artemis/titles/ongeki/index.py

from starlette.requests import Request
from starlette.routing import Route
from starlette.responses import Response
import json
import inflection
import yaml
import string
import logging
import coloredlogs
import zlib
from logging.handlers import TimedRotatingFileHandler
from Crypto.Cipher import AES
from Crypto.Util.Padding import pad
from Crypto.Protocol.KDF import PBKDF2
from Crypto.Hash import SHA1
from os import path
from typing import Tuple, Dict, List

from core.config import CoreConfig
from core.utils import Utils
from core.title import BaseServlet
from .config import OngekiConfig
from .const import OngekiConstants
from .base import OngekiBase
from .plus import OngekiPlus
from .summer import OngekiSummer
from .summerplus import OngekiSummerPlus
from .red import OngekiRed
from .redplus import OngekiRedPlus
from .bright import OngekiBright
from .brightmemory import OngekiBrightMemory


class OngekiServlet(BaseServlet):
    def __init__(self, core_cfg: CoreConfig, cfg_dir: str) -> None:
        super().__init__(core_cfg, cfg_dir)
        self.game_cfg = OngekiConfig()
        self.hash_table: Dict[Dict[str, str]] = {}
        if path.exists(f"{cfg_dir}/{OngekiConstants.CONFIG_NAME}"):
            self.game_cfg.update(
                yaml.safe_load(open(f"{cfg_dir}/{OngekiConstants.CONFIG_NAME}"))
            )

        self.versions = [
            OngekiBase(core_cfg, self.game_cfg),
            OngekiPlus(core_cfg, self.game_cfg),
            OngekiSummer(core_cfg, self.game_cfg),
            OngekiSummerPlus(core_cfg, self.game_cfg),
            OngekiRed(core_cfg, self.game_cfg),
            OngekiRedPlus(core_cfg, self.game_cfg),
            OngekiBright(core_cfg, self.game_cfg),
            OngekiBrightMemory(core_cfg, self.game_cfg),
        ]

        self.logger = logging.getLogger("ongeki")

        if not hasattr(self.logger, "inited"):
            log_fmt_str = "[%(asctime)s] Ongeki | %(levelname)s | %(message)s"
            log_fmt = logging.Formatter(log_fmt_str)
            fileHandler = TimedRotatingFileHandler(
                "{0}/{1}.log".format(self.core_cfg.server.log_dir, "ongeki"),
                encoding="utf8",
                when="d",
                backupCount=10,
            )

            fileHandler.setFormatter(log_fmt)

            consoleHandler = logging.StreamHandler()
            consoleHandler.setFormatter(log_fmt)

            self.logger.addHandler(fileHandler)
            self.logger.addHandler(consoleHandler)

            self.logger.setLevel(self.game_cfg.server.loglevel)
            coloredlogs.install(
                level=self.game_cfg.server.loglevel, logger=self.logger, fmt=log_fmt_str
            )
            self.logger.inited = True

        for version, keys in self.game_cfg.crypto.keys.items():
            if len(keys) < 3:
                continue

            self.hash_table[version] = {}

            method_list = [
                method
                for method in dir(self.versions[version])
                if not method.startswith("__")
            ]
            for method in method_list:
                method_fixed = inflection.camelize(method)[6:-7]
                # number of iterations is 64 on Bright Memory
                iter_count = 64
                hash = PBKDF2(
                    method_fixed,
                    bytes.fromhex(keys[2]),
                    128,
                    count=iter_count,
                    hmac_hash_module=SHA1,
                )

                hashed_name = hash.hex()[:32] # truncate unused bytes like the game does
                self.hash_table[version][hashed_name] = method_fixed

                self.logger.debug(
                    f"Hashed v{version} method {method_fixed} with {bytes.fromhex(keys[2])} to get {hash.hex()[:32]}"
                )

    @classmethod
    def is_game_enabled(cls, game_code: str, core_cfg: CoreConfig, cfg_dir: str) -> bool:
        game_cfg = OngekiConfig()

        if path.exists(f"{cfg_dir}/{OngekiConstants.CONFIG_NAME}"):
            game_cfg.update(
                yaml.safe_load(open(f"{cfg_dir}/{OngekiConstants.CONFIG_NAME}"))
            )

        if not game_cfg.server.enable:
            return False
        
        return True
    
    def get_routes(self) -> List[Route]:
        return [
            Route("/SDDT/{version:int}/{endpoint:str}", self.render_POST, methods=['POST'])
        ]
    
    def get_allnet_info(self, game_code: str, game_ver: int, keychip: str) -> Tuple[str, str]:
        title_port_int = Utils.get_title_port(self.core_cfg)
        title_port_ssl_int = Utils.get_title_port_ssl(self.core_cfg)
        proto = "https" if self.game_cfg.server.use_https and game_ver >= 120 else "http"

        if proto == "https":
            t_port = f":{title_port_ssl_int}" if title_port_ssl_int != 443 else ""
        
        else:    
            t_port = f":{title_port_int}" if title_port_int != 80 else ""

