[issue43818] Email does not apply policy to multipart messages with defects

[Martin Dengler]

Martin Dengler  added the comment:

Possible related to https://github.com/python/cpython/pull/32137 and 
https://bugs.python.org/issue43323

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[issue43818] Email does not apply policy to multipart messages with defects

[Martin Dengler]

Change by Martin Dengler :


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nosy: +mdengler

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[issue43818] Email does not apply policy to multipart messages with defects

[Joseph Ishac]

New submission from Joseph Ishac :

I have noticed an issue (Python 3.8.5) where an email can be read in as bytes, 
but will not be returned as such with the as_bytes() call if the message is 
multipart, has a boundary which is not properly quoted, and the message has 
non-ascii text. It seems to be a result of how multipart messages are treated 
if the NoBoundaryInMultipartDefect is encountered [See Test #1].

I would argue that attempting to output the test message in the sample script 
with an 8bit, utf-8 enabled policy should return the original bytes as the 8bit 
policy should be applied to the "body" portion (any part after the null lines) 
of the email (as would be the case if it were not multipart) [See Test #4]

Currently it appears that the entire message is treated as headers, applying 
the strict 7bit, ascii requirement to the entire contents of the message. 
Furthermore, the msg.preamble is None.

I am also uncertain that attempting to leverage the handle_defect hooks would 
be helpful as correcting the boundary doesn't seem to work unless you re-parse 
the message [See Tests #2 and #3]

So the requested change would be to apply the encoding output policy to all 
portions of a message after the null line ending the headers.

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components: email
files: email.multipart.test.py
messages: 390897
nosy: barry, jishac, r.david.murray
priority: normal
severity: normal
status: open
title: Email does not apply policy to multipart messages with defects
versions: Python 3.8
Added file: https://bugs.python.org/file49955/email.multipart.test.py

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