pavibhai commented on code in PR #1424:
URL: https://github.com/apache/polaris/pull/1424#discussion_r2243653830


##########
polaris-core/src/main/java/org/apache/polaris/core/storage/aws/AwsCredentialsStorageIntegration.java:
##########
@@ -227,6 +261,24 @@ private String getArnPrefixFor(String roleArn) {
     }
   }
 
+  private static String getKMSArnPrefix(String roleArn) {
+    if (roleArn.contains("aws-cn")) {
+      return "arn:aws-cn:kms:";
+    } else if (roleArn.contains("aws-us-gov")) {
+      return "arn:aws-us-gov:kms:";
+    } else {
+      return "arn:aws:kms:";
+    }
+  }
+
+  private static String getS3Endpoint(String roleArn, String region) {
+    if (roleArn.contains("aws-cn")) {

Review Comment:
   We could do the following instead:
   
   ```java
   Region regionObj = Region.of(region);
   String.format("s3.%s.%s", region.id(), 
region.metadata().partition().dnsSuffix()))
   ```
   
   Or better (once the aws-cn-global bug is resolved)
   
   ```java
   S3Client.serviceMetadata().endpointFor(region)
   ```



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