Move remaining utility functions from _utils.py to _models.py

[RafaelWO]

Summary

Related issue: #3381

This PR moves the following remaining utility functions from _utils.py to _models.py that are only used in _models.py (except to_bytes_or_str):

• is_known_encoding
• parse_header_links
• parse_content_type_charset
• obfuscate_sensitive_headers

Related tests are also moved accordingly, i.e. from tests/test_utils.py to tests/models/test_headers.py.

---

Additionally, this PR fixes the script scripts/lint by using ruff check due to the following error:

error: `ruff <path>` has been removed. Use `ruff check <path>` instead.

Checklist

• I understand that this PR may be closed in case there was no previous discussion. (This doesn't apply to typos!)
• I've added a test for each change that was introduced, and I tried as much as possible to make a single atomic change.
• I've updated the documentation accordingly.

[RafaelWO]

@tomchristie I first overlooked that I should also move some of the related tests. I did this now 🙂

[RafaelWO]

I'm note sure if test_encoded, test_bad_utf_like_encoding, and test_guess_by_bom are related to the moved function is_known_encoding and therefore should be moved into tests related to models?

[lovelydinosaur]

Thanks. ☺️ Prompted one review thought, tho let's get this in.

[lovelydinosaur]

Is now a good time to review this? Eg does flask provide similar behaviour onto its headers data structures? Does Django?

(Possibly too off topic??)

[RafaelWO]

It seems that flask does not obfuscate header values for repr (see werkzeug)

>>> from werkzeug.datastructures import Headers
>>>
>>> head = Headers({"authorization": "s3kr3t"})
>>> head
Headers([('authorization', 's3kr3t')])
>>> repr(head)
"Headers([('authorization', 's3kr3t')])"

Same for Django (see HttpHeaders or ResponseHeaders)

>>> from django.http.response import ResponseHeaders
>>> head = ResponseHeaders({"Authorization": "s3kr3t"})
>>> repr(head)
"{'Authorization': 's3kr3t'}"