pgagnon commented on code in PR #29623:
URL: https://github.com/apache/airflow/pull/29623#discussion_r1112002541


##########
airflow/providers/amazon/aws/hooks/base_aws.py:
##########
@@ -312,19 +312,35 @@ def _get_web_identity_credential_fetcher(
         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.'
-            )
+
+        web_identity_token_loader = (
+            {
+                "file": self._get_file_token_loader,
+                "google": self._get_google_identity_token_loader,
+            }.get(federation)()
+            if type(federation) == str
+            else None
+        )

Review Comment:
   Just to expand, if boto allowed passing `web_identity_token_file`, 
`role_arn`, and `role_session_name` as kwargs, then I would agree with you that 
nothing needs to be implemented, but AFAIK, that is not the case; the only 
options available are (1) environment variables and (2) aws 
configuration/shared credentials file, both of which are external and more or 
less static configuration mechanisms.



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