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[3.10] bpo-20392: Fix inconsistency with uppercase file extensions in mimetypes.guess_type (GH-30229) #31904

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Merged
merged 1 commit into from
Mar 15, 2022
Merged

[3.10] bpo-20392: Fix inconsistency with uppercase file extensions in mimetypes.guess_type (GH-30229) #31904

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10 changes: 4 additions & 6 deletions Lib/mimetypes.py
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Original file line number Diff line number Diff line change
Expand Up @@ -141,25 +141,23 @@ def guess_type(self, url, strict=True):
type = 'text/plain'
return type, None # never compressed, so encoding is None
base, ext = posixpath.splitext(url)
while ext in self.suffix_map:
base, ext = posixpath.splitext(base + self.suffix_map[ext])
while (ext_lower := ext.lower()) in self.suffix_map:
base, ext = posixpath.splitext(base + self.suffix_map[ext_lower])
# encodings_map is case sensitive
if ext in self.encodings_map:
encoding = self.encodings_map[ext]
base, ext = posixpath.splitext(base)
else:
encoding = None
ext = ext.lower()
types_map = self.types_map[True]
if ext in types_map:
return types_map[ext], encoding
elif ext.lower() in types_map:
return types_map[ext.lower()], encoding
elif strict:
return None, encoding
types_map = self.types_map[False]
if ext in types_map:
return types_map[ext], encoding
elif ext.lower() in types_map:
return types_map[ext.lower()], encoding
else:
return None, encoding

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7 changes: 7 additions & 0 deletions Lib/test/test_mimetypes.py
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Expand Up @@ -33,6 +33,13 @@ def tearDownModule():
class MimeTypesTestCase(unittest.TestCase):
def setUp(self):
self.db = mimetypes.MimeTypes()

def test_case_sensitivity(self):
eq = self.assertEqual
eq(self.db.guess_type("foobar.HTML"), self.db.guess_type("foobar.html"))
eq(self.db.guess_type("foobar.TGZ"), self.db.guess_type("foobar.tgz"))
eq(self.db.guess_type("foobar.tar.Z"), ("application/x-tar", "compress"))
eq(self.db.guess_type("foobar.tar.z"), (None, None))

def test_default_data(self):
eq = self.assertEqual
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1 change: 1 addition & 0 deletions Misc/NEWS.d/next/Library/2021-12-22-12-02-27.bpo-20392.CLAFIp.rst
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@@ -0,0 +1 @@
Fix inconsistency with uppercase file extensions in :meth:`MimeTypes.guess_type`. Patch by Kumar Aditya.