Use GetBucketPolicy with an AWS SDK

Get the policy of a directory bucket.

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import software.amazon.awssdk.regions.Region;
import software.amazon.awssdk.services.s3.S3Client;
import software.amazon.awssdk.services.s3.model.GetBucketPolicyRequest;
import software.amazon.awssdk.services.s3.model.GetBucketPolicyResponse;
import software.amazon.awssdk.services.s3.model.S3Exception;

import static com.example.s3.util.S3DirectoryBucketUtils.createDirectoryBucket;
import static com.example.s3.util.S3DirectoryBucketUtils.createS3Client;
import static com.example.s3.util.S3DirectoryBucketUtils.deleteDirectoryBucket;
import static com.example.s3.util.S3DirectoryBucketUtils.getAwsAccountId;
import static com.example.s3.util.S3DirectoryBucketUtils.putDirectoryBucketPolicy;

    /**
     * Retrieves the bucket policy for the specified S3 directory bucket.
     *
     * @param s3Client   The S3 client used to interact with S3
     * @param bucketName The name of the directory bucket
     * @return The bucket policy text
     */
    public static String getDirectoryBucketPolicy(S3Client s3Client, String bucketName) {
        logger.info("Getting policy for bucket: {}", bucketName);

        try {
            // Create a GetBucketPolicyRequest
            GetBucketPolicyRequest policyReq = GetBucketPolicyRequest.builder()
                    .bucket(bucketName)
                    .build();

            // Retrieve the bucket policy
            GetBucketPolicyResponse response = s3Client.getBucketPolicy(policyReq);

            // Print and return the policy text
            String policyText = response.policy();
            logger.info("Bucket policy: {}", policyText);
            return policyText;

        } catch (S3Exception e) {
            logger.error("Failed to get bucket policy: {} - Error code: {}", e.awsErrorDetails().errorMessage(),
                    e.awsErrorDetails().errorCode(), e);
            throw e;
        }
    }