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 +1,114 @@
+import 'dart:convert';
+import '../http_util.dart';
+import '../models.dart';
+import '../sse.dart';
+import 'webview_base_provider.dart';
+
+/// HuggingChat (huggingface.co/chat). Guest REST is blocked; WebView carries cookies.
+class HuggingChat extends WebViewBaseProvider {
+  @override
+  String get name => 'HuggingChat';
+
+  @override
+  bool get working => true;
+
+  @override
+  List<String> get models => [
+        'omni',
+        'meta-llama/Llama-3.1-8B-Instruct',
+        'Qwen/Qwen3.8-27B',
+        'zai-org/GLM-5.3-Flash',
+      ];
+
+  @override
+  String get defaultModel => 'omni';
+
+  @override
+  String get baseUrl => 'https://huggingface.co/chat/';
+
+  @override
+  String get apiEndpoint => 'https://huggingface.co/chat/api/v2/conversations';
+
+  @override
+  String buildJsFetchCode(String model, List<Message> messages, bool stream) {
+    final modelJson = jsonEncode(models.contains(model) ? model : defaultModel);
+    final promptJson = jsonEncode(formatPrompt(messages));
+    return '''
+      (async function() {
+        const headers = {'Content-Type': 'application/json', 'Accept': 'application/json'};
+        let convRes = await fetch('/chat/api/v2/conversations', {
+          method: 'POST',
+          headers,
+          body: JSON.stringify({ model: $modelJson })
+        });
+        if (!convRes.ok) {
+          convRes = await fetch('/chat/conversation', {
+            method: 'POST',
+            headers,
+            body: JSON.stringify({ model: $modelJson })
+          });
+        }
+        if (!convRes.ok) {
+          return JSON.stringify({error: 'HuggingChat login required: ' + convRes.status + ' ' + await convRes.text()});
+        }
+        const conv = await convRes.json();
+        const id = conv.json?.id || conv.id || conv.conversationId;
+        if (!id) return JSON.stringify({error: 'no conversation id', raw: conv});
+
+        const payload = {
+          id: crypto.randomUUID(),
+          inputs: $promptJson,
+          is_retry: false,
+          is_continue: false,
+          web_search: false,
+          tools: []
+        };
+        let msgRes = await fetch('/chat/api/v2/conversations/' + id, {
+          method: 'POST',
+          headers: {'Content-Type': 'application/json', 'Accept': 'text/event-stream'},
+          body: JSON.stringify(payload)
+        });
+        if (!msgRes.ok) {
+          msgRes = await fetch('/chat/conversation/' + id, {
+            method: 'POST',
+            headers: {'Content-Type': 'application/json', 'Accept': 'text/event-stream'},
+            body: JSON.stringify(payload)
+          });
+        }
+        const body = await msgRes.text();
+        return JSON.stringify({status: msgRes.status, body});
+      })();
+    ''';
+  }
+
+  @override
+  String parseResponse(String rawResponse) {
+    try {
+      final json = jsonDecode(rawResponse);
+      if (json is Map && json['error'] != null) {
+        throw Exception(json['error']);
+      }
+      final body = json is Map ? (json['body']?.toString() ?? rawResponse) : rawResponse;
+      final sse = extractAllSseContent(body).join();
+      if (looksLikeModelOutput(sse)) return sse;
+      // chat-ui tokens: {"type":"stream","token":"..."}
+      final tokens = <String>[];
+      for (final line in body.split('\n')) {
+        try {
+          final m = jsonDecode(line);
+          if (m is Map) {
+            final token = m['token'] ?? m['text'] ?? m['generated_text'];
+            if (token is String && token.isNotEmpty) tokens.add(token);
+          }
+        } catch (_) {}
+      }
+      final joined = tokens.join();
+      if (looksLikeModelOutput(joined)) return joined;
+      if (looksLikeModelOutput(body)) return body.trim();
+      throw Exception('HuggingChat unusable: ${body.substring(0, body.length.clamp(0, 180))}');
+    } catch (e) {
+      if (looksLikeModelOutput(rawResponse)) return rawResponse.trim();
+      throw Exception('Failed to parse HuggingChat: $e');
+    }
+  }
+}