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locknoteserver.py
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locknoteserver.py
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import socket
import base64
import hashlib
import logging
import argparse
import threading
from datetime import datetime
import cryptography.fernet
from cryptography.fernet import Fernet
from colorama import init, Fore, Style
init(autoreset=True)
clients = {}
clients_lock = threading.Lock()
def log_setup(loglevel, logfile):
numeric_level = getattr(logging, loglevel.upper(), None)
if not isinstance(numeric_level, int):
raise ValueError(f"Invalid log level: {loglevel}")
logging.basicConfig(level=numeric_level,
format="%(asctime)s [%(levelname)s] - %(message)s",
handlers=[logging.FileHandler(logfile),
logging.StreamHandler()])
class ClientHandler(threading.Thread):
def __init__(self, client_socket):
threading.Thread.__init__(self)
self.client_socket = client_socket
self.username = None
def run(self):
global clients
# Ask for and validate the username
while True:
try:
encrypted_prompt = cipher.encrypt("Enter your username: ".encode('utf-8'))
self.client_socket.send(encrypted_prompt)
encrypted_username = self.client_socket.recv(1024)
username = cipher.decrypt(encrypted_username).decode('utf-8').strip()
with clients_lock:
if username in clients or not username:
encrypted_error_msg = cipher.encrypt(
"This username is already taken or invalid. Please enter a different name.".encode('utf-8')
)
self.client_socket.send(encrypted_error_msg)
continue
else:
self.username = username
clients[self.username] = self.client_socket
encrypted_success_msg = cipher.encrypt("Username set successfully.".encode('utf-8'))
self.client_socket.send(encrypted_success_msg)
break
except cryptography.fernet.InvalidToken:
print(Fore.RED + f"Error with client: The encryption key is invalid or data is corrupted.")
logging.info("Error with client: The encryption key is invalid or data is corrupted")
continue
except OSError as e:
print(f"Error: {e}")
logging.info(f"Error: {e}")
except BrokenPipeError as e:
print(f"An unknown error occurred: {e}")
logging.info(f"An unknown error occurred: {e}")
return
# Process messages
try:
while True:
encrypted_message = self.client_socket.recv(1024)
message = cipher.decrypt(encrypted_message).decode('utf-8')
if message == "/userlist":
with clients_lock:
userlist = "\n".join([f"\t{i + 1}) {user}" for i, user in enumerate(clients.keys())])
encrypted_response = cipher.encrypt(f"Connected Users:\n{userlist}".encode('utf-8'))
self.client_socket.send(encrypted_response)
continue
if message == "/help":
response = Fore.BLUE + "Help Menu:\n" \
"\t/help -> Help Menu\n" \
"\t/exit -> Exit the program.\n" \
"\t/clear -> Clear the chat screen.\n" \
"\t/userlist -> View the list of connected users.\n" \
"\t/dm [user] [message] -> Send a direct message to a user.\n" \
"\t/changeuser [new_username] -> Change your username.\n"
encrypted_response = cipher.encrypt(response.encode('utf-8'))
self.client_socket.send(encrypted_response)
continue
if message.startswith("/changeuser "):
_, new_username = message.split()
with clients_lock:
if new_username in clients:
encrypted_error = cipher.encrypt(
"This username is already taken. Please choose another one.".encode('utf-8'))
self.client_socket.send(encrypted_error)
else:
del clients[self.username]
self.username = new_username
clients[self.username] = self.client_socket
encrypted_success = cipher.encrypt(f"Username changed to {new_username}.".encode('utf-8'))
self.client_socket.send(encrypted_success)
continue
if message.startswith("/dm "):
_, recipient, *dm_msg_parts = message.split()
dm_message = " ".join(dm_msg_parts)
with clients_lock:
if recipient in clients:
clients[recipient].send(cipher.encrypt(f"[DM from {self.username}] {dm_message}".encode('utf-8')))
self.client_socket.send(cipher.encrypt(f"[DM to {recipient}] {dm_message}".encode('utf-8')))
else:
encrypted_error = cipher.encrypt("Specified user not found.".encode('utf-8'))
self.client_socket.send(encrypted_error)
continue
if message == "/clear":
encrypted_command = cipher.encrypt("/clear".encode("utf-8"))
self.client_socket.send(encrypted_command)
continue
if not message or message == "/exit":
logging.info(f"Exit {message}")
break
current_time = datetime.now().strftime('%Y-%m-%d %H:%M:%S')
broadcast_message = f"[{current_time}] {self.username}: {message}"
encrypted_broadcast = cipher.encrypt(broadcast_message.encode('utf-8'))
with clients_lock:
for usr, client in clients.items():
if usr != self.username:
client.send(encrypted_broadcast)
except:
pass
# Cleanup when the client exits
with clients_lock:
del clients[self.username]
logging.info(f"The user left: {username}")
self.client_socket.close()
def start_server(host, port):
try:
server_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
server_socket.bind((host, port))
host_ip, host_port = server_socket.getsockname()
server_socket.listen(5)
print("Server started. Waiting for clients...")
print(f"{Fore.YELLOW}Host information: {Style.RESET_ALL}{host_ip}:{host_port}")
print(f"{Fore.YELLOW}Default key : {Style.RESET_ALL}{str(password)}")
print(f"{Fore.YELLOW}Fernet Key : {Style.RESET_ALL}{str(fernet_key)}")
logging.info(f"Server started on {host_ip}:{host_port}")
while True:
current_time = datetime.now().strftime('%Y-%m-%d %H:%M:%S')
client_socket, client_address = server_socket.accept()
print(f"[{current_time}] {client_address} Connected.")
logging.info(f"Accepted connection from {client_address}")
handler = ClientHandler(client_socket)
handler.start()
except cryptography.fernet.InvalidToken:
print(f"{Fore.RED}Incorrect Key:{Style.RESET_ALL} [{current_time}] {client_address}")
logging.error(f"Invalid token for {client_address}")
pass
except OSError as e:
print(f"An error occurred while starting the server {e}")
logging.error(f"An error occurred: {e}")
except KeyboardInterrupt:
print("Program terminated.....")
logging.info("Server was terminated by keyboard interrupt")
if __name__ == "__main__":
parser = argparse.ArgumentParser(description="Start the chat server.")
parser.add_argument("--host", default="0.0.0.0", help="The IP address to bind the server to. (Default=0.0.0.0)")
parser.add_argument("--port", type=int, default=12345, help="The port number to bind the server to. (Default=12345)")
parser.add_argument("--key", default="mysecretpassword", help="The secret key for encryption. (Default=mysecretpassword)")
parser.add_argument("--loglevel", default="INFO", choices=["DEBUG", "INFO", "WARNING", "ERROR", "CRITICAL"],help="Set the logging level (Default: INFO)")
parser.add_argument("--logfile", default="server.log", help="Set the log file name. (Default: server.log)")
args = parser.parse_args()
password = args.key.encode()
key = hashlib.sha256(password).digest()
fernet_key = base64.urlsafe_b64encode(key)
cipher = Fernet(fernet_key)
log_setup(args.loglevel, args.logfile)
start_server(args.host, args.port)