{-
* Hedgewars, a free turn based strategy game
* Copyright (c) 2004-2014 Andrey Korotaev <unC0Rr@gmail.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
\-}
{-# LANGUAGE CPP, OverloadedStrings #-}
#if defined(OFFICIAL_SERVER)
module EngineInteraction(replayToDemo, checkNetCmd, toEngineMsg, drawnMapData) where
#else
module EngineInteraction(checkNetCmd, toEngineMsg) where
#endif
import qualified Data.Set as Set
import Control.Monad
import qualified Codec.Binary.Base64 as Base64
import qualified Data.ByteString.Char8 as B
import qualified Data.ByteString as BW
import qualified Data.ByteString.Lazy as BL
import qualified Data.Map as Map
import qualified Data.List as L
import Data.Word
import Data.Bits
import Control.Arrow
import Data.Maybe
-------------
import CoreTypes
import Utils
#if defined(OFFICIAL_SERVER)
{-
this is snippet from http://stackoverflow.com/questions/10043102/how-to-catch-the-decompress-ioerror
because standard 'catch' doesn't seem to catch decompression errors for some reason
-}
import qualified Codec.Compression.Zlib.Internal as Z
decompressWithoutExceptions :: BL.ByteString -> Either String BL.ByteString
decompressWithoutExceptions = finalise
. Z.foldDecompressStream cons nil err
. Z.decompressWithErrors Z.zlibFormat Z.defaultDecompressParams
where err _ msg = Left msg
nil = Right []
cons chunk = right (chunk :)
finalise = right BL.fromChunks
{- end snippet -}
#endif
toEngineMsg :: B.ByteString -> B.ByteString
toEngineMsg msg = B.pack $ Base64.encode (fromIntegral (BW.length msg) : BW.unpack msg)
{-fromEngineMsg :: B.ByteString -> Maybe B.ByteString
fromEngineMsg msg = liftM BW.pack (Base64.decode (B.unpack msg) >>= removeLength)
where
removeLength (x:xs) = if length xs == fromIntegral x then Just xs else Nothing
removeLength _ = Nothing-}
em :: B.ByteString -> B.ByteString
em = toEngineMsg
eml :: [B.ByteString] -> B.ByteString
eml = em . B.concat
splitMessages :: B.ByteString -> [B.ByteString]
splitMessages = L.unfoldr (\b -> if B.null b then Nothing else Just $ B.splitAt (1 + fromIntegral (BW.head b)) b)
checkNetCmd :: B.ByteString -> (B.ByteString, B.ByteString, Maybe (Maybe B.ByteString))
checkNetCmd msg = check decoded
where
decoded = liftM (splitMessages . BW.pack) $ Base64.decode $ B.unpack msg
check Nothing = (B.empty, B.empty, Nothing)
check (Just msgs) = let (a, b) = (filter isLegal msgs, filter isNonEmpty a) in (encode a, encode b, lft a)
encode = B.pack . Base64.encode . BW.unpack . B.concat
isLegal m = (B.length m > 1) && (flip Set.member legalMessages . B.head . B.tail $ m)
lft = foldr l Nothing
l m n = let m' = B.head $ B.tail m; tst = flip Set.member in
if not $ tst timedMessages m' then n
else if '+' /= m' then Just Nothing else Just . Just . B.pack . Base64.encode . BW.unpack $ m
isNonEmpty = (/=) '+' . B.head . B.tail
legalMessages = Set.fromList $ "M#+LlRrUuDdZzAaSjJ,sNpPwtgfhbc12345" ++ slotMessages
slotMessages = "\128\129\130\131\132\133\134\135\136\137\138"
timedMessages = Set.fromList $ "+LlRrUuDdZzAaSjJ,NpPwtgfc12345" ++ slotMessages
#if defined(OFFICIAL_SERVER)
replayToDemo :: [TeamInfo]
-> Map.Map B.ByteString B.ByteString
-> Map.Map B.ByteString [B.ByteString]
-> [B.ByteString]
-> [B.ByteString]
replayToDemo ti mParams prms msgs = if not sane then [] else concat [
[em "TD"]
, maybeScript
, maybeMap
, [eml ["etheme ", head $ prms Map.! "THEME"]]
, [eml ["eseed ", mParams Map.! "SEED"]]
, [eml ["e$gmflags ", showB gameFlags]]
, schemeFlags
, schemeAdditional
, [eml ["e$template_filter ", mParams Map.! "TEMPLATE"]]
, [eml ["e$feature_size ", mParams Map.! "FEATURE_SIZE"]]
, [eml ["e$mapgen ", mapgen]]
, mapgenSpecific
, concatMap teamSetup ti
, msgs
, [em "!"]
