Javascript：在方法内部调用方法本身（具有原始参数）

Question

i develop a class to upload a file to imageshack. For this you have to do a authorization first to get a auth_id.

Because of i use this in nodejs i don't want to create the auth_id every time i upload a image. For that i need something like this:

function test(){
  this.auth = "";
}

// Callback will execute when file-upload is finish
test.prototype.upload = function(file, callback) {
   if(this.auth == "") {
       /*** HERE I NEED HELP: ***/
       this.make_auth(this.upload(file,callback));
   }else{
     // Do upload and then
     callback();
   }
}

test.prototype.make_auth = function(callback) {
    // Make auth...
    this.auth = "01020312032";
    callback();
}

What i want to do: - Check if this.auth is set - If this.auth == "" make the auth and call the upload-function again after finish with the original parameters

How i can do this?

Answer 1

Change:

this.make_auth(this.upload(_paramters));

To something like:

var self = this;
this.make_auth(function() { self.upload(_paramters); });

You should probably be passing a possible err to your callback in make_auth in case authentication fails.