class Aws::S3::PresignedPost

def bucket_url
  # Taken from Aws::S3::Endpoints module
  params = Aws::S3::EndpointParameters.new(
    bucket: @bucket_name,
    region: @bucket_region,
    accelerate: @accelerate,
    use_global_endpoint: true
  )
  endpoint = Aws::S3::EndpointProvider.new.resolve_endpoint(params)
  endpoint.url
end