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annotate mod_reminders/mod_reminders.lua @ 4703:94df7986a874

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mod_tlsfail: Add README
author Kim Alvefur <zash@zash.se>
date Sun, 03 Oct 2021 17:12:32 +0200
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");