Meteor 访问令牌

使用时Meteor http://meteor.com，与新的验证 https://github.com/meteor/meteor/tree/auth系统，我怎样才能获得facebook访问令牌，当登录时accounts-facebook包裹？

从 Meteor.method 获取它：

// server
Meteor.methods({
  getAccessToken : function() {
    try {
      return Meteor.user().services.facebook.accessToken;
    } catch(e) {
      return null;
    }
  }
}); 

// client
Meteor.call("getAccessToken", function(error, accessToken){
   console.log(accessToken);
})

或发布它：

//server
Meteor.publish("currentUserAccessToken", function(){
    var self = this;
    if (this.userId()){
        handle = Meteor.users.find(this.userId()).observe({
            added: function(user){
                self.set("currentUserAccessToken", user._id, {value: user.services.facebook.accessToken});
                self.flush();
            },
            changed: function(user){
                self.set("currentUserAccessToken", user._id, {value: user.services.facebook.accessToken});
                self.flush();
            }
        });

        this.onStop(function() {
            handle.stop();
        });
    }
});

//client
var AccessToken = new Meteor.Collection("currentUserAccessToken");
Meteor.subscribe("currentUserAccessToken");

//access the value
var accessToken = AccessToken.findOne().value;