Facebook sessionValid() always fail on initial startup

[stephensullivan]

On ios the isSessionValid function of the facebook library looks at the access token and the expiration date to see if the session is valid. They show the example below to illustrate how you can start the app without logging in every time. The MOAI sdk doesn't let you et the expirationDate so MOAIFacebook.sessionValid() always fails. Is there a way you can make a MOAIFacebook setExpirationDate & setExpirationDate function available in the interface?

objective c example from facebook website:

NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
if ([defaults objectForKey:@"FBAccessTokenKey"]
&& [defaults objectForKey:@"FBExpirationDateKey"]) {
facebook.accessToken = [defaults objectForKey:@"FBAccessTokenKey"];
facebook.expirationDate = [defaults objectForKey:@"FBExpirationDateKey"];
}

[refactor]

I made a patch for the issue and request for pull to moai-beta.

https://github.com/moai/moai-beta/pull/46