Get the policy for an Amazon S3 bucket using an Amazon SDK

bool AwsDoc::S3::GetBucketPolicy(const Aws::String &bucketName,
                                 const Aws::Client::ClientConfiguration &clientConfig) {
    Aws::S3::S3Client s3_client(clientConfig);

    Aws::S3::Model::GetBucketPolicyRequest request;
    request.SetBucket(bucketName);

    Aws::S3::Model::GetBucketPolicyOutcome outcome =
            s3_client.GetBucketPolicy(request);

    if (!outcome.IsSuccess()) {
        const Aws::S3::S3Error &err = outcome.GetError();
        std::cerr << "Error: GetBucketPolicy: "
                  << err.GetExceptionName() << ": " << err.GetMessage() << std::endl;
    }
    else {
        Aws::StringStream policy_stream;
        Aws::String line;

        outcome.GetResult().GetPolicy() >> line;
        policy_stream << line;

        std::cout << "Retrieve the policy for bucket '" << bucketName << "':\n\n" <<
                  policy_stream.str() << std::endl;
    }

    return outcome.IsSuccess();
}

    public static String getPolicy(S3Client s3, String bucketName) {

        String policyText;
        System.out.format("Getting policy for bucket: \"%s\"\n\n", bucketName);
        GetBucketPolicyRequest policyReq = GetBucketPolicyRequest.builder()
            .bucket(bucketName)
            .build();

        try {
            GetBucketPolicyResponse policyRes = s3.getBucketPolicy(policyReq);
            policyText = policyRes.policy();
            return policyText;

        } catch (S3Exception e) {
            System.err.println(e.awsErrorDetails().errorMessage());
            System.exit(1);
        }

        return "";
    }

Get the bucket policy.

import { GetBucketPolicyCommand, S3Client } from "@aws-sdk/client-s3";

const client = new S3Client({});

export const main = async () => {
  const command = new GetBucketPolicyCommand({
    Bucket: "test-bucket",
  });

  try {
    const { Policy } = await client.send(command);
    console.log(JSON.parse(Policy));
  } catch (err) {
    console.error(err);
  }
};

suspend fun getPolicy(bucketName: String): String? {

    println("Getting policy for bucket $bucketName")

    val request = GetBucketPolicyRequest {
        bucket = bucketName
    }

    S3Client { region = "us-east-1" }.use { s3 ->
        val policyRes = s3.getBucketPolicy(request)
        return policyRes.policy
    }
}

class BucketWrapper:
    """Encapsulates S3 bucket actions."""
    def __init__(self, bucket):
        """
        :param bucket: A Boto3 Bucket resource. This is a high-level resource in Boto3
                       that wraps bucket actions in a class-like structure.
        """
        self.bucket = bucket
        self.name = bucket.name

    def get_policy(self):
        """
        Get the security policy of the bucket.

        :return: The security policy of the specified bucket, in JSON format.
        """
        try:
            policy = self.bucket.Policy()
            logger.info("Got policy %s for bucket '%s'.", policy.policy, self.bucket.name)
        except ClientError:
            logger.exception("Couldn't get policy for bucket '%s'.", self.bucket.name)
            raise
        else:
            return json.loads(policy.policy)

# Wraps an Amazon S3 bucket policy.
class BucketPolicyWrapper
  attr_reader :bucket_policy

  # @param bucket_policy [Aws::S3::BucketPolicy] A bucket policy object configured with an existing bucket.
  def initialize(bucket_policy)
    @bucket_policy = bucket_policy
  end

  # Gets the policy of a bucket.
  #
  # @return [Aws::S3::GetBucketPolicyOutput, nil] The current bucket policy.
  def get_policy
    policy = @bucket_policy.data.policy
    policy.respond_to?(:read) ? policy.read : policy
  rescue Aws::Errors::ServiceError => e
    puts "Couldn't get the policy for #{@bucket_policy.bucket.name}. Here's why: #{e.message}"
    nil
  end

end