Simple web request file caching system (similar to wget)

webcache.rb

require 'FileUtils'
require 'net/http'
require 'uri'

class WebCache
  def initialize
    @download_cache_root = "./downloads"
  end

  def url_to_path(url)
    uri = URI(url)
    if uri.query
      query = uri.query
    else
      query = "index.html"
    end

    return File.join(@download_cache_root, uri.host, uri.path, query)
  end

  def get(url)
    file_path = url_to_path(url)
    if not File.exists?file_path
      # create directory if needed 
      dir_path = File.dirname(file_path)
      if not File.exists?dir_path
        FileUtils.mkdir_p(dir_path)
      end
      # download file 
      File.open(file_path, "w") do |data|
         data << Net::HTTP.get_response(URI.parse(url)).body
      end
    end
    return File.new(file_path).read
  end
end