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annotate mod_muc_offline_delivery/mod_muc_offline_delivery.lua @ 4651:8231774f5bfd

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mod_cloud_notify_encrypted: Ensure body substring remains valid UTF-8 The `body:sub()` call risks splitting the string in the middle of a multi-byte UTF-8 sequence. This should have been caught by util.stanza validation, but that would have caused some havoc, at the very least causing the notification to not be sent. There have been no reports of this happening. Likely because this module isn't widely deployed among users with languages that use many longer UTF-8 sequences. The util.encodings.utf8.valid() function is O(n) where only the last sequence really needs to be checked, but it's in C and expected to be fast.
author Kim Alvefur <zash@zash.se>
date Sun, 22 Aug 2021 13:22:59 +0200
parents 3b7847c9bd26
children 8bd36bba2292
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1 local st = require "util.stanza";
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2
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3 module:add_item("muc-registration-field", {
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4 name = "{http://tigase.org/protocol/muc}offline";
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5 type = "boolean";
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6 label = "Receive messages while not connected to the room";
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7 value = false;
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8 });
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9
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10 module:hook("muc-registration-submitted", function (event)
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11 local deliver_offline = event.submitted_data["{http://tigase.org/protocol/muc}offline"] or nil;
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12 event.affiliation_data.offline_delivery = deliver_offline;
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13 end);
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14
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15 module:hook("muc-add-history", function (event)
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16 module:log("debug", "Broadcasting message to offline occupants...");
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17 local sent = 0;
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18 local room = event.room;
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19 for jid, affiliation, data in room:each_affiliation() do --luacheck: ignore 213/affiliation
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20 local reserved_nickname = data and data.reserved_nickname;
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21 module:log("debug", "Affiliated: %s, %s: %s", jid, reserved_nickname, data and data.offline_delivery);
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22 if reserved_nickname and data.offline_delivery then
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23 local is_absent = not room:get_occupant_by_nick(room.jid.."/"..reserved_nickname);
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24 if is_absent then
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25 local msg = st.clone(event.stanza);
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26 msg.attr.to = jid;
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27 module:send(msg);
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28 sent = sent + 1;
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29 end
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30 end
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31 end
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32 if sent > 0 then
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33 module:log("debug", "Sent message to %d offline occupants", sent);
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34 end
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35 end);