class PublicKey(BaseModel):
    """Contact public cryptographic keys model."""

    user_id = columns.UUID(primary_key=True)
    resource_id = columns.UUID(primary_key=True)    # clustering key
    key_id = columns.UUID(primary_key=True)         # clustering key

    resource_type = columns.Text()
    label = columns.Text()

    date_insert = columns.DateTime(default=datetime.datetime.now(tz=pytz.utc))
    date_update = columns.DateTime()
    expire_date = columns.DateTime()

    key = columns.Text()
    fingerprint = columns.Text()

    # JWT parameters
    kty = columns.Text()    # rsa / ec
    use = columns.Text()    # sig / enc
    alg = columns.Text()    # algorithm
    # Elliptic curve public key parameters (rfc7518 6.2.1)
    crv = columns.Text()
    x = columns.Integer()
    y = columns.Integer()