'use strict';
const box = require('box-node-sdk');
const fs = require('fs');

let configFile = fs.readFileSync('config.json');
configFile = JSON.parse(configFile);
let session = box.getPreconfiguredInstance(configFile);
let serviceAccountClient = session.getAppAuthClient('enterprise');

serviceAccountClient.enterprise.addAppUser("externalID", { "external_app_user_id": "auth0ID" })
  .then((user) => {
    console.log(user);
  })
  .catch((err) => {
    handleConflictError(err);
  });

const handleConflictError = (err) => {
  let userID;
  if (err && err.response && err.response.body && err.response.body.context_info &&
    err.response.body.context_info && err.response.body.context_info.conflicts) {
    if (err.response.body.context_info.conflicts.length > 0) {
      userID = err.response.body.context_info.conflicts[0].id;
      console.log("User already exists");
      console.log(userID);
    }
  }
}