feat: Enhance error handling in server responses by including request IDs and detailed error codes; improve frontend modal components for better accessibility and user experience

backend/server.js

@@ -125,7 +125,8 @@ function sendOk(res, meta) {
 }
 
 function sendError(res, status, message, code, details) {
-  return res.status(status).json({ message, code, details });
+  const requestId = res.req?.id;
+  return res.status(status).json({ code, message, details, requestId });
 }
 
 // Map UI resource -> S3 key (for history endpoints)
@@ -460,7 +461,7 @@ app.post('/api/domains', async (req, res) => {
         res.send('File updated successfully');
     } catch (error) {
         console.error(error);
-        res.status(500).send('Error writing to S3');
+        return sendError(res, 500, 'Error writing to S3', 'E_S3');
     }
 });
 
@@ -516,7 +517,7 @@ app.get('/api/asns', async (req, res) => {
             res.json([]);
         } else {
             console.error(error);
-            res.status(500).send('Error reading from S3');
+            return sendError(res, 500, 'Error reading from S3', 'E_S3');
         }
     }
 });
@@ -607,7 +608,7 @@ app.get('/api/domains-new', async (req, res) => {
             res.json([]); // Return empty array if file does not exist
         } else {
             console.error(error);
-            res.status(500).send('Error reading from S3');
+            return sendError(res, 500, 'Error reading from S3', 'E_S3');
         }
     }
 });
@@ -698,7 +699,7 @@ app.get('/api/ip-ranges', async (req, res) => {
             res.json([]); // Return empty array if file does not exist
         } else {
             console.error(error);
-            res.status(500).send('Error reading from S3');
+            return sendError(res, 500, 'Error reading from S3', 'E_S3');
         }
     }
 });
@@ -779,7 +780,7 @@ app.get('/api/communities', async (req, res) => {
             return res.json([]);
         }
         console.error('Error reading communities from S3:', error);
-        res.status(500).send('Error reading communities from S3');
+        return sendError(res, 500, 'Error reading communities from S3', 'E_S3');
     }
 });
 
@@ -788,7 +789,7 @@ app.post('/api/communities', async (req, res) => {
     const { communities } = req.body;
 
     if (!Array.isArray(communities)) {
-        return res.status(400).send('communities must be an array');
+        return sendError(res, 400, 'communities must be an array', 'E_BAD_REQUEST');
     }
 
     // Validate entries and ensure unique values
@@ -798,10 +799,10 @@ app.post('/api/communities', async (req, res) => {
         const entry = communities[i] || {};
         const value = typeof entry.value === 'string' ? entry.value.trim() : '';
         if (!value) {
-            return res.status(400).send(`Community at index ${i} is missing required field: value`);
+            return sendError(res, 400, `Community at index ${i} is missing required field: value`, 'E_SCHEMA');
         }
         if (seen.has(value)) {
-            return res.status(400).send(`Duplicate community value at index ${i}: ${value}`);
+            return sendError(res, 400, `Duplicate community value at index ${i}: ${value}`, 'E_SCHEMA');
         }
         seen.add(value);
         normalized.push({
@@ -826,7 +827,7 @@ app.post('/api/communities', async (req, res) => {
         res.send('Communities updated successfully');
     } catch (error) {
         console.error('Error writing communities to S3:', error);
-        res.status(500).send('Error writing communities to S3');
+        return sendError(res, 500, 'Error writing communities to S3', 'E_S3');
     }
 });
 
@@ -861,7 +862,7 @@ app.get('/api/servers', async (req, res) => {
             res.json([]); // Return empty array if file does not exist
         } else {
             console.error(error);
-            res.status(500).send('Error reading from S3');
+            return sendError(res, 500, 'Error reading from S3', 'E_S3');
         }
     }
 });
@@ -872,14 +873,14 @@ app.post('/api/servers', async (req, res) => {
     
     // Validate servers structure
     if (!Array.isArray(servers)) {
-        return res.status(400).send('Servers must be an array');
+        return sendError(res, 400, 'Servers must be an array', 'E_BAD_REQUEST');
     }
     
