echobot.py

#
# Modified echo example of https://github.com/python-telegram-bot
#
# - print message in the terminal
# - send back echo message in the telegram channel
# 

import logging

from telegram import ForceReply, Update
from telegram.ext import Application, CommandHandler, ContextTypes, MessageHandler, filters

TOKEN = '{YOUR_TOKEN_HERE}'

# Enable logging
logging.basicConfig(
    format="%(asctime)s - %(name)s - %(levelname)s - %(message)s", level=logging.INFO
)
# set higher logging level for httpx to avoid all GET and POST requests being logged
logging.getLogger("httpx").setLevel(logging.WARNING)

logger = logging.getLogger(__name__)


# Define a few command handlers. These usually take the two arguments update and
# context.
async def start(update: Update, context: ContextTypes.DEFAULT_TYPE) -> None:
    """Send a message when the command /start is issued."""
    user = update.effective_user
    await update.message.reply_html(
        rf"Hi {user.mention_html()}!",
        reply_markup=ForceReply(selective=True),
    )


async def help_command(update: Update, context: ContextTypes.DEFAULT_TYPE) -> None:
    """Send a message when the command /help is issued."""
    await update.message.reply_text("Help!")

async def echo(update: Update, context: ContextTypes.DEFAULT_TYPE) -> None:
    """Handle both direct messages and channel posts and print the text in the terminal."""
    # If the update contains a channel post, reply to the channel post text
    if update.channel_post and update.channel_post.text:
        text = update.channel_post.text
        chat_id = update.channel_post.chat.id

        # Print to the terminal
        print(f"Channel post received from {chat_id}: {text}")

        # Reply by sending a message to the channel
        await context.bot.send_message(chat_id=chat_id, text=text)

    # Otherwise, check for a standard message
    elif update.message and update.message.text:
        text = update.message.text
        chat_id = update.message.chat.id

        # Print to the terminal
        print(f"Message received from {chat_id}: {text}")

        # Reply directly to the message
        await update.message.reply_text(text)

    else:
        # Log details for debugging when neither type is found
        logger.warning(f"Received update without recognizable message content: {update.to_dict()}")

def main() -> None:
    """Start the bot."""
    # Create the Application and pass it your bot's token.
    application = Application.builder().token(TOKEN).build()

    # on different commands - answer in Telegram
    application.add_handler(CommandHandler("start", start))
    application.add_handler(CommandHandler("help", help_command))

    # on non command i.e message - echo the message on Telegram
    application.add_handler(MessageHandler(filters.TEXT & ~filters.COMMAND, echo))

    # Run the bot until the user presses Ctrl-C
    application.run_polling(allowed_updates=Update.ALL_TYPES)


if __name__ == "__main__":
    main()