fix: move temp users to 'user' group when email is confirmed

Temporary users can go through email confirmation which effectively
makes these users registered/permanent users. When email is confirmed
they should be moved to the default group for registered users.

src/backend/src/CoreModule.js

@@ -367,6 +367,9 @@ const install = async ({ services, app, useapi, modapi }) => {
 
     const { ReferralCodeService } = require('./services/ReferralCodeService');
     services.registerService('referral-code', ReferralCodeService);
+
+    const { VerifiedGroupService } = require('./services/VerifiedGroupService');
+    services.registerService('__verified-group', VerifiedGroupService);
     
     const { UserService } = require('./services/UserService');
     services.registerService('user', UserService);

src/backend/src/services/VerifiedGroupService.js

@@ -0,0 +1,28 @@
+const { get_user } = require("../helpers");
+const BaseService = require("./BaseService");
+
+class VerifiedGroupService extends BaseService {
+    async _init () {
+        const config = this.global_config;
+
+        const svc_event = this.services.get('event');
+        svc_event.on('user.email-confirmed', async (_, { user_uid }) => {
+            const user = await get_user({ uuid: user_uid });
+            
+            // Update group
+            const svc_group = this.services.get('group');
+            await svc_group.remove_users({
+                uid: config.default_temp_group,
+                users: [user.username],
+            });
+            await svc_group.add_users({
+                uid: config.default_user_group,
+                users: [user.username]
+            });
+        });
+    }
+}
+
+module.exports = {
+    VerifiedGroupService,
+};