Link Validation

article.rb

class Article < ActiveRecord::Base
  # ...

  def embedded_links
    self.body_html.scan(/<a.+?href="(.+?)".+?/) if body_html
  end
  
  def has_links?
    self.embedded_links.flatten.present?
  end
end

link_validator.rb

require 'net/http'
require 'uri'
require 'ostruct'

class LinkValidator
  def self.parse!
    [].tap do |result|
      Article.all.each do |article|
        if article.has_links?
          links = article.embedded_links.flatten.collect do |link|
            "<span class=\"invalid\">#{link}</span>" unless valid?(link)
          end.compact.flatten
          
          unless links.blank?
            result << OpenStruct.new(
              :title => article.title,
              :edit_link => "/articles/#{article.id}/edit",
              :links => links
            )
          end
        end
      end
    end
  end
  
private
  def self.valid?(url)
    uri = URI.parse(url)
    
    code = begin
      Net::HTTP.start(uri.host, uri.port) do |http|
        http.head(uri.request_uri).code
      end
    rescue
      nil
    end
    
    [200, 301].include?(code.to_i)
  end
end