<?php

/**
 * Serves the current client script (timekeeperLocal.php) for the students'
 * machines to download:
 *
 *   wget -O .timekeeper.php "https://overlord.pfip.au/e107_plugins/timekeeper/localUpdater.php"
 *
 * Changes from the current repo version:
 *  - ob_clean() raised a notice when no output buffer was active; if
 *    display_errors was on, that text was prepended to the download and
 *    pushed the "#!/bin/php" line off line 1 (so the script could no longer
 *    be run directly). It only cleans a buffer that exists now
 *  - the file is found next to this script, not relative to the working directory
 *  - a missing file now answers 404 instead of an empty 200
 *  - Cache-Control: no-store, so clients always get the newest version
 */
$file = __DIR__ . '/timekeeperLocal.php';

if (!is_file($file)) {
    http_response_code(404);
    exit;
}

while (ob_get_level() > 0) {
    ob_end_clean();
}

header('Content-Description: File Transfer');
header('Content-Type: application/octet-stream');
header('Content-Disposition: attachment; filename=' . basename($file));
header('Content-Transfer-Encoding: binary');
header('Expires: 0');
header('Cache-Control: no-store, must-revalidate');
header('Pragma: no-cache');
header('Content-Length: ' . filesize($file));
readfile($file);
exit;