DNS overrides

lib/foundation/appdata.dart

@@ -123,6 +123,8 @@ class _Settings with ChangeNotifier {
     'ignoreCertificateErrors': false,
     'authorizationRequired': false,
     'onClickFavorite': 'viewDetail', // viewDetail, read
+    'enableDnsOverrides': false,
+    'dnsOverrides': {},
   };
 
   operator [](String key) {

lib/foundation/js_engine.dart

@@ -58,6 +58,11 @@ class JsEngine with _JSEngineApi {
     JsEngine().init();
   }
 
+  void resetDio() {
+    _dio = AppDio(BaseOptions(
+        responseType: ResponseType.plain, validateStatus: (status) => true));
+  }
+
   Future<void> init() async {
     if (!_closed) {
       return;
@@ -198,7 +203,8 @@ class JsEngine with _JSEngineApi {
               ..findProxy = (uri) => proxy == null ? "DIRECT" : "PROXY $proxy";
           },
         );
-        dio.interceptors.add(CookieManagerSql(SingleInstanceCookieJar.instance!));
+        dio.interceptors
+            .add(CookieManagerSql(SingleInstanceCookieJar.instance!));
         dio.interceptors.add(LogInterceptor());
       }
       response = await dio!.request(req["url"],

lib/network/app_dio.dart

@@ -222,6 +222,22 @@ class AppDio with DioMixin {
 class RHttpAdapter implements HttpClientAdapter {
   rhttp.ClientSettings settings;
 
+  static Map<String, List<String>> _getOverrides() {
+    if (!appdata.settings['enableDnsOverrides'] == true) {
+      return {};
+    }
+    var config = appdata.settings["dnsOverrides"];
+    var result = <String, List<String>>{};
+    if (config is Map) {
+      for (var entry in config.entries) {
+        if (entry.key is String && entry.value is String) {
+          result[entry.key] = [entry.value];
+        }
+      }
+    }
+    return result;
+  }
+
   RHttpAdapter([this.settings = const rhttp.ClientSettings()]) {
     settings = settings.copyWith(
       redirectSettings: const rhttp.RedirectSettings.limited(5),
@@ -234,6 +250,7 @@ class RHttpAdapter implements HttpClientAdapter {
       tlsSettings: rhttp.TlsSettings(
         verifyCertificates: !AppDio.ignoreCertificateErrors,
       ),
+      dnsSettings: rhttp.DnsSettings.static(overrides: _getOverrides()),
     );
   }
 

lib/pages/settings/network.dart

@@ -17,6 +17,10 @@ class _NetworkSettingsState extends State<NetworkSettings> {
           title: "Proxy".tl,
           builder: () => const _ProxySettingView(),
         ).toSliver(),
+        _PopupWindowSetting(
+          title: "DNS Overrides".tl,
+          builder: () => const _DNSOverrides(),
+        ).toSliver(),
         _SliderSetting(
           title: "Download Threads".tl,
           settingsIndex: 'downloadThreads',
@@ -100,7 +104,8 @@ class _ProxySettingViewState extends State<_ProxySettingView> {
   void initState() {
     var proxy = appdata.settings['proxy'];
     parseProxyString(proxy);
-    ignoreCertificateErrors = appdata.settings['ignoreCertificateErrors'] ?? false;
+    ignoreCertificateErrors =
+        appdata.settings['ignoreCertificateErrors'] ?? false;
     super.initState();
   }
 
