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util/uuid.lua @ 3122:579f17b9f948
util.sasl.*: Adjusting authentication provider names. All '-' replaced with '_'
author | Tobias Markmann <tm@ayena.de> |
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date | Mon, 24 May 2010 18:15:16 +0200 |
parent | 2957:805b067cd13e |
child | 5776:bd0ff8ae98a8 |
child | 7010:001b3cff4ed8 |
rev | line source |
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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 -- |
758 | 5 -- This project is MIT/X11 licensed. Please see the |
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 |
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10 local m_random = math.random; |
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util.uuid: Return a string, not a number. Looked so innocent.
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11 local tostring = tostring; |
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12 local os_time = os.time; |
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13 local os_clock = os.clock; |
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14 local sha1 = require "util.hashes".sha1; |
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15 |
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16 module "uuid" |
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17 |
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18 local last_uniq_time = 0; |
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19 local function uniq_time() |
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20 local new_uniq_time = os_time(); |
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21 if last_uniq_time >= new_uniq_time then new_uniq_time = last_uniq_time + 1; end |
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22 last_uniq_time = new_uniq_time; |
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23 return new_uniq_time; |
44
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24 end |
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25 |
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26 local function new_random(x) |
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27 return sha1(x..os_clock()..tostring({}), true); |
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28 end |
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29 |
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30 local buffer = new_random(uniq_time()); |
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31 local function _seed(x) |
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32 buffer = new_random(buffer..x); |
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33 end |
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34 local function get_nibbles(n) |
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35 if #buffer < n then _seed(uniq_time()); end |
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36 local r = buffer:sub(0, n); |
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37 buffer = buffer:sub(n+1); |
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38 return r; |
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39 end |
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40 local function get_twobits() |
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41 return ("%x"):format(get_nibbles(1):byte() % 4 + 8); |
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42 end |
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43 |
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44 function generate() |
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45 -- generate RFC 4122 complaint UUIDs (version 4 - random) |
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46 return get_nibbles(8).."-"..get_nibbles(4).."-4"..get_nibbles(3).."-"..(get_twobits())..get_nibbles(3).."-"..get_nibbles(12); |
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47 end |
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48 seed = _seed; |
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49 |
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50 return _M; |