// Call facebook API to verify the token is valid

verifyFacebookUserAccessToken.js

// Call facebook API to verify the token is valid
// https://graph.facebook.com/me?access_token=$token
function verifyFacebookUserAccessToken(token) {
	var deferred = Q.defer();
	var path = 'https://graph.facebook.com/me?access_token=' + token;
	request(path, function (error, response, body) {
		var data = JSON.parse(body);
		if (!error && response && response.statusCode && response.statusCode == 200) {
			var user = {
				facebookUserId: data.id,
				username: data.username,
				firstName: data.first_name,
				lastName: data.last_name,
				email: data.email
			};
			deferred.resolve(user);
		}
		else {
			console.log(data.error);
			//console.log(response);
			deferred.reject({code: response.statusCode, message: data.error.message});
		}
	});
	return deferred.promise;
}