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 'dart:math';
+import 'package:crypto/crypto.dart';
+import 'package:http/http.dart' as http;
+import '../http_client.dart';
+import '../models.dart';
+import '../sse.dart';
+import 'base_provider.dart';
+
+class ChatGptOss extends BaseProvider {
+  @override
+  String get name => 'ChatGptOss';
+
+  @override
+  bool get working => true;
+
+  @override
+  List<String> get models => ['gpt-oss-120b', 'gpt-5-nano'];
+
+  @override
+  String get defaultModel => 'gpt-oss-120b';
+
+  String _generateFingerprint() {
+    final seed = '${DateTime.now().millisecondsSinceEpoch / 1000.0}-${Random().nextDouble()}';
+    return md5.convert(utf8.encode(seed)).toString();
+  }
+
+  @override
+  Stream<String> createAsyncGenerator(
+    String model,
+    List<Message> messages, {
+    bool stream = false,
+  }) async* {
+    final prompt = formatPrompt(messages);
+    final url = Uri.parse('https://chat-gpt-oss.com/api/message');
+
+    final payload = {
+      "conversation_id": null,
+      "model": model,
+      "content": prompt,
+      "reasoning_effort": "low",
+    };
+
+    final req = http.Request('POST', url);
+    req.headers.addAll({
+      "accept": "text/event-stream",
+      "accept-language": "en-US,en;q=0.9",
+      "cache-control": "no-cache",
+      "content-type": "application/json",
+      "origin": "https://chat-gpt-oss.com",
+      "pragma": "no-cache",
+      "referer": "https://chat-gpt-oss.com/",
+      "sec-ch-ua": '"Chromium";v="148", "Google Chrome";v="148", "Not/A)Brand";v="99"',
+      "sec-ch-ua-mobile": "?0",
+      "sec-ch-ua-platform": '"Linux"',
+      "sec-fetch-dest": "empty",
+      "sec-fetch-mode": "cors",
+      "sec-fetch-site": "same-origin",
+      "user-agent": "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/148.0.0.0 Safari/537.36",
+      "x-fingerprint": _generateFingerprint(),
+    });
+    
+    req.body = jsonEncode(payload);
+    
+    final response = await g4fHttp.send(req);
+
+    if (response.statusCode == 200) {
+        String? currentEvent;
+        await for (final line in splitSseLines(response.stream.transform(utf8.decoder))) {
+          final trimmed = line.trim();
+          if (trimmed.isEmpty) {
+            currentEvent = null;
+            continue;
+          }
+          if (trimmed.startsWith('event:')) {
+            currentEvent = trimmed.substring(6).trim();
+            if (currentEvent == 'summary') {
+              return;
+            }
+            continue;
+          }
+          if (trimmed.startsWith('data:') && currentEvent == 'message') {
+            final dataStr = trimmed.substring(5).trim();
+            if (dataStr.isEmpty) continue;
+            try {
+              final jsonChunk = jsonDecode(dataStr);
+              final content = jsonChunk['content'] as String?;
+              if (content != null && content.isNotEmpty) {
+                yield content;
+              }
+            } catch (_) {}
+          }
+        }
+    } else {
+      throw Exception('$name returned status ${response.statusCode}');
+    }
+  }
+}