<?php
function get_blog_domain($old_blog_id) {
    global $wpdb;
    $id = int($old_blog_id);
    $sql = sprintf("SELECT blog form old_noblogs_id WHERE id=%d", $id);
    $result = $wpdb->get_row($sql);
    if (!$result) {
        return;
    }
    return sprintf("%s.noblogs.org", $result->blog);
}

ob_start();
// Load wordpress api.
define('WP_CACHE',false);
require_once('/opt/noblogs/www/wp-load.php');
if (isset($_GET['blogId']) && is_numeric($_GET['blogId'])) {
    $domain = get_blog_domain($_GET['blogId']);
    if (!$domain) {
        header("Location: https://noblogs.org");
    } else {
        if (isset($_SERVER['HTTPS']) && $_SERVER['HTTPS'] == 'on') {
            $scheme = 'https://';
        } else {
            $scheme = 'http://';
        }
        header(sprintf("Location: %s%s/rss2", $scheme, $domain));
    }
}
ob_flush();
?>