gistfile1.rb

class UserSessionsController < ApplicationController
  def rpx_create
    RPXNow.api_key = [YOUR RPX KEY]
    data = RPXNow.user_data(params[:token], :extended => 'true')
    if data.blank?
      @user_session = UserSession.new
      flash[:error] = "Authentication failed."
      respond_to do |format|
        format.html { render :action => :new }
      end
    else
      # Authentication good.. check if need to "sign up"...
      primary_key = data[:id]
      unless primary_key
        # Need to "sign up", store the token so we can get the data again later...
        session[:rpx_token] = params[:token]
        redirect_to rpx_signup_path
      else
        # This OpenID has already "signed up" and been associated to a local user.  They are already
        # authenticated so just create their session for them.
        @user = User.find(primary_key)
        if @user
          UserSession.create(@user)      
          respond_to do |format|
            format.html { redirect_back_or_default home_path }
          end
        else
          flash[:error] = "Unable to find the user that your third-party account maps to.  Please contact support@cafecourses.com for help."
          respond_to do |format|
            format.html { render :action => :new }
          end
        end
      end
    end
  end
end