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Code Issues Projects Releases Packages Wiki Activity Actions 8

gh-63283: IDNA prefix should be case insensitive (GH-17726)

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Any capitalization of "xn--" should be acceptable for the ACE prefix
(see https://tools.ietf.org/html/rfc3490#section-5).

Co-authored-by: Pepijn de Vos <pepijndevos@gmail.com>
Co-authored-by: Erlend E. Aasland <erlend@python.org>
Co-authored-by: Petr Viktorin <encukou@gmail.com>
This commit is contained in:
Zackery Spytz 2024-03-15 07:38:13 -07:00 • committed by GitHub
parent ce2c996b2f
commit d180b507c4
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3 changed files with 12 additions and 3 deletions
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6
Lib/encodings/idna.py
View file

@ -86,7 +86,7 @@ def ToASCII(label):
raise UnicodeError("label empty or too long")
# Step 5: Check ACE prefix
if label.startswith(sace_prefix):
if label[:4].lower() == sace_prefix:
raise UnicodeError("Label starts with ACE prefix")
# Step 6: Encode with PUNYCODE
@ -129,7 +129,7 @@ def ToUnicode(label):
except UnicodeError:
raise UnicodeError("Invalid character in IDN label")
# Step 3: Check for ACE prefix
if not label.startswith(ace_prefix):
if not label[:4].lower() == ace_prefix:
return str(label, "ascii")
# Step 4: Remove ACE prefix
@ -202,7 +202,7 @@ class Codec(codecs.Codec):
# XXX obviously wrong, see #3232
input = bytes(input)
if ace_prefix not in input:
if ace_prefix not in input.lower():
# Fast path
try:
return input.decode('ascii'), len(input)

7
Lib/test/test_codecs.py
View file

@ -1547,6 +1547,13 @@ class IDNACodecTest(unittest.TestCase):
self.assertEqual(str(b"python.org.", "idna"), "python.org.")
self.assertEqual(str(b"xn--pythn-mua.org", "idna"), "pyth\xf6n.org")
self.assertEqual(str(b"xn--pythn-mua.org.", "idna"), "pyth\xf6n.org.")
self.assertEqual(str(b"XN--pythn-mua.org.", "idna"), "pyth\xf6n.org.")
self.assertEqual(str(b"xN--pythn-mua.org.", "idna"), "pyth\xf6n.org.")
self.assertEqual(str(b"Xn--pythn-mua.org.", "idna"), "pyth\xf6n.org.")
self.assertEqual(str(b"bugs.xn--pythn-mua.org.", "idna"),
"bugs.pyth\xf6n.org.")
self.assertEqual(str(b"bugs.XN--pythn-mua.org.", "idna"),
"bugs.pyth\xf6n.org.")
def test_builtin_encode(self):
self.assertEqual("python.org".encode("idna"), b"python.org")

2
Misc/NEWS.d/next/Library/2024-03-13-15-45-54.gh-issue-63283.OToJnG.rst Normal file
View file

@ -0,0 +1,2 @@
In :mod:`encodings.idna`, any capitalization of the the ACE prefix
(``xn--``) is now acceptable. Patch by Pepijn de Vos and Zackery Spytz.