launcher.py

import json
import subprocess
import asyncio
import aiohttp
import os
from os.path import expanduser
home = expanduser("~")


def url2filename(url):
    return url.split('/')[-1]


async def download(session, url):
    async with session.get(url) as response:
        assert response.status == 200
        chunk = await response.read()
        with open(directory + url2filename(url), "wb") as f:
                f.write(chunk)
                print('[Download] Finished', url2filename(url))

class Launcher:
    def __init__(self, base: str, version: int):
        self.base = base
        self.version = base + "versions/" + str(version) + "/" + str(version)

        with open(self.version + ".json", 'r') as content_file:
            content = content_file.read()
        self.config = json.loads(content)
        self.libraries = []
        self.urls = []


    def get_urls(self, os: str="linux"):
        for library in self.config["libraries"]:
            if "rules" in library:
                rules = library["rules"]
                download = "deny"
                for rule in rules:
                    if "os" in rule:
                        if rule["os"]["name"] == os:
                            download = rule["action"]
                    else:
                        download = rule["action"]
                if download != "allow":
                    continue
        
            file = library["downloads"]
            if "artifact" in file:
                download = file["artifact"]
            elif "natives" in library:
                natives = library["natives"]
                if os not in natives:
                    continue
                native = natives[os]
                download = file["classifiers"][native]
            else:
                continue
            url = download["url"].replace("https://libraries.minecraft.net/", "")
        
            self.libraries.append(self.base + "libraries/" + url)
            self.urls.append("https://libraries.minecraft.net/" + url)
        
        self.libraries.append(self.version + ".jar")
        return self.libraries, self.urls


    def build(self, uuid: str, username: str, access_token: str):
        cp = ":".join(self.libraries)

        command = ["java", "-Djava.library.path=/home/jscob/.minecraft/versions/1.12/1.12-natives-10067959929778",
                   "-cp", cp, "net.minecraft.client.main.Main", "--version", str(self.version), "--gameDir", self.base,
                   "--assetsDir", (self.base + "assets"), "--uuid", uuid, "--username", username, "--accessToken",
                   access_token]
        return command


    def start(self, command):
        p = subprocess.Popen(command, stdout=subprocess.PIPE)
        output, err = p.communicate()
        return output


directory = 'libraries/'
if not os.path.exists(directory):
    os.makedirs(directory)
launcher = Launcher(base='C:\\Users\\spork\\AppData\\Roaming\\.minecraft\\',version='1.12')
libraries, urls = launcher.get_urls(os='windows')
loop = asyncio.get_event_loop()
for url in urls:
    print('[Download] Downloading ' + url2filename(url))
    with aiohttp.ClientSession(loop=loop) as session:
        response = loop.run_until_complete(download(session, url=url))