Add Tor support for Ethereum, fix clearnet image loads in Tor mode

lib/networking/tor_aware_network_image.dart

@@ -0,0 +1,123 @@
+import 'dart:async';
+import 'dart:convert';
+import 'dart:ui' as ui;
+
+import 'package:flutter/foundation.dart';
+import 'package:flutter/widgets.dart';
+import 'package:flutter_svg/flutter_svg.dart';
+
+import '../app_config.dart';
+import '../services/tor_service.dart';
+import '../utilities/prefs.dart';
+import 'http.dart';
+
+/// Fetches [url] through the app's [HTTP] client, routing over Tor when it is
+/// enabled. Throws if Tor is enabled but not connected, so nothing falls back
+/// to clearnet.
+Future<Uint8List> fetchTorAwareBytes(String url) async {
+  final response = await const HTTP().get(
+    url: Uri.parse(url),
+    proxyInfo: !AppConfig.hasFeature(AppFeature.tor)
+        ? null
+        : Prefs.instance.useTor
+        ? TorService.sharedInstance.getProxyInfo()
+        : null,
+  );
+
+  if (response.code != 200) {
+    throw Exception("Failed to load $url: status=${response.code}");
+  }
+
+  return Uint8List.fromList(response.bodyBytes);
+}
+
+/// Drop-in replacement for [NetworkImage] that respects the Tor preference.
+/// Use with [Image] instead of [Image.network], which always goes clearnet.
+@immutable
+class TorAwareNetworkImage extends ImageProvider<TorAwareNetworkImage> {
+  const TorAwareNetworkImage(this.url);
+
+  final String url;
+
+  @override
+  Future<TorAwareNetworkImage> obtainKey(ImageConfiguration configuration) =>
+      SynchronousFuture<TorAwareNetworkImage>(this);
+
+  @override
+  ImageStreamCompleter loadImage(
+    TorAwareNetworkImage key,
+    ImageDecoderCallback decode,
+  ) {
+    final chunkEvents = StreamController<ImageChunkEvent>();
+    return MultiFrameImageStreamCompleter(
+      codec: _load(key, decode, chunkEvents),
+      chunkEvents: chunkEvents.stream,
+      scale: 1.0,
+      debugLabel: key.url,
+    );
+  }
+
+  Future<ui.Codec> _load(
+    TorAwareNetworkImage key,
+    ImageDecoderCallback decode,
+    StreamController<ImageChunkEvent> chunkEvents,
+  ) async {
+    try {
+      // Lets loadingBuilder show its indicator while the request runs.
+      chunkEvents.add(
+        const ImageChunkEvent(
+          cumulativeBytesLoaded: 0,
+          expectedTotalBytes: null,
+        ),
+      );
+      final bytes = await fetchTorAwareBytes(key.url);
+      final buffer = await ui.ImmutableBuffer.fromUint8List(bytes);
+      return await decode(buffer);
+    } catch (_) {
+      // Don't keep a failed load in the cache.
+      scheduleMicrotask(() {
+        PaintingBinding.instance.imageCache.evict(key);
+      });
+      rethrow;
+    } finally {
+      unawaited(chunkEvents.close());
+    }
+  }
+
+  @override
+  bool operator ==(Object other) =>
+      other is TorAwareNetworkImage && other.url == url;
+
+  @override
+  int get hashCode => url.hashCode;
+
+  @override
+  String toString() =>
+      "${objectRuntimeType(this, "TorAwareNetworkImage")}"
+      "(\"$url\")";
+}
+
+/// Drop-in replacement for the loader behind [SvgPicture.network] that
+/// respects the Tor preference.
+/// Use as `SvgPicture(TorAwareSvgNetworkLoader(url))`.
+@immutable
+class TorAwareSvgNetworkLoader extends SvgLoader<Uint8List> {
+  const TorAwareSvgNetworkLoader(this.url);
+
+  final String url;
+
+  @override
+  Future<Uint8List?> prepareMessage(BuildContext? context) =>
+      fetchTorAwareBytes(url);
+
+  @override
+  String provideSvg(Uint8List? message) =>
+      utf8.decode(message!, allowMalformed: true);
+
+  @override
+  bool operator ==(Object other) =>
+      other is TorAwareSvgNetworkLoader && other.url == url;
+
+  @override
+  int get hashCode => url.hashCode;
+}

lib/pages/add_wallet_views/add_token_view/sub_widgets/add_token_list_element.dart