     // Validate each server has required fields
     for (let i = 0; i < servers.length; i++) {
         const server = servers[i];
         if (!server.ip || !server.dns || !server.country || !server.provider || !server.tunnel) {
-            return res.status(400).send(`Server at index ${i} is missing required fields`);
+            return sendError(res, 400, `Server at index ${i} is missing required fields`, 'E_SCHEMA');
         }
     }
 
@@ -895,7 +896,7 @@ app.post('/api/servers', async (req, res) => {
         res.send('File updated successfully');
     } catch (error) {
         console.error(error);
-        res.status(500).send('Error writing to S3');
+        return sendError(res, 500, 'Error writing to S3', 'E_S3');
     }
 });
 
@@ -930,7 +931,7 @@ app.get('/api/billing', async (req, res) => {
             res.json([]); // Return empty array if file does not exist
         } else {
             console.error(error);
-            res.status(500).send('Error reading from S3');
+            return sendError(res, 500, 'Error reading from S3', 'E_S3');
         }
     }
 });
@@ -941,14 +942,14 @@ app.post('/api/billing', async (req, res) => {
     
     // Validate billing data structure
     if (!Array.isArray(billingData)) {
-        return res.status(400).send('Billing data must be an array');
+        return sendError(res, 400, 'Billing data must be an array', 'E_BAD_REQUEST');
     }
     
     // Validate each billing item has required fields
     for (let i = 0; i < billingData.length; i++) {
         const item = billingData[i];
         if (!item.hostName || !item.country || !item.provider) {
-            return res.status(400).send(`Billing item at index ${i} is missing required fields: hostName, country, provider`);
+            return sendError(res, 400, `Billing item at index ${i} is missing required fields: hostName, country, provider`, 'E_SCHEMA');
         }
     }
 
@@ -964,7 +965,7 @@ app.post('/api/billing', async (req, res) => {
         res.send('File updated successfully');
     } catch (error) {
         console.error(error);
-        res.status(500).send('Error writing to S3');
+        return sendError(res, 500, 'Error writing to S3', 'E_S3');
     }
 });
 
@@ -999,7 +1000,7 @@ app.get('/api/filters', async (req, res) => {
             res.json([]); // Return empty array if file does not exist
         } else {
             console.error(error);
-            res.status(500).send('Error reading from S3');
+            return sendError(res, 500, 'Error reading from S3', 'E_S3');
         }
     }
 });
@@ -1010,14 +1011,14 @@ app.post('/api/filters', async (req, res) => {
     
     // Validate filters structure
     if (!Array.isArray(filters)) {
-        return res.status(400).send('Filters must be an array');
+        return sendError(res, 400, 'Filters must be an array', 'E_BAD_REQUEST');
     }
     
     // Validate each filter has required fields
     for (let i = 0; i < filters.length; i++) {
         const filter = filters[i];
         if (!filter.community || !filter.gateway) {
-            return res.status(400).send(`Filter at index ${i} is missing required fields`);
+            return sendError(res, 400, `Filter at index ${i} is missing required fields`, 'E_SCHEMA');
         }
     }
 
@@ -1033,7 +1034,7 @@ app.post('/api/filters', async (req, res) => {
         res.send('File updated successfully');
     } catch (error) {
         console.error(error);
-        res.status(500).send('Error writing to S3');
+        return sendError(res, 500, 'Error writing to S3', 'E_S3');
     }
 });
 
@@ -1066,7 +1067,7 @@ app.get('/api/s3/last-modified', async (req, res) => {
         res.json(out);
     } catch (error) {
         console.error('Error fetching last modified dates from S3:', error);
-        res.status(500).send('Error fetching last modified dates from S3');
+        return sendError(res, 500, 'Error fetching last modified dates from S3', 'E_S3');
     }
 });
 
@@ -1190,7 +1191,7 @@ app.get('/api/filters/generate-config', async (req, res) => {
             res.json({ config: '// filters.json file not found' });
         } else {
             console.error(error);
-            res.status(500).send('Error generating configuration');
+            return sendError(res, 500, 'Error generating configuration', 'E_S3');
         }
     }
 });
@@ -1252,7 +1253,7 @@ app.post('/api/filters/export-config', async (req, res) => {
         res.json({ success: true, message: 'Конфигурация экспортирована в S3' });
     } catch (error) {
         console.error(error);
-        res.status(500).send('Error exporting configuration');
+        return sendError(res, 500, 'Error exporting configuration', 'E_S3');
     }
 });
 
