#!/usr/bin/env perl
#
# Copyright (c) 2023 Mischa Peters <mischa @ openbsd.amsterdam>
#
# Permission to use, copy, modify, and distribute this software for any
# purpose with or without fee is hereby granted, provided that the above
# copyright notice and this permission notice appear in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
# OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
#
use 5.024;
use strict;
use warnings;
use autodie;
use Fcntl qw(:flock);
use File::Basename;
use File::stat;
use POSIX qw(strftime);

my $ttl = "300";
my $workdir = dirname($0);

opendir my $dh, "${workdir}/tokens";
while (my $file = readdir $dh) {
	chomp $file;
	next if $file =~ /^\./;

	open my $fh, '<', "${workdir}/tokens/$file";
	my $client_ip = <$fh>;
	chomp $client_ip;
	close $fh;

	my $mtime = stat("${workdir}/tokens/${file}")->mtime();
	if ((time() - $mtime) > $ttl) {
		_log("$client_ip $file removed");
		unlink("${workdir}/tokens/${file}");
	}
}

sub _log {
	my ($msg) = @_;
	open my $fh, '>>', '/var/log/ard.log';
	flock $fh, LOCK_EX;
	print $fh sprintf("%s %s: %s \n", strftime("%b %d %H:%M:%S", localtime), basename($0), $msg);
	close $fh;
}