Skip to content

Correctly fold unknown-8bit originating from encoded words. #142517

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Open
bitdancer wants to merge 2 commits into
base: main
Choose a base branch
from
Open

Correctly fold unknown-8bit originating from encoded words. #142517

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
2 commits
Select commit Hold shift + click to select a range
ee40a0c
Correctly fold unknown-8bit originating from encoded words.
bitdancer Dec 10, 2025
1bba134
News entry.
bitdancer Dec 10, 2025
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
2 changes: 1 addition & 1 deletion Lib/email/_encoded_words.py
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -219,7 +219,7 @@ def encode(string, charset='utf-8', encoding=None, lang=''):

"""
if charset == 'unknown-8bit':
bstring = string.encode('ascii', 'surrogateescape')
bstring = string.encode('utf-8', 'surrogateescape')
else:
bstring = string.encode(charset)
if encoding is None:
Expand Down
8 changes: 8 additions & 0 deletions Lib/test/test_email/test__header_value_parser.py
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -3265,5 +3265,13 @@ def test_fold_unfoldable_element_stealing_whitespace(self):
token = parser.get_address_list(text)[0]
self._test(token, expected, policy=policy)

def test_encoded_word_with_undecodable_bytes(self):
self._test(parser.get_address_list(
' =?utf-8?Q?=E5=AE=A2=E6=88=B6=E6=AD=A3=E8=A6=8F=E4=BA=A4=E7?='
)[0],
' =?unknown-8bit?b?5a6i5oi25q2j6KaP5Lqk5w==?=\n',
)


if __name__ == '__main__':
unittest.main()
4 changes: 4 additions & 0 deletions Misc/NEWS.d/next/Library/2025-12-10-10-00-06.gh-issue-142517.fG4hbe.rst
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -0,0 +1,4 @@
The non-``compat32`` :mod:`email` policies now correctly handle refolding
encoded words that contain bytes that can not be decoded in their specified
character set. Previously this resulting in an encoding exception during
folding.
Loading