gistfile1.rb

class OpenIDStrategy < Warden::Strategies::Base                                                                                                                                         
  def authenticate!                                                                                                                                                                     
    if resp = request.env['rack.openid.response']                                                                                                                                       
      if resp.status == :failure || resp.status == :missing                                                                                                                             
        fail! "OpenID authentication failed"                                                                                                                                            
      end                                                                                                                                                                               
    elsif openid_url = request.params[:openid_url]                                                                                                                                      
      custom!([401, { "WWW-Authenticate" => "OpenID identifier=\"#{openid_url}\"" }, []])                                                                                               
    end                                                                                                                                                                                 
  end                                                                                                                                                                                   
end                                                                                                                                                                                     
Warden::Strategies.add(:openid, OpenIDStrategy)