artemis/core/aimedb.py

import logging, coloredlogs
from Crypto.Cipher import AES
from typing import Dict, Tuple, Callable, Union, Optional
import asyncio
from logging.handlers import TimedRotatingFileHandler

from core.config import CoreConfig
from core.utils import create_sega_auth_key
from core.data import Data
from .adb_handlers import *

class AimedbServlette():
    request_list: Dict[int, Tuple[Callable[[bytes, int], Union[ADBBaseResponse, bytes]], int, str]] = {}
    def __init__(self, core_cfg: CoreConfig) -> None:        
        self.config = core_cfg        
        self.data = Data(core_cfg)

        self.logger = logging.getLogger("aimedb")
        if not hasattr(self.logger, "initted"):
            log_fmt_str = "[%(asctime)s] Aimedb | %(levelname)s | %(message)s"
            log_fmt = logging.Formatter(log_fmt_str)

            fileHandler = TimedRotatingFileHandler(
                "{0}/{1}.log".format(self.config.server.log_dir, "aimedb"),
                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.config.aimedb.loglevel)
            coloredlogs.install(
                level=core_cfg.aimedb.loglevel, logger=self.logger, fmt=log_fmt_str
            )
            self.logger.initted = True

        if not core_cfg.aimedb.key:
            self.logger.error("!!!KEY NOT SET!!!")
            exit(1)

        self.register_handler(0x01, 0x03, self.handle_felica_lookup, 'felica_lookup')
        self.register_handler(0x02, 0x03, self.handle_felica_register, 'felica_register')

        self.register_handler(0x04, 0x06, self.handle_lookup, 'lookup')
        self.register_handler(0x05, 0x06, self.handle_register, 'register')

        self.register_handler(0x07, 0x08, self.handle_status_log, 'status_log')
        self.register_handler(0x09, 0x0A, self.handle_log, 'aime_log')       

        self.register_handler(0x0B, 0x0C, self.handle_campaign, 'campaign')
        self.register_handler(0x0D, 0x0E, self.handle_campaign_clear, 'campaign_clear')

        self.register_handler(0x0F, 0x10, self.handle_lookup_ex, 'lookup_ex')
        self.register_handler(0x11, 0x12, self.handle_felica_lookup_ex, 'felica_lookup_ex')

        self.register_handler(0x13, 0x14, self.handle_log_ex, 'aime_log_ex')
        self.register_handler(0x64, 0x65, self.handle_hello, 'hello')

    def register_handler(self, cmd: int, resp:int, handler: Callable[[bytes, int], Union[ADBBaseResponse, bytes]], name: str) -> None:
        self.request_list[cmd] = (handler, resp, name)
    
    def start(self) -> None:
        self.logger.info(f"Start on port {self.config.aimedb.port}")
        addr = self.config.aimedb.listen_address if self.config.aimedb.listen_address else self.config.server.listen_address
        asyncio.create_task(asyncio.start_server(self.dataReceived, addr, self.config.aimedb.port))
    
    async def dataReceived(self, reader: asyncio.StreamReader, writer: asyncio.StreamWriter):
        self.logger.debug(f"Connection made from {writer.get_extra_info('peername')[0]}")
        while True:
            try:
                data: bytes = await reader.read(4096)
                if len(data) == 0:
                    self.logger.debug("Connection closed")
                    return
                await self.process_data(data, reader, writer)
                await writer.drain()
            except ConnectionResetError as e:
                self.logger.debug("Connection reset, disconnecting")
                return

    async def process_data(self, data: bytes, reader: asyncio.StreamReader, writer: asyncio.StreamWriter) -> Optional[bytes]:
        addr = writer.get_extra_info('peername')[0]
        cipher = AES.new(self.config.aimedb.key.encode(), AES.MODE_ECB)

        try:
            decrypted = cipher.decrypt(data)
        
        except Exception as e:
            self.logger.error(f"Failed to decrypt {data.hex()} because {e}")
            return

        self.logger.debug(f"{addr} wrote {decrypted.hex()}")

        try:
            head = ADBHeader.from_data(decrypted)
        
        except ADBHeaderException as e:
            self.logger.error(f"Error parsing ADB header: {e}")
            try:    
                encrypted = cipher.encrypt(ADBBaseResponse().make())
                writer.write(encrypted)
                await writer.drain()
                return

            except Exception as e:
                self.logger.error(f"Failed to encrypt default response because {e}")
            
            return

        if head.keychip_id == "ABCD1234567" or head.store_id == 0xfff0:
            self.logger.warning(f"Request from uninitialized AMLib: {vars(head)}")

        if head.cmd == 0x66:
            self.logger.info("Goodbye")
            writer.close()
            return

        handler, resp_code, name = self.request_list.get(head.cmd, (self.handle_default, None, 'default'))

