snazy commented on code in PR #3496:
URL: https://github.com/apache/polaris/pull/3496#discussion_r2711388701


##########
polaris-core/src/main/java/org/apache/polaris/core/storage/aws/AwsStorageConfigurationInfo.java:
##########
@@ -124,6 +124,13 @@ public URI getStsEndpointUri() {
     return getStsEndpoint() == null ? getInternalEndpointUri() : 
URI.create(getStsEndpoint());
   }
 
+  @JsonIgnore
+  public boolean isAwsS3() {
+    String endpoint = getEndpoint();
+    // AWS S3 if no endpoint is specified or if it uses an amazonaws.com 
endpoint
+    return endpoint == null || endpoint.contains(".amazonaws.com");

Review Comment:
   Checking for `.amazonaws.com` works for the current public regions and 
zones. Technically, it would be better to check for the string only in the host 
part of the endpoint URI though. I do not know the endpoints of the relatively 
new AWS local regions/zones. Whether those are underneath the `amazonaws.com` 
domain. Amazon promised a "EU sovereign cloud", and I think to make it 
completely sovereign, the endpoints would be in a different DNS domain.
   
   OTOH this check wouldn't work for localstack, which supports KMS, or any 
other KMS implementation.
   
   I think, it would be better to gate this check on a different 
condition/setting rather than looking for `.amazonaws.com` in the whole 
endpoint URI.



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