问使用everyauth时需要注意的问题

EN

var exp = require('express');
var app = exp.createServer();

var conf = require('/Users/lakeshkansakar/clicker/node_modules/everyauth/example/conf')
var everyauth = require('everyauth');

everyauth.debug = true;

var usersById = {};
var nextUserId = 0;

function addUser (source, sourceUser) {
  var user;
  user = usersById[++nextUserId] = {id: nextUserId};
  user[source] = sourceUser;
  return user;
}

var usersByFbId = {};
var usersByTwitId = {};

everyauth.everymodule
  .findUserById( function (id, callback) {
    callback(null, usersById[id]);
  });

everyauth
  .facebook
    .appId(conf.fb.appId)
    .appSecret(conf.fb.appSecret)
    .findOrCreateUser( function (session, accessToken, accessTokenExtra, fbUserMetadata) {
      return usersByFbId[fbUserMetadata.id] || (usersByFbId[fbUserMetadata.id] = addUser('facebook', fbUserMetadata));;
    })
    .redirectPath('/');

everyauth
  .twitter
    .consumerKey(conf.twit.consumerKey)
    .consumerSecret(conf.twit.consumerSecret)
    .findOrCreateUser( function (sess, accessToken, accessSecret, twitUser) {
      return usersByTwitId[twitUser.id] || (usersByTwitId[twitUser.id] = addUser('twitter', twitUser));;
    })
    .redirectPath('/');