source: branches/1888_OaaS/HeuristicLab.Services.Optimization.Web/Controllers/BaseController.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using HeuristicLab.Services.Optimization.Web.Helpers;
using HeuristicLab.Services.Optimization.Billing.Interfaces;
using System.Web.Security;
using HeuristicLab.Services.Optimization.Billing;
using HeuristicLab.Services.Optimization.Billing.Business;

namespace HeuristicLab.Services.Optimization.Web.Controllers
{
    public class BaseController : Controller
    {
      private IOptimizationBilling billing = BillingServiceProvider.Instance;

      protected ControllerServiceHelper ControllerService {
        get {
          var helper = new ControllerServiceHelper(Session["pw"] as string);
          RedirectToLoginIfNecessary();
          return helper;
        }
      }

      protected string UserName {
        get { MembershipUser currentUser = Membership.GetUser(User.Identity.Name, true /* userIsOnline */); return currentUser.UserName; }
      }

      protected bool RedirectToLoginIfNecessary(string destination="%2fOptimization", bool orderNecessary=true) {
        var pw = Session["pw"] as string;
        if (pw == null) {
          Response.Redirect("/Account/Logon?ReturnUrl=" + destination);
          return true;
        }
        if (orderNecessary && BillingComponent.Enabled)
          return RedirectToCreateOrderIfNecessary();
        return false;
      }

      protected bool RedirectToCreateOrderIfNecessary() {
        MembershipUser currentUser = Membership.GetUser(User.Identity.Name, true /* userIsOnline */);
        var activeOrderOfUser = (from order in billing.GetOrdersByState(Billing.Model.OrderState.Active) where order.User.Name == currentUser.UserName select order).FirstOrDefault();
        if (activeOrderOfUser == null) {
          // create a new order if there is no active order available
          Response.Redirect("/Order/Overview");
        }
        return false;
      }
    }
}