nginx secure link

gen.php

<?php
$ts = '1463646983';
$hash = str_replace('=', '',strtr(base64_encode(md5('1463646983 secret', TRUE)), '+/', '-_')); // base64url
echo $hash;
?>

nginx.conf

location /uploads/ {
    secure_link $arg_t,$arg_expires;  # token, expiration timestamp
    secure_link_md5 "$secure_link_expires secret";

    if ($secure_link = "") {
        return 403;
    }

    if ($secure_link = "0") {
        return 410;
    }
}