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README.md
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- The `EmulatorTrace`-monad.
- The `Contract`-monad.
- [Lecture #5](https://youtu.be/SsaVjSsPPcg)
- Values.
- Native Tokens.
- NFT's.
## Code Examples
- Lecture #1: [English Auction](code/week01)
- Lecture #2: [Simple validation](code/week02)
- Lecture #3: [Script Context & Parameterized Contracts](code/week03)
- Lecture #4: [Monad, Traces & Contracts](code/week04)
- Lecture #5: [Native Tokens](code/week05)
## Exercises
@ -74,6 +81,11 @@
- Implement function `payTrace` in the [Homework](code/week04/src/Week04/Homework.hs) module.
- Handle exceptions thrown by `submitTx` in function `payContract` in the same module.
- Week #5
- Add a deadline to the minting policy in the [Homework1](code/week05/src/Week05/Homework1.hs) module.
- Fix the token name to the empty ByteString in the NFT contract in the [Homework2](code/week05/src/Week05/Homework2.hs) module.
## Some Plutus Modules
- [`Language.Marlowe.Semantics`](https://github.com/input-output-hk/plutus/blob/master/marlowe/src/Language/Marlowe/Semantics.hs), contains Marlowe types and semantics.

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{
"name": "Plutus Starter Project",
"image": "plutus-devcontainer:latest",
"remoteUser": "plutus",
"mounts": [
// This shares cabal's remote repository state with the host. We don't mount the whole of '.cabal', because
// 1. '.cabal/config' contains absolute paths that will only make sense on the host, and
// 2. '.cabal/store' is not necessarily portable to different version of cabal etc.
"source=${localEnv:HOME}/.cabal/packages,target=/home/plutus/.cabal/packages,type=bind,consistency=cached",
],
"settings": {
// Note: don't change from bash so it runs .bashrc
"terminal.integrated.shell.linux": "/bin/bash"
},
// IDs of extensions inside container
"extensions": [
"haskell.haskell"
],
}

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dist-newstyle/

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index-state: 2021-07-07T00:00:00Z
packages: ./.
-- You never, ever, want this.
write-ghc-environment-files: never
-- Always build tests and benchmarks.
tests: true
benchmarks: true
source-repository-package
type: git
location: https://github.com/input-output-hk/plutus.git
subdir:
freer-extras
playground-common
plutus-chain-index
plutus-core
plutus-contract
plutus-ledger
plutus-ledger-api
plutus-tx
plutus-tx-plugin
prettyprinter-configurable
quickcheck-dynamic
word-array
tag: 8f1a47674a99ac9bc2aba3231375d8d6de0641d2
-- The following sections are copied from the 'plutus' repository cabal.project at the revision
-- given above.
-- This is necessary because the 'plutus' libraries depend on a number of other libraries which are
-- not on Hackage, and so need to be pulled in as `source-repository-package`s themselves. Make sure to
-- re-update this section from the template when you do an upgrade.
-- This is also needed so evenful-sql-common will build with a
-- newer version of persistent. See stack.yaml for the mirrored
-- configuration.
package eventful-sql-common
ghc-options: -XDerivingStrategies -XStandaloneDeriving -XUndecidableInstances -XDataKinds -XFlexibleInstances -XMultiParamTypeClasses
allow-newer:
-- Pins to an old version of Template Haskell, unclear if/when it will be updated
size-based:template-haskell
-- The following two dependencies are needed by plutus.
, eventful-sql-common:persistent
, eventful-sql-common:persistent-template
, ouroboros-consensus-byron:formatting
, beam-core:aeson
, beam-sqlite:aeson
, beam-sqlite:dlist
, beam-migrate:aeson
constraints:
-- big breaking change here, inline-r doens't have an upper bound
singletons < 3.0
-- breaks eventful even more than it already was
, persistent-template < 2.12
-- bizarre issue: in earlier versions they define their own 'GEq', in newer
-- ones they reuse the one from 'some', but there isn't e.g. a proper version
-- constraint from dependent-sum-template (which is the library we actually use).
, dependent-sum > 0.6.2.0
-- See the note on nix/pkgs/default.nix:agdaPackages for why this is here.
