ashb commented on code in PR #29623:
URL: https://github.com/apache/airflow/pull/29623#discussion_r1112132611


##########
airflow/providers/amazon/aws/hooks/base_aws.py:
##########
@@ -311,20 +311,32 @@ def _get_web_identity_credential_fetcher(
     ) -> botocore.credentials.AssumeRoleWithWebIdentityCredentialFetcher:
         base_session = self.basic_session._session or 
botocore.session.get_session()
         client_creator = base_session.create_client
-        federation = 
self.extra_config.get("assume_role_with_web_identity_federation")
-        if federation == "google":
-            web_identity_token_loader = 
self._get_google_identity_token_loader()
-        else:
-            raise AirflowException(
-                f'Unsupported federation: {federation}. Currently "google" 
only are supported.'
-            )
+        federation = 
str(self.extra_config.get("assume_role_with_web_identity_federation"))
+
+        web_identity_token_loader = {
+            "file": self._get_file_token_loader,
+            "google": self._get_google_identity_token_loader,
+        }.get(federation, lambda: None)()
+
+        if not web_identity_token_loader:

Review Comment:
   Since you have a default of `lambda: None` this is never going to be hit.



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