Groupchatgopi.py

import tkinter as tk
from tkinter import simpledialog
from tkinter.scrolledtext import ScrolledText
import paho.mqtt.client as mqtt
import json
from datetime import datetime

# Configuration for connecting to an MQTT broker
MQTT_BROKER = "broker.hivemq.com"
MQTT_PORT = 1883
MQTT_TOPIC = "social_platform/group_chat"

# User credentials for demonstration purposes
user_auth = {
    "Gopi": "gopiPass123", 
    "Leo": "leoSecure456", 
    "Daniel": "danielSafe789", 
    "Gurchandan": "gurchandanKey012", 
    "Jaskaran": "jaskaranLock345", 
    "Justice": "justiceGate678"
}

# Validates user login
def user_login():
    global username
    username = simpledialog.askstring("Login", "Username:")
    passcode = simpledialog.askstring("Password", "Password:", show='*')
    
    if username in user_auth and user_auth[username] == passcode:
        print("Access Granted.")
        return True
    else:
        print("Access Denied.")
        return False

# Initializing MQTT client and callback functions setup
client = mqtt.Client()

# Establishing connection with the MQTT broker
try:
    client.connect(MQTT_BROKER, MQTT_PORT, 60)
except Exception as err:
    print(f"Could not connect to broker: {err}")
    exit()

client.loop_start()

# Sends user messages to the chat
def publish_message():
    content = message_entry.get()
    if content.strip():
        data = json.dumps({"user": username, "content": content})
        try:
            client.publish(MQTT_TOPIC, data)
            moment = datetime.now().strftime('%Y-%m-%d %H:%M:%S')
            chat_window.configure(state='normal')
            chat_window.insert(tk.END, f"[{moment}] {username}: {content}\n")
            chat_window.configure(state='disabled')
            message_entry.delete(0, tk.END)
        except Exception as err:
            print(f"Message sending failed: {err}")

# Adds participants to the chat
def include_user():
    popup = tk.Toplevel(root)
    popup.title("Join Chat")

    def join_chat(user_name):
        global username
        username = user_name
        chat_window.configure(state='normal')
        chat_window.insert(tk.END, f"{username} entered the chat.\n")
        chat_window.configure(state='disabled')

    for user in user_auth.keys():
        btn = tk.Button(popup, text=user, command=lambda user=user: join_chat(user))
        btn.pack()

# Setting up the main window
root = tk.Tk()
root.withdraw()  # Main window is hidden initially

if user_login():
    root.deiconify()  # Main window shown after successful login
    root.title("Group Chat")

    chat_window = ScrolledText(root, state='disabled', height=20, width=60)
    chat_window.grid(row=0, column=0, padx=10, pady=10, columnspan=3)
    chat_window.configure(font='TkFixedFont')

    message_entry = tk.Entry(root, width=40)
    message_entry.grid(row=1, column=0, padx=10, pady=10)

    send_btn = tk.Button(root, text="Send", command=publish_message)
    send_btn.grid(row=1, column=1, padx=5, pady=10)

    add_user_btn = tk.Button(root, text="Add User", command=include_user)
    add_user_btn.grid(row=1, column=2, padx=5, pady=10)

    root.mainloop()
else:
    print("Failed to authenticate user.")
    root.destroy()