@@ -153,7 +158,8 @@ class _ProxySettingViewState extends State<_ProxySettingView> {
                 setState(() {
                   ignoreCertificateErrors = v;
                 });
-                appdata.settings['ignoreCertificateErrors'] = ignoreCertificateErrors;
+                appdata.settings['ignoreCertificateErrors'] =
+                    ignoreCertificateErrors;
                 appdata.saveData();
               },
             ),
@@ -250,3 +256,135 @@ class _ProxySettingViewState extends State<_ProxySettingView> {
     ).paddingHorizontal(16).paddingTop(16);
   }
 }
+
+class _DNSOverrides extends StatefulWidget {
+  const _DNSOverrides();
+
+  @override
+  State<_DNSOverrides> createState() => __DNSOverridesState();
+}
+
+class __DNSOverridesState extends State<_DNSOverrides> {
+  var overrides = <(String, String)>[];
+
+  @override
+  void initState() {
+    for (var entry in (appdata.settings['dnsOverrides'] as Map).entries) {
+      if (entry.key is String && entry.value is String) {
+        overrides.add((entry.key, entry.value));
+      }
+    }
+    super.initState();
+  }
+
+  @override
+  void dispose() {
+    var map = <String, String>{};
+    for (var entry in overrides) {
+      map[entry.$1] = entry.$2;
+    }
+    appdata.settings['dnsOverrides'] = map;
+    appdata.saveData();
+    JsEngine().resetDio();
+    super.dispose();
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return PopUpWidgetScaffold(
+      title: "DNS Overrides".tl,
+      body: SingleChildScrollView(
+        child: Column(
+          children: [
+            _SwitchSetting(
+              title: "Enable DNS Overrides".tl,
+              settingKey: "enableDnsOverrides",
+            ),
+            const SizedBox(height: 8),
+            Container(
+              height: 1,
+              margin: EdgeInsets.symmetric(horizontal: 8),
+              color: context.colorScheme.outlineVariant,
+            ),
+            for (var i = 0; i < overrides.length; i++) buildOverride(i),
+            const SizedBox(height: 8),
+            TextButton.icon(
+              onPressed: () {
+                setState(() {
+                  overrides.add(('', ''));
+                });
+              },
+              icon: const Icon(Icons.add),
+              label: Text("Add".tl),
+            ),
+          ],
+        ),
+      ),
+    );
+  }
+
+  Widget buildOverride(int index) {
+    var entry = overrides[index];
+    return Container(
+      height: 48,
+      margin: EdgeInsets.symmetric(horizontal: 8),
+      decoration: BoxDecoration(
+        border: Border(
+          bottom: BorderSide(
+            color: context.colorScheme.outlineVariant,
+          ),
+          left: BorderSide(
+            color: context.colorScheme.outlineVariant,
+          ),
+          right: BorderSide(
+            color: context.colorScheme.outlineVariant,
+          ),
+        ),
+      ),
+      child: Row(
+        children: [
+          Expanded(
+            child: TextField(
+              decoration: InputDecoration(
+                border: InputBorder.none,
+                hintText: "Domain".tl,
+              ),
+              controller: TextEditingController(text: entry.$1),
+              onChanged: (v) {
+                overrides[index] = (v, entry.$2);
+              },
+            ).paddingHorizontal(8),
+          ),
+          Container(
+            width: 1,
+            color: context.colorScheme.outlineVariant,
+          ),
+          Expanded(
+            child: TextField(
+              decoration: InputDecoration(
+                border: InputBorder.none,
+                hintText: "IP".tl,
+              ),
+              controller: TextEditingController(text: entry.$2),
+              onChanged: (v) {
+                overrides[index] = (entry.$1, v);
+              },
+            ).paddingHorizontal(8),
+          ),
+          Container(
+            width: 1,
+            color: context.colorScheme.outlineVariant,
+          ),
+          IconButton(
+            icon: const Icon(Icons.delete_outline),
+            onPressed: () {
+              setState(() {
+                overrides.removeAt(index);
+              });
+            },
+          ),
+        ],
+      ),
+    );
+  }
+}

lib/pages/settings/settings_page.dart

@@ -12,6 +12,7 @@ import 'package:venera/foundation/appdata.dart';
 import 'package:venera/foundation/cache_manager.dart';
 import 'package:venera/foundation/comic_source/comic_source.dart';
 import 'package:venera/foundation/favorites.dart';
+import 'package:venera/foundation/js_engine.dart';
 import 'package:venera/foundation/local.dart';
 import 'package:venera/foundation/log.dart';
 import 'package:venera/network/app_dio.dart';