fix: ADC with impersonated workforce pools #877
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While service account impersonation is uncommonly used with workforce pool external credentials, there is a bug where the following commands raise exceptions when impersonated workforce pools are used: - `google.auth.default()` - `google.auth.load_credentials_from_file()` The issue is due to `google.auth.aws.Credentials` not supporting the `workforce_pool_user_project` argument in the constructor, unlike `google.auth.identity_pool.Credentials`. This was indirectly passed here: https://github.com/googleapis/google-auth-library-python/blob/a37ff00d7afd6c7aac2d0fab29e05708bbc068be/google/auth/external_account.py#L395 Causing a TypeError to be raised (we only catch ValueError). Updated the credential determination logic to explicitly check the subject token type. This is a more reliable indicator instead of a try/catch. Increased unit test coverage in tests/test__default.py to cover these credentials.
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Oct 1, 2021
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While service account impersonation is uncommonly used with workforce
pool external credentials, there is a bug where the following commands
raise exceptions when impersonated workforce pools are used:
google.auth.default()google.auth.load_credentials_from_file()The issue is due to
google.auth.aws.Credentialsnot supporting theworkforce_pool_user_projectargument in the constructor, unlikegoogle.auth.identity_pool.Credentials.This was indirectly passed here:
google-auth-library-python/google/auth/external_account.py
Line 395 in a37ff00
Causing a TypeError to be raised (we only catch ValueError).
Updated the credential determination logic to explicitly check the
subject token type. This is a more reliable indicator instead of a
try/catch.
Increased unit test coverage in tests/test__default.py to cover these
credentials.