Simple script that makes installing extensions from Chrome Store to Ungoogled Chromium a bit less of a headache

uchrstex.py

#!/usr/bin/python3
# Ungoogled Chromium webstore extensions install utility
# Made by _kana ( http://cyberhangar.org )

import sys, urllib.request, urllib.parse, subprocess, os, re

_cfg = {

    # Download directory (without / on the end). Make sure that you have read, write permissions.
    # Leave empty to download to script's working directory.
    'dl_dir': '',

    # Override the current Chromium version.
    'check_version': True,
    'custom_version': '',

    # Length of the extension id in the Chrome Store URL. Don't change it.
    'ext_id_length': 32
    
}

FNULL = open(os.devnull, 'w')
raw_dl_url = "https://clients2.google.com/service/update2/crx?response=redirect&acceptformat=crx2,crx3&prodversion={VERSION}&x=id%3D{EXTENSION_ID}%26installsource%3Dondemand%26uc"

if _cfg['check_version']:
    try:
        command_output = subprocess.check_output("chromium --version", shell=True).rstrip()
    except subprocess.CalledProcessError:
        print("Please install Ungoogled Chromium first.")
        sys.exit()

    browser_ver = command_output.decode().split()[1]
    browser_ver_short = browser_ver.split(".", 1)[0] + '.0'

else:
    browser_ver_short = browser_ver = _cfg['custom_version']

print("Detected Chromium version: " + browser_ver)

try:
    if sys.argv[1] in ['-h', '--help']:
        print("Example use:\n    python uchrstex.py https://chrome.google.com/webstore/detail/ublock-origin/cjpalhdlnbpafiamejdnhcphjbkeiagm?hl=pl")
        sys.exit()
except IndexError:
    pass

# Check if user has given any arguments
if not len(sys.argv) > 1:
    print("Not enough arguments.\nExample:\n    python uchrstex.py \"https://chrome.google.com/webstore/detail/ublock-origin/cjpalhdlnbpafiamejdnhcphjbkeiagm?hl=pl\"")
    sys.exit()

try:
    ext_store_url = sys.argv[1]
    ext_id = re.search(r"/([a-z]{" + str(_cfg['ext_id_length']) + "})", ext_store_url).group(0)[1:]
    print("Found extension id: " + ext_id)
except AttributeError:
    print("Chrome Store URL is not correct.")
    sys.exit()

ready_dl_url = raw_dl_url.format(EXTENSION_ID=ext_id, VERSION=browser_ver)
ext_filename = ext_id + '.crx'
ext_path     = (os.getcwd() if not _cfg['dl_dir'] else _cfg['dl_dir']) + '/' + ext_filename

print("Downloading {}...".format(ext_filename))
try:
    urllib.request.urlretrieve(ready_dl_url, ext_path)
except urllib.error.HTTPError as e:
    if e.status == 404:
        print("Extension with given URL doesn't exist.")
    else:
        print(e)
    sys.exit()

print("Installing extension (Chromium may not unminimize automatically)...")
subprocess.call(['chromium', ext_path], stdout=FNULL, stderr=subprocess.STDOUT)