-- (NOTE this will change to ieee754 in newer versions of nixpkgs).
extra-packages: ieee, filemanip
-- Drops an instance breaking our code. Should be released to Hackage eventually.
source-repository-package
type: git
location: https://github.com/Quid2/flat.git
tag: 95e5d7488451e43062ca84d5376b3adcc465f1cd
-- Needs some patches, but upstream seems to be fairly dead (no activity in > 1 year)
source-repository-package
type: git
location: https://github.com/shmish111/purescript-bridge.git
tag: 6a92d7853ea514be8b70bab5e72077bf5a510596
source-repository-package
type: git
location: https://github.com/shmish111/servant-purescript.git
tag: a76104490499aa72d40c2790d10e9383e0dbde63
source-repository-package
type: git
location: https://github.com/input-output-hk/cardano-crypto.git
tag: ce8f1934e4b6252084710975bd9bbc0a4648ece4
source-repository-package
type: git
location: https://github.com/input-output-hk/cardano-base
tag: a715c7f420770b70bbe95ca51d3dec83866cb1bd
subdir:
binary
binary/test
slotting
cardano-crypto-class
cardano-crypto-praos
cardano-crypto-tests
strict-containers
source-repository-package
type: git
location: https://github.com/input-output-hk/cardano-prelude
tag: fd773f7a58412131512b9f694ab95653ac430852
subdir:
cardano-prelude
cardano-prelude-test
source-repository-package
type: git
location: https://github.com/input-output-hk/ouroboros-network
tag: e338f2cf8e1078fbda9555dd2b169c6737ef6774
subdir:
monoidal-synchronisation
typed-protocols
typed-protocols-examples
ouroboros-network
ouroboros-network-testing
ouroboros-network-framework
ouroboros-consensus
ouroboros-consensus-byron
ouroboros-consensus-cardano
ouroboros-consensus-shelley
io-sim
io-classes
network-mux
source-repository-package
type: git
location: https://github.com/input-output-hk/iohk-monitoring-framework
tag: 34abfb7f4f5610cabb45396e0496472446a0b2ca
subdir:
iohk-monitoring
tracer-transformers
contra-tracer
plugins/backend-aggregation
plugins/backend-ekg
plugins/backend-monitoring
plugins/backend-trace-forwarder
plugins/scribe-systemd
source-repository-package
type: git
location: https://github.com/input-output-hk/cardano-ledger-specs
tag: 6b0fca7a73c317f3af7c14dd4dc38178cc78a6c8
subdir:
byron/chain/executable-spec
byron/crypto
byron/crypto/test
byron/ledger/executable-spec
byron/ledger/impl
byron/ledger/impl/test
semantics/executable-spec
semantics/small-steps-test
shelley/chain-and-ledger/dependencies/non-integer
shelley/chain-and-ledger/executable-spec
shelley/chain-and-ledger/shelley-spec-ledger-test
shelley-ma/impl
cardano-ledger-core
alonzo/impl
-- A lot of plutus dependencies have to be synchronized with the dependencies of
-- cardano-node. If you update cardano-node, please make sure that all dependencies
-- of cardano-node are also updated.
source-repository-package
type: git
location: https://github.com/input-output-hk/cardano-node.git
tag: f3ef4ed72894499160f2330b91572a159005c148
subdir:
cardano-api
cardano-node
cardano-cli
cardano-config
source-repository-package
type: git
location: https://github.com/input-output-hk/Win32-network
tag: 94153b676617f8f33abe8d8182c37377d2784bd1
source-repository-package
type: git
location: https://github.com/input-output-hk/hedgehog-extras
tag: 8bcd3c9dc22cc44f9fcfe161f4638a384fc7a187
-- The following dependencies are not mirrored in the
-- stack.yaml file, but they are needed regardless by cabal.
