artemis/titles/sao/index.py

import logging
import secrets
from hashlib import md5
from logging.handlers import TimedRotatingFileHandler
from os import path
from typing import List, Tuple

import coloredlogs
import yaml
from core import CoreConfig, Utils
from core.title import BaseServlet
from Crypto.Cipher import Blowfish
from starlette.requests import Request
from starlette.responses import Response
from starlette.routing import Route
from titles.sao.base import SaoBase
from titles.sao.config import SaoConfig
from titles.sao.const import SaoConstants
from titles.sao.handlers.base import *


class SaoServlet(BaseServlet):
    def __init__(self, core_cfg: CoreConfig, cfg_dir: str) -> None:
        super().__init__(core_cfg, cfg_dir)
        self.config_dir = cfg_dir
        self.game_cfg = SaoConfig()
        if path.exists(f"{cfg_dir}/sao.yaml"):
            self.game_cfg.update(yaml.safe_load(open(f"{cfg_dir}/sao.yaml")))

        self.logger = logging.getLogger("sao")
        if not hasattr(self.logger, "inited"):
            log_fmt_str = "[%(asctime)s] SAO | %(levelname)s | %(message)s"
            log_fmt = logging.Formatter(log_fmt_str)
            fileHandler = TimedRotatingFileHandler(
                "{0}/{1}.log".format(self.core_cfg.server.log_dir, "sao"),
                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

        self.base = SaoBase(core_cfg, self.game_cfg)
        self.static_hash = None

        if self.game_cfg.hash.verify_hash:
            self.static_hash = md5(
                self.game_cfg.hash.hash_base.encode()
            ).digest()  # Greate hashing guys, really validates the data

    def get_routes(self) -> List[Route]:
        return [
            Route(
                "/{datecode:int}/proto/if/{category:str}/{endpoint:str}",
                self.render_POST,
                methods=["POST"],
            )
        ]

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

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

        if not game_cfg.server.enable:
            return False

        return True

    def get_allnet_info(
        self, game_code: str, game_ver: int, keychip: str
    ) -> Tuple[str, str]:
        port_ssl = Utils.get_title_port_ssl(self.core_cfg)
        port_normal = Utils.get_title_port(self.core_cfg)

        proto = "http"
        port = f":{port_normal}" if port_normal != 80 else ""

        if self.game_cfg.server.use_https:
            proto = "https"
            port = f":{port_ssl}" if port_ssl != 443 else ""

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

    def get_mucha_info(self, core_cfg: CoreConfig, cfg_dir: str) -> Tuple[bool, str]:
        if not self.game_cfg.server.enable:
            return (False, [], [])

        return (True, SaoConstants.GAME_CDS, SaoConstants.NETID_PREFIX)

    async def render_POST(self, request: Request) -> bytes:
        endpoint = request.path_params.get("endpoint", "")
        iv = b""

        req_raw = await request.body()
        if len(req_raw) < 40:
            self.logger.warn(f"Malformed request to {endpoint} - {req_raw.hex()}")
            return Response()
        req_header = SaoRequestHeader(req_raw)

        cmd_str = f"{req_header.cmd:04x}"

        if self.game_cfg.hash.verify_hash and self.static_hash != req_header.hash:
            self.logger.error(
                f"Hash mismatch! Expecting {self.static_hash} but recieved {req_header.hash}"
            )
            return Response()

        if self.game_cfg.crypt.enable:
            iv = req_raw[40:48]
            cipher = Blowfish.new(
                self.game_cfg.crypt.key.encode(), Blowfish.MODE_CBC, iv
            )
            crypt_data = req_raw[48:]
            req_data = cipher.decrypt(crypt_data)
            self.logger.debug(f"Decrypted {req_data.hex()} with IV {iv.hex()}")

        else:
            req_data = req_raw[40:]

        handler = getattr(self.base, f"handle_{cmd_str}", self.base.handle_noop)
        self.logger.info(f"{endpoint} - {cmd_str} request")
        self.logger.debug(f"Request: {req_raw.hex()}")
        resp = await handler(req_header, req_data)

        if resp is None:
            resp = SaoNoopResponse(req_header.cmd + 1).make()

        if type(resp) == bytes:
            pass

        elif issubclass(resp, SaoBaseResponse):
            resp = resp.make()

        else:
            self.logger.error(f"Unknown response type {type(resp)}")
            return Response()

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

        if self.game_cfg.crypt.enable:
            iv = secrets.token_bytes(8)
            data_to_crypt = resp[24:]
            while len(data_to_crypt) % 8 != 0:
                data_to_crypt += b"\x00"

            cipher = Blowfish.new(
                self.game_cfg.crypt.key.encode(), Blowfish.MODE_CBC, iv
            )
            data_crypt = cipher.encrypt(data_to_crypt)
            crypt_data_len = len(data_crypt) + len(iv)
            tmp = struct.pack(
                "!I", crypt_data_len
            )  # does it want the length of the encrypted response??
            resp = resp[:20] + tmp + iv + data_crypt
            self.logger.debug(f"Encrypted Response: {resp.hex()}")

        return Response(resp, media_type="text/html; charset=utf-8")