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