Paperclip::ContentTypeProcessor

Allows to add file processing by content type for paperclip attachments.

libmagic

Add this line to your application's Gemfile:

gem 'paperclip-content_type_processor'

And then execute:

$ bundle

Or install it by yourself as:

$ gem install paperclip-content_type_processor

1. Specify file processing per content type:

Paperclip::ContentTypeProcessor.add_content_type_processor("content/type", "command", "command arguments")

2. Add content type processor for attachment:

has_attached_file :avatar,
    styles: { medium: '96x96#' },
    processors: [:thumbnail, :content_type_processor]
end

It can be used for image compression/optimizations.

1. Install image optimizers:

   • jpegoptim (http://freecode.com/projects/jpegoptim)
   • optipng (http://optipng.sourceforge.net/)

2. Add initializer in your rails app config/initializers/content_type_processor.rb, and specify file processing per content type:

Paperclip::ContentTypeProcessor.add_content_type_processor("image/jpeg", "jpegoptim", "--strip-all --max=90")
Paperclip::ContentTypeProcessor.add_content_type_processor("image/png", "optipng", "-o6 -strip all")

3. Enable content type processing for user avatars:

class User < ActiveRecord::Base
  has_attached_file :avatar,
    styles: { medium: '96x96#' },
    processors: [:thumbnail, :content_type_processor]
end

So all user avatars will be processed by 'jpegoptim' or 'optipng' according to its content type.

Note! If you want to generate thumbnails, you should also specify :thumbnails in processor list

1. Fork it ( http://github.com/ingeniarius/paperclip-content_type_processor/fork )
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Add some feature')
4. Push to the branch (git push origin my-new-feature)
5. Create new Pull Request