Adding Deprecation Warning For hash_type

[ericspod]

Description

Addresses missing deprecation warnings about the changing default value of hash_type in #9088. The solution in #9124 isn't ideal since the warning comes up in too many scenarios, the objective is to raise the warning when no value is passed explicitly to let users know to change things, and at the same time not breaking backwards compatibility. The behaviour defaults to using md5 as the hash_type, perhaps it's more secure for this to be sha256 despite compatibility breaking?

Types of changes

• Non-breaking change (fix or new feature that would not break existing functionality).
• Breaking change (fix or new feature that would cause existing functionality to change).
• New tests added to cover the changes.
• Integration tests passed locally by running ./runtests.sh -f -u --net --coverage.
• Quick tests passed locally by running ./runtests.sh --quick --unittests --disttests.
• In-line docstrings updated.
• Documentation updated, tested make html command in the docs/ folder.

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📒 Files selected for processing (1)

• monai/apps/utils.py

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• monai/apps/utils.py

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📝 Walkthrough

Walkthrough

The change sets hash_type to None by default in download_url, extractall, and download_and_extract. When hash_val is provided without hash_type, download_url and extractall emit a deprecation warning and use SHA-256. Tests verify both warning paths. Documentation records the default change.

Priority: ➖ Normal

Estimated code review effort: 2 (Simple) | ~12 minutes

Merge Risk: ⚪ Minimal · up to bffc3

The change adds deprecation warnings for omitted hash types while preserving the stated compatibility behavior; no concrete merge-blocking risk remains.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly identifies the main change: adding a deprecation warning for hash_type.
Description check	✅ Passed	The description explains the change and includes the required Description and Types of changes sections. The checklist does not mark the added tests or updated docstrings, and the issue placeholder re…
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 7 functions across 2 files.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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Actionable comments posted: 1

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• 🪄 Fix CodeRabbit comments on this PR

🤖 Prompt to fix review comments

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Inline comments:
In `@monai/apps/utils.py`:
- Line 255: Update the deprecation warning messages in both functions that
default hash_type to "sha256" so they state “Defaulting to sha256 checking”
instead of MD5, and update both corresponding tests to assert the SHA-256
wording.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Repository: Project-MONAI/MONAI/.coderabbit.yaml

Review profile: CHILL

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Run ID: 020ca228-c8f3-43ac-b0c8-ea57e080eb57

📥 Commits

Reviewing files that changed from the base of the PR and between c7e5ea0 and 89e359b.

📒 Files selected for processing (2)

• monai/apps/utils.py
• tests/apps/test_download_and_extract.py

Included review availability: Your plan provides up to 8 included reviews per hour; 7 remain after this review.