EmailMessage and RFC 2047

[Peter J. Holzer]

On 2019-04-30 17:45:52 +0200, Thomas Jollans wrote:
> On 30/04/2019 13.11, Peter J. Holzer wrote:
> > https://docs.python.org/3.7/library/email.header.html states:
> > 
> > | This module is part of the legacy (Compat32) email API. In the current
> > | API encoding and decoding of headers is handled transparently by the
> > | dictionary-like API of the EmailMessage class.
> > 
> > I understood this to mean that an EmailMessage does decode RFC 2047
> > encoded header fields automatically.
> 
> I have no idea why it's doing what it's doing. The lesson appears to be:
> don't use the compat32 mode unless you have to support Python 3.2 (which
> you don't, because that's ridiculous)
> 
> >>> msg
> 'Subject: =?utf-8?q?=C3=89lys=C3=A9e?=\nContent-Type: text/plain;
> charset="utf-8"\nContent-Transfer-Encoding: 7bit\nMIME-Version:
> 1.0\n\nTEST MESSAGE\n'
> >>> p = email.parser.Parser(email.message.EmailMessage)
> >>> p.parsestr(msg)['Subject']
> '=?utf-8?q?=C3=89lys=C3=A9e?='
> >>> p = email.parser.Parser(email.message.EmailMessage,
> policy=email.policy.default)
> >>> p.parsestr(msg)['Subject']
> 'Élysée'
> >>>

O thanks. Since email.message.EmailMessage was only introduced in 3.6
(and therefore can't be compatible to 3.2) and the default policy for it
is "default") I didn't expect email.parser.Parser to override that
(although
https://docs.python.org/3/library/email.parser.html#email.parser.BytesFeedParser
clearly says "policy=policy.compat32" - silly me)

        hp

-- 
   _  | Peter J. Holzer    | we build much bigger, better disasters now
|_|_) |                    | because we have much more sophisticated
| |   | hjp at hjp.at         | management tools.
__/   | http://www.hjp.at/ | -- Ross Anderson <https://www.edge.org/>
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