#!/usr/bin/env python3

"""
pip install pyftpdlib
"""

import argparse
import os
from os import path
from pyftpdlib.handlers import FTPHandler
from pyftpdlib.servers import FTPServer
from pyftpdlib.authorizers import DummyAuthorizer


handler = FTPHandler


def init_auth(dir):
    authorizer = DummyAuthorizer()
    authorizer.add_user('admin', '123456', dir, perm='elradfmwM')
    handler.authorizer = authorizer


if __name__ == "__main__":
    parser = argparse.ArgumentParser(description='ftp module of argparse')

    # 指定-p/--port的参数
    # 类型为int
    # help为简短地说明
    parser.add_argument(
        '-p', '--port', default=2121, type=int,
        help='ftp server port'
    )

    # 指定-H/--host
    parser.add_argument(
        '-H', '--host', default="localhost", type=str,
        help='ftp server bind host'
    )

    # 指定-d/--dir参数
    parser.add_argument(
        '-d', '--dir', default=".", type=str,
        help='ftp server user home'
    )
    args = parser.parse_args()
    dir = path.abspath(args.dir)
    print("current dir: {}", dir)
    init_auth(dir)
    server = FTPServer((args.host, args.port), handler)
    print("ftp server start at: {}:{}".format(args.host, args.port))
    server.serve_forever()