Added upstream dns timeout

lib/l10n/app_en.arb

@@ -803,5 +803,8 @@
     "myOtherApps": "My other apps",
     "myOtherAppsDescription": "Check my other apps, make a donation, contact support, and more",
     "topToBottom": "From top to bottom",
-    "bottomToTop": "From bottom to top"
+    "bottomToTop": "From bottom to top",
+    "upstreamTimeout": "Upstream timeout",
+    "upstreamTimeoutHelper": "Specifies the number of seconds to wait for a response from the upstream server",
+    "fieldCannotBeEmpty": "This field cannot be empty"
 }

lib/l10n/app_es.arb

@@ -803,5 +803,8 @@
     "myOtherApps": "Mis otras apps",
     "myOtherAppsDescription": "Comprueba mis otras apps, hacer una donación, contactar al soporte, y más",
     "topToBottom": "Desde arriba hacia abajo",
-    "bottomToTop": "Desde abajo hacia arriba"
+    "bottomToTop": "Desde abajo hacia arriba",
+    "upstreamTimeout": "Tiempo de espera del upstream",
+    "upstreamTimeoutHelper": "Especifica el número de segundos que se debe esperar para recibir una respuesta del servidor upstream",
+    "fieldCannotBeEmpty": "El campo no puede estar vacío"
 }

lib/models/dns_info.dart

@@ -26,6 +26,7 @@ class DnsInfo {
   int? ratelimitSubnetLenIpv4;
   int? ratelimitSubnetLenIpv6;
   List<String>? ratelimitWhitelist;
+  int? upstreamTimeout;
 
   DnsInfo({
     required this.upstreamDns,
@@ -55,6 +56,7 @@ class DnsInfo {
     required this.ratelimitSubnetLenIpv4,
     required this.ratelimitSubnetLenIpv6,
     required this.ratelimitWhitelist,
+    required this.upstreamTimeout,
   });
 
   factory DnsInfo.fromJson(Map<String, dynamic> json) => DnsInfo(
@@ -85,6 +87,7 @@ class DnsInfo {
     ratelimitSubnetLenIpv4: json["ratelimit_subnet_len_ipv4"],
     ratelimitSubnetLenIpv6: json["ratelimit_subnet_len_ipv6"],
     ratelimitWhitelist:  json["ratelimit_whitelist"] != null ? List<String>.from(json["ratelimit_whitelist"].map((x) => x)) : [],
+    upstreamTimeout: json["upstream_timeout"],
   );
 
   Map<String, dynamic> toJson() => {
@@ -115,5 +118,6 @@ class DnsInfo {
     "ratelimit_subnet_len_ipv4": ratelimitSubnetLenIpv4,
     "ratelimit_subnet_len_ipv6": ratelimitSubnetLenIpv6,
     "ratelimit_whitelist": ratelimitWhitelist != null ? List<String>.from(ratelimitWhitelist!.map((x) => x)) : null,
+    "upstream_timeout": upstreamTimeout,
   };
 }

lib/screens/settings/dns/upstream_dns.dart

@@ -1,5 +1,3 @@
-// ignore_for_file: use_build_context_synchronously
-
 import 'dart:io';
 
 import 'package:flutter/material.dart';
@@ -30,6 +28,9 @@ class _UpstreamDnsScreenState extends State<UpstreamDnsScreen> {
 
   bool validValues = false;
 
+  final upstreamTimeoutController = TextEditingController();
+  String? upstreamTimeoutError = null;
+
   checkValidValues() {
     if (
       dnsServers.isNotEmpty &&
@@ -61,6 +62,7 @@ class _UpstreamDnsScreenState extends State<UpstreamDnsScreen> {
       }
     }
     upstreamMode = dnsProvider.dnsInfo!.upstreamMode ?? "";
+    upstreamTimeoutController.text = dnsProvider.dnsInfo!.upstreamTimeout != null ? dnsProvider.dnsInfo!.upstreamTimeout.toString() : "";
     validValues = true;
     super.initState();
   }
@@ -72,6 +74,23 @@ class _UpstreamDnsScreenState extends State<UpstreamDnsScreen> {
     
     final width = MediaQuery.of(context).size.width;
 
+    void validateTimeout(String value) {
+      if (value != '' && int.tryParse(value) != null && int.parse(value) > 0) {
+        setState(() {
+          upstreamTimeoutError = null;
+          validValues = true;
+        });
+      }
+      else {
+        setState(() {
+          upstreamTimeoutError = value == ''
+            ? AppLocalizations.of(context)!.fieldCannotBeEmpty
+            : AppLocalizations.of(context)!.invalidValue;
+          validValues = false;
+        });
+      }
+    }
+
     void openAddCommentModal() {
       if (width > 900 || !(Platform.isAndroid || Platform.isIOS)) {
         showDialog(
@@ -146,11 +165,13 @@ class _UpstreamDnsScreenState extends State<UpstreamDnsScreen> {
 
       final result = await dnsProvider.saveUpstreamDnsConfig({
         "upstream_dns": dnsServers.map((e) => e['controller'] != null ? e['controller'].text : e['comment']).toList(),
-        "upstream_mode": upstreamMode
+        "upstream_mode": upstreamMode,
+        "upstream_timeout": int.tryParse(upstreamTimeoutController.text)
       });
 
       processModal.close();
 
+      if (!context.mounted) return;
       if (result.successful == true) {
         showSnackbar(
           appConfigProvider: appConfigProvider,
@@ -312,6 +333,27 @@ class _UpstreamDnsScreenState extends State<UpstreamDnsScreen> {
               subtitle: AppLocalizations.of(context)!.fastestIpAddressDescription,
               onChanged: (value) => setState(() => upstreamMode = value),
             ),
+            const SizedBox(height: 16),
+            SectionLabel(label: AppLocalizations.of(context)!.others),
+            Padding(
+              padding: const EdgeInsets.all(16),
+              child: TextFormField(
+                controller: upstreamTimeoutController,
+                onChanged: validateTimeout,
+                decoration: InputDecoration(
+                  prefixIcon: const Icon(Icons.timer_rounded),
+                  border: const OutlineInputBorder(
+                    borderRadius: BorderRadius.all(
+                      Radius.circular(10)
+                    )
+                  ),
+                  labelText: AppLocalizations.of(context)!.upstreamTimeout,
+                  helperText: AppLocalizations.of(context)!.upstreamTimeoutHelper,
+                  helperMaxLines: 2,
+                  errorText: upstreamTimeoutError
+                )
+              ),
+            ),
           ],
         ),
       ),