<?php
// Router of the CI jobs' dev server (see serve.sh). `php -S` answers no Range requests, and Chrome
// cannot seek in a video served without them (#402): a clip stayed at the video's first frame. On
// stein2 nginx does this. Here the converted videos get their ranges; everything else is left to
// the server as before.

$path = rawurldecode((string) parse_url($_SERVER['REQUEST_URI'] ?? '', PHP_URL_PATH));
if (!preg_match('#^/game-maker/data/videos/[0-9a-z]+/[0-9a-f]{64}\.mp4$#', $path)) {
    return false;
}
$file = $_SERVER['DOCUMENT_ROOT'] . $path;
if (!is_file($file)) {
    return false;
}

$size = filesize($file);
$start = 0;
$end = $size - 1;
header('Content-Type: video/mp4');
header('Accept-Ranges: bytes');
if (preg_match('/^bytes=(\d*)-(\d*)$/', $_SERVER['HTTP_RANGE'] ?? '', $range)) {
    if ($range[1] === '') {
        $start = max(0, $size - (int) $range[2]);
    } else {
        $start = (int) $range[1];
        if ($range[2] !== '') {
            $end = min($end, (int) $range[2]);
        }
    }
    if ($start > $end) {
        http_response_code(416);
        header("Content-Range: bytes */$size");
        return true;
    }
    http_response_code(206);
    header("Content-Range: bytes $start-$end/$size");
}
header('Content-Length: ' . ($end - $start + 1));
if ($_SERVER['REQUEST_METHOD'] === 'HEAD') {
    return true;
}
$in = fopen($file, 'rb');
$out = fopen('php://output', 'wb');
stream_copy_to_stream($in, $out, $end - $start + 1, $start);
return true;