gistfile1.rb

class UserSessionsController < ApplicationController

  # ...

  def rpx_token
    data = RPXNow.user_data( params[:token], RPX_API_KEY )
    
    if data.blank?
      flash[:error] = I18n.t("auth.failed")
      redirect_to(new_user_session_path)
    else
      session = UserSession.find

      # Fresh log in
      if session.blank?
        rpx_mapping_id = data[:id] unless data[:id] == "0"
        
        @user = User.find_or_initialize_by_id( rpx_mapping_id )

        if @user.new_record?
          @user.name = data[:name] || data[:displayName] || data[:nickName]
          @user.rpx = true
          @user.save!
        end

        RPXNow.map( data[:identifier], @user.id, RPX_API_KEY )
        session = UserSession.new(@user)
        session.save

        flash[:notice] = I18n.t("auth.logged_in")
        redirect_to( user_path(session.user) )
        
      # User already logged in
      else
        user = session.user
        RPXNow.map( data[:identifier], user.id, RPX_API_KEY )
        user.rpx = true
        user.save
        
        flash[:notice] = I18n.t("auth.rpx_mapped")
        redirect_to( edit_user_path(session.user) )
      end

    end
  end

end