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util/id.lua @ 12591:494577d883ff
util.table: Fix inaccurate comment
Probably a duplicate of the comment next to Lmove, recorded by mistake
Lpack can probably be removed at some point in the near future once we
are confident it is not used anywhere.
author | Kim Alvefur <zash@zash.se> |
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date | Mon, 11 Jul 2022 20:02:10 +0200 |
parent | 12111:f8d280215633 |
child | 12975:d10957394a3c |
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-- Prosody IM -- Copyright (C) 2008-2017 Matthew Wild -- Copyright (C) 2008-2017 Waqas Hussain -- Copyright (C) 2008-2017 Kim Alvefur -- -- This project is MIT/X11 licensed. Please see the -- COPYING file in the source package for more information. -- local s_gsub = string.gsub; local random_bytes = require "util.random".bytes; local base64_encode = require "util.encodings".base64.encode; local b64url = { ["+"] = "-", ["/"] = "_", ["="] = "" }; local function b64url_random(len) return (s_gsub(base64_encode(random_bytes(len)), "[+/=]", b64url)); end return { -- sizes divisible by 3 fit nicely into base64 without padding== -- for short lived things with low risk of collisions tiny = function() return b64url_random(3); end; -- close to 8 bytes, should be good enough for relatively short lived or uses -- scoped by host or users, half the size of an uuid short = function() return b64url_random(9); end; -- more entropy than uuid at 2/3 the size -- should be okay for globally scoped ids or security token medium = function() return b64url_random(18); end; -- as long as an uuid but MOAR entropy long = function() return b64url_random(27); end; -- pick your own adventure custom = function (size) return function () return b64url_random(size); end; end; }