/**
  * Obtain the user information from GitHub.
  *
  * @param Guard $auth
  * @param Registrar $registrar
  * @return Response
  */
 public function handleProviderCallback(Guard $auth, Registrar $registrar)
 {
     $user = Socialite::driver('facebook')->user();
     $details = array();
     $found_user = User::findByEmailOrFail($user->getEmail());
     if ($found_user) {
         $auth->loginUsingId($found_user->id);
         return redirect()->intended('/home');
     } else {
         $details['name'] = $user->getName();
         $details['email'] = $user->getEmail();
         $details['user_type'] = 'normal';
         $details['mobile_no'] = '';
         $details['password'] = bcrypt(str_random(8));
         $auth->login($registrar->create($details));
         Session::flash('status', 'You have successfully logged in via Facebook.');
         return redirect()->intended('/home');
     }
     return 'Success';
 }