mvc 3, jquery ajax & forms authentication

In my MVC3 project, I have a controller with an [Authorize] attribute. I have a form submission without ajax, which redirects the user (as expected) to the login screen, if he/she is not logged in.

However, now I have a form which is submitted with jquery ajax, and how can I do the same thing? Redirect the user to the login screen, if he/she is not authorized? After a successful login, the user should is redirected to the initial action.

Controller

[Authorize]
[ValidateInput(false)] 
public JsonResult SubmitChatMessage(string message)
        {
            if (!string.IsNullOrEmpty(message))
            {
                // Do stuff
            }

            // Return all chat messages
            return GetChatMessages();
        }

Client JQUERY

$(document).ready(function () {
    $("form[action$='SubmitChatMessage']").submit(function (event) {
        $.ajax({
            url: $(this).attr("action"),
            type: "post",
            dataType: "json",
            data: $(this).serialize(),
            success: function (response) {
                // do stuff
            }
        });
        return false; 
    });
});

I can see from firebug console window, that the server returns:

GET http://domain/Account/LogOn?ReturnUrl=%2fProductDetails%2fSubmitChatMessage

Looking forward to your help!

UPDATED with po开发者_如何学Cssible solutions

• The different solutions are outlined here
• Another variant of one of the solutions
• Tutorial which might give some inspiration

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Yep, this is one of things i've always hated about Forms Authentication in ASP.NET - does not cater for AJAX authentication at all. Add IIS handling 401's into the mix, and it can be quite a pain.

There's a few ways to do this, none of them particulary "clean".

These include:

1. Set a ViewBag flag in the controller, which corresponds to Request.IsAuthenticated, then re-write the submit button click event to the login page if they're not authenticated.

2. Make your AJAX action return JsonResult, which a property for "code". Where a code of 0 can be success, 1 can be unauthenticated, 2 can be some other data issue, etc. Then check for that code in the complete $.ajax callback and redirect to the login page.

3. Check the $.ajax jqXHR response object for a status code of 403, and redirect to the login page.

4. Write a custom HTML helper for your submit button, which renders either a regular submit button, or a anchor tag which goes to the login page, depending on the authentication status.

5. Write a custom authorize attribute which checks if Request.IsAjaxRequest(), and returns a custom JSON object, instead of the default behaviour which is to redirect to the login page (which can't happen for AJAX requests).

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It's a bit of a pain, to be honest. Even more so, in my opinion, if you're using Federated Identity, such as Windows Identity Foundation and/or Azure AppFabric Access Control Service.

Your Ajax calls can't handle the redirect.

My solution/suggestion is not to mark your Ajax-invoked controller action methods with [Authorize], but instead rely on the presence of some value that you insert into Session State from a controller action that does have an [Authorize] (typically the controller action method that was called to display the view). You know that the value can't have got into Session State unless the user was authenticated (and the session hasn't timed out). Fail the call to your Ajax method if this value isn't present, returning a specific JSON result that you can handle gracefully in your client-side code.

Using [Authorize] on an Ajax controller method causes weird, often hidden, errors (such as updates disappearing).