64 lines
2.1 KiB
Python
64 lines
2.1 KiB
Python
"""Path guards for local Monte Carlo template manifests."""
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from __future__ import annotations
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import json
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import os
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from pathlib import Path
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def _allow_external_paths() -> bool:
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return os.getenv("MCD_ALLOW_EXTERNAL_PATHS", "").lower() in {"1", "true", "yes"}
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def _resolve_local_path(raw_path: str, *, expect_file: bool = False, create_parent: bool = False) -> Path:
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value = str(raw_path).strip()
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if not value or "\0" in value:
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raise ValueError("Path must be a non-empty filesystem path")
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base = Path.cwd().resolve()
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candidate = Path(value).expanduser()
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resolved = (candidate if candidate.is_absolute() else base / candidate).resolve()
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if not _allow_external_paths():
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try:
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resolved.relative_to(base)
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except ValueError as exc:
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raise ValueError(
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f"Path must stay under the current working directory: {raw_path!r}"
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) from exc
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if expect_file and not resolved.is_file():
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raise FileNotFoundError(f"Input file not found: {resolved}")
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if create_parent:
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resolved.parent.mkdir(parents=True, exist_ok=True)
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return resolved
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def safe_input_json_path(raw_path: str) -> Path:
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path = _resolve_local_path(raw_path, expect_file=True)
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if path.suffix.lower() != ".json":
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raise ValueError(f"Input manifest must be a .json file: {path}")
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return path
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def safe_output_json_path(raw_path: str) -> Path:
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path = _resolve_local_path(raw_path, create_parent=True)
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if path.suffix.lower() != ".json":
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raise ValueError(f"Output manifest must be a .json file: {path}")
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return path
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def safe_existing_directory(raw_path: str) -> Path:
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path = _resolve_local_path(raw_path)
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if not path.is_dir():
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raise NotADirectoryError(f"Directory not found: {path}")
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return path
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def read_json_file(raw_path: str):
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with safe_input_json_path(raw_path).open() as fh:
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return json.load(fh)
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def write_json_file(raw_path: str, payload, *, indent: int = 2, default=None) -> None:
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output_path = safe_output_json_path(raw_path)
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output_path.write_text(json.dumps(payload, indent=indent, default=default), encoding="utf-8")
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