copy_object_to_another_bucket.rb

require 'aws-sdk'

# Copy an AWS S3 object from one bucket to another
class CopyObjectFromOneBucketToAnotherService
  attr_reader :logger, :object_name, :object_to_copy, :destination_bucket
  attr_accessor :debug

  def initialize(options = {})
    create_logger(STDOUT)
    Aws.config.update(
      region: options[:region],
      credentials: Aws::Credentials.new(options[:access_key_id],
                                        options[:secret_access_Key]))
  end

  def copy!(source_bucket, destination_bucket, object, options = {})
    set_aws_objects source_bucket, destination_bucket, object
    proceed options
  end

  def copy(source_bucket, destination_bucket, object, options = {})
    set_aws_objects source_bucket, destination_bucket, object
    proceed options unless @destination_bucket.object(object).exists?
  end

  private

  def set_aws_objects(source_bucket, destination_bucket, object)
    @source_bucket = Aws::S3::Bucket.new(source_bucket)
    @destination_bucket = Aws::S3::Bucket.new(destination_bucket)
    @object_name = object
    @object_to_copy = @source_bucket.object(@object_name)
  end

  def proceed(options)
    if @object_to_copy.exists?
      logger.info "Copying #{@source_bucket.name}/#{@object_name}"
      @object_to_copy.copy_to("#{@destination_bucket.name}/#{@object_name}", options)
      logger.info "Copied to #{@destination_bucket.name}/#{@object_name}"
      return
    end
    logger.info "Not found #{@source_bucket.name}/#{@object_name}"
  end

  def create_logger(output)
    @logger = Logger.new(output).tap do |l|
      l.level = Logger::INFO
    end
  end
end

=begin
Sample:
service = CopyObjectFromOneBucketToAnotherService.new(access_key_id: 'access-key',
                                                      secret_access_Key: 'secret-access-key',
                                                      region: 'region')
service.copy!('source-bucket', 'destination-bucket', 'object', acl: 'public-read')
=end