@@ -1286,7 +1287,7 @@ app.get('/api/server-configs', async (req, res) => {
             res.json([]); // Return empty array if file does not exist
         } else {
             console.error(error);
-            res.status(500).send('Error reading server configs from S3');
+            return sendError(res, 500, 'Error reading server configs from S3', 'E_S3');
         }
     }
 });
@@ -1297,14 +1298,14 @@ app.post('/api/server-configs', async (req, res) => {
     
     // Validate servers structure
     if (!Array.isArray(servers)) {
-        return res.status(400).send('Servers must be an array');
+        return sendError(res, 400, 'Servers must be an array', 'E_BAD_REQUEST');
     }
     
     // Validate each server has required fields
     for (let i = 0; i < servers.length; i++) {
         const server = servers[i];
         if (!server.id || !server.name) {
-            return res.status(400).send(`Server at index ${i} is missing required fields`);
+            return sendError(res, 400, `Server at index ${i} is missing required fields`, 'E_SCHEMA');
         }
     }
 
@@ -1320,7 +1321,7 @@ app.post('/api/server-configs', async (req, res) => {
         res.send('Server configs updated successfully');
     } catch (error) {
         console.error(error);
-        res.status(500).send('Error writing server configs to S3');
+        return sendError(res, 500, 'Error writing server configs to S3', 'E_S3');
     }
 });
 
@@ -1341,7 +1342,7 @@ app.get('/api/server-configs/:serverId', async (req, res) => {
             res.json({ config: '// Конфигурация не найдена' });
         } else {
             console.error(error);
-            res.status(500).send('Error reading server config from S3');
+            return sendError(res, 500, 'Error reading server config from S3', 'E_S3');
         }
     }
 });
@@ -1352,7 +1353,7 @@ app.post('/api/server-configs/:serverId', async (req, res) => {
     const { config } = req.body;
     
     if (!config) {
-        return res.status(400).send('Config is required');
+        return sendError(res, 400, 'Config is required', 'E_BAD_REQUEST');
     }
 
     const params = {
@@ -1367,7 +1368,7 @@ app.post('/api/server-configs/:serverId', async (req, res) => {
         res.send('Server config saved successfully');
     } catch (error) {
         console.error(error);
-        res.status(500).send('Error writing server config to S3');
+        return sendError(res, 500, 'Error writing server config to S3', 'E_S3');
     }
 });
 
@@ -1384,7 +1385,7 @@ app.delete('/api/server-configs/:serverId', async (req, res) => {
         res.send('Server config deleted successfully');
     } catch (error) {
         console.error(error);
-        res.status(500).send('Error deleting server config from S3');
+        return sendError(res, 500, 'Error deleting server config from S3', 'E_S3');
     }
 });
 
@@ -1414,7 +1415,7 @@ app.delete('/api/server-configs/:serverId/complete', async (req, res) => {
         res.send('Server and all associated files deleted successfully');
     } catch (error) {
         console.error(error);
-        res.status(500).send('Error deleting server files from S3');
+        return sendError(res, 500, 'Error deleting server files from S3', 'E_S3');
     }
 });
 
@@ -1449,7 +1450,7 @@ app.get('/api/server-filters/:serverId', async (req, res) => {
             res.json([]); // Return empty array if file does not exist
         } else {
             console.error(error);
-            res.status(500).send('Error reading server filters from S3');
+            return sendError(res, 500, 'Error reading server filters from S3', 'E_S3');
         }
     }
 });
@@ -1497,14 +1498,14 @@ app.post('/api/server-filters/:serverId', async (req, res) => {
     
     // Validate filters structure
     if (!Array.isArray(filters)) {
-        return res.status(400).send('Filters must be an array');
+        return sendError(res, 400, 'Filters must be an array', 'E_BAD_REQUEST');
     }
     
