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bid validation
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1 changed files with 98 additions and 3 deletions
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@ -38,6 +38,7 @@ import GHC.Generics (Generic)
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import Plutus.Contract hiding (when)
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import qualified PlutusTx as PlutusTx
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import PlutusTx.Prelude hiding (Semigroup(..), unless)
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import qualified PlutusTx.Prelude as Plutus
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import Ledger hiding (singleton)
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import Ledger.Constraints as Constraints
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import qualified Ledger.Scripts as Scripts
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@ -55,8 +56,18 @@ data Auction = Auction
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{ aSeller :: !PubKeyHash
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, aDeadline :: !Slot
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, aMinBid :: !Integer
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, aCurrency :: !CurrencySymbol
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, aToken :: !TokenName
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} deriving (Show, Generic, ToJSON, FromJSON, ToSchema)
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instance Eq Auction where
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{-# INLINABLE (==) #-}
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a == b = (aSeller a == aSeller b) &&
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(aDeadline a == aDeadline b) &&
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(aMinBid a == aMinBid b) &&
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(aCurrency a == aCurrency b) &&
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(aToken a == aToken b)
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PlutusTx.unstableMakeIsData ''Auction
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PlutusTx.makeLift ''Auction
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@ -65,10 +76,15 @@ data Bid = Bid
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, bBid :: !Integer
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} deriving Show
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instance Eq Bid where
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{-# INLINABLE (==) #-}
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b == c = (bBidder b == bBidder c) &&
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(bBid b == bBid c)
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PlutusTx.unstableMakeIsData ''Bid
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PlutusTx.makeLift ''Bid
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data AuctionAction = Start Auction | MkBid Bid | Close
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data AuctionAction = MkBid Bid | Close
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deriving Show
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PlutusTx.unstableMakeIsData ''AuctionAction
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@ -95,7 +111,82 @@ minBid AuctionDatum{..} = case adHighestBid of
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{-# INLINABLE mkAuctionValidator #-}
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mkAuctionValidator :: AuctionDatum -> AuctionAction -> ValidatorCtx -> Bool
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mkAuctionValidator _ _ _ = True
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mkAuctionValidator ad redeemer ctx =
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traceIfFalse "wrong input value" correctInputValue &&
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case redeemer of
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MkBid b@Bid{..} ->
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traceIfFalse "bid too low" (sufficientBid bBid) &&
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traceIfFalse "wrong output datum" (correctOutputDatum b) &&
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traceIfFalse "wrong output value" (correctOutputValue bBid) &&
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traceIfFalse "wrong refund" correctRefund
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Close -> True
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where
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info :: TxInfo
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info = valCtxTxInfo ctx
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input :: TxInInfo
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input =
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let
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isScriptInput i = case txInInfoWitness i of
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Nothing -> False
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Just _ -> True
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xs = [i | i <- txInfoInputs info, isScriptInput i]
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in
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case xs of
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[i] -> i
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_ -> traceError "expected exactly one script input"
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inVal :: Value
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inVal = txInInfoValue input
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auction :: Auction
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auction = adAuction ad
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tokenValue :: Value
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tokenValue = Value.singleton (aCurrency auction) (aToken auction) 1
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correctInputValue :: Bool
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correctInputValue = inVal == case adHighestBid ad of
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Nothing -> tokenValue
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Just Bid{..} -> tokenValue Plutus.<> Ada.lovelaceValueOf bBid
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sufficientBid :: Integer -> Bool
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sufficientBid amount = amount >= minBid ad
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ownOutput :: TxOutInfo
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outputDatum :: AuctionDatum
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(ownOutput, outputDatum) = case getContinuingOutputs ctx of
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[o] -> case txOutType o of
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PayToPubKey -> traceError "wrong output type"
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PayToScript h -> case findDatum h info of
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Nothing -> traceError "datum not found"
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Just (Datum d) -> case PlutusTx.fromData d of
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Just ad' -> (o, ad')
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Nothing -> traceError "error decoding data"
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_ -> traceError "expected exactly one continuing output"
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correctOutputDatum :: Bid -> Bool
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correctOutputDatum b = (adAuction outputDatum == auction) &&
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(adHighestBid outputDatum == Just b)
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correctOutputValue :: Integer -> Bool
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correctOutputValue amount =
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txOutValue ownOutput == tokenValue Plutus.<> Ada.lovelaceValueOf amount
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correctRefund :: Bool
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correctRefund = case adHighestBid ad of
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Nothing -> True
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Just Bid{..} ->
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let
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os = [ o
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| o <- txInfoOutputs info
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, txOutAddress o == PubKeyAddress bBidder
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]
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in
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case os of
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[o] -> txOutValue o == Ada.lovelaceValueOf bBid
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_ -> traceError "expected exactly one refund output"
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auctionInstance :: Scripts.ScriptInstance Auctioning
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auctionInstance = Scripts.validator @Auctioning
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@ -144,6 +235,8 @@ start StartParams{..} = do
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{ aSeller = pkh
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, aDeadline = spDeadline
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, aMinBid = spMinBid
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, aCurrency = spCurrency
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, aToken = spToken
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}
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d = AuctionDatum
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{ adAuction = a
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@ -231,7 +324,9 @@ findAuction cs tn = do
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Nothing -> throwError "datum not found"
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Just (Datum e) -> case PlutusTx.fromData e of
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Nothing -> throwError "datum has wrong type"
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Just d -> return (oref, o, d)
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Just d@AuctionDatum{..}
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| aCurrency adAuction == cs && aToken adAuction == tn -> return (oref, o, d)
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| otherwise -> throwError "auction token missmatch"
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_ -> throwError "auction utxo not found"
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endpoints :: Contract () AuctionSchema Text ()
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