import NonFungibleToken from 0x1d7e57aa55817448 import MetadataViews from 0x1d7e57aa55817448 import KARATZL7LXANFT from 0x82ed1b9cba5bb1b3 import FungibleToken from 0xf233dcee88fe0abe import Karatv2 from 0x82ed1b9cba5bb1b3 pub fun hasKaratv2(_ address: Address): Bool { let receiver = getAccount(address) .getCapability<&Karatv2.Vault{FungibleToken.Receiver}>(Karatv2.ReceiverPublicPath) .check() let balance = getAccount(address) .getCapability<&Karatv2.Vault{FungibleToken.Balance}>(Karatv2.BalancePublicPath) .check() return receiver && balance } transaction(amount: UFix64, name: String, artist: String, artistAddress: Address, description: String, royalty: UFix64, typeID: String) { // Local variables to hold references for use in execute phase let buyerVaultRef: &Karatv2.Vault? let sellerReceiverRef: &{FungibleToken.Receiver}? let nftMinter: &KARATZL7LXANFT.NFTMinter let buyerNftReceiver: &{NonFungibleToken.CollectionPublic} prepare(minter: AuthAccount, seller: AuthAccount, buyer: AuthAccount) { if amount > UFix64(0) { // Enable seller token if !hasKaratv2(seller.address) { if seller.borrow<&Karatv2.Vault>(from: Karatv2.VaultStoragePath) == nil { seller.save(<-Karatv2.createEmptyVault(), to: Karatv2.VaultStoragePath) } seller.unlink(Karatv2.ReceiverPublicPath) seller.unlink(Karatv2.BalancePublicPath) seller.link<&Karatv2.Vault{FungibleToken.Receiver}>(Karatv2.ReceiverPublicPath, target: Karatv2.VaultStoragePath) seller.link<&Karatv2.Vault{FungibleToken.Balance}>(Karatv2.BalancePublicPath, target: Karatv2.VaultStoragePath) } // References for transferring tokens self.buyerVaultRef = buyer.borrow<&Karatv2.Vault>(from: Karatv2.VaultStoragePath) assert(self.buyerVaultRef != nil, message: "Could not borrow reference to the buyer's Vault!") self.sellerReceiverRef = getAccount(seller.address).getCapability(Karatv2.ReceiverPublicPath)! .borrow<&{FungibleToken.Receiver}>() assert(self.sellerReceiverRef != nil, message: "Could not borrow receiver reference to the seller's Vault") } else { self.buyerVaultRef = nil self.sellerReceiverRef = nil } // Enable buyer collection let d = KARATZL7LXANFT.resolveView(Type())! as! MetadataViews.NFTCollectionData if buyer.borrow<&KARATZL7LXANFT.Collection>(from: d.storagePath) == nil { buyer.save(<- KARATZL7LXANFT.createEmptyCollection(), to: KARATZL7LXANFT.CollectionStoragePath) buyer.unlink(d.publicPath) buyer.link<&KARATZL7LXANFT.Collection{KARATZL7LXANFT.KARATZL7LXANFTCollectionPublic, NonFungibleToken.CollectionPublic}>(d.publicPath, target: d.storagePath) buyer.unlink(d.providerPath) buyer.link<&KARATZL7LXANFT.Collection{KARATZL7LXANFT.KARATZL7LXANFTCollectionPublic, NonFungibleToken.CollectionPublic, NonFungibleToken.Provider}>(d.providerPath, target: d.storagePath) } // References for minting NFT self.nftMinter = minter.borrow<&KARATZL7LXANFT.NFTMinter>(from: KARATZL7LXANFT.AdminStoragePath) ?? panic("Could not borrow a reference to the NFT minter") self.buyerNftReceiver = getAccount(buyer.address).getCapability(KARATZL7LXANFT.CollectionPublicPath)! .borrow<&{NonFungibleToken.CollectionPublic}>() ?? panic("Could not get receiver reference to the NFT Collection") } execute { // Transfer tokens from buyer to seller if amount > UFix64(0) { self.sellerReceiverRef!.deposit(from: <- self.buyerVaultRef!.withdraw(amount: amount)) } // Create metadata for the new NFT let metadata = KARATZL7LXANFT.Metadata( name: name, artist: artist, artistAddress: artistAddress, description: description, type: typeID, serialId: 1, royalty: royalty ) // Mint new NFT for the buyer self.nftMinter.mintNFT(recipient: self.buyerNftReceiver, metadata: metadata) } }

Transaction