File

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−-- 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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−
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−local s_gsub = string.gsub;
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−local random_bytes = require "util.random".bytes;
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−local base64_encode = require "util.encodings".base64.encode;
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−
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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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−
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−return {
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−	short =  function () return b64url_random(6); end;
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−	medium = function () return b64url_random(12); end;
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−	long =   function () return b64url_random(24); end;
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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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−}