Check if an image can be hotlinked, or should be downloaded/not used.

check_image_hotlink_status.rb

# Usage:
#   CheckImageHotlinkStatus.call('http://some-domain/image.jpg')
class CheckImageHotlinkStatus
  require 'net/http'
  require 'uri'
  def self.call(image_url)
    uri = URI(image_url)
    req = Net::HTTP::Get.new(uri)
    req['Referer'] = 'http://your-site-here.com'
    response = Net::HTTP.start(uri.hostname, uri.port) do |http|
      http.request(req)
    end
    # Net::HTTPForbidden ...download & embed
    # Net::HTTPOK ...fine to hotlink
    # ...everything else probably remove / don't use it. (404, 500, etc.)
    puts response.class
  end
end