#!/usr/bin/env python3

import sys
import requests
import hmac
import hashlib
import pathlib
import os


def get_args():
    """ Get command line arguments """

    import argparse
    parser = argparse.ArgumentParser()
    parser.add_argument('susserver')
    parser.add_argument('command')
    parser.add_argument('shortlink')
    parser.add_argument('value')
    parser.add_argument('--secret-file', type=pathlib.Path, default=pathlib.Path(os.path.expanduser('~/.susmng_secret')))
    parser.add_argument('--http', action='store_true')
    return parser.parse_args()


def main(args):
    """ Entry point for script """

    if not args.secret_file.exists():
        print(f"secret file does not exist at: {args.secret_file}")
        return

    with open(args.secret_file) as fp:
        secret = fp.read().strip()

    r = requests.post(f"{'http' if args.http else 'https'}://{args.susserver}",
            data = {
                'Command': args.command,
                'Shortlink': args.shortlink,
                'Value': args.value,
                },
            headers = {
                'Signature': 'SUS-SIGNATURE-' + hmac.new(
                    secret.encode("UTF-8"),
                    (args.command+":"+args.shortlink+":"+args.value).encode("UTF-8"),
                    hashlib.sha256
                    ).hexdigest()
                }
            )
    print(r)
    print(r.content)
    return 0


if __name__ == '__main__':
    try:
        sys.exit(main(get_args()))
    except KeyboardInterrupt:
        sys.exit(0)