Constructs an asn1crypto.x509.CRLDistributionPoints object

        :param name:
            A unicode string of the attribute name to use in exceptions

        :param value:
            Either a unicode string of a URL, or a 2-element tuple of a
            unicode string of a URL, plus an asn1crypto.x509.Certificate
            object that will be signing the CRL (for indirect CRLs).

        :return:
            None or an asn1crypto.x509.CRLDistributionPoints object

def _make_crl_distribution_points(self, name, value):
        """
        Constructs an asn1crypto.x509.CRLDistributionPoints object

        :param name:
            A unicode string of the attribute name to use in exceptions

        :param value:
            Either a unicode string of a URL, or a 2-element tuple of a
            unicode string of a URL, plus an asn1crypto.x509.Certificate
            object that will be signing the CRL (for indirect CRLs).

        :return:
            None or an asn1crypto.x509.CRLDistributionPoints object
        """

        if value is None:
            return None

        is_tuple = isinstance(value, tuple)
        if not is_tuple and not isinstance(value, str_cls):
            raise TypeError(_pretty_message(
                '''
                %s must be a unicode string or tuple of (unicode string,
                asn1crypto.x509.Certificate), not %s
                ''',
                name,
                _type_name(value)
            ))

        issuer = None
        if is_tuple:
            if len(value) != 2:
                raise ValueError(_pretty_message(
                    '''
                    %s must be a unicode string or 2-element tuple, not a
                    %s-element tuple
                    ''',
                    name,
                    len(value)
                ))

            if not isinstance(value[0], str_cls) or not isinstance(value[1], x509.Certificate):
                raise TypeError(_pretty_message(
                    '''
                    %s must be a tuple of (unicode string,
                    ans1crypto.x509.Certificate), not (%s, %s)
                    ''',
                    name,
                    _type_name(value[0]),
                    _type_name(value[1])
                ))

            url = value[0]
            issuer = value[1].subject
        else:
            url = value

        general_names = x509.GeneralNames([
            x509.GeneralName(
                name='uniform_resource_identifier',
                value=url
            )
        ])
        distribution_point_name = x509.DistributionPointName(
            name='full_name',
            value=general_names
        )
        distribution_point = x509.DistributionPoint({
            'distribution_point': distribution_point_name
        })
        if issuer:
            distribution_point['crl_issuer'] = x509.GeneralNames([
                x509.GeneralName(name='directory_name', value=issuer)
            ])

        return x509.CRLDistributionPoints([distribution_point])