Fix chat stream response on multiline content json

app/lib/backend/http/api/messages.dart

@@ -114,7 +114,7 @@ Stream<ServerMessageChunk> sendMessageStreamServer(String text, {String? appId})
         }
 
         if (line.startsWith('done: ')) {
-          var text = line.substring(6);
+          var text = utf8.decode(base64.decode(line.substring(6)));
           debugPrint(text);
           yield ServerMessageChunk(messageId, text, MessageChunkType.done,
               message: ServerMessage.fromJson(json.decode(text)));
@@ -177,14 +177,14 @@ Stream<ServerMessageChunk> sendVoiceMessageStreamServer(List<File> files) async*
         }
 
         if (line.startsWith('done: ')) {
-          var text = line.substring(6);
+          var text = utf8.decode(base64.decode(line.substring(6)));
           yield ServerMessageChunk(messageId, text, MessageChunkType.done,
               message: ServerMessage.fromJson(json.decode(text)));
           continue;
         }
 
         if (line.startsWith('message: ')) {
-          var text = line.substring(9);
+          var text = utf8.decode(base64.decode(line.substring(9)));
           yield ServerMessageChunk(messageId, text, MessageChunkType.message,
               message: ServerMessage.fromJson(json.decode(text)));
           continue;

backend/routers/chat.py

@@ -1,6 +1,7 @@
 import uuid
 import re
 import json
+import base64
 from datetime import datetime, timezone
 from typing import List, Optional
 
@@ -106,7 +107,8 @@ async def generate_stream():
                 ai_message_dict = ai_message.dict()
                 response_message = ResponseMessage(**ai_message_dict)
                 response_message.ask_for_nps = ask_for_nps
-                yield f"done: {response_message.model_dump_json()}\n\n"
+                data = base64.b64encode(bytes(response_message.model_dump_json(), 'utf-8')).decode('utf-8')
+                yield f"done: {data}\n\n"
 
     return StreamingResponse(
         generate_stream(),

backend/utils/chat.py

@@ -1,5 +1,6 @@
 import threading
 import time
+import base64
 import uuid
 from datetime import datetime, timezone
 from typing import List, AsyncGenerator
@@ -111,7 +112,8 @@ def delete_file():
     chat_db.add_message(uid, message.dict())
 
     # stream
-    yield f"message: {message.model_dump_json()}\n\n"
+    mdata = base64.b64encode(bytes(message.model_dump_json(), 'utf-8')).decode('utf-8')
+    yield f"message: {mdata}\n\n"
 
     # not support plugin
     plugin = None
@@ -162,7 +164,8 @@ def process_message(response: str, callback_data: dict):
             ai_message_dict = ai_message.dict()
             response_message = ResponseMessage(**ai_message_dict)
             response_message.ask_for_nps = ask_for_nps
-            yield f"done: {response_message.model_dump_json()}\n\n"
+            data = base64.b64encode(bytes(response_message.model_dump_json(), 'utf-8')).decode('utf-8')
+            yield f"done: {data}\n\n"
 
             # send notification
             token = notification_db.get_token_only(uid)