Setting the visible_file_name causes an error.

[Dexus77]

Please answer these questions before submitting your issue. Thanks!

1. What version of pyTelegramBotAPI are you using?
   4.20.0
2. What OS are you using?
   Ubuntu
3. What version of python are you using?
   python3.12

I am trying to send files and specify the file name, here is my attempt:

file_obj = io.BytesIO(file_bytes)
file_obj.name = file_name
document = types.InputFile(file_obj)
await bot.send_document(document=document, **kwargs)```


I will receive the file but with a random name, this is because

# types.py line: 7747 
return file, service_utils.generate_random_token()


I tried to specify the file name in the visible_file_name parameter, but an error occurs. If this is not a bug, please advise how to send BytesIO with the specified name.

await bot.send_document(document=document, visible_file_name=file_name, **kwargs)


(asyncio_helper.py:103 MainThread) ERROR - TeleBot: "Unknown error: TypeError"
ERROR:TeleBot:Unknown error: TypeError
Traceback (most recent call last):
await bot.send_document(document=document, visible_file_name=file_name, **kwargs)
File "/home/app/.local/lib/python3.12/site-packages/telebot/async_telebot.py", line 4007, in send_document
await asyncio_helper.send_data(
File "/home/app/.local/lib/python3.12/site-packages/telebot/asyncio_helper.py", line 996, in send_data
return await _process_request(token, method_url, params=payload, files=files, method='post')
File "/home/app/.local/lib/python3.12/site-packages/telebot/asyncio_helper.py", line 105, in _process_request
raise RequestTimeout("Request timeout. Request: method={0} url={1} params={2} files={3} request_timeout={4}".format(method, url, params, files, request_timeout, current_try))
telebot.asyncio_helper.RequestTimeout: Request timeout. Request: method=post url=sendDocument params=<aiohttp.formdata.FormData object at 0x7ed8eddb44a0> files={'document': ('560.pdf', <telebot.types.InputFile object at 0x7ed8f0b6c380>)} request_timeout=300

'''

[Badiboy]

await bot.send_document(document=document

Wat about passing chat_id?...

[Badiboy]

My working code:

            attach = telebot.types.InputFile(io.BytesIO(encoded_bytes))
            bot.send_document(
                chat_id, attach,
                caption="zzz",
                visible_file_name="myfile.hex")

[Dexus77]

Thank you for the quick response, chat_id is passed in kwargs, everything is fine there. The problem seems to be only in the asynchronous version of the bot.

python3.12/site-packages/aiohttp/formdata.py", line 159, in _gen_form_data
raise TypeError(
TypeError: Can not serialize value type: <class 'telebot.types.InputFile'>
headers: {}
value: <telebot.types.InputFile object at 0x101db8320>
2024-06-23 07:33:22,227 (asyncio_helper.py:105 MainThread) ERROR - TeleBot: "Unknown error: TypeError"

My test code:

import asyncio
import io
from telebot.async_telebot import AsyncTeleBot, types
import logging

logging.basicConfig(
    level=logging.DEBUG,
    format='%(asctime)s - %(name)s - %(levelname)s - %(message)s'
)

API_TOKEN = ""

bot = AsyncTeleBot(API_TOKEN)

@bot.message_handler()
async def msg_send_file(message: types.Message):
    chat_id = message.chat.id
    file_content = "This is a test file."
    encoded_bytes = file_content.encode("utf-8")

    attach = types.InputFile(io.BytesIO(encoded_bytes))

    await bot.send_document(
        chat_id=chat_id, document=attach, caption="zzz", visible_file_name="myfile.hex"
    )

async def main():
    await bot.polling(non_stop=False, request_timeout=300, interval=1) 

if __name__ == "__main__":
    asyncio.run(main())

[Dexus77]

For me, probably the most expected behavior is the correct handling of the file name in BytesIO. For now, I have made a patch on the class InputFile and send it without the visible_file_name parameter, and it works well. As soon as I add visible_file_name, it still has the problems described above. Most likely, aiohttp receives InputFile in the payload, but expects some kind of byte object, and since it does not know how to process InputFile, it fails.

types.py

4:     from io import IOBase, BytesIO

7746:         elif isinstance(file, BytesIO):
                  return file, file.name
              elif isinstance(file, IOBase):
                  return file, service_utils.generate_random_token()

[coder2020official]

I have received your bug report and will investigate this issue soon

[coder2020official]

Can confirm that using InputFile for BytesIO files causes a random file name to be generated.
I propose this workaround until I add file_name parameter as optional to InputFile:

    file_input = InputFile(io.BytesIO(downloaded_file))
    file_input.file_name = 'new_file_name.png'
    await bot.send_document(message.chat.id, file_input)

[Dexus77]

file_input.file_name - works in asynchronous mode, thank you

[coder2020official]

Also, sync seems to be handling this differently: file name is totally ignored