Firesphere / silverstripe-yubiauth

    {

        $yubikeyMember = Member::get()->filter(array('Yubikey' => $yubiFingerprint))->first();

        // Yubikeys have a unique fingerprint, if we find a different member with this yubikey ID, something's wrong

        if ($yubikeyMember && $yubikeyMember->ID !== $member->ID) {

            $validationMessage = ValidationResult::create(false,

                _t('YubikeyAuthenticator.DUPLICATE', 'Yubikey is duplicate'));

            self::updateForm($validationMessage);

            $member->registerFailedLogin();

            return false;

        }

        // If the member has a yubikey ID set, compare it to the fingerprint.

        if ($member->Yubikey && strpos($yubiFingerprint, $member->Yubikey) !== 0) {

            self::updateForm();

    private static function checkNoYubiLogins($member)

    {

        $maxNoYubi = self::config()->get('MaxNoYubiLogin');

        if ($maxNoYubi > 0 && $maxNoYubi <= $member->NoYubikeyCount) {

            $validationError = ValidationResult::create(false,

                _t('YubikeyAuthenticator.ERRORMAXYUBIKEY', 'Maximum login without yubikey exceeded'));

            self::updateForm($validationError);

            $member->registerFailedLogin();

            return false;

        }

        return $member;

    }

        $diff = $date2->diff($date1)->format("%a");

        $maxNoYubiDays = self::config()->get('MaxNoYubiLoginDays');

        if ($maxNoYubiDays > 0 && $diff >= $maxNoYubiDays) {

            $validationError = ValidationResult::create(false,

                _t('YubikeyAuthenticator.ERRORMAXYUBIKEYDAYS', 'Maximum days without yubikey exceeded'));

            self::updateForm($validationError);

            $member->registerFailedLogin();

            return false;

        }

        return $member;

    }

}