# Via: http://almosteffortless.com/2009/02/09/quick-and-dirty-url-validation/

class Link < ActiveRecord::Base
 
  attr_accessible :url
  validate :validate_url
 
private
 
  def validate_url
    errors.add(:url) unless %w(200 301 302).include?(Link.status_code(self.url))
  end
 
  def self.status_code(url)
    regexp = url.match(/https?:\/\/([^\/]+)(.*)/)
    path = regexp[2].blank? ? '/' : regexp[2]
    Net::HTTP.start(regexp[1]) {|http| http.head(path).code}
  rescue
    nil
  end
 
end