fetch-node.py

#!/usr/bin/env python3

from io import BytesIO
import json
import os
from sys import argv
import tarfile
from urllib.request import urlopen


def get_bytes(url):
    return urlopen(url).read()


def get_str(url):
    return get_bytes(url).decode()


def get_index(chan):
    return json.loads(get_bytes("https://nodejs.org/download/{0}/index.json".format(chan)))


def get_linux_x64_ver(idx):
    for item in idx:
        if "linux-x64" in item["files"]:
            return item["version"]


def get_linux_x64_url(chan, ver):
    return "https://nodejs.org/download/{0}/{1}/node-{1}-linux-x64.tar.xz".format(chan, ver)


def get_linux_x64_bytes(chan, ver):
    return get_bytes(get_linux_x64_url(chan, ver))


def get_linux_x64_tar(chan, ver):
    return tarfile.open(mode="r:xz", fileobj=BytesIO(get_linux_x64_bytes(chan, ver)))


def extract_linux_x64_tar(chan, ver, path):
    get_linux_x64_tar(chan, ver).extractall(path=path)


if __name__ == "__main__":
    chan = argv[1]
    ver = get_linux_x64_ver(get_index(chan))
    extract_linux_x64_tar(chan, ver, os.getcwd())
    print("node-{0}-linux-x64".format(ver), end="")