module Rack
  class Embiggener
    def initialize(app)
      @app = app
    end
    
    def call(env)
      status, headers, body = @app.call(env)
      headers.delete('Content-Length')
    
      response = Rack::Response.new(
        Rack::Embiggener.embiggen_urls(body),
        status,
        headers
      )
    
      response.finish
      return response.to_a
    end
        
    def self.embiggen_urls(original_body)

     new_body = []
      
      original_body.each { |line|
        tinys = line.scan(/(http:\/\/(?:www\.)?tinyurl\.com\/(.{6}))/)
  
     new_body << tinys.uniq.inject(line) do |body, tiny|
    
     original_tiny = tiny[0]
    
     preview_url = "http://preview.tinyurl.com/#{tiny[1]}"
    
     response = Net::HTTP.get_response(URI.parse(preview_url))
    
     embiggened_url = response.body.match(/redirecturl" href="(.*)">/)[1]
    

    body.gsub(original_tiny, embiggened_url)
  
     end

     }

     
      new_body

   end
  end

end