zcash-haskell/src/ZcashHaskell/Sapling.hs

module ZcashHaskell.Sapling where

import C.Zcash
  ( rustWrapperIsShielded
  , rustWrapperSaplingCheck
  , rustWrapperSaplingNoteDecode
  , rustWrapperSaplingVkDecode
  )
import qualified Data.ByteString as BS
import Foreign.Rust.Marshall.Variable (withPureBorshVarBuffer)
import ZcashHaskell.Types (DecodedNote(..), ShieldedOutput)

-- | Check if given bytesting is a valid encoded shielded address
isValidShieldedAddress :: BS.ByteString -> Bool
isValidShieldedAddress = rustWrapperIsShielded

-- | Check if given bytestring is a valid Sapling viewing key
isValidSaplingViewingKey :: BS.ByteString -> Bool
isValidSaplingViewingKey = rustWrapperSaplingVkDecode

-- | Check if the given bytestring for the Sapling viewing key matches the second bytestring for the address
matchSaplingAddress :: BS.ByteString -> BS.ByteString -> Bool
matchSaplingAddress = rustWrapperSaplingCheck

-- | Attempt to decode the given Sapling raw output with the given Sapling viewing key
decodeSaplingOutput :: BS.ByteString -> ShieldedOutput -> Maybe DecodedNote
decodeSaplingOutput key out =
  case a_value decodedAction of
    0 -> Nothing
    _ -> Just decodedAction
  where
    decodedAction =
      withPureBorshVarBuffer $ rustWrapperSaplingNoteDecode key out