     // Validate each filter has required fields
     for (let i = 0; i < filters.length; i++) {
         const filter = filters[i];
         if (!filter.community || !filter.gateway) {
-            return res.status(400).send(`Filter at index ${i} is missing required fields`);
+            return sendError(res, 400, `Filter at index ${i} is missing required fields`, 'E_SCHEMA');
         }
     }
 
@@ -1520,7 +1521,7 @@ app.post('/api/server-filters/:serverId', async (req, res) => {
         res.send('Server filters updated successfully');
     } catch (error) {
         console.error(error);
-        res.status(500).send('Error writing server filters to S3');
+        return sendError(res, 500, 'Error writing server filters to S3', 'E_S3');
     }
 });
 
@@ -1554,7 +1555,7 @@ app.get('/api/simple-filters', async (req, res) => {
             res.json([]); // Return empty array if file does not exist
         } else {
             console.error(error);
-            res.status(500).send('Error reading simple filters from S3');
+            return sendError(res, 500, 'Error reading simple filters from S3', 'E_S3');
         }
     }
 });
@@ -1565,14 +1566,14 @@ app.post('/api/simple-filters', async (req, res) => {
     
     // Validate filters structure
     if (!Array.isArray(filters)) {
-        return res.status(400).send('Filters must be an array');
+        return sendError(res, 400, 'Filters must be an array', 'E_BAD_REQUEST');
     }
     
     // Validate each filter has required fields
     for (let i = 0; i < filters.length; i++) {
         const filter = filters[i];
         if (!filter.community || !filter.gateway) {
-            return res.status(400).send(`Filter at index ${i} is missing required fields`);
+            return sendError(res, 400, `Filter at index ${i} is missing required fields`, 'E_SCHEMA');
         }
     }
 
@@ -1588,7 +1589,7 @@ app.post('/api/simple-filters', async (req, res) => {
         res.send('Simple filters updated successfully');
     } catch (error) {
         console.error(error);
-        res.status(500).send('Error writing simple filters to S3');
+        return sendError(res, 500, 'Error writing simple filters to S3', 'E_S3');
     }
 });
 
@@ -1616,7 +1617,7 @@ app.get('/api/auto-urls', async (req, res) => {
             res.json([]); // Return empty array if file does not exist
         } else {
             console.error(error);
-            res.status(500).send('Error reading auto URLs from S3');
+            return sendError(res, 500, 'Error reading auto URLs from S3', 'E_S3');
         }
     }
 });
@@ -1714,7 +1715,7 @@ app.post('/api/auto-urls', async (req, res) => {
         res.send('Auto URLs updated successfully');
     } catch (error) {
         console.error(error);
-        res.status(500).send('Error writing auto URLs to S3');
+        return sendError(res, 500, 'Error writing auto URLs to S3', 'E_S3');
     }
 });
 
@@ -1745,7 +1746,7 @@ app.post('/api/auto-urls/process', async (req, res) => {
         }
         
         if (urls.length === 0) {
-            return res.status(400).send('No URLs to process');
+            return sendError(res, 400, 'No URLs to process', 'E_BAD_REQUEST');
         }
         
         // Get current IPs
@@ -1830,7 +1831,7 @@ app.post('/api/auto-urls/process', async (req, res) => {
         
     } catch (error) {
         console.error('Error processing auto URLs:', error);
-        res.status(500).send('Error processing auto URLs');
+        return sendError(res, 500, 'Error processing auto URLs', 'E_S3');
     }
 });
 
@@ -1846,8 +1847,10 @@ app.use((err, req, res, next) => {
   const status = typeof err?.status === 'number' ? err.status : 500;
   const code = err?.code || 'E_INTERNAL';
   const message = status === 500 && process.env.NODE_ENV === 'production' ? 'Internal Server Error' : (err?.message || 'Error');
-  try { console.error('error:', err); } catch {}
-  res.status(status).json({ message, code });
+  const details = err?.details;
+  const requestId = req?.id;
+  try { req.log?.error({ err, code, requestId }, 'request error'); } catch {}
+  res.status(status).json({ code, message, details, requestId });
 });
 
 app.listen(port, () => {