Implement batch user retrieval in AdminController and update routes

- Added a new method `getUsers` in AdminController to handle batch retrieval of user information based on hashed IDs.
- Updated adminRouter to include a new route for batch user retrieval.
- Enhanced AdminService with a method to fetch user details by hashed IDs, ensuring proper access control.
- Updated localization files to include the new "username" field for user connections in both German and English.
- Modified ServicesStatusView to utilize the new batch user retrieval for displaying usernames alongside connection counts.

backend/controllers/adminController.js

@@ -27,6 +27,7 @@ class AdminController {
         // User administration
         this.searchUsers = this.searchUsers.bind(this);
         this.getUser = this.getUser.bind(this);
+        this.getUsers = this.getUsers.bind(this);
         this.updateUser = this.updateUser.bind(this);
 
         // Rights
@@ -74,6 +75,30 @@ class AdminController {
         }
     }
 
+    async getUsers(req, res) {
+        try {
+            const { userid: requester } = req.headers;
+            let { ids } = req.query;
+            if (!ids) {
+                return res.status(400).json({ error: 'ids query parameter is required' });
+            }
+            // Unterstütze sowohl Array-Format (ids[]=...) als auch komma-separierten String (ids=...)
+            let hashedIds;
+            if (Array.isArray(ids)) {
+                hashedIds = ids;
+            } else if (typeof ids === 'string') {
+                hashedIds = ids.split(',').map(id => id.trim()).filter(id => id.length > 0);
+            } else {
+                return res.status(400).json({ error: 'ids must be an array or comma-separated string' });
+            }
+            const result = await AdminService.getUsersByHashedIds(requester, hashedIds);
+            res.status(200).json(result);
+        } catch (error) {
+            const status = error.message === 'noaccess' ? 403 : 500;
+            res.status(status).json({ error: error.message });
+        }
+    }
+
     async updateUser(req, res) {
         try {
             const { userid: requester } = req.headers;

backend/routers/adminRouter.js

@@ -18,6 +18,7 @@ router.delete('/chat/rooms/:id', authenticate, adminController.deleteRoom);
 // --- Users Admin ---
 router.get('/users/search', authenticate, adminController.searchUsers);
 router.get('/users/statistics', authenticate, adminController.getUserStatistics);
+router.get('/users/batch', authenticate, adminController.getUsers);
 router.get('/users/:id', authenticate, adminController.getUser);
 router.put('/users/:id', authenticate, adminController.updateUser);
 

backend/services/adminService.js

@@ -441,6 +441,30 @@ class AdminService {
         return { id: user.hashedId, username: user.username, active: user.active, registrationDate: user.registrationDate };
     }
 
+    async getUsersByHashedIds(requestingHashedUserId, targetHashedIds) {
+        if (!(await this.hasUserAccess(requestingHashedUserId, 'useradministration'))) {
+            throw new Error('noaccess');
+        }
+        if (!Array.isArray(targetHashedIds) || targetHashedIds.length === 0) {
+            return [];
+        }
+        const users = await User.findAll({
+            where: { hashedId: { [Op.in]: targetHashedIds } },
+            attributes: ['id', 'hashedId', 'username', 'active', 'registrationDate']
+        });
+        // Erstelle ein Map für schnellen Zugriff
+        const userMap = {};
+        users.forEach(user => {
+            userMap[user.hashedId] = {
+                id: user.hashedId,
+                username: user.username,
+                active: user.active,
+                registrationDate: user.registrationDate
+            };
+        });
+        return userMap;
+    }
+
     async updateUser(requestingHashedUserId, targetHashedId, data) {
         if (!(await this.hasUserAccess(requestingHashedUserId, 'useradministration'))) {
             throw new Error('noaccess');