Software /
code /
prosody
File
util/id.lua @ 12590:5eaf77114fdb
compat: Use table.pack (there since Lua 5.2) over our util.table
Added in d278a770eddc avoid having to deal with its absence in Lua 5.1.
No longer needed when Lua 5.1 support is dropped.
author | Kim Alvefur <zash@zash.se> |
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date | Mon, 11 Jul 2022 19:15:24 +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; }