Umbraco-CMS/src/Umbraco.Web/Controllers/RegisterController.cs

using System;
using System.Linq;
using System.Web.Mvc;
using System.Web.Security;
using umbraco.BusinessLogic;
using umbraco.cms.businesslogic.member;
using Umbraco.Web.Models;
using Umbraco.Web.Mvc;

namespace Umbraco.Web.Controllers
{
    public class RegisterController : SurfaceController
    {
        [HttpPost]
        public ActionResult HandleRegisterMember([Bind(Prefix = "registerModel")]RegisterModel model)
        {
            if (ModelState.IsValid == false)
            {
                return CurrentUmbracoPage();
            }

            model.Username = (model.UsernameIsEmail || model.Username == null) ? model.Email : model.Username;

            MembershipCreateStatus status;
            var member = Membership.CreateUser(model.Username, model.Password, model.Email,
                //TODO: Support q/a http://issues.umbraco.org/issue/U4-3213
                "", "", 
                true, out status);

            switch (status)
            {
                case MembershipCreateStatus.Success:

                    //Set member online
                    Membership.GetUser(model.Username, true);                    
                    //Log them in
                    FormsAuthentication.SetAuthCookie(member.UserName, true);

                    if (model.RedirectOnSucces)
                    {
                        return Redirect(model.RedirectUrl);
                    }

                    TempData.Add("FormSuccess", true);
                    return RedirectToCurrentUmbracoPage();

                    break;
                case MembershipCreateStatus.InvalidUserName:
                    ModelState.AddModelError((model.UsernameIsEmail || model.Username == null)
                        ? "registerModel.Email"
                        : "registerModel.Username",
                        "Username is not valid");
                    break;
                case MembershipCreateStatus.InvalidPassword:
                    ModelState.AddModelError("registerModel.Password", "The password is not strong enough");
                    break;
                case MembershipCreateStatus.InvalidQuestion:
                case MembershipCreateStatus.InvalidAnswer:
                    //TODO: Support q/a http://issues.umbraco.org/issue/U4-3213
                    throw new NotImplementedException(status.ToString());
                case MembershipCreateStatus.InvalidEmail:
                    ModelState.AddModelError("registerModel.Email", "Email is invalid");
                    break;
                case MembershipCreateStatus.DuplicateUserName:
                    ModelState.AddModelError((model.UsernameIsEmail || model.Username == null)
                        ? "registerModel.Email"
                        : "registerModel.Username",
                        "A member with this username already exists.");
                    break;
                case MembershipCreateStatus.DuplicateEmail:
                    ModelState.AddModelError("registerModel.Email", "A member with this e-mail address already exists");
                    break;
                case MembershipCreateStatus.UserRejected:
                case MembershipCreateStatus.InvalidProviderUserKey:
                case MembershipCreateStatus.DuplicateProviderUserKey:
                case MembershipCreateStatus.ProviderError:
                    ModelState.AddModelError((model.UsernameIsEmail || model.Username == null)
                        ? "registerModel.Email"
                        : "registerModel.Username",
                        "An error occurred creating the member: " + status);
                    break;
                default:
                    throw new ArgumentOutOfRangeException();
            }

            return CurrentUmbracoPage();
        }

    }
}