image_resizer.rb

require 'bundler/setup'
require 'sinatra/base'

require 'dragonfly'

# http://cdn.bootic.net/224/original/25369-eyeglasses.jpg

class App < Sinatra::Base
  
  set :images_app, (
    Dragonfly[:images].configure_with(:imagemagick).tap do |app|
      app.cache_duration = 3600*24*365*3
    end
  )
  
  set :error_images_app, (
    Dragonfly[:error_images].configure_with(:imagemagick).tap do |app|
      app.cache_duration = 1800 # half hour
    end
  )
  
  get '/r/:shop_id/:size/:image_path' do |shop_id, size, image_path|
    origin_url = "http://cdn.bootic.net/#{shop_id}/original/#{image_path}"

    begin
      #image = settings.images_app.fetch_url(origin_url)
      image = settings.images_app.fetch_file("./#{image_path}")
      image.image?
    rescue Exception => e
      image = settings.error_images_app.fetch_file('./404.png')
      # Notify exception
    ensure
      image.thumb! "#{size}#"
    end
    puts "serving #{size}"
    image.to_response(env)
  end
end