Question

I have a fairly simple site which allow users to connect via facebook.

I am using C# facebook sdk MVC.

At first i didn’t need any specific permission so there were no problems for users to connect. my code looked like this

public class FacebookController : BaseController
{
    public FacebookSession FacebookSession
    {
        get { return (new CanvasAuthorizer().Session); }
    }
    public ActionResult Profile()
    {
        var client = new FacebookClient(this.FacebookSession.AccessToken);
        dynamic me = client.Get("me");
        ViewBag.Name = me.name;
        ViewBag.Id = me.id;
        return View();
    }
}

and on my webconfig

<facebookSettings appId="XXXXXXXXXXXXXX" appSecret="XXXXXXXXXXXXXXXXXXXXXXXXXXXXXX"/>

After a while I needed more specific permissions so I added CanvasAuthorize to my action – as so

[CanvasAuthorize(Permissions = "user_about_me,user_relationships,email,publish_stream")]
public ActionResult Profile()

That got me this exception:
Exception Details: System.Exception: CanvasUrl is null or empty

So I added to my Webconfig the canvasUrl which got me the same error with out the canvasPage So now my web config has all 4

<facebookSettings appId="XXXXXXXXXX" appSecret="XXXXXXXXXXXXXXXXXXXXx" canvasUrl = "http://localhost:60606/" canvasPage = "https://apps.facebook.com/XXXXXXXXXXXX/"/>

So now my user can log in via facebook, my problem is that when he does log in he is getting redirect to my Facebook app (http://apps.facebook.com/XXXXXXXXX/facebook/profile)

instead back to my site(http://localhost:60606/facebook/profile)

How can I get the Permissions that i need and redirect my user back to my site after he logs in?

Thanks

Answer 1

Well, My bad

CanvasAuthorize is just as it sounds, authorization for canvas.
So you cannot use it without an app canvas on facebook.

What I should have done is use the FacebookOAuthClient

var oAuthClient = new FacebookOAuthClient(FacebookApplication.Current);
oAuthClient.RedirectUri = new Uri("XXXXXXXXXXXXXX");
var loginUri = oAuthClient.GetLoginUrl(new Dictionary<string, object> { { "state", null }, { "scope", "user_about_me,user_relationships,email" } });
return Redirect(loginUri.AbsoluteUri);