class Aws::Plugins::GlacierChecksums::Handler

def populate_checksum_headers(context)
  compute_checksums(context.http_request.body) do |hash, tree_hash|
    context.http_request.headers[HASH] = hash
    context.http_request.headers[TREE_HASH] = tree_hash.digest
    context[:tree_hash] = tree_hash
  end
end