The authentication has expired as a result of the user's logout

I find myself in a dilemma and I am still struggling to come up with a solution.

Here is the situation:

  1. A visitor goes to my website

  2. The visitor clicks on Login with Facebook (so that my App can access their Facebook information through the API graph).

  3. The visitor logs in using their Facebook credentials and grants permission to the App.

  4. The visitor is then redirected back to the same page where they clicked on the Login with Facebook button (in step 2, because the button triggers the method

    RedirectToFacebookAuthorization()
    ).

  5. The visitor later logs out from Facebook.com (my website does not have a logout button for this specific scenario).

  6. After successfully logging out from their Facebook account, the visitor returns to my website.

  7. My website displays an exception message as follows:

Exception Details: Facebook.Utility.FacebookException: The session is invalid because the user logged out.

Answer №1

If an exception is thrown and the reason is known, it should be handled in the code by logging out the user from the site as well.

Consider exploring different approaches to handle this error, such as this example:

if(ex.Message == "The session is invalid because the user logged out") 
{
    //timeout caused by user logging out of FB (auth token remains in qstring) 
    Session.Remove("Facebook_session_key"); 
    Session.Remove("Facebook_userId");
    Session.Remove("Facebook_session_expires");

    //redirect to login
    Response.Redirect(@"http://www.Facebook.com/login.php?api_key=" + fbService.ApplicationKey + @"&v=1.0\");
}

It is also important to inspect the ErrorType property of the exception:

public enum ErrorType
{
    Unknown = 1,
    ServiceUnavailable = 2,
    RequestLimit = 4,
    Timeout = 102,
    Signing = 104,
    InvalidUser = 110,
    InvalidAlbum = 120,
    UserNotVisible = 210,
    AlbumNotVisible = 220,
    PhotoNotVIsible = 221,
    InvaldFQLSyntax = 601
}

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