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{-# LANGUAGE FlexibleInstances #-}
module Hash where
import Types
import qualified Data.ByteString as B
import qualified Data.ByteString.Char8 as C8
import qualified Crypto.Hash as H
-- | Encode a hash pointer using base16 format.
encodeHashPointer :: HashPointer -> B.ByteString
encodeHashPointer (HashPointer d) = C8.pack (show d)
class Hashable a where
hash :: a -> HashPointer
instance Hashable B.ByteString where
hash = HashPointer . H.hash
-- | Hash the concacenation of the hashes, encoding them in base16 format.
instance Hashable [HashPointer] where
hash = hash . B.concat . map encodeHashPointer
instance Hashable a => Hashable (Activity a) where
hash (Activity a p s) = hash [hash a, p, hash s]
hash (StartActivity a s) = hash [hash a, hash s]
instance Hashable Entered where
hash v = hash [hash (enteredData v), hash (echoData v)]
instance Hashable Seen where
hash v = hash [hash (seenData v)]
instance Hashable Signature where
hash (Signature s) = hash s
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