Get images from Class, pack into Zip file and upload to S3. Notify user by mail with url for zip file

download_zip.rb

class << self
    def download_zip(user, photo_ids)
      photos = SurveyPhoto.find photo_ids.gsub(' ', ',').split(",")
      zipfile_name = File.join(Rails.root, "tmp", "archive.zip")

      Zip::ZipOutputStream.open(zipfile_name) do |zipfile|

        photos.each do |photo|
          if photo.image.present?
            zipfile.put_next_entry("#{Time.now.strftime('%M%S')}-#{photo[:image]}")
            zipfile.write photo.image.file.read
          end
        end
      end

      storage = Fog::Storage.new(:provider => 'AWS', :aws_access_key_id => ENV['AWS_ACCESS_KEY'], :aws_secret_access_key => ENV['AWS_SECRET_KEY'])
      bucket = ENV['AWS_BUCKET']
      web_file_name =  "fotos-#{Time.now.strftime('%d-%m-%y_%H-%M')}.zip"
      storage.put_object(
        bucket,
        File.join("zip_photos/", web_file_name),
        File.open(zipfile_name),
        {'x-amz-acl' => 'public-read'}
      )
      File.delete(zipfile_name)

      download_link = "https://#{bucket}.s3.amazonaws.com/zip_photos/#{web_file_name}"
      UserMailer.download_photos(user.email, download_link).deliver
    end
    handle_asynchronously :download_zip
  end