]
where
keys1, keys2 :: Set.Set B.ByteString
keys1 = Set.fromList ["FEATURE_SIZE", "MAP", "MAPGEN", "MAZE_SIZE", "SEED", "TEMPLATE"]
keys2 = Set.fromList ["AMMO", "SCHEME", "SCRIPT", "THEME"]
sane = Set.null (keys1 Set.\\ Map.keysSet mParams)
&& Set.null (keys2 Set.\\ Map.keysSet prms)
&& (not . null . drop 41 $ scheme)
&& (not . null . tail $ prms Map.! "AMMO")
mapGenTypes = ["+rnd+", "+maze+", "+drawn+", "+perlin+"]
maybeScript = let s = head . fromMaybe ["Normal"] $ Map.lookup "SCRIPT" prms in if s == "Normal" then [] else [eml ["escript Scripts/Multiplayer/", s, ".lua"]]
maybeMap = let m = mParams Map.! "MAP" in if m `elem` mapGenTypes then [] else [eml ["emap ", m]]
scheme = tail $ prms Map.! "SCHEME"
mapgen = mParams Map.! "MAPGEN"
mazeSizeMsg = eml ["e$maze_size ", mParams Map.! "MAZE_SIZE"]
mapgenSpecific = case mapgen of
"1" -> [mazeSizeMsg]
"2" -> [mazeSizeMsg]
"3" -> let d = head . fromMaybe [""] $ Map.lookup "DRAWNMAP" prms in if BW.length d <= 4 then [] else drawnMapData d
_ -> []
gameFlags :: Word32
gameFlags = foldl (\r (b, f) -> if b == "false" then r else r .|. f) 0 $ zip scheme gameFlagConsts
schemeFlags = map (\(v, (n, m)) -> eml [n, " ", showB $ (readInt_ v) * m])
$ filter (\(_, (n, _)) -> not $ B.null n)
$ zip (drop (length gameFlagConsts) scheme) schemeParams
schemeAdditional = let scriptParam = B.tail $ scheme !! 41 in [eml ["e$scriptparam ", scriptParam] | not $ B.null scriptParam]
ammoStr :: B.ByteString
ammoStr = head . tail $ prms Map.! "AMMO"
ammo = let l = B.length ammoStr `div` 4; ((a, b), (c, d)) = (B.splitAt l . fst &&& B.splitAt l . snd) . B.splitAt (l * 2) $ ammoStr in
(map (\(x, y) -> eml [x, " ", y]) $ zip ["eammloadt", "eammprob", "eammdelay", "eammreinf"] [a, b, c, d])
++ [em "eammstore" | scheme !! 14 == "true" || scheme !! 20 == "false"]
initHealth = scheme !! 27
teamSetup :: TeamInfo -> [B.ByteString]
teamSetup t = (++) ammo $
eml ["eaddteam <hash> ", showB $ (1 + (readInt_ $ teamcolor t) :: Int) * 2113696, " ", teamname t]
: em "erdriven"
: eml ["efort ", teamfort t]
: take (2 * hhnum t) (
concatMap (\(HedgehogInfo hname hhat) -> [
eml ["eaddhh ", showB $ difficulty t, " ", initHealth, " ", hname]
, eml ["ehat ", hhat]
])
$ hedgehogs t
)
drawnMapData :: B.ByteString -> [B.ByteString]
drawnMapData =
L.map (\m -> eml ["edraw ", BW.pack m])
. L.unfoldr by200
. BL.unpack
. either (const BL.empty) id
. decompressWithoutExceptions
. BL.pack
. L.drop 4
. fromMaybe []
. Base64.decode
. B.unpack
where
by200 :: [a] -> Maybe ([a], [a])
by200 [] = Nothing
by200 m = Just $ L.splitAt 200 m
schemeParams :: [(B.ByteString, Int)]
schemeParams = [
("e$damagepct", 1)
, ("e$turntime", 1000)
, ("", 0)
, ("e$sd_turns", 1)
, ("e$casefreq", 1)
, ("e$minestime", 1000)
, ("e$minesnum", 1)
, ("e$minedudpct", 1)
, ("e$explosives", 1)
, ("e$healthprob", 1)
, ("e$hcaseamount", 1)
, ("e$waterrise", 1)
, ("e$healthdec", 1)
, ("e$ropepct", 1)
, ("e$getawaytime", 1)
, ("e$worldedge", 1)
]
gameFlagConsts :: [Word32]
gameFlagConsts = [
0x00001000
, 0x00000010
, 0x00000004
, 0x00000008
, 0x00000020
, 0x00000040
, 0x00000080
, 0x00000100
, 0x00000200
, 0x00000400
, 0x00000800
, 0x00002000
, 0x00004000
, 0x00008000
, 0x00010000
, 0x00020000
, 0x00040000
, 0x00080000
, 0x00100000
, 0x00200000
, 0x00400000
, 0x00800000
, 0x01000000
, 0x02000000
, 0x04000000
]
#endif