fc244bb592
aka PEP 585, added in Python 3.9 - https://peps.python.org/pep-0585/ - https://docs.astral.sh/ruff/rules/non-pep585-annotation/
57 lines
1.8 KiB
Python
57 lines
1.8 KiB
Python
#
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# This file is licensed under the Affero General Public License (AGPL) version 3.
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#
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# Copyright (C) 2025 New Vector, Ltd
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Affero General Public License as
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# published by the Free Software Foundation, either version 3 of the
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# License, or (at your option) any later version.
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#
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# See the GNU Affero General Public License for more details:
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# <https://www.gnu.org/licenses/agpl_3.0.html>.
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#
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#
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import json
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from typing import (
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Any,
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)
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from immutabledict import immutabledict
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def _reject_invalid_json(val: Any) -> None:
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"""Do not allow Infinity, -Infinity, or NaN values in JSON."""
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raise ValueError("Invalid JSON value: '%s'" % val)
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def _handle_immutabledict(obj: Any) -> dict[Any, Any]:
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"""Helper for json_encoder. Makes immutabledicts serializable by returning
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the underlying dict
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"""
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if type(obj) is immutabledict:
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# fishing the protected dict out of the object is a bit nasty,
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# but we don't really want the overhead of copying the dict.
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try:
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# Safety: we catch the AttributeError immediately below.
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return obj._dict
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except AttributeError:
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# If all else fails, resort to making a copy of the immutabledict
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return dict(obj)
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raise TypeError(
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"Object of type %s is not JSON serializable" % obj.__class__.__name__
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)
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# A custom JSON encoder which:
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# * handles immutabledicts
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# * produces valid JSON (no NaNs etc)
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# * reduces redundant whitespace
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json_encoder = json.JSONEncoder(
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allow_nan=False, separators=(",", ":"), default=_handle_immutabledict
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)
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# Create a custom decoder to reject Python extensions to JSON.
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json_decoder = json.JSONDecoder(parse_constant=_reject_invalid_json)
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