Sample creation code.

sample.rb

require 'open-uri'

def get_file_path()
  name = ActiveSupport::SecureRandom.hex(16)
  Rails.root.join('processing',
                  name[0],
                  name[1],
                  name[2 .. name.length]).to_s + '.pdf'
end

def call_create_sample(file_path)
  script_name = Rails.root.join('lib', 'create_sample.pl')
  logo        = Rails.root.join('lib', 'logo.png')
  samples_dir = Rails.root.join('samples')
  STDERR.puts "#{script_name} #{file_path} #{logo} #{samples_dir}"
  output_pdf  = `#{script_name} #{file_path} #{logo} #{samples_dir}`

  if $?.success? == true
    if output_pdf != nil and output_pdf =~ /\.pdf$/
      return output_pdf
    else
      return nil
    end
  else
    return nil
  end
end

def process_file(doc, d)
  url = doc.download_url('pdf')
  file_path = get_file_path()
  open(url, 'rb') do |remote|
    File.open(file_path, 'wb') do |local|
      local.write(remote.read)
    end
  end

  output_pdf = call_create_sample(file_path)
  if output_pdf == nil
    doc = Scribd::Document.upload(:file => output_pdf)
    d.scribd_sample_id = doc.doc_id
    d.scribd_sample_key = doc.access_key
    d.status = 'DONE'
    d.save
  else
    d.status = 'ERROR'
    d.save
  end
end

namespace :ns do
  task :create_samples => :environment do
    Scribd::User.login  APP.scribd.login
                        APP.scribd.password
    Document.find(:all, :conditions => "status='PROCESSING'").each do |d|
      doc = Scribd::Document.find(d.scribd_document_id.to_i)
      status = doc.conversion_status()
      if status == 'DONE'
        process_file(doc, d)
      end
    end
  end
end