New submission from Peter Wullinger <[email protected]>:
The documentation for email.generator.{Bytes,}Generator do not mention that
Generator._handle_multipart_signed() exists and disables header folding for
subparts of multipart/signed.
This may cause some frustration, since, as implemented, rendering a message
part enclosed in multipart/signed causes headers to fold differently than
rendering the respective message part individually:
>>> text = MIMEText('', 'plain', 'utf-8')
>>> text['X-X'] = 'a b c d e f g h i j k l m n o p q r s t u v w x y z a b c d
>>> e f g h i j k l m n o p'
>>> print(text.as_string())
Content-Type: text/plain; charset="utf-8"
MIME-Version: 1.0
Content-Transfer-Encoding: base64
X-X: a b c d e f g h i j k l m n o p q r s t u v w x y z a b c d e f g h i j k
l m n o p
>>> signed = MIMEMultipart('signed', filename='smime.p7s')
>>> signed.attach(text)
>>> print(signed.as_string())
Content-Type: multipart/signed; filename="smime.p7s";
boundary="===============8046244967080646804=="
MIME-Version: 1.0
--===============8046244967080646804==
Content-Type: text/plain; charset="utf-8"
MIME-Version: 1.0
Content-Transfer-Encoding: base64
X-X: a b c d e f g h i j k l m n o p q r s t u v w x y z a b c d e f g h i j k
l m n o p
--===============8046244967080646804==--
This breaks SMIME signatures when using the partial render to generate the
signature.
A possible workaround is to set maxheaderlen=0 for the partial render, which is
the same as what Generator._handle_multipart_signed() does, but to do that one
needs to know about the special processing.
Attached is a suggestion at a documentation fix that remedies this problem at
least for the online docs.
----------
components: email
files: email-generator-multipart-signed-docs.patch
keywords: patch
messages: 305127
nosy: barry, dhke, r.david.murray
priority: normal
severity: normal
status: open
title: docs for email.generator are missing a comment on special
multipart/signed handling
type: enhancement
versions: Python 2.7, Python 3.4, Python 3.5, Python 3.6, Python 3.7, Python 3.8
Added file:
https://bugs.python.org/file47243/email-generator-multipart-signed-docs.patch
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<https://bugs.python.org/issue31887>
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