import FungibleToken from 0xf233dcee88fe0abe import NonFungibleToken from 0x1d7e57aa55817448 import DapperUtilityCoin from 0xead892083b3e2c6c import NFTStorefront from 0x4eb8a10cb9f87357 import MetadataViews from 0x1d7e57aa55817448 import RCRDSHPNFT from 0x6c3ff40b90b928ab // This transaction purchases an NFT on a peer-to-peer marketplace (i.e. **not** directly from a dapp). This transaction // will also initialize the buyer's NFT collection on their account if it has not already been initialized. transaction(listingResourceID: UInt64, storefrontAddress: Address, expectedPrice: UFix64) { let paymentVault: @FungibleToken.Vault let nftCollection: &RCRDSHPNFT.Collection{NonFungibleToken.Receiver} let storefront: &NFTStorefront.Storefront{NFTStorefront.StorefrontPublic} let listing: &NFTStorefront.Listing{NFTStorefront.ListingPublic} let salePrice: UFix64 let balanceBeforeTransfer: UFix64 let mainDapperUtilityCoinVault: &DapperUtilityCoin.Vault prepare(dapper: AuthAccount, buyer: AuthAccount) { // Initialize the buyer's collection if they do not already have one if buyer.borrow<&RCRDSHPNFT.Collection{NonFungibleToken.Receiver}>(from: RCRDSHPNFT.collectionStoragePath) == nil { let collection <- RCRDSHPNFT.createEmptyCollection() as! @RCRDSHPNFT.Collection buyer.save(<-collection, to: RCRDSHPNFT.collectionStoragePath) buyer.link<&RCRDSHPNFT.Collection{NonFungibleToken.CollectionPublic, RCRDSHPNFT.RCRDSHPNFTCollectionPublic, MetadataViews.ResolverCollection}>( RCRDSHPNFT.collectionPublicPath, target: RCRDSHPNFT.collectionStoragePath, ) } // Get the storefront reference from the seller self.storefront = getAccount(storefrontAddress) .getCapability<&NFTStorefront.Storefront{NFTStorefront.StorefrontPublic}>( NFTStorefront.StorefrontPublicPath )! .borrow() ?? panic("Could not borrow Storefront from provided address") // Get the listing by ID from the storefront self.listing = self.storefront.borrowListing(listingResourceID: listingResourceID) ?? panic("No Offer with that ID in Storefront") self.salePrice = self.listing.getDetails().salePrice // Get a DUC vault from Dapper's account self.mainDapperUtilityCoinVault = dapper.borrow<&DapperUtilityCoin.Vault>(from: /storage/dapperUtilityCoinVault) ?? panic("Cannot borrow DapperUtilityCoin vault from account storage") self.balanceBeforeTransfer = self.mainDapperUtilityCoinVault.balance self.paymentVault <- self.mainDapperUtilityCoinVault.withdraw(amount: self.salePrice) // Get the collection from the buyer so the NFT can be deposited into it self.nftCollection = buyer.borrow<&RCRDSHPNFT.Collection{NonFungibleToken.Receiver}>( from: RCRDSHPNFT.collectionStoragePath ) ?? panic("Cannot borrow NFT collection receiver from account") } // Check that the price is right pre { self.salePrice == expectedPrice: "unexpected price" } execute { let item <- self.listing.purchase( payment: <-self.paymentVault ) self.nftCollection.deposit(token: <-item) // Remove listing-related information from the storefront since the listing has been purchased. self.storefront.cleanup(listingResourceID: listingResourceID) } // Check that all dapperUtilityCoin was routed back to Dapper post { self.mainDapperUtilityCoinVault.balance == self.balanceBeforeTransfer: "DapperUtilityCoin leakage" } }

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