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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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33
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 qualified Ledger.Typed.Scripts as Scripts
import Ledger.Value as Value
import Ledger.Ada as Ada
import Plutus.Contracts.Currency as Currency
import Prelude (Semigroup (..))
@ -73,20 +74,25 @@ oracleValue o f = do
{-# INLINABLE mkOracleValidator #-}
mkOracleValidator :: Oracle -> Integer -> OracleRedeemer -> ScriptContext -> Bool
mkOracleValidator _ _ Use _ = True
mkOracleValidator oracle _ Update ctx =
traceIfFalse "operator signature missing" (txSignedBy info $ oOperator oracle) &&
mkOracleValidator oracle x r ctx =
traceIfFalse "token missing from input" inputHasToken &&
traceIfFalse "token missing from output" outputHasToken &&
case r of
Update -> traceIfFalse "operator signature missing" (txSignedBy info $ oOperator oracle) &&
traceIfFalse "invalid output datum" validOutputDatum
Use -> traceIfFalse "oracle value changed" (outputDatum == Just x) &&
traceIfFalse "fees not paid" feesPaid
where
info :: TxInfo
info = scriptContextTxInfo ctx
ownInput :: TxOut
ownInput = case findOwnInput ctx of
Nothing -> traceError "oracle input missing"
Just i -> txInInfoResolved i
inputHasToken :: Bool
inputHasToken = case findOwnInput ctx of
Nothing -> False
Just i -> assetClassValueOf (txOutValue $ txInInfoResolved i) (oracleAsset oracle) == 1
inputHasToken = assetClassValueOf (txOutValue ownInput) (oracleAsset oracle) == 1
ownOutput :: TxOut
ownOutput = case getContinuingOutputs ctx of
@ -96,10 +102,19 @@ mkOracleValidator oracle _ Update ctx =
outputHasToken :: Bool
outputHasToken = assetClassValueOf (txOutValue ownOutput) (oracleAsset oracle) == 1
outputDatum :: Maybe Integer
outputDatum = oracleValue ownOutput (`findDatum` info)
validOutputDatum :: Bool
validOutputDatum = case oracleValue ownOutput (`findDatum` info) of
Nothing -> False
Just _ -> True
validOutputDatum = isJust outputDatum
feesPaid :: Bool
feesPaid =
let
inVal = txOutValue ownInput
outVal = txOutValue ownOutput
in
outVal `geq` (inVal <> Ada.lovelaceValueOf (oFee oracle))
data Oracling
instance Scripts.ScriptType Oracling where