streams/Code/Module/Xref.php

<?php

namespace Code\Module;

use Code\Web\Controller;

class Xref extends Controller
{

    public function init()
    {
        // Sets a referral URL using an xchan directly
        // Link format: example.com/xref/[xchan]/[TargetURL]
        // Target URL is optional.
        // Cookie lasts 24 hours to survive a browser restart.  Contains no personal
        // information at all - just somebody else's xchan.
        $referrer = argv(1);
        $expire = time() + 60 * 60 * 2;
        $path = 'xref';
        setcookie($path, $referrer, $expire, "/");
        $url = '';

        if (argc() > 2) {
            $url = argv(2);
        }

        goaway(z_root() . '/' . $url);
    }
}