prosody
553c6204fe5b
util/uuid.lua

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util/uuid.lua @ 12475:553c6204fe5b 0.12

util.argparse: Return final 'arg' table with positional arguments for convenience This is the same as the input table (which is mutated during processing), but if that table was created on the fly, such as by packing `...` it's convenient if it also gets returned from the parse function.
author Matthew Wild <mwild1@gmail.com>
date Mon, 25 Apr 2022 15:09:41 +0100
parent 12355:a0ff5c438e9d
child 12975:d10957394a3c
line wrap: on
line source

-- Prosody IM
-- Copyright (C) 2008-2010 Matthew Wild
-- Copyright (C) 2008-2010 Waqas Hussain
--
-- This project is MIT/X11 licensed. Please see the
-- COPYING file in the source package for more information.
--

local random = require "util.random";
local random_bytes = random.bytes;
local hex = require "util.hex".encode;
local m_ceil = math.ceil;

local function get_nibbles(n)
	return hex(random_bytes(m_ceil(n/2))):sub(1, n);
end

local function get_twobits()
	return ("%x"):format(random_bytes(1):byte() % 4 + 8);
end

local function generate()
	-- generate RFC 4122 complaint UUIDs (version 4 - random)
	return get_nibbles(8).."-"..get_nibbles(4).."-4"..get_nibbles(3).."-"..(get_twobits())..get_nibbles(3).."-"..get_nibbles(12);
end

return {
	get_nibbles=get_nibbles;
	generate = generate ;
	-- COMPAT
	seed = random.seed;
};