gen_auth

function gen_auth($subscriber_id = null, $mailinglist_id = null) {
            $mailinglist_id = false;

            if (!empty($subscriber_id)) {
                global $Db, $Subscriber, $SubscribersList;
                $Db -> model = $Subscriber -> model;
                $subscriber = $Db -> find(array('id' => $subscriber_id));
                $authkey = (empty($subscriber -> authkey)) ? md5($subscriber_id) : $subscriber -> authkey;

                if (!empty($mailinglist_id)) {
                    $Db -> model = $SubscribersList -> model;
                    if ($subscriberslist = $Db -> find(array('subscriber_id' => $subscriber_id, 'list_id' => $mailinglist_id))) {
                        if ($subscriberslist -> authinprog == "Y" && !empty($subscriberslist -> authkey) && $subscriberslist -> authkey == $authkey) {
                            $authkey = $subscriberslist -> authkey;
                        } else {
                            $Db -> model = $SubscribersList -> model;
                            $Db -> save_field('authkey', $authkey, array('list_id' => $mailinglist_id, 'subscriber_id' => $subscriber_id));
                            $Db -> model = $SubscribersList -> model;
                            $Db -> save_field('authinprog', "Y", array('list_id' => $mailinglist_id, 'subscriber_id' => $subscriber_id));
                        }
                    }
                } else {
                    if (!empty($subscriber)) {
                        if ($subscriber -> authinprog == "Y" && !empty($subscriber -> authkey)) {
                            $authkey = $subscriber -> authkey;
                        } else {
                            $Db -> model = $Subscriber -> model;
                            $Db -> save_field('authkey', $authkey, array('id' => $subscriber_id));
                            $Db -> model = $Subscriber -> model;
                            $Db -> save_field('authinprog', "Y", array('id' => $subscriber_id));
                        }
                    }
                }
            }

            return $authkey;
        }