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40 lines
1.3 KiB
40 lines
1.3 KiB
-- Prosody IM
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-- Copyright (C) 2008-2017 Matthew Wild
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-- Copyright (C) 2008-2017 Waqas Hussain
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-- Copyright (C) 2008-2017 Kim Alvefur
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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 s_gsub = string.gsub;
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local random_bytes = require "prosody.util.random".bytes;
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local base64_encode = require "prosody.util.encodings".base64.encode;
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local b64url = { ["+"] = "-", ["/"] = "_", ["="] = "" };
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local function b64url_random(len)
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return (s_gsub(base64_encode(random_bytes(len)), "[+/=]", b64url));
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end
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return {
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-- sizes divisible by 3 fit nicely into base64 without padding==
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-- for short lived things with low risk of collisions
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tiny = function() return b64url_random(3); end;
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-- close to 8 bytes, should be good enough for relatively short lived or uses
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-- scoped by host or users, half the size of an uuid
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short = function() return b64url_random(9); end;
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-- more entropy than uuid at 2/3 the size
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-- should be okay for globally scoped ids or security token
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medium = function() return b64url_random(18); end;
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-- as long as an uuid but MOAR entropy
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long = function() return b64url_random(27); end;
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-- pick your own adventure
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custom = function (size)
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return function () return b64url_random(size); end;
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end;
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}
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