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"""ACME JSON fields."""
import datetime
from typing import Any
import logging
import josepy as jose
import pyrfc3339
logger = logging.getLogger(__name__)
class Fixed(jose.Field):
"""Fixed field."""
def __init__(self, json_name: str, value: Any) -> None:
self.value = value
super().__init__(
json_name=json_name, default=value, omitempty=False)
def decode(self, value: Any) -> Any:
if value != self.value:
raise jose.DeserializationError('Expected {0!r}'.format(self.value))
return self.value
def encode(self, value: Any) -> Any:
if value != self.value:
logger.warning(
'Overriding fixed field (%s) with %r', self.json_name, value)
return value
class RFC3339Field(jose.Field):
"""RFC3339 field encoder/decoder.
Handles decoding/encoding between RFC3339 strings and aware (not
naive) `datetime.datetime` objects
(e.g. ``datetime.datetime.now(pytz.utc)``).
"""
@classmethod
def default_encoder(cls, value: datetime.datetime) -> str:
return pyrfc3339.generate(value)
@classmethod
def default_decoder(cls, value: str) -> datetime.datetime:
try:
return pyrfc3339.parse(value)
except ValueError as error:
raise jose.DeserializationError(error)
def fixed(json_name: str, value: Any) -> Any:
"""Generates a type-friendly Fixed field."""
return Fixed(json_name, value)
def rfc3339(json_name: str, omitempty: bool = False) -> Any:
"""Generates a type-friendly RFC3339 field."""
return RFC3339Field(json_name, omitempty=omitempty)