"(190) Invalid OAuth access token signature" with FacebookWebContext HasPermission

I just upgrated from the old facebook sdk to the new Facebook C# SDK 5.0.25 (RTW). I'm doing a simple login to my site with some exteded permissions such as email,read_stream,publish_stream,offline_access.

Everything works fine until I check for a permission: if (fbWebContext.HasPermission("email"))... When I do that I get : Facebook.FacebookOAuthException: (190) Invalid OAuth access token signature.

Are you facing that problem?

The following is the code that I'm using:

JS:

    FB.login(function (response) {
        if (response.session) {
            if (response.perms) {
                // user is logged in and granted some permissions.
                // perms is a comma separated list of granted permissions
            } else {
                // user is logged in, but did not grant any perm开发者_StackOverflow社区issions
            }
            window.location.reload();
        } else {
            // user is not logged in
        }
    }, { perms: 'email,read_stream,publish_stream,offline_access' });

C#:

        var fbWebContext = FacebookWebContext.Current;

        if (fbWebContext.IsAuthorized())
        {
            var permissions = new FacebookWebAuthorizer(fbWebContext).Permissions;
            if (fbWebContext.HasPermission("email")) ...

Is there something wrong with this approach?

Thanks

---

I use a different approach:

I don't declare a new variable for the FacebookWebContext. I don't check is IsAuthorized (to me it gave some problems inside an App).

So, if I were you I would simply try the following, which includes also an authorize request in case the user has not previously given the permissions. Hope this helps.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using Facebook.Web;

namespace FacebookCsharpDemo
{
    public partial class askPerm2 : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {

            if (FacebookWebContext.Current.HasPermission("email"))
            {
                //permissions given
                processEmail();
            }
            else
            {
                var auth = new CanvasAuthorizer { Permissions = new[] { "user_about_me", "email" } };

                if (auth.Authorize())
                {
                    processEmail();
                }
                else
                {
                    //show permissions error message - not really - facebook c# sdk will redirect the user to the cancelUrlPath defined in the web.config...
                    litEmail.Text = "You must authorize the Application, please try again";
                }

            }

        }

        private void processEmail()
        {
            var fb = new FacebookWebClient();
            dynamic me = fb.Get("me");

            litEmail.Text = me.email;
        }

    }
}

In the .aspx page just put a literal called litEmail.