bitly.rb

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class Bitly < ActiveResource::Base
  self.site = 'http://api.bit.ly'
  self.user = 'USERNAME'
  self.password = 'PASSWORD'
  
  cattr_accessor :login, :return_format, :api_key, :bitly_version

  self.login = 'USERNAME'
  self.api_key = 'R_your_api_key_here'
  self.return_format = 'xml'
  self.bitly_version = '2.0.1'
  
  def self.shorten(long_url)
    return long_url if long_url.length <= 20
    begin
      resp = find(:one,
        :from => "/shorten",
        :params => {
          :longUrl => long_url,
          :login => @@login,
          :apiKey => @@api_key,
          :version => @@bitly_version,
          :format => @@return_format
        }
      )
      # If response does not respond_to results, it means the XML format is incorrect.
      # In future, when bitly change their return xmls, all we have to do is update these two lines.
      raise ArgumentError unless resp.respond_to?("results") && resp.results.respond_to?("nodeKeyVal")
      resp.results.nodeKeyVal.shortUrl
    rescue ActiveResource::TimeoutError, ArgumentError
      # Return the long_url since we didn't get a shortened url.
      long_url
    end
  end
end