gameServer/Utils.hs
author nemo
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{-# LANGUAGE OverloadedStrings #-}
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module Utils where
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import Data.Char
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import Data.Word
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import qualified Data.Map as Map
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import qualified Data.Set as Set
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import Numeric
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import Network.Socket
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import System.IO
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import qualified Data.List as List
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import Control.Monad
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import qualified Codec.Binary.Base64 as Base64
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import qualified Data.ByteString.Lazy as BL
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import qualified Text.Show.ByteString as BS
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import qualified Data.ByteString.Char8 as B
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import qualified Data.ByteString as BW
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-------------------------------------------------
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import CoreTypes
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sockAddr2String :: SockAddr -> IO B.ByteString
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sockAddr2String (SockAddrInet _ hostAddr) = liftM B.pack $ inet_ntoa hostAddr
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sockAddr2String (SockAddrInet6 _ _ (a, b, c, d) _) =
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    return $ B.pack $ (foldr1 (.)
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        $ List.intersperse (':':)
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        $ concatMap (\n -> (\(a0, a1) -> [showHex a0, showHex a1]) $ divMod n 65536) [a, b, c, d]) []
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toEngineMsg :: B.ByteString -> B.ByteString
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toEngineMsg msg = B.pack $ Base64.encode (fromIntegral (BW.length msg) : BW.unpack msg)
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fromEngineMsg :: B.ByteString -> Maybe B.ByteString
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fromEngineMsg msg = liftM BW.pack (Base64.decode (B.unpack msg) >>= removeLength)
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    where
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        removeLength (x:xs) = if length xs == fromIntegral x then Just xs else Nothing
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        removeLength _ = Nothing
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checkNetCmd :: B.ByteString -> (Bool, Bool)
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checkNetCmd msg = check decoded
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    where
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        decoded = fromEngineMsg msg
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        check Nothing = (False, False)
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        check (Just ms) | B.length ms > 0 = let m = B.head ms in (m `Set.member` legalMessages, m == '+')
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                        | otherwise        = (False, False)
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        legalMessages = Set.fromList $ "M#+LlRrUuDdZzAaSjJ,sFNpPwtghbc12345" ++ slotMessages
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        slotMessages = "\128\129\130\131\132\133\134\135\136\137\138"
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maybeRead :: Read a => String -> Maybe a
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maybeRead s = case reads s of
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    [(x, rest)] | all isSpace rest -> Just x
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    _         -> Nothing
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teamToNet :: TeamInfo -> [B.ByteString]
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teamToNet team =
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        "ADD_TEAM"
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        : teamname team
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        : teamgrave team
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        : teamfort team
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        : teamvoicepack team
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        : teamflag team
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        : teamowner team
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        : (showB . difficulty $ team)
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        : hhsInfo
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    where
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        hhsInfo = concatMap (\(HedgehogInfo n hat) -> [n, hat]) $ hedgehogs team
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modifyTeam :: TeamInfo -> RoomInfo -> RoomInfo
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modifyTeam team room = room{teams = replaceTeam team $ teams room}
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    where
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    replaceTeam _ [] = error "modifyTeam: no such team"
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    replaceTeam tm (t:ts) =
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        if teamname tm == teamname t then
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            tm : ts
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        else
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            t : replaceTeam tm ts
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illegalName :: B.ByteString -> Bool
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illegalName s = B.null s || B.all isSpace s || isSpace (B.head s) || isSpace (B.last s)
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protoNumber2ver :: Word16 -> B.ByteString
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protoNumber2ver v = Map.findWithDefault "Unknown" v vermap
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    where
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        vermap = Map.fromList [
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            (17, "0.9.7-dev")
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            , (19, "0.9.7")
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            , (20, "0.9.8-dev")
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            , (21, "0.9.8")
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            , (22, "0.9.9-dev")
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            , (23, "0.9.9")
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            , (24, "0.9.10-dev")
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            , (25, "0.9.10")
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            , (26, "0.9.11-dev")
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            , (27, "0.9.11")
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            , (28, "0.9.12-dev")
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            , (29, "0.9.12")
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            , (30, "0.9.13-dev")
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            , (31, "0.9.13")
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            , (32, "0.9.14-dev")
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            , (33, "0.9.14")
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            , (34, "0.9.15-dev")
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            , (35, "0.9.14.1")
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            , (37, "0.9.15")
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            , (38, "0.9.16-dev")
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            ]
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askFromConsole :: B.ByteString -> IO B.ByteString
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askFromConsole msg = do
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    B.putStr msg
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    hFlush stdout
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    B.getLine
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unfoldrE :: (b -> Either b (a, b)) -> b -> ([a], b)
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unfoldrE f b  =
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    case f b of
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        Right (a, new_b) -> let (a', b') = unfoldrE f new_b in (a : a', b')
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        Left new_b       -> ([], new_b)
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showB :: (BS.Show a) => a -> B.ByteString
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showB = B.concat . BL.toChunks . BS.show
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readInt_ :: (Num a) => B.ByteString -> a
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readInt_ str =
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  case B.readInt str of
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       Just (i, t) | B.null t -> fromIntegral i
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       _                      -> 0 
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7d0f6e5b1c1c Hide last two octets of IP address from usual users
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7d0f6e5b1c1c Hide last two octets of IP address from usual users
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   128
cutHost :: B.ByteString -> B.ByteString
7d0f6e5b1c1c Hide last two octets of IP address from usual users
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   129
cutHost = B.intercalate "." .  flip (++) ["*","*"] . List.take 2 . B.split '.'