source-repository-package
type: git
location: https://github.com/input-output-hk/goblins
tag: cde90a2b27f79187ca8310b6549331e59595e7ba

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cradle:
cabal:
- path: "./src"
component: "lib:plutus-pioneer-program-week05"

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code/week05/plutus-pioneer-program-week05.cabal Normal file
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Cabal-Version: 2.4
Name: plutus-pioneer-program-week05
Version: 0.1.0.0
Author: Lars Bruenjes
Maintainer: brunjlar@gmail.com
Build-Type: Simple
Copyright: © 2021 Lars Bruenjes
License: Apache-2.0
License-files: LICENSE
library
hs-source-dirs: src
exposed-modules: Week05.Free
, Week05.Homework1
, Week05.Homework2
, Week05.NFT
, Week05.Signed
, Week05.Solution1
, Week05.Solution2
build-depends: aeson
, base ^>=4.14.1.0
, containers
, data-default
, freer-extras
, playground-common
, plutus-contract
, plutus-ledger
, plutus-ledger-api
, plutus-tx-plugin
, plutus-tx
, text
default-language: Haskell2010
ghc-options: -Wall -fobject-code -fno-ignore-interface-pragmas -fno-omit-interface-pragmas -fno-strictness -fno-spec-constr -fno-specialise

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{-# LANGUAGE DataKinds #-}
{-# LANGUAGE DeriveAnyClass #-}
{-# LANGUAGE DeriveGeneric #-}
{-# LANGUAGE FlexibleContexts #-}
{-# LANGUAGE NoImplicitPrelude #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE ScopedTypeVariables #-}
{-# LANGUAGE TemplateHaskell #-}
{-# LANGUAGE TypeApplications #-}
{-# LANGUAGE TypeFamilies #-}
{-# LANGUAGE TypeOperators #-}
module Week05.Free where
import Control.Monad hiding (fmap)
import Data.Aeson (ToJSON, FromJSON)
import Data.Text (Text)
import Data.Void (Void)
import GHC.Generics (Generic)
import Plutus.Contract as Contract
import Plutus.Trace.Emulator as Emulator
import qualified PlutusTx
import PlutusTx.Prelude hiding (Semigroup(..), unless)
import Ledger hiding (mint, singleton)
import Ledger.Constraints as Constraints
import qualified Ledger.Typed.Scripts as Scripts
import Ledger.Value as Value
import Playground.Contract (printJson, printSchemas, ensureKnownCurrencies, stage, ToSchema)
import Playground.TH (mkKnownCurrencies, mkSchemaDefinitions)
import Playground.Types (KnownCurrency (..))
import Prelude (IO, Show (..), String)
import Text.Printf (printf)
import Wallet.Emulator.Wallet
{-# INLINABLE mkPolicy #-}
mkPolicy :: () -> ScriptContext -> Bool
mkPolicy () _ = True
policy :: Scripts.MintingPolicy
policy = mkMintingPolicyScript $$(PlutusTx.compile [|| Scripts.wrapMintingPolicy mkPolicy ||])
curSymbol :: CurrencySymbol
curSymbol = scriptCurrencySymbol policy
data MintParams = MintParams
{ mpTokenName :: !TokenName
, mpAmount :: !Integer
} deriving (Generic, ToJSON, FromJSON, ToSchema)
type FreeSchema = Endpoint "mint" MintParams
mint :: MintParams -> Contract w FreeSchema Text ()
mint mp = do
let val = Value.singleton curSymbol (mpTokenName mp) (mpAmount mp)
lookups = Constraints.mintingPolicy policy
tx = Constraints.mustMintValue val
ledgerTx <- submitTxConstraintsWith @Void lookups tx
void $ awaitTxConfirmed $ txId ledgerTx
Contract.logInfo @String $ printf "forged %s" (show val)
endpoints :: Contract () FreeSchema Text ()
endpoints = mint' >> endpoints
where
mint' = endpoint @"mint" >>= mint
mkSchemaDefinitions ''FreeSchema
mkKnownCurrencies []
test :: IO ()
test = runEmulatorTraceIO $ do
let tn = "ABC"
h1 <- activateContractWallet (Wallet 1) endpoints
h2 <- activateContractWallet (Wallet 2) endpoints
callEndpoint @"mint" h1 $ MintParams
{ mpTokenName = tn
, mpAmount = 555
}
callEndpoint @"mint" h2 $ MintParams
{ mpTokenName = tn
, mpAmount = 444
}
void $ Emulator.waitNSlots 1
callEndpoint @"mint" h1 $ MintParams
{ mpTokenName = tn
, mpAmount = -222
}
void $ Emulator.waitNSlots 1

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{-# LANGUAGE DataKinds #-}
{-# LANGUAGE DeriveAnyClass #-}
{-# LANGUAGE DeriveGeneric #-}
{-# LANGUAGE FlexibleContexts #-}
{-# LANGUAGE NoImplicitPrelude #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE ScopedTypeVariables #-}
{-# LANGUAGE TemplateHaskell #-}
{-# LANGUAGE TypeApplications #-}
{-# LANGUAGE TypeFamilies #-}
{-# LANGUAGE TypeOperators #-}
module Week05.Homework1 where
import Control.Monad hiding (fmap)
import Control.Monad.Freer.Extras as Extras
import Data.Aeson (ToJSON, FromJSON)
import Data.Default (Default (..))