        if resp_code is None:
            self.logger.warning(f"No handler for cmd {hex(head.cmd)}")
        
        elif resp_code > 0:
            self.logger.info(f"{name} from {head.keychip_id} ({head.game_id}) @ {addr}")
        
        resp = await handler(decrypted, resp_code)

        if type(resp) == ADBBaseResponse or issubclass(type(resp), ADBBaseResponse):
            resp_bytes = resp.make()

        elif type(resp) == bytes:
            resp_bytes = resp
        
        elif resp is None: # Nothing to send, probably a goodbye
            self.logger.warn(f"None return by handler for {name}")
            return
        
        else:
            self.logger.error(f"Unsupported type returned by ADB handler for {name}: {type(resp)}")
            raise TypeError(f"Unsupported type returned by ADB handler for {name}: {type(resp)}")

        try:
            encrypted = cipher.encrypt(resp_bytes)
            self.logger.debug(f"Response {resp_bytes.hex()}")
            writer.write(encrypted)

        except Exception as e:
            self.logger.error(f"Failed to encrypt {resp_bytes.hex()} because {e}")
    
    async def handle_default(self, data: bytes, resp_code: int, length: int = 0x20) -> ADBBaseResponse:
        req = ADBHeader.from_data(data)
        return ADBBaseResponse(resp_code, length, 1, req.game_id, req.store_id, req.keychip_id, req.protocol_ver)

    async def handle_hello(self, data: bytes, resp_code: int) -> ADBBaseResponse:
        return await self.handle_default(data, resp_code)

    async def handle_campaign(self, data: bytes, resp_code: int) -> ADBBaseResponse:
        h = ADBHeader.from_data(data)
        if h.protocol_ver >= 0x3030:
            req = h
            resp = ADBCampaignResponse.from_req(req)

        else:
            req = ADBOldCampaignRequest(data)
            
            self.logger.info(f"Legacy campaign request for campaign {req.campaign_id} (protocol version {hex(h.protocol_ver)})")
            resp = ADBOldCampaignResponse.from_req(req.head)
        
        # We don't currently support campaigns
        return resp

    async def handle_lookup(self, data: bytes, resp_code: int) -> ADBBaseResponse:
        req = ADBLookupRequest(data)
        user_id = await self.data.card.get_user_id_from_card(req.access_code)
        is_banned = await self.data.card.get_card_banned(req.access_code)
        is_locked = await self.data.card.get_card_locked(req.access_code)
        
        ret = ADBLookupResponse.from_req(req.head, user_id)
        if is_banned and is_locked:
            ret.head.status = ADBStatus.BAN_SYS_USER
        elif is_banned:
            ret.head.status = ADBStatus.BAN_SYS
        elif is_locked:
            ret.head.status = ADBStatus.LOCK_USER
        
        self.logger.info(
            f"access_code {req.access_code} -> user_id {ret.user_id}"
        )
        return ret

    async def handle_lookup_ex(self, data: bytes, resp_code: int) -> ADBBaseResponse:
        req = ADBLookupRequest(data)
        user_id = await self.data.card.get_user_id_from_card(req.access_code)

        is_banned = await self.data.card.get_card_banned(req.access_code)
        is_locked = await self.data.card.get_card_locked(req.access_code)

        ret = ADBLookupExResponse.from_req(req.head, user_id)
        if is_banned and is_locked:
            ret.head.status = ADBStatus.BAN_SYS_USER
        elif is_banned:
            ret.head.status = ADBStatus.BAN_SYS
        elif is_locked:
            ret.head.status = ADBStatus.LOCK_USER

        self.logger.info(
            f"access_code {req.access_code} -> user_id {ret.user_id}"
        )

        if user_id and user_id > 0 and self.config.aimedb.id_secret:
            auth_key = create_sega_auth_key(user_id, req.head.game_id, req.head.store_id, req.head.keychip_id, self.config.aimedb.id_secret, self.config.aimedb.id_lifetime_seconds)
            if auth_key is not None:
                auth_key_extra_len = 256 - len(auth_key)
                auth_key_full = auth_key.encode() + (b"\0" * auth_key_extra_len)
                self.logger.debug(f"Generated auth token {auth_key}")
                ret.auth_key = auth_key_full

        return ret

    async def handle_felica_lookup(self, data: bytes, resp_code: int) -> bytes:
        """
        On official, I think a card has to be registered for this to actually work, but 
        I'm making the executive decision to not implement that and just kick back our
        faux generated access code. The real felica IDm -> access code conversion is done
        on the ADB server, which we do not and will not ever have access to. Because we can
        assure that all IDms will be unique, this basic 0-padded hex -> int conversion will
        be fine.
        """
        req = ADBFelicaLookupRequest(data)
        ac = self.data.card.to_access_code(req.idm)
        self.logger.info(
            f"idm {req.idm} ipm {req.pmm} -> access_code {ac}"
        )
        return ADBFelicaLookupResponse.from_req(req.head, ac)

