Ruby example of deriving the best high-res product image for a Best Buy product

product.rb

class Product < ActiveRecord::Base

  attr_accessible :data, :sku
  serialize :data, JSON

  def data=(data)
    write_attribute :data, data
    return unless data?
    self.primary_high_res_url = high_res
  end  

  def high_res(*search)
    return nil unless data.present?
    search = [ 'largeFrontImage', 'largeImage', 'angleImage', 'image' ] unless search.present?
    search.map do | name |
      self.class.high_res data[name]
    end.flatten.to_set.find do | url |
      url.present? and self.class.found? url
    end
  end

  def self.high_res(url)
    return [] unless url.present?
    return [] if url.ends_with? '.gif' or url.include? 'default_hardlines'
    url = url.gsub(/.\.jpg/, 'a.jpg')
    url =~ /\d+_.*_/ ? [ url.gsub(/(\d+)_.*_/, '\1_500x500_'), url.gsub(/(\d+)_.*_/, '\1_') ] : [ url ]
  end

  def self.found?(url)
    begin
      Faraday.new(url: url) { |faraday| faraday.adapter :net_http } .head.status == 200
    rescue Faraday::Error::TimeoutError => e
      logger.error "Timed out checking for high_res image URL"
      false
    end
  end

end