Added blocked response ttl field

lib/l10n/app_en.arb

@@ -710,5 +710,8 @@
     "fallbackDnsServers": "Fallback DNS servers",
     "fallbackDnsServersDescription": "Configure fallback DNS servers",
     "fallbackDnsServersInfo": "List of fallback DNS servers used when upstream DNS servers are not responding. The syntax is the same as in the main upstreams field above.",
-    "noFallbackDnsAdded": "No fallback DNS servers added."
+    "noFallbackDnsAdded": "No fallback DNS servers added.",
+    "blockedResponseTtl": "Blocked response TTL",
+    "blockedResponseTtlDescription": "Specifies for how many seconds the clients should cache a filtered response",
+    "invalidValue": "Invalid value"
 }

lib/l10n/app_es.arb

@@ -710,5 +710,8 @@
     "fallbackDnsServers": "Servidores DNS alternativos",
     "fallbackDnsServersDescription": "Configura los servidores DNS alternativos",
     "fallbackDnsServersInfo": "Lista de servidores DNS alternativos utilizados cuando los servidores DNS de subida no responden. La sintaxis es la misma que en el campo de los principales DNS de subida anterior.",
-    "noFallbackDnsAdded": "No hay servidores DNS alternativos añadidos."
+    "noFallbackDnsAdded": "No hay servidores DNS alternativos añadidos.",
+    "blockedResponseTtl": "Respuesta TTL bloqueada",
+    "blockedResponseTtlDescription": "Especifica durante cuántos segundos los clientes deben almacenar en cache una respuesta filtrada",
+    "invalidValue": "Valor no válido"
 }

lib/models/dns_info.dart

@@ -22,6 +22,7 @@ class DnsInfo {
   String blockingIpv4;
   String blockingIpv6;
   List<String> defaultLocalPtrUpstreams;
+  int? blockedResponseTtl;
 
   DnsInfo({
     required this.upstreamDns,
@@ -47,6 +48,7 @@ class DnsInfo {
     required this.blockingIpv4,
     required this.blockingIpv6,
     required this.defaultLocalPtrUpstreams,
+    required this.blockedResponseTtl,
   });
 
   factory DnsInfo.fromJson(Map<String, dynamic> json) => DnsInfo(
@@ -73,6 +75,7 @@ class DnsInfo {
     blockingIpv4: json["blocking_ipv4"],
     blockingIpv6: json["blocking_ipv6"],
     defaultLocalPtrUpstreams: json["default_local_ptr_upstreams"] != null ? List<String>.from(json["default_local_ptr_upstreams"].map((x) => x)) : [],
+    blockedResponseTtl: json["blocked_response_ttl"]
   );
 
   Map<String, dynamic> toJson() => {
@@ -99,5 +102,6 @@ class DnsInfo {
     "blocking_ipv4": blockingIpv4,
     "blocking_ipv6": blockingIpv6,
     "default_local_ptr_upstreams": List<dynamic>.from(defaultLocalPtrUpstreams.map((x) => x)),
+    "blocked_response_ttl": blockedResponseTtl
   };
 }

lib/providers/dns_provider.dart

@@ -161,6 +161,7 @@ class DnsProvider with ChangeNotifier {
       data.blockingMode = value['blocking_mode'];
       data.blockingIpv4 = value['blocking_ipv4'];
       data.blockingIpv6 = value['blocking_ipv6'];
+      data.blockedResponseTtl = value['blocked_response_ttl'];
       setDnsInfoData(data);
       return result;
     }

lib/screens/settings/dns/dns_server_settings.dart

@@ -41,6 +41,9 @@ class _DnsServerSettingsScreenState extends State<DnsServerSettingsScreen> {
   final TextEditingController ipv6controller = TextEditingController();
   String? ipv6error;
 
+  final _ttlController = TextEditingController();
+  String? _ttlError;
+
   bool isDataValid = false;
 
   void validateIpv4(String value) {
@@ -90,7 +93,8 @@ class _DnsServerSettingsScreenState extends State<DnsServerSettingsScreen> {
           ipv6error == null
         )
       ) == true && 
-      ednsIpError == null
+      ednsIpError == null && 
+      _ttlError == null
     ) {
       setState(() => isDataValid = true);
     }
@@ -99,6 +103,17 @@ class _DnsServerSettingsScreenState extends State<DnsServerSettingsScreen> {
     }
   }
 
+  void validateNumber(String value) {
+    final regex = RegExp(r'^(\d)+$');
+     if (regex.hasMatch(value) == true) {
+      setState(() => _ttlError = null);
+    }
+    else {
+      setState(() => _ttlError = AppLocalizations.of(context)!.invalidValue);
+    }
+    validateData();
+  }
+
   @override
   void initState() {
     final dnsProvider = Provider.of<DnsProvider>(context, listen: false);
@@ -115,6 +130,9 @@ class _DnsServerSettingsScreenState extends State<DnsServerSettingsScreen> {
     ipv4controller.text = dnsProvider.dnsInfo!.blockingIpv4;
     ipv6controller.text = dnsProvider.dnsInfo!.blockingIpv6;
     isDataValid = true;
+    _ttlController.text = dnsProvider.dnsInfo!.blockedResponseTtl != null
+      ? dnsProvider.dnsInfo!.blockedResponseTtl.toString()
+      : "";
     super.initState();
   }
 
@@ -137,7 +155,8 @@ class _DnsServerSettingsScreenState extends State<DnsServerSettingsScreen> {
         "disable_ipv6": disableIpv6Resolving,
         "blocking_mode": blockingMode,
         "blocking_ipv4": ipv4controller.text,
-        "blocking_ipv6": ipv6controller.text
+        "blocking_ipv6": ipv6controller.text,
+        "blocked_response_ttl": int.parse(_ttlController.text)
       });
 
       processModal.close();
@@ -392,8 +411,28 @@ class _DnsServerSettingsScreenState extends State<DnsServerSettingsScreen> {
                   keyboardType: TextInputType.number,
                 ),
               ),
-              const SizedBox(height: 30)
-            ]
+              const SizedBox(height: 30),
+            ],
+            Padding(
+              padding: const EdgeInsets.all(16),
+              child: TextFormField(
+                controller: _ttlController,
+                onChanged: validateNumber,
+                decoration: InputDecoration(
+                  prefixIcon: const Icon(Icons.timer_rounded),
+                  border: const OutlineInputBorder(
+                    borderRadius: BorderRadius.all(
+                      Radius.circular(10)
+                    )
+                  ),
+                  errorText: _ttlError,
+                  labelText: AppLocalizations.of(context)!.blockedResponseTtl,
+                  helperText: AppLocalizations.of(context)!.blockedResponseTtlDescription,
+                  helperMaxLines: 2,
+                ),
+                keyboardType: TextInputType.number,
+              ),
+            ),
           ],
         ),
       ),