prosody
a1c927323f06
util/random.lua

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util/random.lua @ 13273:a1c927323f06

mod_tokenauth: Delete grants without tokens after period Generally it is expected that a grant would have at least one token as long as the grant is in active use. Refresh tokens issued by mod_http_oauth2 have a lifetime of one week by default, so the idea here is that if that refresh token expired and another week goes by without the grant being used, then the whole grant can be removed.
author Kim Alvefur <zash@zash.se>
date Mon, 16 Oct 2023 23:51:52 +0200
parent 12975:d10957394a3c
line wrap: on
line source

-- Prosody IM
-- Copyright (C) 2008-2014 Matthew Wild
-- Copyright (C) 2008-2014 Waqas Hussain
--
-- This project is MIT/X11 licensed. Please see the
-- COPYING file in the source package for more information.
--

local ok, crand = pcall(require, "prosody.util.crand");
if ok and pcall(crand.bytes, 1) then return crand; end

local urandom, urandom_err = io.open("/dev/urandom", "r");

local function bytes(n)
	local data, err = urandom:read(n);
	if not data then
		if err then
			error("Unable to retrieve data from secure random number generator (/dev/urandom): "..tostring(err));
		else
			error("Secure random number generator (/dev/urandom) returned an end-of-file condition");
		end
	end
	return data;
end

if not urandom then
	function bytes()
		error("Unable to obtain a secure random number generator, please see https://prosody.im/doc/random ("..urandom_err..")");
	end
end

return {
	bytes = bytes;
	_source = "/dev/urandom";
};