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annotate mod_muc_rai/mod_muc_rai.lua @ 3974:f14c862598a9

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mod_muc_rai: New module to implement Room Activity Indicators
author Matthew Wild <mwild1@gmail.com>
date Wed, 15 Apr 2020 21:19:45 +0100
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children 0e72dd70afff
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3974
f14c862598a9 mod_muc_rai: New module to implement Room Activity Indicators
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1 local cache = require "util.cache";
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2 local jid = require "util.jid";
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3 local st = require "util.stanza";
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4
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5 local max_subscribers = module:get_option_number("muc_rai_max_subscribers", 1024);
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6
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7 local muc_affiliation_store = module:open_store("config", "map");
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8 local muc_archive = module:open_store("muc_log", "archive");
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9
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10 local xmlns_rai = "xmpp:prosody.im/protocol/rai";
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11
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12 local muc_markers = module:depends("muc_markers");
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13
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14 -- subscriber_jid -> { [room_jid] = interested }
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15 local subscribed_users = cache.new(max_subscribers, false);
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16 -- room_jid -> { [user_jid] = interested }
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17 local interested_users = {};
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18 -- room_jid -> last_id
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19 local room_activity_cache = cache.new(1024);
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20
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21 -- Send a single notification for a room, updating data structures as needed
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22 local function send_single_notification(user_jid, room_jid)
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23 local notification = st.message({ to = user_jid, from = module.host })
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24 :tag("rai", { xmlns = xmlns_rai })
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25 :text_tag("activity", room_jid)
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26 :up();
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27 local interested_room_users = interested_users[room_jid];
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28 if interested_room_users then
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29 interested_room_users[user_jid] = nil;
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30 end
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31 local interested_rooms = subscribed_users:get(user_jid);
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32 if interested_rooms then
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33 interested_rooms[room_jid] = nil;
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34 end
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35 module:log("debug", "Sending notification from %s to %s", room_jid, user_jid);
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36 return module:send(notification);
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37 end
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38
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39 local function subscribe_room(user_jid, room_jid)
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40 local interested_rooms = subscribed_users:get(user_jid);
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41 if not interested_rooms then
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42 return nil, "not-subscribed";
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43 end
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44 module:log("debug", "Subscribed %s to %s", user_jid, room_jid);
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45 interested_rooms[room_jid] = true;
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46
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47 local interested_room_users = interested_users[room_jid];
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48 if not interested_room_users then
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49 interested_room_users = {};
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50 interested_users[room_jid] = interested_room_users;
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51 end
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52 interested_room_users[user_jid] = true;
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53 return true;
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54 end
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55
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56 local function unsubscribe_room(user_jid, room_jid)
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57 local interested_rooms = subscribed_users:get(user_jid);
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58 if not interested_rooms then
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59 return nil, "not-subscribed";
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60 end
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61 interested_rooms[room_jid] = nil;
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62
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63 local interested_room_users = interested_users[room_jid];
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64 if not interested_room_users then
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65 return true;
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66 end
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67 interested_room_users[user_jid] = nil;
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68 return true;
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69 end
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70
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71 local function notify_interested_users(room_jid)
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72 module:log("warn", "NOTIFYING FOR %s", room_jid)
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73 local interested_room_users = interested_users[room_jid];
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74 if not interested_room_users then
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75 module:log("debug", "Nobody interested in %s", room_jid);
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76 return;
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77 end
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78 for user_jid in pairs(interested_room_users) do
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79 send_single_notification(user_jid, room_jid);
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80 end
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81 return true;
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82 end
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83
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84 local function unsubscribe_user_from_all_rooms(user_jid)
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85 local interested_rooms = subscribed_users:get(user_jid);
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86 if not interested_rooms then
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87 return nil, "not-subscribed";
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88 end
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89 for room_jid in pairs(interested_rooms) do
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90 unsubscribe_room(user_jid, room_jid);
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91 end
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92 return true;
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93 end
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94
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95 local function get_last_room_message_id(room_jid)
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96 local last_room_message_id = room_activity_cache:get(room_jid);
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97 if last_room_message_id then
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98 return last_room_message_id;
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99 end
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100
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101 -- Load all the data!
