ashb commented on code in PR #29623:
URL: https://github.com/apache/airflow/pull/29623#discussion_r1113244622


##########
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:
   Speaking to strictly a user feature point of view: Supporting this feature 
in Airflow connections that work with any AWS operator is a huge win. So the 
DAG approach you have right now isn't really viable, not for users who aren't 
proficient in Python -- which lets not forget is many Airflow users.
   
   So lets state my ground truth: Being able to configure an AWS connection 
exclusively through the Airflow UI to use a web identity token, that can then 
be used with all existing AWS operators, is a good feature and one we will 
accept.
   
   We can talk about implementation details, but "just write a python operator 
do to it" is not an answer to this problem.
   



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