Join Python receiver thingy

config.yml

port: 1818
commands:
# Join Push Text :  Command to run
  "eg=:=shutdown": "systemctl poweroff"

#fallback-cmd: "./fallbacktest.sh"

receiver.py

#!/usr/bin/python3.6
"""
Allows you to run commands on Join pushes
--

Changelog:

1.1.0:
    - Fallback commands
    - Pass join pushes to commands as "JOIN_PUSH" env. value
        (accessible as "$JOIN_PUSH" on (Ba)sh, "%JOIN_PUSH%" on cmd (i assume))

1.0.0:
    - Initial release

--

Copyright 2017+ Admicos

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated
documentation files (the "Software"), to deal in the Software without restriction, including without limitation the
rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit
persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the
Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
"""

from urllib import parse
import socket
import yaml
import re
import os


def extract_message(raw: str):
    """Extract message from Join's request"""
    return parse.unquote(re.search(r".* ?message=(.*) .*", raw.split("\r\n")[0]).group(1))


def main(cfg: dict):
    print("..--== By Admicos ==--..")
    print("This requires a running Chrome/ium instance with the Join extension.")
    print(f"Don't forget to set the 'EventGhost' port to {cfg['port']}")

    s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    s.bind(("127.0.0.1", cfg["port"]))

    s.listen(5)
    print("Started listening")
    while True:
        c, addr = s.accept()
        d = c.recv(512).decode("utf-8")

        msg = extract_message(d)

        print(f"{addr}: {msg}")
        cmd = cfg["commands"].get(msg)
        fallback_cmd = cfg.get("fallback-cmd")

        if cmd:
            print(f" - Running '{cmd}'")
            os.environ["JOIN_PUSH"] = msg
            os.system(cmd)
        elif fallback_cmd:
            print(f" - Running '{fallback_cmd}'")
            os.environ["JOIN_PUSH"] = msg
            os.system(fallback_cmd)
        else:
            print(f" - No command for '{msg}', ignoring")

        c.close()


if __name__ == '__main__':
    with open("config.yml") as f:
        config = yaml.load(f)

    main(config)