prosody
5df2f240173b
util/uuid.lua

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util/uuid.lua @ 8343:5df2f240173b

util.pubsub: Return an empty list if specific item asked for does not exist (thanks jonasw)
author Kim Alvefur <zash@zash.se>
date Wed, 18 Oct 2017 21:21:43 +0200
parent 7078:ec17115e3721
child 12355:a0ff5c438e9d
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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841d61be198f Remove version number from copyright headers
Matthew Wild <mwild1@gmail.com>
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1 -- Prosody IM
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b7049746bd29 Update copyright headers for 2010
Matthew Wild <mwild1@gmail.com>
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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 "util.random";
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10 local random_bytes = random.bytes;
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11 local hex = require "util.hex".to;
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12 local m_ceil = math.ceil;
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14 local function get_nibbles(n)
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15 return hex(random_bytes(m_ceil(n/2))):sub(1, n);
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16 end
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17
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18 local function get_twobits()
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19 return ("%x"):format(random_bytes(1):byte() % 4 + 8);
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20 end
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21
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22 local function generate()
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23 -- generate RFC 4122 complaint UUIDs (version 4 - random)
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24 return get_nibbles(8).."-"..get_nibbles(4).."-4"..get_nibbles(3).."-"..(get_twobits())..get_nibbles(3).."-"..get_nibbles(12);
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25 end
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26
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27 return {
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28 get_nibbles=get_nibbles;
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29 generate = generate ;
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30 -- COMPAT
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31 seed = random.seed;
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32 };