feat: Add new endpoint to fetch last modified dates of S3 files and update Dashboard to display this information

backend/server.js

@@ -126,6 +126,23 @@ app.post('/api/asns', async (req, res) => {
     }
 });
 
+// Новый эндпоинт для получения дат последнего изменения файлов S3
+app.get('/api/s3/last-modified', async (req, res) => {
+    try {
+        const [domainsHead, asnsHead] = await Promise.all([
+            s3.headObject({ Bucket: BUCKET_NAME, Key: 'domains.txt' }).promise(),
+            s3.headObject({ Bucket: BUCKET_NAME, Key: 'asns.txt' }).promise()
+        ]);
+        res.json({
+            domainsLastModified: domainsHead.LastModified ? domainsHead.LastModified.toISOString() : null,
+            asnsLastModified: asnsHead.LastModified ? asnsHead.LastModified.toISOString() : null
+        });
+    } catch (error) {
+        console.error(error);
+        res.status(500).send('Error fetching last modified dates from S3');
+    }
+});
+
 // The "catchall" handler: for any request that doesn't
 // match one above, send back React's index.html file.
 app.get('*', (req, res) => {