gistfile1.js

router.get('/unlink/facebook', function(req, res){
	var user = req.user;

	user.facebook.token = null;

	user.save(function(err){
		if(err)
			throw err;
		if(!hasActiveLink(user))
			res.redirect('/auth/logout');
		else
			res.redirect('/profile');
	})
});
	
router.get('/unlink/google', function(req, res){
	var user = req.user;
	user.google.token = null;

	user.save(function(err){
		if(err)
			throw err;
		if(!hasActiveLink(user))
			res.redirect('/auth/logout');
		else
			res.redirect('/profile');
	});
});
	
function hasActiveLink(user){
	return (user.facebook.token || user.google.token);
}