@@ -16,6 +16,7 @@ import 'package:isar_community/isar.dart';
 import '../../../../models/isar/exchange_cache/currency.dart';
 import '../../../../models/isar/models/contract.dart';
 import '../../../../models/isar/models/ethereum/eth_contract.dart';
+import '../../../../networking/tor_aware_network_image.dart';
 import '../../../../services/exchange/change_now/change_now_exchange.dart';
 import '../../../../services/exchange/exchange_data_loading_service.dart';
 import '../../../../themes/stack_colors.dart';
@@ -101,8 +102,8 @@ class _AddTokenListElementState extends ConsumerState<AddTokenListElement> {
                 )
               else
                 currency != null
-                    ? SvgPicture.network(
-                        currency!.image,
+                    ? SvgPicture(
+                        TorAwareSvgNetworkLoader(currency!.image),
                         width: iconSize,
                         height: iconSize,
                         placeholderBuilder: (_) =>

lib/pages/add_wallet_views/add_wallet_view/sub_widgets/coin_select_item.dart

@@ -19,6 +19,7 @@ import '../../../../models/add_wallet_list_entity/add_wallet_list_entity.dart';
 import '../../../../models/add_wallet_list_entity/sub_classes/eth_token_entity.dart';
 import '../../../../models/add_wallet_list_entity/sub_classes/sol_token_entity.dart';
 import '../../../../models/isar/exchange_cache/currency.dart';
+import '../../../../networking/tor_aware_network_image.dart';
 import '../../../../providers/providers.dart';
 import '../../../../services/exchange/change_now/change_now_exchange.dart';
 import '../../../../services/exchange/exchange_data_loading_service.dart';
@@ -146,15 +147,15 @@ class _CoinSelectItemState extends ConsumerState<CoinSelectItem> {
               else
                 tokenImageUri != null
                     ? tokenImageUri!.toLowerCase().endsWith(".svg")
-                          ? SvgPicture.network(
-                              tokenImageUri!,
+                          ? SvgPicture(
+                              TorAwareSvgNetworkLoader(tokenImageUri!),
                               width: 26,
                               height: 26,
                               placeholderBuilder: (_) =>
                                   const AppIcon(width: 26, height: 26),
                             )
-                          : Image.network(
-                              tokenImageUri!,
+                          : Image(
+                              image: TorAwareNetworkImage(tokenImageUri!),
                               width: 26,
                               height: 26,
                               errorBuilder: (_, _, _) => SvgPicture.file(

lib/pages/cakepay/cakepay_card_detail_view.dart

@@ -3,6 +3,7 @@ import 'package:flutter/gestures.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 
+import '../../networking/tor_aware_network_image.dart';
 import '../../providers/global/locale_provider.dart';
 import '../../services/cakepay/cakepay_service.dart';
 import '../../services/cakepay/src/models/card.dart';
@@ -340,8 +341,8 @@ class _CardImage extends StatelessWidget {
       ),
       child: ClipRRect(
         borderRadius: BorderRadius.circular(8),
-        child: Image.network(
-          imageUrl,
+        child: Image(
+          image: TorAwareNetworkImage(imageUrl),
           width: isDesktop ? 300 : null,
           fit: isDesktop ? .contain : .fitWidth,
           loadingBuilder: (_, child, event) {

lib/pages/cakepay/cakepay_vendors_view.dart

@@ -2,6 +2,7 @@ import 'package:dropdown_button2/dropdown_button2.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_svg/flutter_svg.dart';
 
+import '../../networking/tor_aware_network_image.dart';
 import '../../services/cakepay/cakepay_service.dart';
 import '../../services/cakepay/src/models/card.dart';
 import '../../themes/stack_colors.dart';
@@ -87,9 +88,8 @@ class _CakePayVendorsViewState extends State<CakePayVendorsView> {
   }
 
