tld.py

#!/usr/bin/env python3

import sys
import argparse


def parse_arguments():
    """ parse the arguments """

    p = argparse.ArgumentParser()

    p.add_argument(
        "--words-file",
        help="file with list of words [/usr/share/dict/words]",
        default="/usr/share/dict/words",
    )

    p.add_argument(
        "--tlds-file", help="file with list of tlds [tlds.txt]", default="tlds.txt"
    )

    p.add_argument(
        "--tlds", help="manually specify tlds as comma-separated list", default=False
    )

    p.add_argument(
        "--leet",
        help="generate domains that replace letters with numbers",
        action="store_true",
    )

    p.add_argument("--min-size", default=0, type=int, help="minimum word length")
    p.add_argument("--max-size", default=100000, type=int, help="maximum word length")

    return p.parse_args()


def iter_words(handle):
    """ iterate over list of words in text file """

    return (word.strip().lower() for word in handle)


def get_tlds(tlds_file):
    """ iterate over list of tlds in text file """

    with open(tlds_file) as handle:

        return [line.split()[0].strip().lower() for line in handle]


def iter_domains(words, tlds):
    """ list domains made from words and tlds """

    return (
        "{}.{}".format(word.rstrip(tld), tld)
        for word in words
        for tld in tlds
        if word.endswith(tld)
    )


def l33tify(domain):
    """ Produce 1337 versions of words """

    replacements = {
        "a": "4",
        "b": "8",
        "e": "3",
        "g": "6",
        "i": "1",
        "o": "0",
        "s": "5",
        "t": "7",
        "z": "2",
    }

    word, tld = domain.split(".")

    return "".join([replacements.get(char, char) for char in word]) + "." + tld


if __name__ == "__main__":
    args = parse_arguments()

    if not args.tlds:
        tlds = get_tlds(args.tlds_file)
    else:
        tlds = args.tlds.split(",")

    with open(args.words_file) as handle:
        processed_domains = (
            l33tify(domain) if args.leet else domain
            for domain in iter_domains(iter_words(handle), tlds)
            if len(domain) in range(args.min_size, args.max_size)
        )

        for domain in processed_domains:
            print(domain)