Simple HTTP File Server - Convenient script to transfer file within LAN

simple-http-file-server.py

import http.server
import socket
import sys

def check_port_in_use(port):
    # Check if the specified port is in use
    with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
        return s.connect_ex(('localhost', port)) == 0

def find_available_port(start_port):
    # Find an available port starting from the specified port
    port = start_port
    while check_port_in_use(port):
        port += 1
    return port

def start_file_server(port):
    # Start the HTTP file server on the specified port
    handler = http.server.SimpleHTTPRequestHandler
    with http.server.HTTPServer(('localhost', port), handler) as server:
        print(f"Server started on http://localhost:{port}/")
        server.serve_forever()

if __name__ == "__main__":
    default_port = 8000

    # Check if a port is provided as a command-line argument
    if len(sys.argv) > 1:
        try:
            custom_port = int(sys.argv[1])
            if 0 < custom_port < 65535:
                port = custom_port
            else:
                print("Invalid port number. Using the default port:", default_port)
        except ValueError:
            print("Invalid port. Using the default port:", default_port)
    else:
        port = default_port

    # Check if the chosen port is in use and find an available one if necessary
    if check_port_in_use(port):
        print(f"Port {port} is in use. Finding an available port...")
        port = find_available_port(port)
        print(f"Found available port: {port}")

    # Start the file server on the chosen/available port
    start_file_server(port)