detect file name

tgram/tgbot.py

@@ -11,7 +11,7 @@
 from .methods import TelegramBotMethods
 from .decorators import Decorators
 from .errors import APIException
-from .utils import API_URL
+from .utils import API_URL, get_file_name
 from .sync import wrap
 from concurrent.futures.thread import ThreadPoolExecutor
 
@@ -155,7 +155,9 @@ async def _send_request(self, method: str, **kwargs) -> Any:
                 )
             else:
                 value = str(value)
-            data.add_field(key, value)
+            data.add_field(
+                key, value, filename=get_file_name(value) if has_files else None
+            )
 
         response = await session.request(
             "POST" if has_files else "GET",

tgram/utils.py

@@ -1,7 +1,15 @@
 from .handlers import Handlers
 
+import os
+
 API_URL = "https://api.telegram.org/"
 ALL_UPDATES = [
     getattr(Handlers, i)
     for i in filter(lambda x: not x.startswith("_"), Handlers.__dict__)
 ]
+
+
+def get_file_name(obj):
+    name = getattr(obj, "name", None)
+    if name and isinstance(name, str) and name[0] != "<" and name[-1] != ">":
+        return os.path.basename(name)