zip paperclip attachment processor

archive.rb

require 'zip'
# requires gem rubyzip
# usage has_attached_file :attachment, path: path, processors: %i(archive), styles: {original: {format: 'zip', archived_file_name:}}
module Paperclip
  class Archive < Processor
    def make
      tempfile = create_zip_tempfile
      Zip::File.open(tempfile.path, Zip::File::CREATE) do |zip|
        zip.add(archived_file_name, @file.path)
      end
      tempfile
    end

    def archived_file_name
      return @file.original_filename unless options[:archived_file_name]
      options[:archived_file_name] + File.extname(@file.original_filename)
    end

    def create_zip_tempfile
      Tempfile.new(%w(archive .zip)).tap {|tempfile| Zip::OutputStream.open(tempfile) { } }
    end
  end
end