util.stanza: Allow U+7F
Allowed by XML despite arguably being a control character.
Drops the part of the range meant to rule out octets invalid in UTF-8
(\247 starts a 4-byte sequence), since UTF-8 correctness is validated by
util.encodings.utf8.valid().
-- 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 {
short = function () return b64url_random(6); end;
medium = function () return b64url_random(12); end;
long = function () return b64url_random(24); end;
custom = function (size)
return function () return b64url_random(size); end;
end;
}