nil);
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56 end
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57
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58 local function get_reminder (reminder_id)
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59 return reminders_store:get(reminder_id);
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60 end
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61
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62 local function send_reminder (reminder)
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63 -- actually delivers the <message /> with the reminder to the user
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64 local bare = jid.bare(reminder.jid);
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65 module:log("debug", "Sending reminder %s to %s", reminder.id, bare);
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66 local message = st.message({ from = "localhost"; to = bare; id = id.short() })
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67 :tag("reminder", {id = reminder.id; xmlns = xmlns_reminders})
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68 :add_child(reminder.text)
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69 :tag("date"):text(datetime.datetime(reminder.date)):up();
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70 module:send(message);
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71 return delete_reminder(reminder.id)
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72 end
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73
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74 local function schedule_reminder (reminder)
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75 -- schedule a module:add_timer for the given reminder
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76 module:log("debug", "Scheduling reminder to datetime %s", reminder.date);
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77 local now = os_time();
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78 local when = reminder.date;
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79 local delay = when - now;
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80 module:log("debug", "Reminder text: %s", reminder.text);
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81 local function callback ()
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82 send_reminder(reminder)
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83 end
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84 module:add_timer(delay, callback);
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85 end
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86
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87 local function process_reminders_store ()
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88 -- retrieve all reminders in the store and schedule them
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89 for reminder_id in reminders_store:users() do
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90 module:log("debug", "Found stored reminder %s", reminder_id);
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91 local reminder = get_reminder(reminder_id);
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92 if reminder.date and reminder.text then
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93 local text = st.deserialize(reminder.text)
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94 module:log("debug", "Read reminder %s", reminder.id);
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95 -- cleanup missed reminders
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96 if reminder.date < os_time() then
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97 module:log("debug", "Deleting outdated reminder %s", reminder.id)
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98 delete_reminder(reminder.id)
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99 end
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100 schedule_reminder({
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101 date = reminder.date;
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102 id = reminder.id;
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103 jid = reminder.jid;
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104 text = text;
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105 })
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106 else
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107 delete_reminder(reminder_id);
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108 end
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109 end
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110 end
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111
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112 local function create_reminder (jid, reminder)
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113 local date = reminder:get_child("date");
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114 local text = reminder:get_child("text");
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115 if date == nil or text == nil then
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116 return nil, reminder_error("missing_fields")
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117 end
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118 local now = os_time();
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119 local _, parsed_date = pcall(datetime.parse, date:get_text());
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120 if parsed_date == nil then
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121 return nil, reminder_error("invalid_dateformat")
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122 end
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123 if parsed_date < now then
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124 return nil, reminder_error("past_date"), nil
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125 end
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126 local reminder_id = id.medium();
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127 local rem = st.stanza("reminder", {xmlns = xmlns_reminders; id = reminder_id});
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128 local data = {
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129 id = reminder_id;
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130 jid = jid;
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131 text = text;
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132 date = parsed_date;
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133 }
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134 local stored = store_reminder(data);
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135 if not stored then
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136 return nil, reminder_error("store_error")
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137 end
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138 schedule_reminder(data);
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139 return rem
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140 end
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141
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142 local function handle_set (event)
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143 local origin, stanza = event.origin, event.stanza
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144 local reminder = stanza:get_child("reminder", xmlns_reminders);
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145 if reminder.attr.id ~= nil and reminder:get_child("date") == nil then
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146 -- delete existing reminder
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147 local ok = delete_reminder(reminder.attr.id);
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148 if ok then
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149 module:log("debug", "reminder %s deleted", reminder.attr.id);
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150 origin.send(st.reply(stanza):add_child(reminder));
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151 else
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152 module:log("debug", "failed to delete reminder %s", reminder.attr.id);
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153 origin.send(st.error_reply(stanza, "cancel", "internal-server-error"));
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154 end
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155 return true;
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156 else
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157 -- create new reminder
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158 local jid = stanza.attr.from
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159 local created, err = create_reminder(jid, reminder);
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160 if err ~= nil then
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161 origin.send(st.error_reply(stanza, err))
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162 return true;
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163 else
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164 origin.send(st.reply(stanza):add_child(created))
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165 return true;
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166 end
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167 end
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168 origin.send(st.error_reply(stanza, "modify", "bad-request"));
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169 return true;
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170 end
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171
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172
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173 -- load saved reminders and set timers
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174 process_reminders_store();
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175
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176 module:hook("iq-set/host/"..xmlns_reminders..":reminder", handle_set)
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177 module:add_feature(xmlns_reminders);
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178 module:log("debug", "Module loaded");