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sample solutions for week 5
This commit is contained in:
Lars Brünjes
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commit
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3 changed files with 202 additions and 0 deletions
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@ -15,6 +15,8 @@ library
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, Week05.Homework2
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, Week05.NFT
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, Week05.Signed
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, Week05.Solution1
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, Week05.Solution2
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build-depends: aeson
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, base ^>=4.14.1.0
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, containers
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104
code/week05/src/Week05/Solution1.hs
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104
code/week05/src/Week05/Solution1.hs
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@ -0,0 +1,104 @@
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{-# LANGUAGE DataKinds #-}
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{-# LANGUAGE DeriveAnyClass #-}
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{-# LANGUAGE DeriveGeneric #-}
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{-# LANGUAGE FlexibleContexts #-}
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{-# LANGUAGE NoImplicitPrelude #-}
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{-# LANGUAGE OverloadedStrings #-}
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{-# LANGUAGE ScopedTypeVariables #-}
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{-# LANGUAGE TemplateHaskell #-}
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{-# LANGUAGE TypeApplications #-}
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{-# LANGUAGE TypeFamilies #-}
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{-# LANGUAGE TypeOperators #-}
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module Week05.Solution1 where
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import Control.Monad hiding (fmap)
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import Data.Aeson (ToJSON, FromJSON)
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import Data.Text (Text)
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import Data.Void (Void)
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import GHC.Generics (Generic)
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import Plutus.Contract as Contract hiding (when)
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import Plutus.Trace.Emulator as Emulator
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import qualified PlutusTx
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import PlutusTx.Prelude hiding (Semigroup(..), unless)
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import Ledger hiding (singleton)
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import Ledger.Constraints as Constraints
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import qualified Ledger.Typed.Scripts as Scripts
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import Ledger.Value as Value
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import Playground.Contract (printJson, printSchemas, ensureKnownCurrencies, stage, ToSchema)
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import Playground.TH (mkKnownCurrencies, mkSchemaDefinitions)
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import Playground.Types (KnownCurrency (..))
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import Prelude (Semigroup (..))
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import Text.Printf (printf)
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import Wallet.Emulator.Wallet
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{-# INLINABLE mkPolicy #-}
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mkPolicy :: PubKeyHash -> Slot -> ScriptContext -> Bool
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mkPolicy pkh deadline ctx =
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traceIfFalse "signature missing" (txSignedBy info pkh) &&
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traceIfFalse "deadline missed" (to deadline `contains` txInfoValidRange info)
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where
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info = scriptContextTxInfo ctx
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policy :: PubKeyHash -> Slot -> Scripts.MonetaryPolicy
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policy pkh deadline = mkMonetaryPolicyScript $
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$$(PlutusTx.compile [|| \pkh' deadline' -> Scripts.wrapMonetaryPolicy $ mkPolicy pkh' deadline' ||])
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`PlutusTx.applyCode`
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PlutusTx.liftCode pkh
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`PlutusTx.applyCode`
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PlutusTx.liftCode deadline
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curSymbol :: PubKeyHash -> Slot -> CurrencySymbol
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curSymbol pkh deadline = scriptCurrencySymbol $ policy pkh deadline
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data MintParams = MintParams
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{ mpTokenName :: !TokenName
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, mpDeadline :: !Slot
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, mpAmount :: !Integer
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} deriving (Generic, ToJSON, FromJSON, ToSchema)
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type SignedSchema =
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BlockchainActions
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.\/ Endpoint "mint" MintParams
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mint :: MintParams -> Contract w SignedSchema Text ()
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mint mp = do
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pkh <- pubKeyHash <$> Contract.ownPubKey
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now <- Contract.currentSlot
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let deadline = mpDeadline mp
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if now > deadline
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then Contract.logError @String "deadline passed"
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else do
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let val = Value.singleton (curSymbol pkh deadline) (mpTokenName mp) (mpAmount mp)
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lookups = Constraints.monetaryPolicy $ policy pkh deadline
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tx = Constraints.mustForgeValue val <> Constraints.mustValidateIn (to deadline)
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ledgerTx <- submitTxConstraintsWith @Void lookups tx
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void $ awaitTxConfirmed $ txId ledgerTx
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Contract.logInfo @String $ printf "forged %s" (show val)
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endpoints :: Contract () SignedSchema Text ()
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endpoints = mint' >> endpoints
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where
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mint' = endpoint @"mint" >>= mint
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mkSchemaDefinitions ''SignedSchema
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mkKnownCurrencies []
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test :: IO ()
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test = runEmulatorTraceIO $ do
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let tn = "ABC"
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deadline = 10
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h <- activateContractWallet (Wallet 1) endpoints
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callEndpoint @"mint" h $ MintParams
