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91 lines
3.4 KiB
Python
91 lines
3.4 KiB
Python
# Copyright (c) 2011-2020 Eric Froemling
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#
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# Permission is hereby granted, free of charge, to any person obtaining a copy
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# of this software and associated documentation files (the "Software"), to deal
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# in the Software without restriction, including without limitation the rights
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# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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# copies of the Software, and to permit persons to whom the Software is
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# furnished to do so, subject to the following conditions:
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#
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# The above copyright notice and this permission notice shall be included in
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# all copies or substantial portions of the Software.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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# SOFTWARE.
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# -----------------------------------------------------------------------------
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"""Custom json compressor/decompressor with support for more data times/etc."""
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from __future__ import annotations
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import datetime
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import json
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from typing import TYPE_CHECKING
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if TYPE_CHECKING:
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from typing import Any
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# Special attr we included for our extended type information
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# (extended-json-type)
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TYPE_TAG = '_xjtp'
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_pytz_utc: Any
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# We don't *require* pytz since it must be installed through pip
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# but it is used by firestore client for its utc tzinfos.
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# (in which case it should be installed as a dependency anyway)
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try:
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import pytz
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_pytz_utc = pytz.utc
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except ModuleNotFoundError:
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_pytz_utc = None # pylint: disable=invalid-name
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class ExtendedJSONEncoder(json.JSONEncoder):
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"""Custom json encoder supporting additional types."""
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def default(self, obj: Any) -> Any: # pylint: disable=W0221
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if isinstance(obj, datetime.datetime):
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# We only support timezone-aware utc times.
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if (obj.tzinfo is not datetime.timezone.utc
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and (_pytz_utc is None or obj.tzinfo is not _pytz_utc)):
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raise ValueError(
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'datetime values must have timezone set as timezone.utc')
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return {
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TYPE_TAG:
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'dt',
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'v': [
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obj.year, obj.month, obj.day, obj.hour, obj.minute,
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obj.second, obj.microsecond
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],
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}
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return super().default(obj)
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class ExtendedJSONDecoder(json.JSONDecoder):
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"""Custom json decoder supporting extended types."""
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def __init__(self, *args: Any, **kwargs: Any):
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json.JSONDecoder.__init__(self,
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object_hook=self.object_hook,
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*args,
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**kwargs)
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def object_hook(self, obj: Any) -> Any: # pylint: disable=E0202
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"""Custom hook."""
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if TYPE_TAG not in obj:
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return obj
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objtype = obj[TYPE_TAG]
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if objtype == 'dt':
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vals = obj.get('v', [])
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if len(vals) != 7:
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raise ValueError('malformed datetime value')
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return datetime.datetime( # type: ignore
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*vals, tzinfo=datetime.timezone.utc)
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return obj
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