#!/usr/bin/env python3
# pylint: disable=C0103

"""
From a list of URLs, output the subdomains
accessed by the websites.
"""

import sys
import typing
import urllib.parse
import time

import progressbar
import selenium.webdriver.firefox.options
import seleniumwire.webdriver


def subdomain_from_url(url: str) -> str:
    """
    Extract the domain part from an url.
    """
    parsed = urllib.parse.urlparse(url)
    return parsed.netloc


def collect_subdomains(url: str) -> typing.Iterable[str]:
    """
    Load an URL into an headless browser and return all the domains
    it tried to access.
    """
    options = selenium.webdriver.firefox.options.Options()
    options.add_argument('-headless')
    driver = seleniumwire.webdriver.Firefox(
        executable_path='geckodriver', options=options)

    driver.get(url)
    time.sleep(10)
    for request in driver.requests:
        if request.response:
            yield subdomain_from_url(request.path)
    driver.close()


def collect_subdomains_standalone(url: str) -> None:
    url = url.strip()
    if not url:
        return
    try:
        for subdomain in collect_subdomains(url):
            print(subdomain)
    except:
        pass


if __name__ == '__main__':
    assert len(sys.argv) <= 2
    filename = None
    if len(sys.argv) == 2 and sys.argv[1] != '-':
        filename = sys.argv[1]
        num_lines = sum(1 for line in open(filename))
        iterator = progressbar.progressbar(open(filename), max_value=num_lines)
    else:
        iterator = sys.stdin

    for line in iterator:
        collect_subdomains_standalone(line)

    if filename:
        iterator.close()