A script that converts a list of network addresses into a PAC script for browsers.

ip4_to_PAC.py

import requests
from jinja2 import Template
import time
from ipaddress import ip_network
from pathlib import Path


def main():
    # Адрес списка запрещёнки
    url = "https://antifilter.download/list/allyouneed.lst"
    rule_list_filename = Path("source.lst")
    need_update = False
    if not rule_list_filename.exists():
        need_update = True
        print("Rule list does not exist. Downloading...")
    else:
        file_time = rule_list_filename.stat().st_mtime
        now_time = time.time()
        if (now_time - file_time) > 6 * 60 * 60:
            need_update = True
            print("Rule list is older than 6 hours. Downloading...")
    if need_update:

        r = requests.get(url, allow_redirects=True)
        rule_list_filename.open("wb").write(r.content)
        rules_list = r.content.decode("utf-8").split("\n")
    else:
        rules_list = rule_list_filename.open().readlines()

    # Sanitize the list
    rules_list = [ip_network(s.strip()) for s in rules_list if len(s) >= 4]
    rules_list = [(n.network_address, n.netmask) for n in rules_list]

    print("Rule list is ready")
    print(f"Total rules: {len(rules_list)}")

    tm = Template(pac_template)
    result = tm.render(blacks=rules_list)

    output_file = Path("result.txt")

    with output_file.open("w") as f:
        f.write(result)


pac_template = """
function FindProxyForURL(url, host) {

    /* Проксю настраивать здесь */
    var proxy = "PROXY 192.168.1.77:8118";

    /* Normalize the URL for pattern matching */
    url = url.toLowerCase();
    host = host.toLowerCase();

    /* Добавим вручную сайты, которые не в списке, но открывать надо через прокси */
    /* На примере жизненно необходимого */
    if (dnsDomainIs(host, ".pornhub.com") ||
        (host == "pornhub.com") ) {
        return proxy;
    }

    /* Don't proxy local hostnames */
    if (isPlainHostName(host)) {
        return 'DIRECT';
    }    

    /* Don't proxy Windows Update */
    if ((host == "download.microsoft.com") ||
        (host == "ntservicepack.microsoft.com") ||
        (host == "cdm.microsoft.com") ||
        (host == "wustat.windows.com") ||
        (host == "windowsupdate.microsoft.com") ||
        (dnsDomainIs(host, ".windowsupdate.microsoft.com")) ||
        (host == "update.microsoft.com") ||
        (dnsDomainIs(host, ".update.microsoft.com")) ||
        (dnsDomainIs(host, ".windowsupdate.com"))) {
        return 'DIRECT';
    }

    if (isResolvable(host)) {
        var hostIP = dnsResolve(host);

        /* Don't proxy non-routable addresses (RFC 3330) */
        if (isInNet(hostIP, '0.0.0.0', '255.0.0.0') ||
            isInNet(hostIP, '10.0.0.0', '255.0.0.0') ||
            isInNet(hostIP, '127.0.0.0', '255.0.0.0') ||
            isInNet(hostIP, '169.254.0.0', '255.255.0.0') ||
            isInNet(hostIP, '172.16.0.0', '255.240.0.0') ||
            isInNet(hostIP, '192.0.2.0', '255.255.255.0') ||
            isInNet(hostIP, '192.88.99.0', '255.255.255.0') ||
            isInNet(hostIP, '192.168.0.0', '255.255.0.0') ||
            isInNet(hostIP, '198.18.0.0', '255.254.0.0') ||
            isInNet(hostIP, '224.0.0.0', '240.0.0.0') ||
            isInNet(hostIP, '240.0.0.0', '240.0.0.0')) {
            return 'DIRECT';
        }

        /* Шаблон Жижы! Не дышать! */
        if (false {% for black in blacks %}||
            isInNet(hostIP, '{{black[0]}}', '{{black[1]}}') {% endfor %}){
                return proxy;
            }
    }
    return 'DIRECT';
}
"""


if __name__ == "__main__":
    main()