public override void OnActionExecuting(ActionExecutingContext filterContext)
{
var fbContext = filterContext.Controller as IFacebookContext;
if (fbContext == null)
{
throw new FacebookSharpException(
"Controller must implement IFacebookContext inorder to use FacebookAuthorizeAttribute.");
}
string errorReason = filterContext.HttpContext.Request["error_reason"];
string code = filterContext.HttpContext.Request["code"];
FacebookAuthenticationResult far;
if (string.IsNullOrEmpty(errorReason))
{
if (RetriveAccessTokenManually)
{
far = new FacebookAuthenticationResult(string.Empty, 0, errorReason);
}
else
{
var settings = fbContext.FacebookContext.Settings;
long expiresIn;
string accessToken = Facebook.ExchangeAccessTokenForCode(code, settings.ApplicationKey, settings.ApplicationSecret,
settings.PostAuthorizeUrl, settings.UserAgent, out expiresIn);
far = new FacebookAuthenticationResult(accessToken, expiresIn, errorReason);
}
}
else
{
far = new FacebookAuthenticationResult(string.Empty, 0, errorReason);
}
filterContext.ActionParameters[FacebookAuthenticationResultParameterName] = far;
filterContext.ActionParameters["code"] = code;
base.OnActionExecuting(filterContext);
}