util/uuid.lua
author Kim Alvefur <zash@zash.se>
Thu, 04 Nov 2021 01:00:06 +0100
branch0.11
changeset 12093 76b4e3f12b53
parent 7081 ec17115e3721
child 12359 a0ff5c438e9d
permissions -rw-r--r--
mod_pep: Wipe pubsub service on user deletion Data is already wiped from storage, but this ensures everything is properly unsubscribed, possibly with notifications etc. Clears recipient cache as well, since it is no longer relevant.
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-- Prosody IM
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-- Copyright (C) 2008-2010 Matthew Wild
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-- Copyright (C) 2008-2010 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 random = require "util.random";
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local random_bytes = random.bytes;
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local hex = require "util.hex".to;
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local m_ceil = math.ceil;
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local function get_nibbles(n)
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	return hex(random_bytes(m_ceil(n/2))):sub(1, n);
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end
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local function get_twobits()
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	return ("%x"):format(random_bytes(1):byte() % 4 + 8);
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end
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local 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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return {
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	get_nibbles=get_nibbles;
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	generate = generate ;
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	-- COMPAT
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	seed = random.seed;
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};