yusong-routeros-downloader.py

#!/usr/bin/env python3
import re
import time

import requests

RE_NONCE = re.compile(r"time=(\d+\.\d+)")
RE_INDEX = re.compile(r"\('(\d+)'\)\"\s*>(.+)</a>")
DOWNLOAD_PAGE = "http://www.irouteros.com/download.php"


def get_name_list():
    response = requests.get(DOWNLOAD_PAGE)
    return RE_INDEX.findall(response.text)


def get_nonce(session: requests.Session):
    response = session.get(DOWNLOAD_PAGE)
    matched = RE_NONCE.search(response.text)
    if not matched:
        return
    return matched.groups()[0]


def task(index: int, saved_filename: str):
    session = requests.session()
    nonce = get_nonce(session)
    time.sleep(10)
    response = session.get(DOWNLOAD_PAGE, params={
        "act": "down",
        "id": index,
        "time": nonce,
    })
    with open(saved_filename, "wb") as fp:
        fp.write(response.content)


def main():
    for index, filename in get_name_list():
        print("Started %r" % filename)
        task(index, filename)
        print("End")


if __name__ == "__main__":
    main()