# Source code for cattrs.preconf.ujson

    """Preconfigured converters for ujson."""
    from base64 import b85decode, b85encode
    from datetime import datetime
    from typing import Any, AnyStr, Type, TypeVar

    from ujson import dumps, loads

    from cattrs._compat import AbstractSet

    from ..converters import BaseConverter, Converter

    T = TypeVar("T")

    class UjsonConverter(Converter):

        def dumps(self, obj: Any, unstructure_as=None, **kwargs) -> str:
            return dumps(self.unstructure(obj, unstructure_as=unstructure_as), **kwargs)

        def loads(self, data: AnyStr, cl: Type[T], **kwargs) -> T:
            return self.structure(loads(data, **kwargs), cl)

    def configure_converter(converter: BaseConverter):
        """
        Configure the converter for use with the ujson library.

        * bytes are serialized as base64 strings
        * datetimes are serialized as ISO 8601
        * sets are serialized as lists
        """
        converter.register_unstructure_hook(
            bytes, lambda v: (b85encode(v) if v else b"").decode("utf8")
        )
        converter.register_structure_hook(bytes, lambda v, _: b85decode(v))

        converter.register_unstructure_hook(datetime, lambda v: v.isoformat())
        converter.register_structure_hook(datetime, lambda v, _: datetime.fromisoformat(v))

    def make_converter(*args, **kwargs) -> UjsonConverter:
        kwargs["unstruct_collection_overrides"] = {
            **kwargs.get("unstruct_collection_overrides", {}),
            AbstractSet: list,
        }
        res = UjsonConverter(*args, **kwargs)
        configure_converter(res)

        return res