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completed oracle validation

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Lars Brünjes 2021-05-09 22:39:44 +02:00
parent e5fa37a0b5
commit af90b54f0e
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1 changed files with 27 additions and 12 deletions
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39
code/week06/src/Week06/Oracle/Core.hs
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@ -39,6 +39,7 @@ import Ledger hiding (singleton)
import Ledger.Constraints as Constraints import Ledger.Constraints as Constraints
import qualified Ledger.Typed.Scripts as Scripts import qualified Ledger.Typed.Scripts as Scripts
import Ledger.Value as Value import Ledger.Value as Value
import Ledger.Ada as Ada
import Plutus.Contracts.Currency as Currency import Plutus.Contracts.Currency as Currency
import Prelude (Semigroup (..)) import Prelude (Semigroup (..))
@ -73,20 +74,25 @@ oracleValue o f = do
{-# INLINABLE mkOracleValidator #-} {-# INLINABLE mkOracleValidator #-}
mkOracleValidator :: Oracle -> Integer -> OracleRedeemer -> ScriptContext -> Bool mkOracleValidator :: Oracle -> Integer -> OracleRedeemer -> ScriptContext -> Bool
mkOracleValidator _ _ Use _ = True mkOracleValidator oracle x r ctx =
mkOracleValidator oracle _ Update ctx = traceIfFalse "token missing from input" inputHasToken &&
traceIfFalse "operator signature missing" (txSignedBy info $ oOperator oracle) && traceIfFalse "token missing from output" outputHasToken &&
traceIfFalse "token missing from input" inputHasToken && case r of
traceIfFalse "token missing from output" outputHasToken && Update -> traceIfFalse "operator signature missing" (txSignedBy info $ oOperator oracle) &&
traceIfFalse "invalid output datum" validOutputDatum traceIfFalse "invalid output datum" validOutputDatum
Use -> traceIfFalse "oracle value changed" (outputDatum == Just x) &&
traceIfFalse "fees not paid" feesPaid
where where
info :: TxInfo info :: TxInfo
info = scriptContextTxInfo ctx info = scriptContextTxInfo ctx
ownInput :: TxOut
ownInput = case findOwnInput ctx of
Nothing -> traceError "oracle input missing"
Just i -> txInInfoResolved i
inputHasToken :: Bool inputHasToken :: Bool
inputHasToken = case findOwnInput ctx of inputHasToken = assetClassValueOf (txOutValue ownInput) (oracleAsset oracle) == 1
Nothing -> False
Just i -> assetClassValueOf (txOutValue $ txInInfoResolved i) (oracleAsset oracle) == 1
ownOutput :: TxOut ownOutput :: TxOut
ownOutput = case getContinuingOutputs ctx of ownOutput = case getContinuingOutputs ctx of
@ -96,10 +102,19 @@ mkOracleValidator oracle _ Update ctx =
outputHasToken :: Bool outputHasToken :: Bool
outputHasToken = assetClassValueOf (txOutValue ownOutput) (oracleAsset oracle) == 1 outputHasToken = assetClassValueOf (txOutValue ownOutput) (oracleAsset oracle) == 1
outputDatum :: Maybe Integer
outputDatum = oracleValue ownOutput (`findDatum` info)
validOutputDatum :: Bool validOutputDatum :: Bool
validOutputDatum = case oracleValue ownOutput (`findDatum` info) of validOutputDatum = isJust outputDatum
Nothing -> False
Just _ -> True feesPaid :: Bool
feesPaid =
let
inVal = txOutValue ownInput
outVal = txOutValue ownOutput
in
outVal `geq` (inVal <> Ada.lovelaceValueOf (oFee oracle))
data Oracling data Oracling
instance Scripts.ScriptType Oracling where instance Scripts.ScriptType Oracling where