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 +1,98 @@
+import 'dart:convert';
+import 'package:http/http.dart' as http;
+import '../http_client.dart';
+import 'package:uuid/uuid.dart';
+import '../http_util.dart';
+import '../models.dart';
+import '../sse.dart';
+import 'base_provider.dart';
+
+/// Port of g4f.Provider.Liaobots — guest auth code + chat.
+class Liaobots extends BaseProvider {
+  @override
+  String get name => 'Liaobots';
+
+  @override
+  bool get working => true;
+
+  @override
+  List<String> get models => ['gpt-3.5-turbo', 'gpt-4'];
+
+  @override
+  String get defaultModel => 'gpt-3.5-turbo';
+
+  static const _hosts = [
+    'https://liaobots.work',
+    'https://liaobots.site',
+    'https://liaobots.com',
+  ];
+
+  @override
+  Stream<String> createAsyncGenerator(
+    String model,
+    List<Message> messages, {
+    bool stream = false,
+  }) async* {
+    Object? last;
+    for (final host in _hosts) {
+      try {
+        yield await _chat(host, model, messages);
+        return;
+      } catch (e) {
+        last = e;
+      }
+    }
+    throw Exception('Liaobots failed: $last');
+  }
+
+  Future<String> _chat(String host, String model, List<Message> messages) async {
+    final headers = browserHeaders(
+      origin: host,
+      referer: '$host/',
+      contentType: 'application/json',
+    );
+    final login = await g4fHttp
+        .post(
+          Uri.parse('$host/api/user'),
+          headers: headers,
+          body: jsonEncode({'authcode': const Uuid().v4()}),
+        )
+        .timeout(const Duration(seconds: 12));
+    String? auth;
+    if (login.statusCode == 200) {
+      try {
+        final data = jsonDecode(login.body);
+        auth = (data is Map ? (data['authCode'] ?? data['authcode']) : null)
+            ?.toString();
+      } catch (_) {}
+    }
+
+    final req = http.Request('POST', Uri.parse('$host/api/chat'));
+    req.headers.addAll({
+      ...headers,
+      if (auth != null) 'x-auth-code': auth,
+      if (auth != null) 'authorization': auth,
+    });
+    req.body = jsonEncode({
+      'conversationId': const Uuid().v4(),
+      'model': {
+        'id': models.contains(model) ? model : defaultModel,
+        'name': model,
+        'maxLength': 24000,
+        'tokenLimit': 8000,
+      },
+      'messages': toOpenAiMessages(messages),
+      'key': '',
+      'prompt': extractSystemMessage(messages),
+    });
+    final res = await g4fHttp.send(req).timeout(requestTimeout);
+    if (res.statusCode != 200) {
+      throw Exception('Liaobots ${res.statusCode} @ $host');
+    }
+    final raw = utf8.decode(await res.stream.toBytes().timeout(requestTimeout));
+    final sse = extractAllSseContent(raw).join();
+    final text = looksLikeModelOutput(sse) ? sse : raw.trim();
+    if (!looksLikeModelOutput(text)) throw Exception('Liaobots empty @ $host');
+    return text;
+  }
+}