fix(xo-server-auth-iodc): fix empty usernames with default config

See https://xcp-ng.org/forum/post/59587

CHANGELOG.unreleased.md

@@ -13,6 +13,7 @@
 
 - [Backup/Restore] Fix restore via a proxy showing as interupted (PR [#6702](https://github.com/vatesfr/xen-orchestra/pull/6702))
 - [REST API] Backup logs are now available at `/rest/v0/backups/logs`
+- [Plugin/auth-oidc] Fix empty user names when using default config [Forum#59587](https://xcp-ng.org/forum/post/59587)
 
 ### Packages to release
 
@@ -32,6 +33,7 @@
 
 - @xen-orchestra/backups minor
 - xo-server minor
+- xo-server-auth-oidc patch
 - xo-web patch
 
 <!--packages-end-->

packages/xo-server-auth-oidc/index.js

@@ -20,11 +20,12 @@ exports.configurationSchema = {
     advanced: {
       title: 'Advanced',
       type: 'object',
+      default: {},
       properties: {
         authorizationURL: { title: 'Authorization URL', type: 'string' },
         callbackURL: {
-          description: 'Default to https://<xo.company.net>/signin/oidc/callback`.',
           title: 'Callback URL',
+          default: '/signin/oidc/callback',
           type: 'string',
         },
         issuer: { title: 'Issuer', type: 'string' },
@@ -55,7 +56,7 @@ class AuthOidc {
   }
 
   async configure({ advanced, ...conf }, { loaded }) {
-    this.#conf = { callbackURL: '/signin/oidc/callback', ...advanced, ...conf }
+    this.#conf = { ...advanced, ...conf }
 
     if (loaded) {
       await this.unload()