require 'net/http' class UrlValidator < ActiveModel::EachValidator def validate_each(record, attribute, value) url = value # Regex code by 'Arsenic' from http://snippets.dzone.com/posts/show/3654 if url =~ /^ ( (https?):\/\/ )? ( [a-z\d]+([\-\.][a-z\d]+)*\.[a-z]{2,6} ) ( (: ( \d{1,5} ) )? ( \/.* )? )? $/ix url = "http#{'s' if $7 == '81'}://#{url}" unless $1 else record.errors[attribute] << 'Not a valid URL' end if options[:verify] begin url_response = RedirectFollower.new(url).resolve url = url_response.url if options[:verify] == [:resolve_redirects] rescue RedirectFollower::TooManyRedirects record.errors[attribute] << 'URL is redirecting too many times' rescue record.errors[attribute] << 'could not be resolved' end end if options[:update] value.replace url end end end # Code below written by John Nunemaker # See blog post at http://railstips.org/blog/archives/2009/03/04/following-redirects-with-nethttp/ class RedirectFollower class TooManyRedirects < StandardError; end attr_accessor :url, :body, :redirect_limit, :response def initialize(url, limit=5) @url, @redirect_limit = url, limit end def logger @logger ||= Rails.logger end def resolve raise TooManyRedirects if redirect_limit < 0 self.response = Net::HTTP.get_response(URI.parse(url)) logger.info "redirect limit: #{redirect_limit}" logger.info "response code: #{response.code}" logger.debug "response body: #{response.body}" if response.kind_of?(Net::HTTPRedirection) self.url = redirect_url self.redirect_limit -= 1 logger.info "redirect found, headed to #{url}" resolve end self.body = response.body self end def redirect_url if response['location'].nil? response.body.match(/]+)\">/i)[1] else response['location'] end end end