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gh-77749: Fix inconsistent behavior of non-ASCII handling in EmailPolicy.fold() (GH-6986)

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It now always encodes non-ASCII characters in headers if utf8 is false.

Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>
This commit is contained in:
Rito Takeuchi 2024-01-27 00:19:41 +09:00 • committed by GitHub
parent 0bd8297a22
commit 504334c7be
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3 changed files with 27 additions and 1 deletions
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9
Lib/email/policy.py
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@ -210,8 +210,15 @@ class EmailPolicy(Policy):
self.refold_source == 'long' and
(lines and len(lines[0])+len(name)+2 > maxlen or
any(len(x) > maxlen for x in lines[1:])))
if refold or refold_binary and _has_surrogates(value):
if not refold:
if not self.utf8:
refold = not value.isascii()
elif refold_binary:
refold = _has_surrogates(value)
if refold:
return self.header_factory(name, ''.join(lines)).fold(policy=self)
return name + ': ' + self.linesep.join(lines) + self.linesep