Downloading files from S3, zipping them and uploading them to S3 with carrierwave

zip_generation.rb

  # METHOD 1: using output stream
  def generate_kit_banco_zip(kit_banco)
    s3 = Aws::S3::Resource.new
    bucket = s3.bucket(ENV['FOG_DIRECTORY'])

    compressed_filestream = Zip::OutputStream.write_buffer do |zos|
      file = kit_banco.social_contract_file.file
      file_obj = bucket.object(file.path)
      zos.put_next_entry("ContratoSocial.#{file.extension}")
      zos.print(file_obj.get.body.read)
    end

    compressed_filestream.rewind
    temp_zip = Tempfile.new(['kit_documento', '.zip'])
    temp_zip.binmode
    temp_zip.write(compressed_filestream.read)

    kit_banco.zipped_kit_file = File.open(temp_zip)
    kit_banco.save!
  ensure
    temp_zip.close
    temp_zip.unlink
  end

  # METHOD 2
  def generate_kit_banco_zip2(kit_banco)
    zip_path = Rails.root.join('tmp', 'uploads', SecureRandom.hex(10).to_s + '.zip')

    Zip::File.open(zip_path, Zip::File::CREATE) do |zipfile|
      file = kit_banco.social_contract_file.file

      contract_file = Rails.root.join('tmp', 'uploads', SecureRandom.hex(10).to_s + ".#{file.extension}")
      File.open(contract_file, 'wb') do |f|
        f.write(file.read)
      end

      zipfile.add("contrato_social.#{file.extension}", contract_file)
    end

    kit_banco.zipped_kit_file = File.open(zip_path)
    kit_banco.save!
  end