add updates libs

server/libs/cattrs/preconf/tomllib.py

@@ -0,0 +1,94 @@
+"""Preconfigured converters for tomllib."""
+
+from base64 import b85decode, b85encode
+from collections.abc import Set
+from datetime import date, datetime
+from enum import Enum
+from operator import attrgetter
+from typing import Any, TypeVar, Union
+
+try:
+    from tomllib import loads
+except ImportError:
+    from tomli import loads
+
+try:
+    from tomli_w import dumps
+except ImportError:  # pragma: nocover
+    dumps = None
+
+from .._compat import is_mapping, is_subclass
+from ..converters import BaseConverter, Converter
+from ..fns import identity
+from ..strategies import configure_union_passthrough
+from . import validate_datetime, wrap
+
+__all__ = ["TomllibConverter", "configure_converter", "make_converter"]
+
+T = TypeVar("T")
+_enum_value_getter = attrgetter("_value_")
+
+
+class TomllibConverter(Converter):
+    """A converter subclass specialized for tomllib."""
+
+    if dumps is not None:
+
+        def dumps(self, obj: Any, unstructure_as: Any = None, **kwargs: Any) -> str:
+            return dumps(self.unstructure(obj, unstructure_as=unstructure_as), **kwargs)
+
+    def loads(self, data: str, cl: type[T], **kwargs: Any) -> T:
+        return self.structure(loads(data, **kwargs), cl)
+
+
+def configure_converter(converter: BaseConverter):
+    """
+    Configure the converter for use with the tomllib library.
+
+    * bytes are serialized as base85 strings
+    * sets are serialized as lists
+    * tuples are serializas as lists
+    * mapping keys are coerced into strings when unstructuring
+    * dates and datetimes are left for tomllib to handle
+    """
+    converter.register_structure_hook(bytes, lambda v, _: b85decode(v))
+    converter.register_unstructure_hook(
+        bytes, lambda v: (b85encode(v) if v else b"").decode("utf8")
+    )
+
+    @converter.register_unstructure_hook_factory(is_mapping)
+    def gen_unstructure_mapping(cl: Any, unstructure_to=None):
+        key_handler = str
+        args = getattr(cl, "__args__", None)
+        if args:
+            if is_subclass(args[0], str):
+                key_handler = _enum_value_getter if is_subclass(args[0], Enum) else None
+            elif is_subclass(args[0], bytes):
+
+                def key_handler(k: bytes):
+                    return b85encode(k).decode("utf8")
+
+        return converter.gen_unstructure_mapping(
+            cl, unstructure_to=unstructure_to, key_handler=key_handler
+        )
+
+    converter.register_unstructure_hook(datetime, identity)
+    converter.register_structure_hook(datetime, validate_datetime)
+    converter.register_unstructure_hook(date, identity)
+    converter.register_structure_hook(
+        date, lambda v, _: v if isinstance(v, date) else date.fromisoformat(v)
+    )
+    configure_union_passthrough(Union[str, int, float, bool], converter)
+
+
+@wrap(TomllibConverter)
+def make_converter(*args: Any, **kwargs: Any) -> TomllibConverter:
+    kwargs["unstruct_collection_overrides"] = {
+        Set: list,
+        tuple: list,
+        **kwargs.get("unstruct_collection_overrides", {}),
+    }
+    res = TomllibConverter(*args, **kwargs)
+    configure_converter(res)
+
+    return res