        return (
            f"{proto}://{self.core_cfg.server.hostname}{t_port}/{game_code}/{game_ver}/",
            f"{self.core_cfg.server.hostname}{t_port}/",
        )

    async def render_POST(self, request: Request) -> bytes:
        endpoint: str = request.path_params.get('endpoint', '')
        version: int = request.path_params.get('version', 0)
        if endpoint.lower() == "ping":
            return Response(zlib.compress(b'{"returnCode": 1}'))

        req_raw = await request.body()
        encrtped = False
        internal_ver = 0
        client_ip = Utils.get_ip_addr(request)

        if version < 105:  # 1.0
            internal_ver = OngekiConstants.VER_ONGEKI
        elif version >= 105 and version < 110:  # Plus
            internal_ver = OngekiConstants.VER_ONGEKI_PLUS
        elif version >= 110 and version < 115:  # Summer
            internal_ver = OngekiConstants.VER_ONGEKI_SUMMER
        elif version >= 115 and version < 120:  # Summer Plus
            internal_ver = OngekiConstants.VER_ONGEKI_SUMMER_PLUS
        elif version >= 120 and version < 125:  # Red
            internal_ver = OngekiConstants.VER_ONGEKI_RED
        elif version >= 125 and version < 130:  # Red Plus
            internal_ver = OngekiConstants.VER_ONGEKI_RED_PLUS
        elif version >= 130 and version < 135:  # Bright
            internal_ver = OngekiConstants.VER_ONGEKI_BRIGHT
        elif version >= 135 and version < 145:  # Bright Memory
            internal_ver = OngekiConstants.VER_ONGEKI_BRIGHT_MEMORY

        if all(c in string.hexdigits for c in endpoint) and len(endpoint) == 32:
            # If we get a 32 character long hex string, it's a hash and we're
            # doing encrypted. The likelyhood of false positives is low but
            # technically not 0
            if internal_ver not in self.hash_table:
                self.logger.error(
                    f"v{version} does not support encryption or no keys entered"
                )
                return Response(zlib.compress(b'{"stat": "0"}'))

            elif endpoint.lower() not in self.hash_table[internal_ver]:
                self.logger.error(
                    f"No hash found for v{version} endpoint {endpoint}"
                )
                return Response(zlib.compress(b'{"stat": "0"}'))

            endpoint = self.hash_table[internal_ver][endpoint.lower()]

            try:
                crypt = AES.new(
                    bytes.fromhex(self.game_cfg.crypto.keys[internal_ver][0]),
                    AES.MODE_CBC,
                    bytes.fromhex(self.game_cfg.crypto.keys[internal_ver][1]),
                )

                req_raw = crypt.decrypt(req_raw)

            except Exception as e:
                self.logger.error(
                    f"Failed to decrypt v{version} request to {endpoint} -> {e}"
                )
                return Response(zlib.compress(b'{"stat": "0"}'))

            encrtped = True

        if (
            not encrtped
            and self.game_cfg.crypto.encrypted_only
            and version >= 120
        ):
            self.logger.error(
                f"Unencrypted v{version} {endpoint} request, but config is set to encrypted only: {req_raw}"
            )
            return Response(zlib.compress(b'{"stat": "0"}'))

        if version < 105:
            # O.N.G.E.K.I base don't use zlib
            req_data = json.loads(req_raw)
        else:
            try:
                unzip = zlib.decompress(req_raw)
    
            except zlib.error as e:
                self.logger.error(
                    f"Failed to decompress v{version} {endpoint} request -> {e}"
                )
                return Response(zlib.compress(b'{"stat": "0"}'))

            req_data = json.loads(unzip)

        self.logger.info(
            f"v{version} {endpoint} request from {client_ip}"
        )
        self.logger.debug(req_data)

        func_to_find = "handle_" + inflection.underscore(endpoint) + "_request"

        if not hasattr(self.versions[internal_ver], func_to_find):
            self.logger.warning(f"Unhandled v{version} request {endpoint}")
            return Response(zlib.compress(b'{"returnCode": 1}'))

        try:
            handler = getattr(self.versions[internal_ver], func_to_find)
            resp = await handler(req_data)

        except Exception as e:
            self.logger.error(f"Error handling v{version} method {endpoint} - {e}")
            return Response(zlib.compress(b'{"stat": "0"}'))

        if resp == None:
            resp = {"returnCode": 1}

        self.logger.debug(f"Response {resp}")

        resp_raw = json.dumps(resp, ensure_ascii=False).encode("utf-8")
        zipped = zlib.compress(resp_raw)

        if not encrtped or version < 120:
            if version < 105:
                return Response(resp_raw)
            return Response(zipped)

        padded = pad(zipped, 16)

        crypt = AES.new(
            bytes.fromhex(self.game_cfg.crypto.keys[internal_ver][0]),
            AES.MODE_CBC,
            bytes.fromhex(self.game_cfg.crypto.keys[internal_ver][1]),
        )

        return Response(crypt.encrypt(padded))