add renew function

templates/folder_secret_config_editor.html

@@ -208,6 +208,15 @@
         cloneBtn.addEventListener('click', () => cloneRec(key));
         actions.appendChild(cloneBtn);
 
+        if (isEdit || expired) {
+          const renewBtn = document.createElement('button');
+          renewBtn.className = 'btn btn-info btn-sm me-2';
+          renewBtn.type = 'button';
+          renewBtn.textContent = 'erneuern';
+          renewBtn.addEventListener('click', () => renewRec(key));
+          actions.appendChild(renewBtn);
+        }
+
         if (isEdit) {
           const saveBtn = document.createElement('button');
           saveBtn.className = 'btn btn-success btn-sm';
@@ -260,6 +269,38 @@
       editing.add(rec.secret);
       render();
     }
+    async function renewRec(secret) {
+      // find current record
+      const rec = data.find(r => r.secret === secret);
+      if (!rec) return;
+
+      // generate a fresh unique secret
+      const existing = data.map(r => r.secret);
+      const newSecret = generateSecret(existing);
+
+      // validity = today + 35 days, formatted as YYYY-MM-DD
+      const future = new Date();
+      future.setDate(future.getDate() + 35);
+      const yyyy = future.getFullYear();
+      const mm = String(future.getMonth() + 1).padStart(2, '0');
+      const dd = String(future.getDate()).padStart(2, '0');
+      const validity = `${yyyy}-${mm}-${dd}`;
+
+      // keep folders unchanged
+      const folders = rec.folders.map(f => ({
+        foldername: f.foldername,
+        folderpath: f.folderpath
+      }));
+
+      // persist via existing endpoint
+      await sendAction({
+        action: 'update',
+        oldSecret: secret,
+        newSecret,
+        validity,
+        folders
+      });
+    }
     function addFolder(secret) {
       data.find(r => r.secret === secret).folders.push({foldername:'', folderpath:''});
       render();