Zip files from remote server (S3)

zip_s3_files.rb

  protect_from_forgery :except => :get_job_resumes #Optional
  require 'zip'
  
  def get_job_resumes
    @job = Job.find(params[:job_id])
    @file = "#{Rails.root}/files/cvs.zip"
    @applications = Application.get_applicants_all(@job.id) # app context method
    Zip::ZipOutputStream.open(@file) do |zos|
      @applications.each do |application|
        user = application.user
        if user.account.resume.present? #check if file exists
          zos.put_next_entry(user.account.resume.filename) #filename
          # user.account.resume.url is a S3 file url
          zos.print(URI.parse(user.account.resume.url).read) if user.account.resume_ok?
        end
      end
    end
    send_file(@file, filename: ""+@job.slug+"_cvs.zip", type: "application/octet-stream")
  end
  
  # Prevent 404 error
  def resume_ok?   
    begin
      return false if resume.url.nil?
      (URI.parse(resume.url).read)
      return true
    rescue OpenURI::HTTPError => e
      return false
    end
  end
  
  # Requisites
  
  gem 'rubyzip'
  gem 'zip-zip'