mapknitter/app/controllers/application_controller.rb

class ApplicationController < ActionController::Base
  #include OpenIdAuthentication # shouldn't be necessary!!
  # Prevent CSRF attacks by raising an exception.
  # For APIs, you may want to use :null_session instead.
  protect_from_forgery with: :exception

  helper :all # include all helpers, all the time

  before_filter :current_user, :check_subdomain
  helper_method :logged_in?

  def current_user
    user_id = session[:user_id] 
    if user_id
      begin
        @user = User.find(user_id)
      rescue
        @user = nil
      end
    else
      @user = nil
    end
  end

  def check_subdomain
    if request.subdomain.present?
      redirect_to 'http://' + request.domain + request.port_string + request.fullpath
    end
  end

  private

    def require_login
      unless logged_in?
        path_info = request.env['PATH_INFO']
        flash[:warning] = "You must be logged in to access this section"
        redirect_to '/login?back_to=' + URI.encode(path_info) # halts request cycle
      end
    end

    def logged_in?
      user_id = session[:user_id]

      begin
        if user_id and User.find(user_id)
          return true
        else
          return false
        end
      rescue
        return false
      end
    end

end