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mimetypes module does not recognize jp2 type #85957

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#126966

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mimetypes module does not recognize jp2 type#85957

#126966

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stdlibStandard Library Python modules in the Lib/ directoryStandard Library Python modules in the Lib/ directorytype-featureA feature request or enhancementA feature request or enhancement

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naro

mannequin

opened

on Sep 15, 2020

Issue body actions

BPO	41791
Nosy	@naro, @iritkatriel

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

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GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2020-09-15.04:31:47.953>
labels = ['type-feature', '3.11']
title = 'mimetypes module does not recognize jp2 type'
updated_at = <Date 2022-01-19.00:38:51.433>
user = 'https://github.com/naro'

bugs.python.org fields:

activity = <Date 2022-01-19.00:38:51.433>
actor = 'adelfino'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = []
creation = <Date 2020-09-15.04:31:47.953>
creator = 'naro'
dependencies = []
files = []
hgrepos = []
issue_num = 41791
keywords = []
message_count = 5.0
messages = ['376927', '377074', '377086', '377113', '410860']
nosy_count = 2.0
nosy_names = ['naro', 'iritkatriel']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue41791'
versions = ['Python 3.11']

Linked PRs

gh-85957: Add missing MIME types for images with RFCs #126966

Activity

naro commented on Sep 15, 2020
naromannequin
on Sep 15, 2020
MannequinAuthor
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Even if jp2 is in the official list of types https://www.iana.org/assignments/media-types/media-types.xhtml it's not recognized by the MimeTypes.guess_type:

>>> from mimetypes import MimeTypes >>> MimeTypes().guess_type('test.jp2') (None, None)

The same example works in Python 3.7 and returns 'image/jp2'
naro
added
type-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error

3.8 (EOL)end of lifeend of life
on Sep 15, 2020
andresdelfino commented on Sep 17, 2020
andresdelfino
on Sep 17, 2020
Contributor
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Hi, Radim!

I've tested with 3.7.8 and got (None, None). I'm curious on how you got that 'image/jp2' output.

It seems jp2 was never supported by looking into the git history of Lib/mimetypes.py.

Would you like to open a PR to support it? :)
naro commented on Sep 18, 2020
naromannequin
on Sep 18, 2020
MannequinAuthor
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Hi Andrés,

tried again and the difference is between 3.7.4 and 3.7.5
The jp2 mimetype is read from /etc/apache2/mime.types (see knownfiles in mimetypes.py) so the mime type does not have to be in the mimetypes.py hardcoded, but in version 3.7.5 it stopped working.

I think it's because of using _types_map_default instead of types_map in some places.

Since jp2 is an official mime type it should be added to the list but I also think we should try to identify the issue with _types_map_default.

Seems to be related to https://bugs.python.org/issue4963

I will have look if I can find out what was changed and why.

Cheers,
Radim
andresdelfino commented on Sep 18, 2020
andresdelfino
on Sep 18, 2020
Contributor
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Nice debugging!
iritkatriel commented on Jan 18, 2022
iritkatriel
on Jan 18, 2022
Member
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It is found by the module-level guess_type but not by the MimeType class's guess_type:

>>> from mimetypes import MimeTypes >>> MimeTypes().guess_type('test.jp2') (None, None) >>> import mimetypes >>> mimetypes.guess_type('test.jp2') ('image/jp2', None) >>>

That difference is the subject of bpo-38656.

What remains to decide here is whether jp2 should be added to the builtin list of mimetypes.
iritkatriel
added
3.11only security fixesonly security fixes

type-featureA feature request or enhancementA feature request or enhancement
and removed
3.8 (EOL)end of lifeend of life

type-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error
on Jan 18, 2022
2 remaining items
ezio-melotti
transferred this issue from on Apr 10, 2022
iritkatriel
added
stdlibStandard Library Python modules in the Lib/ directoryStandard Library Python modules in the Lib/ directory
on Nov 23, 2023
josselinbuils
added 6 commits that reference this issue on Jan 8, 2024
fix(lab-2558): manage mimetypes module issue on Windows
d999ed6
fix(lab-2558): manage mimetypes module issue on Windows
25eb238
fix(lab-2558): manage mimetypes module issue on Windows
9b1d95b
fix(lab-2558): manage mimetypes module issue on Windows
e6e7581
fix(lab-2558): manage mimetypes module issue on Windows
90912c7
fix(lab-2558): manage mimetypes module issue on Windows
0754b47
hugovk commented on Nov 18, 2024
hugovk
on Nov 18, 2024
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Please see PR #126966.
hugovk
added
3.14bugs and security fixesbugs and security fixes
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3.14bugs and security fixesbugs and security fixes
on Nov 18, 2024
hugovk
added a commit that references this issue on Nov 18, 2024
gh-85957: Add missing MIME types for images with RFCs (#126966)
933f21c
hugovk
closed this as completedin #126966 on Nov 18, 2024
ebonnal
added a commit that references this issue on Jan 12, 2025
pythongh-85957: Add missing MIME types for images with RFCs (python#1…
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