New submission from Joel Hillacre:
Found an issue in email.policy.SMTP.fold on "Content-Disposition" headers for
long filenames with spaces. Managed to simply the issue to a test case as
follows:
>>> from email.policy import SMTP; SMTP.fold('Content-Disposition',
>>> 'attachment; filename="{}"'.format('1234 67890' + '1234567890' * 6))
Below are the tracebacks various python versions produces for this code. I
think that the difference between python 3.5 - 3.6 and 3.7 are related to the
fix in bpo-30532.
Python 3.6.1 (default, Apr 7 2017, 09:32:32) & Python 3.5.3 (default, Jan 17
2017, 14:34:36)
Traceback (most recent call last):
File "<string>", line 1, in <module>
File "/usr/lib64/python3.6/email/policy.py", line 183, in fold
return self._fold(name, value, refold_binary=True)
File "/usr/lib64/python3.6/email/policy.py", line 213, in _fold
return self.header_factory(name, ''.join(lines)).fold(policy=self)
File "/usr/lib64/python3.6/email/headerregistry.py", line 255, in fold
return header.fold(policy=policy)
File "/usr/lib64/python3.6/email/_header_value_parser.py", line 300, in fold
self._fold(folded)
File "/usr/lib64/python3.6/email/_header_value_parser.py", line 1228, in _fold
rest._fold(folded)
File "/usr/lib64/python3.6/email/_header_value_parser.py", line 347, in _fold
if folded.append_if_fits(part):
File "/usr/lib64/python3.6/email/_header_value_parser.py", line 149, in
append_if_fits
token._fold(self)
File "/usr/lib64/python3.6/email/_header_value_parser.py", line 338, in _fold
if folded.append_if_fits(part, tstr):
... last 4 lines repeated 482 more times ...
File "/usr/lib64/python3.6/email/_header_value_parser.py", line 149, in
append_if_fits
token._fold(self)
File "/usr/lib64/python3.6/email/_header_value_parser.py", line 325, in _fold
tstr = str(part)
File "/usr/lib64/python3.6/email/_header_value_parser.py", line 196, in
__str__
return ''.join(str(x) for x in self)
File "/usr/lib64/python3.6/email/_header_value_parser.py", line 196, in
<genexpr>
return ''.join(str(x) for x in self)
File "/usr/lib64/python3.6/email/_header_value_parser.py", line 196, in
__str__
return ''.join(str(x) for x in self)
File "/usr/lib64/python3.6/email/_header_value_parser.py", line 196, in
<genexpr>
return ''.join(str(x) for x in self)
File "/usr/lib64/python3.6/email/_header_value_parser.py", line 196, in
__str__
return ''.join(str(x) for x in self)
File "/usr/lib64/python3.6/email/_header_value_parser.py", line 196, in
<genexpr>
return ''.join(str(x) for x in self)
File "/usr/lib64/python3.6/email/_header_value_parser.py", line 633, in
__str__
return quote_string(''.join(str(x) for x in self))
File "/usr/lib64/python3.6/email/_header_value_parser.py", line 633, in
<genexpr>
return quote_string(''.join(str(x) for x in self))
RecursionError: maximum recursion depth exceeded while getting the str of an
object
Python 3.7.0a0 (heads/master:e613e6add5, Jun 27 2017, 12:17:18)
Traceback (most recent call last):
File "<string>", line 1, in <module>
File "/home/joel/PycharmProjects/cpython/Lib/email/policy.py", line 183, in
fold
return self._fold(name, value, refold_binary=True)
File "/home/joel/PycharmProjects/cpython/Lib/email/policy.py", line 213, in
_fold
return self.header_factory(name, ''.join(lines)).fold(policy=self)
File "/home/joel/PycharmProjects/cpython/Lib/email/headerregistry.py", line
255, in fold
return header.fold(policy=policy)
File "/home/joel/PycharmProjects/cpython/Lib/email/_header_value_parser.py",
line 300, in fold
self._fold(folded)
File "/home/joel/PycharmProjects/cpython/Lib/email/_header_value_parser.py",
line 1226, in _fold
rest._fold(folded)
File "/home/joel/PycharmProjects/cpython/Lib/email/_header_value_parser.py",
line 345, in _fold
if folded.append_if_fits(part):
File "/home/joel/PycharmProjects/cpython/Lib/email/_header_value_parser.py",
line 145, in append_if_fits
ws = token.pop_leading_fws()
File "/home/joel/PycharmProjects/cpython/Lib/email/_header_value_parser.py",
line 272, in pop_leading_fws
return self[0].pop_leading_fws()
File "/home/joel/PycharmProjects/cpython/Lib/email/_header_value_parser.py",
line 272, in pop_leading_fws
return self[0].pop_leading_fws()
File "/home/joel/PycharmProjects/cpython/Lib/email/_header_value_parser.py",
line 270, in pop_leading_fws
if self[0].token_type == 'fws':
IndexError: list index out of range
Note that the following example without a space does not cause a traceback:
Python 3.7.0a0 (heads/master:e613e6add5, Jun 27 2017, 12:17:18)
>>> from email.policy import SMTP; SMTP.fold('Content-Disposition',
>>> 'attachment; filename="{}"'.format('1234567890' + '1234567890' * 6))
'Content-Disposition: attachment;\r\n
filename="1234567890123456789012345678901234567890123456789012345678901234567890"\r\n'
----------
components: email
messages: 297072
nosy: barry, jhillacre, r.david.murray
priority: normal
severity: normal
status: open
title: email.policy.SMTP.fold() issue with long filenames with spaces
versions: Python 3.5, Python 3.6, Python 3.7
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Python tracker <[email protected]>
<http://bugs.python.org/issue30788>
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