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gh-79459 tempfile: Raise a ValueError if the prefix or suffix contains a directory component. #150477

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gh-79459 tempfile: Raise a ValueError if the prefix or suffix contains a directory component. #150477

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4 changes: 4 additions & 0 deletions Lib/tempfile.py
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Original file line number Diff line number Diff line change
Expand Up @@ -117,11 +117,15 @@ def _sanitize_params(prefix, suffix, dir):
output_type = _infer_return_type(prefix, suffix, dir)
if suffix is None:
suffix = output_type()
if _os.path.dirname(suffix):
raise ValueError("'prefix' or 'suffix' can't contain a directory component")
if prefix is None:
if output_type is str:
prefix = template
else:
prefix = _os.fsencode(template)
if _os.path.dirname(prefix):
raise ValueError("'prefix' or 'suffix' can't contain a directory component")
if dir is None:
if output_type is str:
dir = gettempdir()
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25 changes: 25 additions & 0 deletions Lib/test/test_tempfile.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2054,5 +2054,30 @@ def test_delete_false(self):
self.assertTrue(os.path.exists(working_dir))
shutil.rmtree(working_dir)


class TestPrefixAndSuffix(BaseTestCase):
def test_value_error_if_prefix_or_suffix_contains_directory(self):
MESSAGE = "'prefix' or 'suffix' can't contain a directory component"

if os.altsep is None:
data = (
((os.sep), None),
(os.fsencode(os.sep), tempfile.gettempdirb()),
)
else:
data = (
((os.altsep), None),
(os.fsencode(os.altsep), tempfile.gettempdirb()),
)

for value, directory in data:
with self.subTest((value, directory)):
with self.assertRaisesRegex(ValueError, MESSAGE):
tempfile.mkstemp(dir=directory, prefix=value)
with self.assertRaisesRegex(ValueError, MESSAGE):
os.rmdir(tempfile.mkdtemp(dir=directory, prefix=value))
with self.assertRaisesRegex(ValueError, MESSAGE):
tempfile.NamedTemporaryFile(dir=directory, prefix=value, delete=True)

if __name__ == "__main__":
unittest.main()
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