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 '../http_util.dart';
+import '../models.dart';
+import 'base_provider.dart';
+
+/// Port of g4f HuggingSpace / CohereForAI C4AI Command (HF Space).
+class CohereSpace extends BaseProvider {
+  @override
+  String get name => 'CohereSpace';
+
+  @override
+  bool get working => true;
+
+  @override
+  List<String> get models => [
+        'command-a-03-2025',
+        'command-r-plus-08-2024',
+        'command-r-08-2024',
+      ];
+
+  @override
+  String get defaultModel => 'command-a-03-2025';
+
+  static const _url = 'https://coherelabs-c4ai-command.hf.space';
+
+  @override
+  Stream<String> createAsyncGenerator(
+    String model,
+    List<Message> messages, {
+    bool stream = false,
+  }) async* {
+    final useModel = models.contains(model) ? model : defaultModel;
+    final headers = browserHeaders(
+      origin: _url,
+      referer: '$_url/',
+      contentType: 'application/json',
+    );
+    final conv = await g4fHttp
+        .post(
+          Uri.parse('$_url/conversation'),
+          headers: headers,
+          body: jsonEncode({
+            'model': useModel,
+            'preprompt': extractSystemMessage(messages),
+          }),
+        )
+        .timeout(const Duration(seconds: 15));
+    if (conv.statusCode != 200) {
+      throw Exception('CohereSpace conv ${conv.statusCode}');
+    }
+    final convJson = jsonDecode(conv.body);
+    final convId = (convJson is Map
+            ? (convJson['conversationId'] ?? convJson['id'])
+            : null)
+        ?.toString();
+    if (convId == null) throw Exception('CohereSpace no conversation');
+
+    final cookie = cookieHeaderFromSetCookie(conv.headers['set-cookie']);
+    final req = http.MultipartRequest('POST', Uri.parse('$_url/conversation/$convId'));
+    req.headers.addAll({
+      ...browserHeaders(origin: _url, referer: '$_url/'),
+      if (cookie != null) 'Cookie': cookie,
+    });
+    req.fields['data'] = jsonEncode({
+      'inputs': formatPrompt(messages.where((m) => m.role != Role.system).toList()),
+      'id': 0,
+      'is_retry': false,
+      'is_continue': false,
+      'web_search': false,
+      'tools': [],
+    });
+
+    final res = await g4fHttp.send(req).timeout(requestTimeout);
+      if (res.statusCode != 200) {
+        throw Exception('CohereSpace chat ${res.statusCode}');
+      }
+      final raw = utf8.decode(await res.stream.toBytes().timeout(requestTimeout));
+      final buf = StringBuffer();
+      for (final line in raw.split(RegExp(r'\r?\n'))) {
+        if (line.trim().isEmpty) continue;
+        try {
+          final data = jsonDecode(line);
+          if (data is Map) {
+            if (data['type'] == 'stream' && data['token'] is String) {
+              buf.write((data['token'] as String).replaceAll('\u0000', ''));
+            } else if (data['type'] == 'finalAnswer' && data['text'] is String) {
+              if (buf.isEmpty) buf.write(data['text']);
+            }
+          }
+        } catch (_) {}
+      }
+      final text = buf.toString().trim();
+    if (!looksLikeModelOutput(text)) throw Exception('CohereSpace empty');
+    yield text;
+  }
+}