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https://github.com/bjc/prosody.git
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50 lines
1.2 KiB
Lua
50 lines
1.2 KiB
Lua
-- Prosody IM
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-- Copyright (C) 2008-2009 Matthew Wild
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-- Copyright (C) 2008-2009 Waqas Hussain
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--
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-- This project is MIT/X11 licensed. Please see the
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-- COPYING file in the source package for more information.
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--
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local m_random = math.random;
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local tostring = tostring;
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local os_time = os.time;
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local os_clock = os.clock;
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local sha1 = require "util.hashes".sha1;
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module "uuid"
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local last_uniq_time = 0;
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local function uniq_time()
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local new_uniq_time = os_time();
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if last_uniq_time >= new_uniq_time then new_uniq_time = last_uniq_time + 1; end
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last_uniq_time = new_uniq_time;
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return new_uniq_time;
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end
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local function new_random(x)
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return sha1(x..os_clock()..tostring({}), true);
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end
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local buffer = new_random(uniq_time());
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local function _seed(x)
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buffer = new_random(buffer..x);
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end
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local function get_nibbles(n)
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if #buffer < n then seed(uniq_time()); end
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local r = buffer:sub(0, n);
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buffer = buffer:sub(n+1);
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return r;
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end
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local function get_twobits()
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return ("%x"):format(get_nibbles(1):byte() % 4 + 8);
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end
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function generate()
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-- generate RFC 4122 complaint UUIDs (version 4 - random)
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return get_nibbles(8).."-"..get_nibbles(4).."-4"..get_nibbles(3).."-"..(get_twobits())..get_nibbles(3).."-"..get_nibbles(12);
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end
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seed = _seed;
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return _M;
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