    async def handle_felica_register(self, data: bytes, resp_code: int) -> bytes:
        """
        I've never seen this used.
        """
        req = ADBFelicaLookupRequest(data)
        ac = self.data.card.to_access_code(req.idm)
        
        if self.config.server.allow_user_registration:
            user_id = await self.data.user.create_user()

            if user_id is None:
                self.logger.error("Failed to register user!")
                user_id = -1

            else:
                card_id = await self.data.card.create_card(user_id, ac)

                if card_id is None:
                    self.logger.error("Failed to register card!")
                    user_id = -1

            self.logger.info(
                f"Register access code {ac} (IDm: {req.idm} PMm: {req.pmm}) -> user_id {user_id}"
            )

        else:
            self.logger.info(
                f"Registration blocked!: access code {ac} (IDm: {req.idm} PMm: {req.pmm})"
            )

        return ADBFelicaLookupResponse.from_req(req.head, ac)

    async def handle_felica_lookup_ex(self, data: bytes, resp_code: int) -> bytes:
        req = ADBFelicaLookup2Request(data)
        access_code = self.data.card.to_access_code(req.idm)
        user_id = await self.data.card.get_user_id_from_card(access_code=access_code)

        if user_id is None:
            user_id = -1

        self.logger.info(
            f"idm {req.idm} ipm {req.pmm} -> access_code {access_code} user_id {user_id}"
        )

        resp = ADBFelicaLookup2Response.from_req(req.head, user_id, access_code)

        if user_id and user_id > 0 and self.config.aimedb.id_secret:
            auth_key = create_sega_auth_key(user_id, req.head.game_id, req.head.store_id, req.head.keychip_id, self.config.aimedb.id_secret, self.config.aimedb.id_lifetime_seconds)
            if auth_key is not None:
                auth_key_extra_len = 256 - len(auth_key)
                auth_key_full = auth_key.encode() + (b"\0" * auth_key_extra_len)
                self.logger.debug(f"Generated auth token {auth_key}")
                resp.auth_key = auth_key_full

        return resp

    async def handle_campaign_clear(self, data: bytes, resp_code: int) -> ADBBaseResponse:
        req = ADBCampaignClearRequest(data)

        resp = ADBCampaignClearResponse.from_req(req.head)

        # We don't support campaign stuff
        return resp

    async def handle_register(self, data: bytes, resp_code: int) -> bytes:
        req = ADBLookupRequest(data)
        user_id = -1

        if self.config.server.allow_user_registration:
            user_id = await self.data.user.create_user()

            if user_id is None:
                self.logger.error("Failed to register user!")
                user_id = -1

            else:
                card_id = await self.data.card.create_card(user_id, req.access_code)

                if card_id is None:
                    self.logger.error("Failed to register card!")
                    user_id = -1

            self.logger.info(
                f"Register access code {req.access_code} -> user_id {user_id}"
            )

        else:
            self.logger.info(
                f"Registration blocked!: access code {req.access_code}"
            )

        resp = ADBLookupResponse.from_req(req.head, user_id)
        if resp.user_id <= 0:
            resp.head.status = ADBStatus.BAN_SYS # Closest we can get to a "You cannot register"

        return resp

    # TODO: Save these in some capacity, as deemed relevant
    async def handle_status_log(self, data: bytes, resp_code: int) -> bytes:
        req = ADBStatusLogRequest(data)
        self.logger.info(f"User {req.aime_id} logged {req.status.name} event")
        return ADBBaseResponse(resp_code, 0x20, 1, req.head.game_id, req.head.store_id, req.head.keychip_id, req.head.protocol_ver)

    async def handle_log(self, data: bytes, resp_code: int) -> bytes:
        req = ADBLogRequest(data)
        self.logger.info(f"User {req.aime_id} logged {req.status.name} event, credit_ct: {req.credit_ct} bet_ct: {req.bet_ct} won_ct: {req.won_ct}")
        return ADBBaseResponse(resp_code, 0x20, 1, req.head.game_id, req.head.store_id, req.head.keychip_id, req.head.protocol_ver)

    async def handle_log_ex(self, data: bytes, resp_code: int) -> bytes:
        req = ADBLogExRequest(data)
        strs = []
        self.logger.info(f"Recieved {req.num_logs} or {len(req.logs)} logs")
        
        for x in range(req.num_logs):
            self.logger.debug(f"User {req.logs[x].aime_id} logged {req.logs[x].status.name} event, credit_ct: {req.logs[x].credit_ct} bet_ct: {req.logs[x].bet_ct} won_ct: {req.logs[x].won_ct}")
        return ADBLogExResponse.from_req(req.head)