import Data.Text (Text)
import Data.Void (Void)
import GHC.Generics (Generic)
import Plutus.Contract as Contract
import Plutus.Trace.Emulator as Emulator
import qualified PlutusTx
import PlutusTx.Prelude hiding (Semigroup(..), unless)
import Ledger hiding (mint, singleton)
import Ledger.Constraints as Constraints
import Ledger.TimeSlot
import qualified Ledger.Typed.Scripts as Scripts
import Ledger.Value as Value
import Playground.Contract (printJson, printSchemas, ensureKnownCurrencies, stage, ToSchema)
import Playground.TH (mkKnownCurrencies, mkSchemaDefinitions)
import Playground.Types (KnownCurrency (..))
import Prelude (IO, Semigroup (..), Show (..), String, undefined)
import Text.Printf (printf)
import Wallet.Emulator.Wallet
{-# INLINABLE mkPolicy #-}
-- This policy should only allow minting (or burning) of tokens if the owner of the specified PubKeyHash
-- has signed the transaction and if the specified deadline has not passed.
mkPolicy :: PubKeyHash -> POSIXTime -> () -> ScriptContext -> Bool
mkPolicy pkh deadline () ctx = True -- FIX ME!
policy :: PubKeyHash -> POSIXTime -> Scripts.MintingPolicy
policy pkh deadline = undefined -- IMPLEMENT ME!
curSymbol :: PubKeyHash -> POSIXTime -> CurrencySymbol
curSymbol pkh deadline = undefined -- IMPLEMENT ME!
data MintParams = MintParams
{ mpTokenName :: !TokenName
, mpDeadline :: !POSIXTime
, mpAmount :: !Integer
} deriving (Generic, ToJSON, FromJSON, ToSchema)
type SignedSchema = Endpoint "mint" MintParams
mint :: MintParams -> Contract w SignedSchema Text ()
mint mp = do
pkh <- pubKeyHash <$> Contract.ownPubKey
now <- Contract.currentTime
let deadline = mpDeadline mp
if now > deadline
then Contract.logError @String "deadline passed"
else do
let val = Value.singleton (curSymbol pkh deadline) (mpTokenName mp) (mpAmount mp)
lookups = Constraints.mintingPolicy $ policy pkh deadline
tx = Constraints.mustMintValue val <> Constraints.mustValidateIn (to $ now + 5000)
ledgerTx <- submitTxConstraintsWith @Void lookups tx
void $ awaitTxConfirmed $ txId ledgerTx
Contract.logInfo @String $ printf "forged %s" (show val)
endpoints :: Contract () SignedSchema Text ()
endpoints = mint' >> endpoints
where
mint' = endpoint @"mint" >>= mint
mkSchemaDefinitions ''SignedSchema
mkKnownCurrencies []
test :: IO ()
test = runEmulatorTraceIO $ do
let tn = "ABC"
deadline = slotToBeginPOSIXTime def 10
h <- activateContractWallet (Wallet 1) endpoints
callEndpoint @"mint" h $ MintParams
{ mpTokenName = tn
, mpDeadline = deadline
, mpAmount = 555
}
void $ Emulator.waitNSlots 15
callEndpoint @"mint" h $ MintParams
{ mpTokenName = tn
, mpDeadline = deadline
, mpAmount = 555
}
void $ Emulator.waitNSlots 1

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{-# LANGUAGE DataKinds #-}
{-# LANGUAGE DeriveAnyClass #-}
{-# LANGUAGE DeriveGeneric #-}
{-# LANGUAGE FlexibleContexts #-}
{-# LANGUAGE NoImplicitPrelude #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE ScopedTypeVariables #-}
{-# LANGUAGE TemplateHaskell #-}
{-# LANGUAGE TypeApplications #-}
{-# LANGUAGE TypeFamilies #-}
{-# LANGUAGE TypeOperators #-}
module Week05.Homework2 where
import Control.Monad hiding (fmap)
import qualified Data.Map as Map
import Data.Text (Text)
import Data.Void (Void)
import Plutus.Contract as Contract
import Plutus.Trace.Emulator as Emulator
import qualified PlutusTx
import PlutusTx.Prelude hiding (Semigroup(..), unless)
import Ledger hiding (mint, singleton)
import Ledger.Constraints as Constraints
import qualified Ledger.Typed.Scripts as Scripts
import Ledger.Value as Value
import Playground.Contract (printJson, printSchemas, ensureKnownCurrencies, stage, ToSchema)
import Playground.TH (mkKnownCurrencies, mkSchemaDefinitions)
import Playground.Types (KnownCurrency (..))
