from __future__ import annotations
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import json
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from typing import Any
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class StrictJsonError(ValueError):
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pass
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def _pairs(values: list[tuple[str, Any]]) -> dict[str, Any]:
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result: dict[str, Any] = {}
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for key, value in values:
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if key in result:
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raise StrictJsonError(f"duplicate key: {key}")
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result[key] = value
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return result
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def loads(payload: bytes) -> Any:
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try:
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text = payload.decode("utf-8", errors="strict")
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return json.loads(text, object_pairs_hook=_pairs, parse_constant=lambda value: (_ for _ in ()).throw(StrictJsonError(value)))
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except (UnicodeDecodeError, json.JSONDecodeError) as exc:
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raise StrictJsonError("invalid strict UTF-8 JSON") from exc
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def canonical_bytes(value: Any, *, newline: bool = False) -> bytes:
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payload = json.dumps(value, ensure_ascii=False, sort_keys=True, separators=(",", ":")).encode("utf-8")
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return payload + (b"\n" if newline else b"")
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