Welcome Telegram bot source

# -*- coding: utf-8 -*-
# ------------------------------------------------------------
#  Welcome Telegram bot  |  Built by Filtor (filtori.com)
# ------------------------------------------------------------
#  This is the simplest possible example:
#   - sends a welcome message on the /start command
#   - echoes back any text message the user sends
#  Written using only the requests library, with no other dependency.
#
#  Note: a Telegram bot must run on a server that has access
#     to api.telegram.org.
#
#  Full illustrated guide:
#     https://filtori.com/en/telegram-bot-source/welcome-bot/
#  Need a professional, custom version? Call: +98 912 287 4862
#  Or message us on Telegram: https://t.me/filtori
# ------------------------------------------------------------

import time
import requests

# 1) Get your bot token from @BotFather in Telegram and paste it here.
TOKEN = "PASTE_YOUR_BOT_TOKEN_HERE"

# Telegram API base address
BASE = f"https://api.telegram.org/bot{TOKEN}"


def send_message(chat_id, text):
    """Send a text message to the user."""
    url = f"{BASE}/sendMessage"
    data = {"chat_id": chat_id, "text": text}
    try:
        requests.post(url, json=data, timeout=15)
    except requests.RequestException as error:
        print("Error sending message:", error)


def get_updates(offset):
    """Fetch new messages using long polling."""
    url = f"{BASE}/getUpdates"
    params = {"offset": offset, "timeout": 30}
    try:
        response = requests.get(url, params=params, timeout=40)
        return response.json()
    except requests.RequestException as error:
        print("Error fetching messages:", error)
        return {"ok": False, "result": []}


def main():
    print("Filtor welcome bot is running... (press Ctrl+C to stop)")
    offset = 0  # id of the last update we processed

    while True:
        updates = get_updates(offset)

        if not updates.get("ok"):
            time.sleep(2)  # on error, wait a bit and try again
            continue

        for update in updates.get("result", []):
            offset = update["update_id"] + 1

            message = update.get("message")
            if not message:
                continue

            chat_id = message["chat"]["id"]
            text = message.get("text", "")

            if text == "/start":
                send_message(
                    chat_id,
                    "Hi 👋 Welcome to our bot!\n"
                    "Whatever you type, I will send it right back to you.\n"
                    "This bot was built with ❤️ by Filtor: filtori.com",
                )
            elif text:
                send_message(chat_id, f"You said: {text}")

        time.sleep(0.5)


if __name__ == "__main__":
    main()