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{- Simple Base64 encoding of Strings
-
- Note that this uses the FileSystemEncoding, so it can be used on Strings
- that repesent filepaths containing arbitrarily encoded characters.
-
- Copyright 2011, 2015 Joey Hess <id@joeyh.name>
-
- License: BSD-2-clause
-}
module Utility.Base64 (toB64, fromB64Maybe, fromB64, prop_b64_roundtrips) where
import qualified "sandi" Codec.Binary.Base64 as B64
import Data.Maybe
import qualified Data.ByteString.Lazy as L
import Data.ByteString.UTF8 (fromString, toString)
import Utility.FileSystemEncoding
toB64 :: String -> String
toB64 = toString . B64.encode . L.toStrict . encodeBS
fromB64Maybe :: String -> Maybe String
fromB64Maybe s = either (const Nothing) (Just . decodeBS . L.fromStrict)
(B64.decode $ fromString s)
fromB64 :: String -> String
fromB64 = fromMaybe bad . fromB64Maybe
where
bad = error "bad base64 encoded data"
prop_b64_roundtrips :: String -> Bool
prop_b64_roundtrips s = s == fromB64 (toB64 s)
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