   Future<void> _onCardTapped(CakePayCard card) async {
-    await Navigator.of(
-      context,
-    ).pushNamed(CakePayCardDetailView.routeName, arguments: card);
+    await Navigator.of(context)
+        .pushNamed(CakePayCardDetailView.routeName, arguments: card);
   }
 
   @override
@@ -130,9 +130,9 @@ class _CakePayVendorsViewState extends State<CakePayVendorsView> {
         condition: !isDesktop,
         builder: (child) => Background(
           child: Scaffold(
-            backgroundColor: Theme.of(
-              context,
-            ).extension<StackColors>()!.background,
+            backgroundColor: Theme.of(context)
+                .extension<StackColors>()!
+                .background,
             appBar: AppBar(
               leading: AppBarBackButton(
                 onPressed: () => Navigator.of(context).pop(),
@@ -210,9 +210,9 @@ class _CakePayVendorsViewState extends State<CakePayVendorsView> {
                           child: Text(
                             "No items",
                             style: STextStyles.w500_14(context).copyWith(
-                              color: Theme.of(
-                                context,
-                              ).extension<StackColors>()!.textSubtitle1,
+                              color: Theme.of(context)
+                                  .extension<StackColors>()!
+                                  .textSubtitle1,
                             ),
                           ),
                         ),
@@ -226,9 +226,9 @@ class _CakePayVendorsViewState extends State<CakePayVendorsView> {
                               Text(
                                 error.toString(),
                                 style: STextStyles.w500_14(context).copyWith(
-                                  color: Theme.of(
-                                    context,
-                                  ).extension<StackColors>()!.textSubtitle1,
+                                  color: Theme.of(context)
+                                      .extension<StackColors>()!
+                                      .textSubtitle1,
                                 ),
                               ),
                               const SizedBox(height: 16),
@@ -276,9 +276,9 @@ class _SearchField extends StatelessWidget {
         focusNode: focusNode,
         style: isDesktop
             ? STextStyles.desktopTextExtraSmall(context).copyWith(
-                color: Theme.of(
-                  context,
-                ).extension<StackColors>()!.textFieldActiveText,
+                color: Theme.of(context)
+                    .extension<StackColors>()!
+                    .textFieldActiveText,
               )
             : STextStyles.field(context),
         decoration:
@@ -327,9 +327,8 @@ class _CountryDropdown extends StatelessWidget {
     );
 
     final itemStyle = isDesktop
-        ? STextStyles.desktopTextExtraSmall(
-            context,
-          ).copyWith(color: colors.textFieldActiveText)
+        ? STextStyles.desktopTextExtraSmall(context)
+              .copyWith(color: colors.textFieldActiveText)
         : STextStyles.w500_14(context);
 
     return ClipRRect(
@@ -341,9 +340,8 @@ class _CountryDropdown extends StatelessWidget {
           hint: Text(
             "All countries",
             style: isDesktop
-                ? STextStyles.desktopTextExtraSmall(
-                    context,
-                  ).copyWith(color: colors.textFieldDefaultSearchIconLeft)
+                ? STextStyles.desktopTextExtraSmall(context)
+                      .copyWith(color: colors.textFieldDefaultSearchIconLeft)
                 : STextStyles.fieldLabel(context),
           ),
           items: [
@@ -446,8 +444,8 @@ class _CardTile extends StatelessWidget {
           ClipRRect(
             borderRadius: BorderRadius.circular(4),
             child: card.cardImageUrl != null
-                ? Image.network(
-                    card.cardImageUrl!,
+                ? Image(
+                    image: TorAwareNetworkImage(card.cardImageUrl!),
                     width: isDesktop ? 60 : 48,
                     height: isDesktop ? 40 : 32,
                     fit: BoxFit.cover,
@@ -483,9 +481,8 @@ class _CardTile extends StatelessWidget {
                   ].join(' '),
                   style: isDesktop
                       ? STextStyles.desktopTextExtraExtraSmall(context)
-                      : STextStyles.itemSubtitle12(
-                          context,
-                        ).copyWith(color: colors.textSubtitle1),
+                      : STextStyles.itemSubtitle12(context)
+                            .copyWith(color: colors.textSubtitle1),
                 ),
               ],
             ),