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{ mpTokenName = tn
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, mpDeadline = deadline
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, mpAmount = 555
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}
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void $ Emulator.waitNSlots 15
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callEndpoint @"mint" h $ MintParams
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{ mpTokenName = tn
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, mpDeadline = deadline
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, mpAmount = 555
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}
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void $ Emulator.waitNSlots 1
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96
code/week05/src/Week05/Solution2.hs
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96
code/week05/src/Week05/Solution2.hs
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@ -0,0 +1,96 @@
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{-# LANGUAGE DataKinds #-}
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{-# LANGUAGE DeriveAnyClass #-}
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{-# LANGUAGE DeriveGeneric #-}
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{-# LANGUAGE FlexibleContexts #-}
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{-# LANGUAGE NoImplicitPrelude #-}
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{-# LANGUAGE OverloadedStrings #-}
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{-# LANGUAGE ScopedTypeVariables #-}
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{-# LANGUAGE TemplateHaskell #-}
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{-# LANGUAGE TypeApplications #-}
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{-# LANGUAGE TypeFamilies #-}
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{-# LANGUAGE TypeOperators #-}
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module Week05.Solution2 where
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import Control.Monad hiding (fmap)
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import qualified Data.Map as Map
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import Data.Text (Text)
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import Data.Void (Void)
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import Plutus.Contract as Contract hiding (when)
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import Plutus.Trace.Emulator as Emulator
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import qualified PlutusTx
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import PlutusTx.Prelude hiding (Semigroup(..), unless)
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import Ledger hiding (singleton)
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import Ledger.Constraints as Constraints
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import qualified Ledger.Typed.Scripts as Scripts
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import Ledger.Value as Value
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import Playground.Contract (printJson, printSchemas, ensureKnownCurrencies, stage, ToSchema)
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import Playground.TH (mkKnownCurrencies, mkSchemaDefinitions)
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import Playground.Types (KnownCurrency (..))
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import Prelude (Semigroup (..))
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import Text.Printf (printf)
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import Wallet.Emulator.Wallet
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{-# INLINABLE tn #-}
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tn :: TokenName
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tn = TokenName emptyByteString
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{-# INLINABLE mkPolicy #-}
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mkPolicy :: TxOutRef -> ScriptContext -> Bool
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mkPolicy oref ctx = traceIfFalse "UTxO not consumed" hasUTxO &&
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traceIfFalse "wrong amount minted" checkMintedAmount
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where
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info :: TxInfo
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info = scriptContextTxInfo ctx
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hasUTxO :: Bool
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hasUTxO = any (\i -> txInInfoOutRef i == oref) $ txInfoInputs info
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checkMintedAmount :: Bool
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checkMintedAmount = case flattenValue (txInfoForge info) of
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[(cs, tn', amt)] -> cs == ownCurrencySymbol ctx && tn' == tn && amt == 1
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_ -> False
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policy :: TxOutRef -> Scripts.MonetaryPolicy
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policy oref = mkMonetaryPolicyScript $
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$$(PlutusTx.compile [|| Scripts.wrapMonetaryPolicy . mkPolicy ||])
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`PlutusTx.applyCode`
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PlutusTx.liftCode oref
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curSymbol :: TxOutRef -> CurrencySymbol
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curSymbol = scriptCurrencySymbol . policy
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type NFTSchema =
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BlockchainActions
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.\/ Endpoint "mint" ()
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mint :: Contract w NFTSchema Text ()
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mint = do
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pk <- Contract.ownPubKey
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utxos <- utxoAt (pubKeyAddress pk)
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case Map.keys utxos of
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[] -> Contract.logError @String "no utxo found"
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oref : _ -> do
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let val = Value.singleton (curSymbol oref) tn 1
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lookups = Constraints.monetaryPolicy (policy oref) <> Constraints.unspentOutputs utxos
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tx = Constraints.mustForgeValue val <> Constraints.mustSpendPubKeyOutput oref
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ledgerTx <- submitTxConstraintsWith @Void lookups tx
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void $ awaitTxConfirmed $ txId ledgerTx
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Contract.logInfo @String $ printf "forged %s" (show val)
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endpoints :: Contract () NFTSchema Text ()
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endpoints = mint' >> endpoints
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where
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mint' = endpoint @"mint" >> mint
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mkSchemaDefinitions ''NFTSchema
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mkKnownCurrencies []
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test :: IO ()
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test = runEmulatorTraceIO $ do
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h1 <- activateContractWallet (Wallet 1) endpoints
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h2 <- activateContractWallet (Wallet 2) endpoints
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callEndpoint @"mint" h1 ()
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callEndpoint @"mint" h2 ()
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void $ Emulator.waitNSlots 1
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