Paperclip post process - How to compress image using jpegoptim/optpng

paperclip, ruby-on-rails-3

Solution

Since there's no other answers, here is how I do it in my project and it seems it's being working ok for several months.

class AttachedImage < ActiveRecord::Base
  belongs_to :attachable, :polymorphic => true

  validates_attachment_presence :image
  validates_attachment_content_type :image, :content_type=>['image/jpeg', 'image/png', 'image/gif']

  has_attached_file :image,
                    :styles => {:thumb => '50x50>', :preview => '270x270>' },
                    # :processors => [:image_compressor],
                    :url => "/system/:class/:attachment/:id/:basename_:style.:extension",
                    :path => ":rails_root/public/system/:class/:attachment/:id/:basename_:style.:extension"


  after_post_process :compress

  private
  def compress
    current_format = File.extname(image.queued_for_write[:original].path)

    image.queued_for_write.each do |key, file|
      reg_jpegoptim = /(jpg|jpeg|jfif)/i
      reg_optipng = /(png|bmp|gif|pnm|tiff)/i

      logger.info("Processing compression: key: #{key} - file: #{file.path} - ext: #{current_format}")

      if current_format =~ reg_jpegoptim
        compress_with_jpegoptim(file)
      elsif current_format =~ reg_optipng
        compress_with_optpng(file)
      else
        logger.info("File: #{file.path} is not compressed!")
      end
    end
  end

  def compress_with_jpegoptim(file)
    current_size = File.size(file.path)
    Paperclip.run("jpegoptim", "-o --strip-all #{file.path}")
    compressed_size = File.size(file.path)
    compressed_ratio = (current_size - compressed_size) / current_size.to_f
    logger.debug("#{current_size} - #{compressed_size} - #{compressed_ratio}")
    logger.debug("JPEG family compressed, compressed: #{ '%.2f' % (compressed_ratio * 100) }%")
  end

  def compress_with_optpng(file)
    current_size = File.size(file.path)
    Paperclip.run("optipng", "-o7 --strip=all #{file.path}")
    compressed_size = File.size(file.path)
    compressed_ratio = (current_size - compressed_size) / current_size.to_f
    logger.debug("#{current_size} - #{compressed_size} - #{compressed_ratio}")
    logger.debug("PNG family compressed, compressed: #{ '%.2f' % (compressed_ratio * 100) }%")   
  end                              
end

Problem

I would like to use `jpegoptim` or `optipng` to compress the image uploaded by users via Paperclip. I have a Paperclip model configured as: ``` has_attached_file :image, :styles => {:thumb => '50x50>', :preview => '270x270>' }, :url => "/system/:class/:attachment/:id/:basename_:style.:extension", :path => ":rails_root/public/system/:class/:attachment/:id/:basename_:style.:extension" ``` Question 1: Is it possible to compress the original image uploaded by user, then let Paperclip resize it , so there's only one compress process? and how to do it? Question 2: I am going to do it via the `after_post_process` callback, and I could get all the instances of three files from `image.queued_for_write` and I would like to trigger jpegoptim/optipng by the file extension, but when I use `current_format = File.extname(file.path)`, I get something like: `.jpg20120508-7991-cqcpf2`. Is there away to get the extension string `jpg`? or is it safe that I just check if the extension string is contained in that string?

Original source