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63 lines
2.1 KiB
Python
63 lines
2.1 KiB
Python
"""Invariants for utils.fast_safe_load.
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fast_safe_load is a drop-in for yaml.safe_load that prefers the libyaml
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CSafeLoader C extension for speed. These tests assert the behavior contract
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(it parses identically to safe_load across input shapes), not a snapshot of
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any particular document.
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"""
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import io
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import yaml
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from utils import fast_safe_load, _get_fast_yaml_loader
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_DOCS = [
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"", # empty document -> None
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"a: 1\nb: two\nc: 3.5\n",
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"list: [1, 2, 3]\nnested:\n k: v\n flag: true\n empty: null\n",
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"name: skill-x\nmetadata:\n hermes:\n tags: [alpha, beta]\n category: devops\n",
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"- one\n- two\n- three\n", # top-level sequence
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"scalar string", # bare scalar
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]
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def test_equivalent_to_safe_load_for_strings():
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for doc in _DOCS:
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assert fast_safe_load(doc) == yaml.safe_load(doc), repr(doc)
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def test_equivalent_to_safe_load_for_file_objects():
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for doc in _DOCS:
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assert fast_safe_load(io.StringIO(doc)) == yaml.safe_load(io.StringIO(doc)), repr(doc)
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def test_empty_document_returns_none():
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# Callers rely on ``fast_safe_load(...) or {}`` — empty must be falsy.
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assert fast_safe_load("") is None
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def test_prefers_c_loader_when_available():
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loader = _get_fast_yaml_loader()
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# If libyaml is compiled in, we must be using the C loader; otherwise the
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# pure-Python SafeLoader is an acceptable fallback. Either way it must be a
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# safe loader (never the unsafe full Loader).
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c_loader = getattr(yaml, "CSafeLoader", None)
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if c_loader is not None:
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assert loader is c_loader
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else:
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assert loader is yaml.SafeLoader
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def test_rejects_arbitrary_python_objects_like_safe_load():
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# Safe loaders must not construct arbitrary Python objects. This tag is
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# accepted by the unsafe Loader but rejected by Safe/CSafe loaders.
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dangerous = "!!python/object/apply:os.system ['echo pwned']\n"
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try:
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fast_safe_load(dangerous)
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raised = False
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except yaml.YAMLError:
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raised = True
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assert raised, "fast_safe_load must reject python/object tags like safe_load"
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