class TinyurlShortener

# File lib/tinyurl_shortener.rb, line 11
def self.expand(short_url)

  # there are some ways that tinyurl redirects
  #   * using 301 location redirection
  #   * using content refresh redirection
  #
  #   when we cannot detect the redirecting way, use current url for results
  RestClient.get(short_url) do |response, request, result, &block|
    if [301, 302, 307].include? response.code
      return response.headers[:location]
    elsif ! (match = response.body.scan(/content="1; url=(.*?)"/)).empty?
      return match.last.first
    else
      response.request.url
    end
  end
end

# File lib/tinyurl_shortener.rb, line 7
def self.shorten(long_url)
  RestClient.get 'http://tinyurl.com/api-create.php', {params: {url: long_url}}
end