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python: open messages in binary mode

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currently, notmuch's get_message_parts() opens the file in text mode and passes
the file object to email.message_from_file(fp). In case the email contains
UTF-8 characters, reading might fail inside email.parser with the following exception:

  File "/usr/lib/python3.6/site-packages/notmuch/message.py", line 591, in get_message_parts
    email_msg = email.message_from_binary_file(fp)
  File "/usr/lib/python3.6/email/__init__.py", line 62, in message_from_binary_file
    return BytesParser(*args, **kws).parse(fp)
  File "/usr/lib/python3.6/email/parser.py", line 110, in parse
    return self.parser.parse(fp, headersonly)
  File "/usr/lib/python3.6/email/parser.py", line 54, in parse
    data = fp.read(8192)
  File "/usr/lib/python3.6/codecs.py", line 321, in decode
    (result, consumed) = self._buffer_decode(data, self.errors, final)
UnicodeDecodeError: 'utf-8' codec can't decode byte 0xe4 in position 1865: invalid continuation byte

To fix this, read file in binary mode and pass to
email.message_from_binary_file(fp).

Unfortunately, Python 2 doesn't support
email.message_from_binary_file(fp), so keep using
email.message_from_file(fp) there.

Signed-off-by: Florian Klink <flokli@flokli.de>
This commit is contained in:
Florian Klink 2017-09-24 14:36:11 +02:00 committed by David Bremner
parent 073188e690
commit 91fe20cd90
1 changed files with 6 additions and 2 deletions
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8
bindings/python/notmuch/message.py
View file

@ -41,6 +41,7 @@ from .tag import Tags
from .filenames import Filenames
import email
import sys
class Message(Python3StringMixIn):
@ -587,8 +588,11 @@ class Message(Python3StringMixIn):
def get_message_parts(self):
"""Output like notmuch show"""
fp = open(self.get_filename())
email_msg = email.message_from_file(fp)
fp = open(self.get_filename(), 'rb')
if sys.version_info[0] < 3:
email_msg = email.message_from_file(fp)
else:
email_msg = email.message_from_binary_file(fp)
fp.close()
out = []