import Prelude (IO, Semigroup (..), Show (..), String, undefined)
import Text.Printf (printf)
import Wallet.Emulator.Wallet
{-# INLINABLE mkPolicy #-}
-- Minting policy for an NFT, where the minting transaction must consume the given UTxO as input
-- and where the TokenName will be the empty ByteString.
mkPolicy :: TxOutRef -> () -> ScriptContext -> Bool
mkPolicy oref () ctx = True -- FIX ME!
policy :: TxOutRef -> Scripts.MintingPolicy
policy oref = undefined -- IMPLEMENT ME!
curSymbol :: TxOutRef -> CurrencySymbol
curSymbol = undefined -- IMPLEMENT ME!
type NFTSchema = Endpoint "mint" ()
mint :: Contract w NFTSchema Text ()
mint = undefined -- IMPLEMENT ME!
endpoints :: Contract () NFTSchema Text ()
endpoints = mint' >> endpoints
where
mint' = endpoint @"mint" >> mint
mkSchemaDefinitions ''NFTSchema
mkKnownCurrencies []
test :: IO ()
test = runEmulatorTraceIO $ do
h1 <- activateContractWallet (Wallet 1) endpoints
h2 <- activateContractWallet (Wallet 2) endpoints
callEndpoint @"mint" h1 ()
callEndpoint @"mint" h2 ()
void $ Emulator.waitNSlots 1

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{-# LANGUAGE DataKinds #-}
{-# LANGUAGE DeriveAnyClass #-}
{-# LANGUAGE DeriveGeneric #-}
{-# LANGUAGE FlexibleContexts #-}
{-# LANGUAGE NoImplicitPrelude #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE ScopedTypeVariables #-}
{-# LANGUAGE TemplateHaskell #-}
{-# LANGUAGE TypeApplications #-}
{-# LANGUAGE TypeFamilies #-}
{-# LANGUAGE TypeOperators #-}
module Week05.NFT where
import Control.Monad hiding (fmap)
import qualified Data.Map as Map
import Data.Text (Text)
import Data.Void (Void)
import Plutus.Contract as Contract
import Plutus.Trace.Emulator as Emulator
import qualified PlutusTx
import PlutusTx.Prelude hiding (Semigroup(..), unless)
import Ledger hiding (mint, singleton)
import Ledger.Constraints as Constraints
import qualified Ledger.Typed.Scripts as Scripts
import Ledger.Value as Value
import Playground.Contract (printJson, printSchemas, ensureKnownCurrencies, stage, ToSchema)
import Playground.TH (mkKnownCurrencies, mkSchemaDefinitions)
import Playground.Types (KnownCurrency (..))
import Prelude (IO, Semigroup (..), Show (..), String)
import Text.Printf (printf)
import Wallet.Emulator.Wallet
{-# INLINABLE mkPolicy #-}
mkPolicy :: TxOutRef -> TokenName -> () -> ScriptContext -> Bool
mkPolicy oref tn () ctx = traceIfFalse "UTxO not consumed" hasUTxO &&
traceIfFalse "wrong amount minted" checkMintedAmount
where
info :: TxInfo
info = scriptContextTxInfo ctx
hasUTxO :: Bool
hasUTxO = any (\i -> txInInfoOutRef i == oref) $ txInfoInputs info
checkMintedAmount :: Bool
checkMintedAmount = case flattenValue (txInfoForge info) of
[(cs, tn', amt)] -> cs == ownCurrencySymbol ctx && tn' == tn && amt == 1
_ -> False
policy :: TxOutRef -> TokenName -> Scripts.MintingPolicy
policy oref tn = mkMintingPolicyScript $
$$(PlutusTx.compile [|| \oref' tn' -> Scripts.wrapMintingPolicy $ mkPolicy oref' tn' ||])
`PlutusTx.applyCode`
PlutusTx.liftCode oref
`PlutusTx.applyCode`
PlutusTx.liftCode tn
curSymbol :: TxOutRef -> TokenName -> CurrencySymbol
curSymbol oref tn = scriptCurrencySymbol $ policy oref tn
type NFTSchema = Endpoint "mint" TokenName
mint :: TokenName -> Contract w NFTSchema Text ()
mint tn = do
pk <- Contract.ownPubKey
utxos <- utxoAt (pubKeyAddress pk)
case Map.keys utxos of
[] -> Contract.logError @String "no utxo found"
oref : _ -> do
let val = Value.singleton (curSymbol oref tn) tn 1
lookups = Constraints.mintingPolicy (policy oref tn) <> Constraints.unspentOutputs utxos
tx = Constraints.mustMintValue val <> Constraints.mustSpendPubKeyOutput oref
ledgerTx <- submitTxConstraintsWith @Void lookups tx
void $ awaitTxConfirmed $ txId ledgerTx
Contract.logInfo @String $ printf "forged %s" (show val)
