Changing AuthToken to be complex type so can have a version, rather than just a string

src/link_codes.ts

@@ -1,7 +1,12 @@
 import { v4 as uuid } from 'uuid';
 
+export type AuthToken = {
+  value: string,
+  version: string
+}
+
 export type Association = {
-  authToken: string
+  authToken: AuthToken
   userId: string
   nickname: string  
 }

src/music_service.ts

@@ -1,5 +1,6 @@
 import axios from "axios";
 import { Md5 } from "ts-md5/dist/md5";
+import { AuthToken } from "./link_codes";
 
 const s = "foobar100";
 const navidrome = process.env["BONOB_NAVIDROME_URL"];
@@ -13,7 +14,7 @@ export function isSuccess(authResult: AuthSuccess | AuthFailure): authResult is
 }
 
 export type AuthSuccess = {
-  authToken: string
+  authToken: AuthToken
   userId: string
   nickname: string  
 }
@@ -28,7 +29,7 @@ export interface MusicService {
 
 export class Navidrome implements MusicService {
   login({ username }: Credentials) {
-    return { authToken: `${username}`, userId: username, nickname: username }
+    return { authToken: { value: `${username}`, version: "1" }, userId: username, nickname: username }
   }
 
   ping = (): Promise<boolean> =>

src/server.ts

@@ -129,8 +129,8 @@ function server(
           if (association) {
             return {
               getDeviceAuthTokenResult: {
-                authToken: association.authToken,
-                privateKey: "v1",
+                authToken: association.authToken.value,
+                privateKey: association.authToken.version,
                 userInfo: {
                   nickname: association.nickname,
                   userIdHashCode: crypto