Add mUTF-7 codec (UTF-7 modified for IMAP)

[jcea]

BPO	22598
Nosy	@jcea, @pitrou, @ezio-melotti, @vadmium, @serhiy-storchaka, @raulcd, @lcnittl
Dependencies	bpo-24848: Warts in UTF-7 error handling

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

Show more details

GitHub fields:

assignee = 'https://github.com/serhiy-storchaka'
closed_at = None
created_at = <Date 2014-10-10.10:24:17.153>
labels = ['type-feature', 'expert-unicode']
title = 'Add mUTF-7 codec (UTF-7 modified for IMAP)'
updated_at = <Date 2020-05-13.15:30:22.977>
user = 'https://github.com/jcea'

bugs.python.org fields:

activity = <Date 2020-05-13.15:30:22.977>
actor = 'lcnittl'
assignee = 'serhiy.storchaka'
closed = False
closed_date = None
closer = None
components = ['Unicode']
creation = <Date 2014-10-10.10:24:17.153>
creator = 'jcea'
dependencies = ['24848']
files = []
hgrepos = []
issue_num = 22598
keywords = []
message_count = 8.0
messages = ['228979', '229001', '229103', '247159', '248174', '248178', '365819', '368785']
nosy_count = 8.0
nosy_names = ['jcea', 'pitrou', 'ezio.melotti', 'martin.panter', 'serhiy.storchaka', 'raulcd', 'juris', 'lcnittl']
pr_nums = []
priority = 'normal'
resolution = None
stage = 'needs patch'
status = 'open'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue22598'
versions = ['Python 3.6']

Linked PRs

• gh-66788: Add the utf-7-imap codec #153149

[jcea]

Looks like there is consensus to add "mUTF-7" or "imap4 UTF-7" to the codec module for Python 3.5. Details in https://mail.python.org/pipermail/python- dev/2014-October/136601.html

[serhiy-storchaka]

Could you please add a link to RFC?

[pitrou]

See http://tools.ietf.org/html/rfc3501#section-5.1.3
Note how detailed the specification of "modified utf-7" is :-)

[vadmium]

Not sure on the scope of this, but if someone wants to implement the incremental codec API, be aware that the existing UTF-7 codec, PyUnicode_DecodeUTF7Stateful() API, etc, does not actually support this properly. See bpo-20132, e.g. the test cases in <https://bugs.python.org/issue20132#msg232850\>. I recommend against impementing an incremental or stream codec based only on a stateless codec.

[jcea]

ping.

[serhiy-storchaka]

I take this.

[juris]

Would be good to have solution for this out-of-box in Python3. Any news?

[lcnittl]

I just stumbled over this too. Very eager to know if there are any news on the state of out-of-box support for the "mUTF-7" codec.