prosody
93cdd1ece689
util/uuid.lua

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Software / code / prosody

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util/uuid.lua @ 11047:93cdd1ece689

mod_posix: Remove ancient undocumented user switching User switching has been done by prosodyctl or init scripts for a very long time now, so this is not needed. Using this would not have worked with module reloading (e.g. to reload certificates) since ports are closed and re-bound, which would then not be allowed. Today there exists better ways to grant low ports, i.e. capabilities(7) <Zash> Why do we have this? <MattJ> Remove it
author Kim Alvefur <zash@zash.se>
date Mon, 24 Aug 2020 19:48:47 +0200
parent 7078:ec17115e3721
child 12355:a0ff5c438e9d
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".to;
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;
};