Convert any image format to webp

webp.rb

class Post
has_attached_file :asset,
    :storage => :s3,
    :processors => [:webp],
    :url => ":s3_alias_url",
    :path => ":id/:filename",
    :s3_region => "your-region",
    styles: {
                webp: {
                  format: 'webp'
                },
                original: []
              },
    only_process: [:webp],
    :use_timestamp => false,
    :s3_credentials => Proc.new { |a| bucket = 'bucketname';}
  validates_attachment_content_type :asset, :content_type => ["image/jpeg", "image/png", "image/gif"]
end

module Paperclip
  class Webp < Processor
    def initialize file, options = {}, attachment = nil
      super
      @file           = file
      @attachment     = attachment
      @current_format = File.extname(@file.path) 
      @format         = options[:format]
      @basename       = File.basename(@file.path, @current_format)
    end

    def make
      temp_file = Tempfile.new([@basename, @format])
      temp_file.binmode
      run_string =  "convert #{fromfile} -quality 50  #{tofile(temp_file)}"
      Paperclip.run(run_string)
      temp_file
    end

    def fromfile
      File.expand_path(@file.path)
    end

    def tofile(destination)
      File.expand_path(destination.path)
    end
   end
 end