1from telegram.ext import MessageHandler, ApplicationBuilder, filters
 2from telegram import Update
 3from dotenv import load_dotenv
 4from os import getenv
 5import logging
 6
 7async def forward(update: Update, _):
 8    if not update.effective_chat.id == CHANNEL_ID:
 9        return logger.info("Ignoring message since it did not come from the correct chat_id.")
10    
11    if update.channel_post is None:
12        return logger.warn("Got an invalid message from the correct chat_id.")
13    
14    await update.channel_post.forward(GROUP_ID)
15    return logger.info("Forwarded a message.")
16
17def config_error():
18    logger.error("Please create and fill the .env file.")
19    exit(1)
20
21if __name__ == "__main__":
22    logging.basicConfig(format='%(asctime)s - %(name)s - %(levelname)s - %(message)s', level=logging.INFO)
23    logger = logging.getLogger(__name__)
24    load_dotenv()
25    
26    try:
27        TOKEN = str(getenv("token"))
28        GROUP_ID = int(getenv("group_id"))
29        CHANNEL_ID = int(getenv("channel_id"))
30    except TypeError:
31        config_error()
32    
33    if '' in [TOKEN, GROUP_ID, CHANNEL_ID]:
34        config_error()
35    
36    application = ApplicationBuilder().token(TOKEN).build()
37    application.add_handler(MessageHandler(filters.ChatType.CHANNEL, forward))
38    application.run_polling()