DNS overrides

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()),
     );
   }