Scalr\Net\Ldap\LdapClient::isValidUsername PHP Метод

    public function isValidUsername()
    {
        $this->log('%s is called.', __FUNCTION__);
        if (empty($this->config->user) || !isset($this->config->password)) {
            throw new LdapException("Both LDAP user and password must be provided in the config " . "for the scalr.connections.ldap parameter's bag.");
        }
        $this->getConnection();
        if (($ret = $this->bindRdn()) == false) {
            throw new LdapException(sprintf("Cannot bind to ldap server with username '{$this->config->user}' and password in the scalr.connections.ldap section of config. %s", $this->getLdapError()));
        } else {
            if (stristr($this->username, "{$this->getConfig()->usernameAttribute}=")) {
                $filter = sprintf('(&%s(' . $this->getConfig()->usernameAttribute . '=%s))', $this->config->userFilter, self::realEscape($this->uid));
            } else {
                $filter = sprintf('(&%s(' . $this->getConfig()->usernameAttribute . '=%s))', $this->config->userFilter, self::realEscape(strtok($this->username, '@')));
            }
            $attrs = array('dn', 'memberof');
            if ($this->config->mailAttribute) {
                $mailAttribute = strtolower($this->config->mailAttribute);
                $attrs[] = $mailAttribute;
            }
            $query = @ldap_search($this->conn, $this->config->baseDn, $filter, $attrs, 0, 1);
            $this->log("Query baseDn (3):%s filter:%s, attributes: %s - %s", $this->config->baseDn, $filter, join(', ', $attrs), $query !== false ? 'OK' : 'Failed');
            if ($query !== false) {
                $results = ldap_get_entries($this->conn, $query);
                if ($results['count'] == 1) {
                    //Caches base DN to increase performance
                    $this->dn = $results[0]['dn'];
                    $this->memberofDn = $results[0]['memberof'];
                    if (isset($mailAttribute) && isset($results[0][$mailAttribute])) {
                        $this->email = (is_array($results[0][$mailAttribute]) ? $results[0][$mailAttribute][0] : $results[0][$mailAttribute]) . '';
                        $this->log('Email has been retrieved: %s', $this->email);
                    }
                    if (isset($this->memberofDn['count'])) {
                        unset($this->memberofDn['count']);
                    }
                    $ret = true;
                } else {
                    $ret = false;
                }
            } else {
                $ret = false;
            }
        }
        return $ret;
    }