Source code for cattr.preconf.json
"""Preconfigured converters for the stdlib json."""
from base64 import b85decode, b85encode
from datetime import datetime
from .._compat import Counter, Set
from ..converters import Converter, GenConverter
[docs]def configure_converter(converter: Converter):
"""
Configure the converter for use with the stdlib json module.
* bytes are serialized as base64 strings
* datetimes are serialized as ISO 8601
* counters are serialized as dicts
* 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)
)
[docs]def make_converter(*args, **kwargs) -> GenConverter:
kwargs["unstruct_collection_overrides"] = {
**kwargs.get("unstruct_collection_overrides", {}),
Set: list,
Counter: dict,
}
res = GenConverter(*args, **kwargs)
configure_converter(res)
return res