Pull username and password variables into JS call in karate

Question

I'm trying to do some basic authorization by using the javascript function (basic-auth.js) here to encode:

function fn(creds) {
var temp = creds.USER_NAME + ':' + creds.PASSWORD;
var Base64 = Java.type('java.util.Base64');
var encoded = Base64.getEncoder().encodeToString(temp.toString().getBytes());
return 'Basic ' + encoded;
}

Here is my authorization feature file:

@tests=auth
Feature: Auth Management
Background:
    * url baseUrl
@test=accessToken
Scenario: generate access token
    Given path '/oauth2' + '/token'
    And header Authorization = call read('basic-auth.js') { username: '#(USER_NAME)', password: '#(PASSWORD)' }
    And form field grant_type = 'client_credentials'
    When method POST
    Then status 200
    * def accessToken = response.access_token

I'm trying to call in the username and password from a stored .yml (karate-config-stg.yml) using the format of #(USER_NAME) isn't pulling in the variable from the config file even through from that same config I'm getting the baseUrl without issue. Any help on this one is very appreciated! this is a new concept I'm trying to learn.

karate-config-stg.yml all fields are deleted for this post, in my local they have the appropriate values for staging:

baseUrl: ''
USER_NAME: ''
PASSWORD: ''

Answer 1

I found out why it wasn't working properly, the issue was in my js function - instead of using the variable name of creds.USER_NAME and creds.PASSWORD I just needed to change the names to creds.username and creds.password in line 2. In my header authorization I set the variables for those 2 fields with the information from my .yml file.