endpoints :: Contract () NFTSchema Text ()
endpoints = mint' >> endpoints
where
mint' = endpoint @"mint" >>= mint
mkSchemaDefinitions ''NFTSchema
mkKnownCurrencies []
test :: IO ()
test = runEmulatorTraceIO $ do
let tn = "ABC"
h1 <- activateContractWallet (Wallet 1) endpoints
h2 <- activateContractWallet (Wallet 2) endpoints
callEndpoint @"mint" h1 tn
callEndpoint @"mint" h2 tn
void $ Emulator.waitNSlots 1

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{-# LANGUAGE DataKinds #-}
{-# LANGUAGE DeriveAnyClass #-}
{-# LANGUAGE DeriveGeneric #-}
{-# LANGUAGE FlexibleContexts #-}
{-# LANGUAGE NoImplicitPrelude #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE ScopedTypeVariables #-}
{-# LANGUAGE TemplateHaskell #-}
{-# LANGUAGE TypeApplications #-}
{-# LANGUAGE TypeFamilies #-}
{-# LANGUAGE TypeOperators #-}
module Week05.Signed where
import Control.Monad hiding (fmap)
import Data.Aeson (ToJSON, FromJSON)
import Data.Text (Text)
import Data.Void (Void)
import GHC.Generics (Generic)
import Plutus.Contract as Contract
import Plutus.Trace.Emulator as Emulator
import qualified PlutusTx
import PlutusTx.Prelude hiding (Semigroup(..), unless)
import Ledger hiding (mint, singleton)
import Ledger.Constraints as Constraints
import qualified Ledger.Typed.Scripts as Scripts
import Ledger.Value as Value
import Playground.Contract (printJson, printSchemas, ensureKnownCurrencies, stage, ToSchema)
import Playground.TH (mkKnownCurrencies, mkSchemaDefinitions)
import Playground.Types (KnownCurrency (..))
import Prelude (IO, Show (..), String)
import Text.Printf (printf)
import Wallet.Emulator.Wallet
{-# INLINABLE mkPolicy #-}
mkPolicy :: PubKeyHash -> () -> ScriptContext -> Bool
mkPolicy pkh () ctx = txSignedBy (scriptContextTxInfo ctx) pkh
policy :: PubKeyHash -> Scripts.MintingPolicy
policy pkh = mkMintingPolicyScript $
$$(PlutusTx.compile [|| Scripts.wrapMintingPolicy . mkPolicy ||])
`PlutusTx.applyCode`
(PlutusTx.liftCode pkh)
curSymbol :: PubKeyHash -> CurrencySymbol
curSymbol = scriptCurrencySymbol . policy
data MintParams = MintParams
{ mpTokenName :: !TokenName
, mpAmount :: !Integer
} deriving (Generic, ToJSON, FromJSON, ToSchema)
type SignedSchema = Endpoint "mint" MintParams
mint :: MintParams -> Contract w SignedSchema Text ()
mint mp = do
pkh <- pubKeyHash <$> Contract.ownPubKey
let val = Value.singleton (curSymbol pkh) (mpTokenName mp) (mpAmount mp)
lookups = Constraints.mintingPolicy $ policy pkh
tx = Constraints.mustMintValue val
ledgerTx <- submitTxConstraintsWith @Void lookups tx
void $ awaitTxConfirmed $ txId ledgerTx
Contract.logInfo @String $ printf "forged %s" (show val)
endpoints :: Contract () SignedSchema Text ()
endpoints = mint' >> endpoints
where
mint' = endpoint @"mint" >>= mint
mkSchemaDefinitions ''SignedSchema
mkKnownCurrencies []
test :: IO ()
test = runEmulatorTraceIO $ do
let tn = "ABC"
h1 <- activateContractWallet (Wallet 1) endpoints
h2 <- activateContractWallet (Wallet 2) endpoints
callEndpoint @"mint" h1 $ MintParams
{ mpTokenName = tn
, mpAmount = 555
}
callEndpoint @"mint" h2 $ MintParams
{ mpTokenName = tn
, mpAmount = 444
}
void $ Emulator.waitNSlots 1
callEndpoint @"mint" h1 $ MintParams
{ mpTokenName = tn
, mpAmount = -222
}
void $ Emulator.waitNSlots 1

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{-# LANGUAGE DataKinds #-}
{-# LANGUAGE DeriveAnyClass #-}
{-# LANGUAGE DeriveGeneric #-}
{-# LANGUAGE FlexibleContexts #-}
{-# LANGUAGE NoImplicitPrelude #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE ScopedTypeVariables #-}
{-# LANGUAGE TemplateHaskell #-}
{-# LANGUAGE TypeApplications #-}
{-# LANGUAGE TypeFamilies #-}
{-# LANGUAGE TypeOperators #-}
module Week05.Solution1 where
import Control.Monad hiding (fmap)
import Data.Aeson (ToJSON, FromJSON)
import Data.Default (Default (..))
