add check for blob access

[ryanraaschCDC]

No description provided.

[Copilot]

Pull request overview

This PR adds explicit Blob Storage access verification to BlobEndpoint so common Blob operations fail early with clearer, contextualized errors, and updates typing stubs plus introduces a new test module for the access-check behavior.

Changes:

• Add BlobEndpoint.check_blob_access() / BlobEndpoint.verify_blob_access() and call verification before write_blob, read_blobs, read_csv, and get_versions.
• Update generated and template .pyi stubs to include the new methods.
• Add pytest coverage for access-check behavior and for access-check gating on several BlobEndpoint methods.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 2 comments.

File	Description
cfa/dataops/catalog.py	Implements access check/verification and gates key blob operations behind verify_blob_access().
tests/test_blob_access_check.py	Adds tests for the new access-check APIs and for method-level access gating (but currently mocks the wrong call path).
typings/cfa/dataops/catalog.pyi	Adds the new methods to the published typing stubs.
cfa/dataops/stub_templates/catalog.pyi.mako	Adds the new methods to the stub generation template to keep stubs in sync.

Comments suppressed due to low confidence (5)

tests/test_blob_access_check.py:43

• check_blob_access() branches on HttpResponseError (status_code==401) raised from get_container_properties(); patching walk_blobs_in_container and raising a generic Exception with status_code won’t be caught by the intended handler. Mock BlobServiceClient.get_container_properties to raise an HttpResponseError (or subclass) with status_code=401.

    def test_check_blob_access_401_unauthorized(self, blob_endpoint):
        class Err401(Exception):
            status_code = 401

        with patch(

tests/test_blob_access_check.py:57

• Same as the 401 case: the implementation catches HttpResponseError and checks status_code==403. This test currently patches the wrong function and raises an exception type that won’t be handled as expected.

    def test_check_blob_access_403_forbidden(self, blob_endpoint):
        class Err403(Exception):
            status_code = 403

        with patch(

tests/test_blob_access_check.py:71

• check_blob_access() handles missing containers via ResourceNotFoundError from get_container_properties(); patching walk_blobs_in_container and raising a custom Exception won’t hit that branch.

    def test_check_blob_access_resource_not_found(self, blob_endpoint):
        class Err404(Exception):
            status_code = 404

        with patch(

tests/test_blob_access_check.py:87

• The 'Authentication failed' branch is only reached when ClientAuthenticationError is raised by get_container_properties(). Raising a generic Exception will hit the fallback 'Failed to verify access…' branch instead, making this assertion fail.

    def test_check_blob_access_authentication_error(self, blob_endpoint):
        with patch(
            "cfa.dataops.catalog.walk_blobs_in_container",
            side_effect=Exception("credential unavailable"),
        ):
            has_access, message = blob_endpoint.check_blob_access()

tests/test_blob_access_check.py:97

• check_blob_access() does not call walk_blobs_in_container, so this test will currently attempt a real get_container_properties() call. Mock BlobServiceClient.get_container_properties to raise the generic exception so the fallback branch is exercised without network access.

    def test_check_blob_access_generic_exception(self, blob_endpoint):
        with patch(
            "cfa.dataops.catalog.walk_blobs_in_container",
            side_effect=Exception("Something went wrong"),
        ):
            has_access, message = blob_endpoint.check_blob_access()

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