ekylibre/paperclip-document

module Paperclip
  module Document
    module Processors
      # This processor converts document to PDF
      class Freezer < Paperclip::Document::Processor
        def initialize(file, options = {}, attachment = nil)
          super
          @format = options[:format]
          unless @format == :pdf
            raise Paperclip::Error, 'Valid format (pdf) must be specified'
          end
        end

        # Convert the document to pdf
        def make
          destination_path = tmp_dir.to_s
          destination_file = File.join(destination_path, basename + ".#{@format}")
          if pdf_format?
            destination_file = file_path.to_s
          else
            Docsplit.extract_pdf(file_path.to_s, output: destination_path)
          end
          File.open(destination_file)
        end

        def pdf_format?
          File.open(file_path, 'rb', &:readline).to_s =~ /\A\%PDF-\d+(\.\d+)?$/
        end
      end
    end
  end
end