#!/usr/bin/env python3

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

import sys
import typing
import urllib.parse

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)
    for request in driver.requests:
        if request.response:
            yield subdomain_from_url(request.path)
    driver.close()


if __name__ == '__main__':
    for line in sys.stdin:
        line = line.strip()
        if not line:
            continue
        for subdomain in collect_subdomains(line):
            print(subdomain)