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102 local query = {
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103 limit = 1;
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104 reverse = true;
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105 with = "message<groupchat";
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106 }
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107 local data, err = muc_archive:find(jid.node(room_jid), query);
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108
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109 if not data then
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110 module:log("error", "Could not fetch history: %s", err);
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111 return nil;
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112 end
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113
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114 local id = data();
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115 room_activity_cache:set(room_jid, id);
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116 return id;
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117 end
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118
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119 local function update_room_activity(room_jid, last_id)
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120 room_activity_cache:set(room_jid, last_id);
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121 end
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122
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123 local function get_last_user_read_id(user_jid, room_jid)
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124 return muc_markers.get_user_read_marker(user_jid, room_jid);
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125 end
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126
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127 local function has_new_activity(room_jid, user_jid)
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128 local last_room_message_id = get_last_room_message_id(room_jid);
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129 local last_user_read_id = get_last_user_read_id(user_jid, room_jid);
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130 return last_room_message_id ~= last_user_read_id;
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131 end
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132
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133 -- Returns a set of rooms that a user is interested in
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134 local function get_interested_rooms(user_jid)
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135 -- Use affiliation as an indication of interest, return
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136 -- all rooms a user is affiliated
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137 return muc_affiliation_store:get_all(jid.bare(user_jid));
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138 end
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139
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140 -- Subscribes to all rooms that the user has an interest in
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141 -- Returns a set of room JIDs that have already had activity (thus no subscription)
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142 local function subscribe_all_rooms(user_jid)
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143 -- Send activity notifications for all relevant rooms
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144 local interested_rooms, err = get_interested_rooms(user_jid);
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145
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146 if not interested_rooms then
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147 if err then
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148 return nil, "internal-server-error";
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149 end
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150 interested_rooms = {};
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151 end
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152
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153 if not subscribed_users:set(user_jid, interested_rooms) then
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154 module:log("warn", "Subscriber limit (%d) reached, rejecting subscription from %s", max_subscribers, user_jid);
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155 return nil, "resource-constraint";
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156 end
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157
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158 local rooms_with_activity;
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159 for room_name in pairs(interested_rooms) do
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160 local room_jid = room_name.."@"..module.host;
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161 if has_new_activity(room_jid, user_jid) then
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162 -- There has already been activity, include this room
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163 -- in the response
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164 if not rooms_with_activity then
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165 rooms_with_activity = {};
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166 end
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167 rooms_with_activity[room_jid] = true;
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168 else
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169 -- Subscribe to any future activity
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170 subscribe_room(user_jid, room_jid);
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171 end
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172 end
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173 return rooms_with_activity;
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174 end
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175
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176 module:hook("presence/host", function (event)
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177 local origin, stanza = event.origin, event.stanza;
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178 local user_jid = stanza.attr.from;
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179
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180 if stanza.attr.type == "unavailable" then -- User going offline
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181 unsubscribe_user_from_all_rooms(user_jid);
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182 return true;
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183 end
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184
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185 local rooms_with_activity, err = subscribe_all_rooms(user_jid);
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186
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187 if not rooms_with_activity then
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188 if not err then
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189 module:log("debug", "No activity to notify");
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190 return true;
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191 else
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192 return origin.send(st.error_reply(stanza, "wait", "resource-constraint"));
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193 end
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194 end
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195
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196 local reply = st.reply(stanza)
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197 :tag("rai", { xmlns = xmlns_rai });
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198 for room_jid in pairs(rooms_with_activity) do
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199 reply:text_tag("activity", room_jid);
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200 end
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201 return origin.send(reply);
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202 end);
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203
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204 module:hook("muc-broadcast-message", function (event)
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205 local room, stanza = event.room, event.stanza;
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206 local archive_id = stanza:get_child_text("stanza-id", "urn:xmpp:sid:0");
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207 if archive_id then
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208 -- Remember the id of the last message so we can compare it
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209 -- to the per-user marker (managed by mod_muc_markers)
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210 update_room_activity(room.jid, archive_id);
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211 -- Notify any users that need to be notified
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212 notify_interested_users(room.jid);
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213 end
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214 end, -1);
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215