106 lines
2.4 KiB
Haskell
106 lines
2.4 KiB
Haskell
module Language.Haskell.Brittany.Internal.Obfuscation
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( obfuscate
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)
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where
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import Language.Haskell.Brittany.Internal.Prelude
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import Language.Haskell.Brittany.Internal.PreludeUtils
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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 qualified Data.Text as Text
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import qualified GHC.OldList as List
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import Data.Char
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import System.Random
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obfuscate :: Text -> IO Text
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obfuscate input = do
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let predi x = isAlphaNum x || x `elem` "_'"
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let groups = List.groupBy (\a b -> predi a && predi b) (Text.unpack input)
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let idents = Set.toList $ Set.fromList $ filter (all predi) groups
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let exceptionFilter x | x `elem` keywords = False
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exceptionFilter x | x `elem` extraKWs = False
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exceptionFilter x = not $ null $ drop 1 x
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let filtered = filter exceptionFilter idents
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mappings <- fmap Map.fromList $ filtered `forM` \x -> do
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r <- createAlias x
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pure (x, r)
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let groups' = groups <&> \w -> fromMaybe w (Map.lookup w mappings)
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pure $ Text.concat $ fmap Text.pack groups'
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keywords :: [String]
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keywords =
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[ "case"
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, "class"
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, "data"
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, "default"
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, "deriving"
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, "do"
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, "mdo"
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, "else"
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, "forall"
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, "if"
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, "import"
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, "in"
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, "infix"
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, "infixl"
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, "infixr"
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, "instance"
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, "let"
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, "module"
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, "newtype"
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, "of"
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, "qualified"
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, "then"
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, "type"
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, "where"
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, "_"
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, "foreign"
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, "ccall"
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, "as"
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, "safe"
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, "unsafe"
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, "hiding"
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, "proc"
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, "rec"
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, "family"
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]
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extraKWs :: [String]
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extraKWs = ["return", "pure", "Int", "True", "False", "otherwise"]
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createAlias :: String -> IO String
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createAlias xs = go NoHint xs
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where
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go _hint "" = pure ""
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go hint (c : cr) = do
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c' <- case hint of
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VocalHint | isUpper c -> randomFrom $ "AAAEEEOOOIIIUUU" ++ ['A' .. 'Z']
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_ | isUpper c -> randomFrom ['A' .. 'Z']
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VocalHint | isLower c -> randomFrom $ "aaaeeeoooiiiuuu" ++ ['a' .. 'z']
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_ | isLower c -> randomFrom ['a' .. 'z']
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_ -> pure c
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cr' <- go (if c' `elem` "aeuioAEUIO" then NoVocalHint else VocalHint) cr
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pure (c' : cr')
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data Hint = NoHint | VocalHint | NoVocalHint
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_randomRange :: Random a => a -> a -> IO a
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_randomRange lo hi = do
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gen <- getStdGen
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let (x, gen') = randomR (lo, hi) gen
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setStdGen gen'
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pure x
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randomFrom :: [a] -> IO a
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randomFrom l = do
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let hi = length l - 1
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gen <- getStdGen
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let (x, gen') = randomR (0, hi) gen
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setStdGen gen'
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pure $ l List.!! x
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