67 lines
1.7 KiB
Haskell
67 lines
1.7 KiB
Haskell
module PersistSHA1 where
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import ClassyPrelude.Yesod
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import Database.Persist.Sql
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import qualified Data.ByteString as B
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import qualified Data.ByteString.Char8 as BC
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import qualified Data.Text as T
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import Numeric (showHex)
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data SHA1 = SHA1 ByteString
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deriving (Eq, Show)
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toHex :: ByteString -> ByteString
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toHex = BC.pack . concat . (map ("\\x"++)) . (map (flip showHex "")) . B.unpack
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toSHA1 :: ByteString -> SHA1
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toSHA1 x = SHA1 $ B.concat ["E'\\\\x", x, "'"]
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fromTextToSHA1 :: Text -> SHA1
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fromTextToSHA1 = SHA1 . B.pack . (map hexByteToWord8) . (T.chunksOf 2)
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fromSHA1ToText :: SHA1 -> Text
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fromSHA1ToText (SHA1 bs) = T.pack $ concat $ map word8ToHex $ B.unpack bs
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hexByteToWord8 :: Text -> Word8
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hexByteToWord8 t = (hexNibbleToWord8 $ T.head t) * 16 + (hexNibbleToWord8 $ T.index t 1)
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word8ToHex :: Word8 -> String
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word8ToHex e = case h of
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[c] -> ['0', c]
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s -> s
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where h = showHex e ""
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hexNibbleToWord8 :: Char -> Word8
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hexNibbleToWord8 '0' = 0
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hexNibbleToWord8 '1' = 1
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hexNibbleToWord8 '2' = 2
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hexNibbleToWord8 '3' = 3
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hexNibbleToWord8 '4' = 4
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hexNibbleToWord8 '5' = 5
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hexNibbleToWord8 '6' = 6
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hexNibbleToWord8 '7' = 7
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hexNibbleToWord8 '8' = 8
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hexNibbleToWord8 '9' = 9
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hexNibbleToWord8 'A' = 10
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hexNibbleToWord8 'a' = 10
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hexNibbleToWord8 'B' = 11
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hexNibbleToWord8 'b' = 11
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hexNibbleToWord8 'C' = 12
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hexNibbleToWord8 'c' = 12
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hexNibbleToWord8 'D' = 13
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hexNibbleToWord8 'd' = 13
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hexNibbleToWord8 'E' = 14
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hexNibbleToWord8 'e' = 14
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hexNibbleToWord8 'F' = 15
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hexNibbleToWord8 'f' = 15
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instance PersistField SHA1 where
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toPersistValue (SHA1 t) = PersistByteString t
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fromPersistValue (PersistByteString t) = Right $ SHA1 t
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fromPersistValue _ = Left "Unexpected value"
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instance PersistFieldSql SHA1 where
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sqlType _ = SqlBlob
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