secure_name_first.rb

class Export::SecureName
  attr_accessor :name, :extension

  def initialize(name, extension = nil)
    self.name      = name
    self.extension = extension
  end

  def get
    sanitize(sliced_name)
  end

  private
    def sanitize(name)
      CarrierWave::SanitizedFile.new(name).filename
    end

    def sliced_name
      if extension
        sliced_basename + extension
      else
        name.slice(255)
      end
    end

    def sliced_basename
      File.basename(name, extension).slice(255 - extension.length)
    end
end