From 9ed002c87902cd707836ebdca819ea91b4ec42cd Mon Sep 17 00:00:00 2001
From: "Arthur Pacaud (arthuro555)" <arthur.pacaud@hotmail.fr>
Date: Mon, 15 Jan 2024 14:00:14 +0100
Subject: [PATCH] Add expression to read the authenticated user unique
 identifier (#6192)

* This is useful if you want to interface with a third party or in-house solution to store user data.
---
 Extensions/PlayerAuthentication/JsExtension.js  | 17 +++++++++++++++++
 .../playerauthenticationtools.ts                |  2 +-
 2 files changed, 18 insertions(+), 1 deletion(-)

diff --git a/Extensions/PlayerAuthentication/JsExtension.js b/Extensions/PlayerAuthentication/JsExtension.js
index 49477e8b48..19a68d8843 100644
--- a/Extensions/PlayerAuthentication/JsExtension.js
+++ b/Extensions/PlayerAuthentication/JsExtension.js
@@ -169,6 +169,23 @@ module.exports = {
       )
       .setFunctionName('gdjs.playerAuthentication.getUsername');
 
+    extension
+      .addStrExpression(
+        'UserID',
+        _('User ID'),
+        _('Get the unique user ID of the authenticated player.'),
+        '',
+        'JsPlatform/Extensions/authentication.svg'
+      )
+      .getCodeExtraInformation()
+      .setIncludeFile(
+        'Extensions/PlayerAuthentication/playerauthenticationcomponents.js'
+      )
+      .addIncludeFile(
+        'Extensions/PlayerAuthentication/playerauthenticationtools.js'
+      )
+      .setFunctionName('gdjs.playerAuthentication.getUserId');
+
     extension
       .addCondition(
         'IsPlayerAuthenticated',
diff --git a/Extensions/PlayerAuthentication/playerauthenticationtools.ts b/Extensions/PlayerAuthentication/playerauthenticationtools.ts
index 547f704a93..a5f1e9c38b 100644
--- a/Extensions/PlayerAuthentication/playerauthenticationtools.ts
+++ b/Extensions/PlayerAuthentication/playerauthenticationtools.ts
@@ -171,7 +171,7 @@ namespace gdjs {
       if (!_checkedLocalStorage) {
         readAuthenticatedUserFromLocalStorage();
       }
-      return _userId || null;
+      return _userId || '';
     };
 
     /**