feat: embed a Flutter G4F client with Cronet, cookie jar, and origin WebView

Port the Oracle off the Python g4f container onto on-device providers: Chromium HTTP via Cronet, a shared cookie session, IterList retry, hosted OpenAI-compat aggregators, and same-origin WebView fallbacks instead of CORS fetch.
2026-09-01 22:05:38 +05:00
parent f3e7412cf9
commit fbf04d90db
49 changed files with 4856 additions and 92 deletions
@@ -0,0 +1,47 @@
+import 'http_client.dart';
+import 'http_util.dart';
+import 'models.dart';
+import 'providers/base_provider.dart';
+
+/// Port of g4f `IterListProvider`: try each provider until one returns content.
+class IterListProvider {
+  IterListProvider(this.providers);
+
+  final List<BaseProvider> providers;
+
+  Future<String> create({
+    required List<Message> messages,
+    String? model,
+  }) async {
+    final exceptions = <String, Object>{};
+    final ordered = [
+      ...providers.where((p) => p.working && !p.isWebView),
+      ...providers.where((p) => p.working && p.isWebView),
+    ];
+
+    for (final provider in ordered) {
+      final alias = provider.resolveModel(model);
+      try {
+        await warmupOrigin(provider.url);
+        final result = await provider.complete(alias, messages);
+        if (looksLikeModelOutput(result)) {
+          return result.trim();
+        }
+        exceptions[provider.name] = 'unusable text (${result.trim().length} chars)';
+      } catch (e) {
+        exceptions[provider.name] = e;
+        print('Provider ${provider.name} failed: $e');
+      }
+    }
+
+    if (exceptions.isEmpty) {
+      throw Exception('No G4F providers available.');
+    }
+    if (exceptions.length == 1) {
+      throw Exception('${exceptions.keys.first}: ${exceptions.values.first}');
+    }
+    throw Exception(
+      'RetryProvider failed:\n${exceptions.entries.map((e) => '${e.key}: ${e.value}').join('\n')}',
+    );
+  }
+}