server.py

import threading
import socket

host = "127.0.0.1"
port = 55555

admin_password = input("Please enter the password of the admin: ")

server = socket.socket(socket.AF_INET6, socket.SOCK_STREAM)
server.bind((host, port))
server.listen()

clients = []
nicknames = []

def broadcast(message):
    for client in clients:
        client.send(message)

def handle(client):
    while True:
        try:
            msg = message = client.recv(1024)
            if msg.decode("ascii").startswith("KICK"):
                if nicknames[clients.index(client)] == "admin":
                    name_to_kick = msg.decode("ascii")[5:]
                    kick_user(name_to_kick)
                else:
                    client.send("You do not have permission!".encode("acii"))
            elif msg.decode("ascii").startswith("BAN"):
                if nicknames[clients.index(client)] == "admin":
                    name_to_ban = msg.decode("ascii")[4:]
                    kick_user(name_to_ban)
                    with open("bans.txt", "a") as f:
                        f.write(f"{name_to_ban}\n")
                    print(f"{name_to_ban} was banned!")
                else:
                    client.send("You do not have permission!".encode("acii"))
            else:
                broadcast(message)
        except:
            if client in clients:
                index = clients.index(client)
                clients.remove(client)
                client.close()
                nickname = nicknames[index]
                broadcast(f"{nickname} left the chat!".encode("ascii"))
                nicknames.remove(nickname)
                break

def receive():
    while True:
        client, address = server.accept()
        print(f"Connected with {str(address)}")

        client.send("NICK".encode("ascii"))

        nickname = client.recv(1024).decode("ascii")

        with open("bans.txt", "r") as f:
            bans = f.readlines()

        if nickname+"\n" in bans:
            client.send("BAN".encode("ascii"))
            client.close()
            continue

        if nickname == "admin":
            client.send("PASS".encode("ascii"))
            password = client.recv(1024).decode("ascii")

            if password != admin_password:
                client.send("REFUSE".encode("ascii"))
                client.close()
                continue

        nicknames.append(nickname)
        clients.append(client)

        print(f"Nickname of the client is {nickname}!")
        broadcast(f"{nickname} joined the chat!".encode("ascii"))

        thread = threading.Thread(target=handle, args=(client,))
        thread.start()

def kick_user(name):
    if name in nicknames:
        name_index = nicknames.index(name)
        client_to_kick = clients[name_index]
        clients.remove(client_to_kick)
        client_to_kick.send("You have been kicked!".encode("ascii"))
        client_to_kick.close()
        nicknames.remove(name)
        broadcast(f"{name} was kicked!".encode("ascii"))

print(f"Server started on {port}!")
receive()