UkrzalInfo translator bot

tbot.py

from telethon import TelegramClient, events
from telethon.tl.types import PeerUser, PeerChat, PeerChannel
import os
import sys

from google.cloud import translate_v3 as translate

os.environ["GOOGLE_APPLICATION_CREDENTIALS"] = "/path/key.json"
gclient = translate.TranslationServiceClient()

def translate(text):
    response = gclient.translate_text(
        request={
            "parent": "projects/xxx-1234",
            "contents": [text],
            "mime_type": "text/plain",
            "source_language_code": "uk",
            "target_language_code": "en"
            }
        )
    return response.translations[0].translated_text

CHAN_UKRZALINFO=1419524556
CHAN_TEMP=1234
CHAN_TRANSLATED=4567

# Message flow:
# Standard user joins the UkrzalInfo channel and listens for messages. Seen messages are forwarded to temp channel
# Bot user is added to temp channel and on message will forward it to translated channel + reply with translation

async def handlemsg(event):
    if not isinstance(event.message.peer_id, PeerChannel):
        return

    # normal user
    if event.message.peer_id.channel_id == CHAN_UKRZALINFO:
        print(event.stringify())
        await tgcli.forward_messages(CHAN_TEMP, event.message.id, event.message.peer_id);

    # bot
    if event.message.peer_id.channel_id == CHAN_TEMP:
        print(event.stringify())
        ret = await tgcli.forward_messages(CHAN_TRANSLATED, event.message.id, event.message.peer_id);
        t2 = translate(event.message.message);
        await tgcli.send_message(entity=CHAN_TRANSLATED, message=t2, reply_to=ret.id);


def main():
    global tgcli
    if sys.argv[1] == 'user':
        print("start user")
        tgcli = TelegramClient('User', 1234, 'a1b2c3').start(phone='+35812345678')
        tgcli.add_event_handler(handlemsg, events.NewMessage)
        tgcli.run_until_disconnected()
    elif sys.argv[1] == 'bot':
        print("start bot")
        tgcli = TelegramClient('xbot', 1234, 'a1b2c3').start(bot_token='1234:ABCD')
        tgcli.add_event_handler(handlemsg, events.NewMessage)
        tgcli.run_until_disconnected()
    print("exiting")

if __name__ == '__main__':
    main()