prosody
790f60c0843b
util/uuid.lua

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util/uuid.lua @ 13459:790f60c0843b

util.startup: Back out 598df17b8ebb Broke signal handling again, such that an early s2s connection results in libunbound catching signals and getting Prosody killed on e.g. SIGHUP This returns to the situation where prosody --daemonize does not respond to signals.
author Kim Alvefur <zash@zash.se>
date Sun, 10 Mar 2024 15:56:01 +0100
parent 13317:e6a5f196fc1f
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rev   line source
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Matthew Wild <mwild1@gmail.com>
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1 -- Prosody IM
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2 -- Copyright (C) 2008-2010 Matthew Wild
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3 -- Copyright (C) 2008-2010 Waqas Hussain
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4 --
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b1885732e979 GPL->MIT!
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5 -- This project is MIT/X11 licensed. Please see the
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6 -- COPYING file in the source package for more information.
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7 --
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8
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9 local random = require "prosody.util.random";
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10 local random_bytes = random.bytes;
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11 local time = require "prosody.util.time";
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12 local hex = require "prosody.util.hex".encode;
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13 local m_ceil = math.ceil;
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14 local m_floor = math.floor;
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16 local function get_nibbles(n)
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17 return hex(random_bytes(m_ceil(n/2))):sub(1, n);
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18 end
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19
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20 local function get_twobits()
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21 return ("%x"):format(random_bytes(1):byte() % 4 + 8);
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22 end
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23
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24 local function generate()
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25 -- generate RFC 4122 complaint UUIDs (version 4 - random)
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26 return get_nibbles(8).."-"..get_nibbles(4).."-4"..get_nibbles(3).."-"..(get_twobits())..get_nibbles(3).."-"..get_nibbles(12);
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27 end
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28
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29 local function generate_v7()
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30 -- Sortable based on time and random
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31 -- https://datatracker.ietf.org/doc/html/draft-peabody-dispatch-new-uuid-format-01#section-4.4
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32 local t = time.now();
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33 local unixts = m_floor(t);
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34 local unixts_a = m_floor(unixts / 16);
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35 local unixts_b = m_floor(unixts % 16);
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36 local subsec = t % 1;
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37 local subsec_a = m_floor(subsec * 0x1000);
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38 local subsec_b = m_floor(subsec * 0x1000000) % 0x1000;
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39 return ("%08x-%x%03x-7%03x-%4s-%12s"):format(unixts_a, unixts_b, subsec_a, subsec_b, get_twobits() .. get_nibbles(3), get_nibbles(12));
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40 end
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41
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42 return {
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43 v4 = generate;
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44 v7 = generate_v7;
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45 get_nibbles=get_nibbles;
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46 generate = generate ;
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47 -- COMPAT
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48 seed = random.seed;
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49 };