import Data.Text (Text)
import Data.Void (Void)
import GHC.Generics (Generic)
import Plutus.Contract as Contract
import Plutus.Trace.Emulator as Emulator
import qualified PlutusTx
import PlutusTx.Prelude hiding (Semigroup(..), unless)
import Ledger hiding (mint, singleton)
import Ledger.Constraints as Constraints
import Ledger.TimeSlot
import qualified Ledger.Typed.Scripts as Scripts
import Ledger.Value as Value
import Playground.Contract (printJson, printSchemas, ensureKnownCurrencies, stage, ToSchema)
import Playground.TH (mkKnownCurrencies, mkSchemaDefinitions)
import Playground.Types (KnownCurrency (..))
import Prelude (IO, Semigroup (..), Show (..), String)
import Text.Printf (printf)
import Wallet.Emulator.Wallet
{-# INLINABLE mkPolicy #-}
mkPolicy :: PubKeyHash -> POSIXTime -> () -> ScriptContext -> Bool
mkPolicy pkh deadline () ctx =
traceIfFalse "signature missing" (txSignedBy info pkh) &&
traceIfFalse "deadline missed" (to deadline `contains` txInfoValidRange info)
where
info = scriptContextTxInfo ctx
policy :: PubKeyHash -> POSIXTime -> Scripts.MintingPolicy
policy pkh deadline = mkMintingPolicyScript $
$$(PlutusTx.compile [|| \pkh' deadline' -> Scripts.wrapMintingPolicy $ mkPolicy pkh' deadline' ||])
`PlutusTx.applyCode`
PlutusTx.liftCode pkh
`PlutusTx.applyCode`
PlutusTx.liftCode deadline
curSymbol :: PubKeyHash -> POSIXTime -> CurrencySymbol
curSymbol pkh deadline = scriptCurrencySymbol $ policy pkh deadline
data MintParams = MintParams
{ mpTokenName :: !TokenName
, mpDeadline :: !POSIXTime
, mpAmount :: !Integer
} deriving (Generic, ToJSON, FromJSON, ToSchema)
type SignedSchema = Endpoint "mint" MintParams
mint :: MintParams -> Contract w SignedSchema Text ()
mint mp = do
pkh <- pubKeyHash <$> Contract.ownPubKey
now <- Contract.currentTime
let deadline = mpDeadline mp
if now > deadline
then Contract.logError @String "deadline passed"
else do
let val = Value.singleton (curSymbol pkh deadline) (mpTokenName mp) (mpAmount mp)
lookups = Constraints.mintingPolicy $ policy pkh deadline
tx = Constraints.mustMintValue val <> Constraints.mustValidateIn (to $ now + 5000)
ledgerTx <- submitTxConstraintsWith @Void lookups tx
void $ awaitTxConfirmed $ txId ledgerTx
Contract.logInfo @String $ printf "forged %s" (show val)
endpoints :: Contract () SignedSchema Text ()
endpoints = mint' >> endpoints
where
mint' = endpoint @"mint" >>= mint
mkSchemaDefinitions ''SignedSchema
mkKnownCurrencies []
test :: IO ()
test = runEmulatorTraceIO $ do
let tn = "ABC"
deadline = slotToBeginPOSIXTime def 10
h <- activateContractWallet (Wallet 1) endpoints
callEndpoint @"mint" h $ MintParams
{ mpTokenName = tn
, mpDeadline = deadline
, mpAmount = 555
}
void $ Emulator.waitNSlots 15
callEndpoint @"mint" h $ MintParams
{ mpTokenName = tn
, mpDeadline = deadline
, mpAmount = 555
}
void $ Emulator.waitNSlots 1

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{-# LANGUAGE DataKinds #-}
