prosody
301d58705667
util/uuid.lua

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util/uuid.lua @ 7100:301d58705667

mod_c2s, mod_s2s: Lower priority of session shutdown to negative, so that plugins hooking at the default priority run first (fixes #601)
author Kim Alvefur <zash@zash.se>
date Tue, 26 Jan 2016 00:28:07 +0100
parent 7076:ad9e683b8f0b
child 7078:ec17115e3721
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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 error = error;
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10 local round_up = math.ceil;
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11 local urandom, urandom_err = io.open("/dev/urandom", "r");
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12
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13 module "uuid"
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14
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15 local function get_nibbles(n)
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16 local binary_random = urandom:read(round_up(n/2));
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17 local hex_random = binary_random:gsub(".",
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18 function (x) return ("%02x"):format(x:byte()) end);
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19 return hex_random:sub(1, n);
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20 end
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21 local function get_twobits()
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22 return ("%x"):format(urandom:read(1):byte() % 4 + 8);
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23 end
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24
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25 function generate()
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26 if not urandom then
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27 error("Unable to obtain a secure random number generator, please see https://prosody.im/doc/random ("..urandom_err..")");
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28 end
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29 -- generate RFC 4122 complaint UUIDs (version 4 - random)
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30 return get_nibbles(8).."-"..get_nibbles(4).."-4"..get_nibbles(3).."-"..(get_twobits())..get_nibbles(3).."-"..get_nibbles(12);
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31 end
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32
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33 function seed()
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34 end
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35
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36 return _M;