anime/api/subtitles.php

<?php
chdir("..");
require_once "src/util.php";
require_once "src/ffmpeg.php";

$query = $_SERVER["QUERY_STRING"];
parse_str($query, $param);

$cacheid = hash("sha256", $query);

$path = urlsafe_b64decode($param["file"]);
$path = "./" . $path;
$path = str_replace("..", "", $path);

$index = $param["s"] ?? 0;

if (!is_dir("video/"))
    mkdir("video/");

$err = ffmpeg($path, "video/$cacheid.vtt", ["-map", "0:s:$index"]);

if ($err)
{
    header("Content-Type: text/plain");
    echo $err;
} else {
    header("Location: ../video/$cacheid.vtt", true, 302);
}

// Remove old videos and subtitles
foreach (scandir("video/") as $file)
{
    $atime = fileatime("video/$file");
    if (time() - $atime > 3600)
        unlink("video/$file");
}
?>