{-# LANGUAGE DeriveAnyClass #-}
{-# LANGUAGE DeriveGeneric #-}
{-# LANGUAGE FlexibleContexts #-}
{-# LANGUAGE NoImplicitPrelude #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE ScopedTypeVariables #-}
{-# LANGUAGE TemplateHaskell #-}
{-# LANGUAGE TypeApplications #-}
{-# LANGUAGE TypeFamilies #-}
{-# LANGUAGE TypeOperators #-}
module Week05.Solution2 where
import Control.Monad hiding (fmap)
import qualified Data.Map as Map
import Data.Text (Text)
import Data.Void (Void)
import Plutus.Contract as Contract
import Plutus.Trace.Emulator as Emulator
import qualified PlutusTx
import PlutusTx.Prelude hiding (Semigroup(..), unless)
import Ledger hiding (mint, singleton)
import Ledger.Constraints as Constraints
import qualified Ledger.Typed.Scripts as Scripts
import Ledger.Value as Value
import Playground.Contract (printJson, printSchemas, ensureKnownCurrencies, stage, ToSchema)
import Playground.TH (mkKnownCurrencies, mkSchemaDefinitions)
import Playground.Types (KnownCurrency (..))
import Prelude (IO, Semigroup (..), Show (..), String)
import Text.Printf (printf)
import Wallet.Emulator.Wallet
{-# INLINABLE tn #-}
tn :: TokenName
tn = TokenName emptyByteString
{-# INLINABLE mkPolicy #-}
mkPolicy :: TxOutRef -> () -> ScriptContext -> Bool
mkPolicy oref () ctx = traceIfFalse "UTxO not consumed" hasUTxO &&
traceIfFalse "wrong amount minted" checkMintedAmount
where
info :: TxInfo
info = scriptContextTxInfo ctx
hasUTxO :: Bool
hasUTxO = any (\i -> txInInfoOutRef i == oref) $ txInfoInputs info
checkMintedAmount :: Bool
checkMintedAmount = case flattenValue (txInfoForge info) of
[(cs, tn', amt)] -> cs == ownCurrencySymbol ctx && tn' == tn && amt == 1
_ -> False
policy :: TxOutRef -> Scripts.MintingPolicy
policy oref = mkMintingPolicyScript $
$$(PlutusTx.compile [|| Scripts.wrapMintingPolicy . mkPolicy ||])
`PlutusTx.applyCode`
PlutusTx.liftCode oref
curSymbol :: TxOutRef -> CurrencySymbol
curSymbol = scriptCurrencySymbol . policy
type NFTSchema = Endpoint "mint" ()
mint :: Contract w NFTSchema Text ()
mint = do
pk <- Contract.ownPubKey
utxos <- utxoAt (pubKeyAddress pk)
case Map.keys utxos of
[] -> Contract.logError @String "no utxo found"
oref : _ -> do
let val = Value.singleton (curSymbol oref) tn 1
lookups = Constraints.mintingPolicy (policy oref) <> Constraints.unspentOutputs utxos
tx = Constraints.mustMintValue val <> Constraints.mustSpendPubKeyOutput oref
ledgerTx <- submitTxConstraintsWith @Void lookups tx
void $ awaitTxConfirmed $ txId ledgerTx
Contract.logInfo @String $ printf "forged %s" (show val)
endpoints :: Contract () NFTSchema Text ()
endpoints = mint' >> endpoints
where
mint' = endpoint @"mint" >> mint
mkSchemaDefinitions ''NFTSchema
mkKnownCurrencies []
test :: IO ()
test = runEmulatorTraceIO $ do
h1 <- activateContractWallet (Wallet 1) endpoints
h2 <- activateContractWallet (Wallet 2) endpoints
callEndpoint @"mint" h1 ()
callEndpoint @"mint" h2 ()
void $ Emulator.waitNSlots 1