import FungibleToken from 0xf233dcee88fe0abe import NonFungibleToken from 0x1d7e57aa55817448 import DapperUtilityCoin from 0xead892083b3e2c6c import UFC_NFT from 0x329feb3ab062d289 transaction(sellerAddress: Address, nftIDs: [UInt64], price: UFix64, metadata: {String: String}) { let gigAuthAccountAddress: Address let paymentVault: @FungibleToken.Vault let sellerPaymentReceiver: &{FungibleToken.Receiver} let gigNFTCollectionRef: @NonFungibleToken.Collection let buyerNFTCollection: &AnyResource{UFC_NFT.UFC_NFTCollectionPublic} let balanceBeforeTransfer: UFix64 let mainDucVault: &DapperUtilityCoin.Vault prepare(gig: AuthAccount, dapper: AuthAccount, buyer: AuthAccount) { self.gigAuthAccountAddress = gig.address // If the account doesn't already have a collection if buyer.borrow<&UFC_NFT.Collection>(from: UFC_NFT.CollectionStoragePath) == nil { // Create a new empty collection and save it to the account buyer.save(<-UFC_NFT.createEmptyCollection(), to: UFC_NFT.CollectionStoragePath) // Create a public capability to the UFC_NFT collection // that exposes the Collection interface buyer.link<&UFC_NFT.Collection{NonFungibleToken.CollectionPublic,UFC_NFT.UFC_NFTCollectionPublic}>( UFC_NFT.CollectionPublicPath, target: UFC_NFT.CollectionStoragePath ) } // withdraw NFT let gigNftProvider = gig.borrow<&UFC_NFT.Collection>(from: UFC_NFT.CollectionStoragePath) ?? panic("Could not borrow NFT Provider") self.gigNFTCollectionRef <- gigNftProvider.batchWithdraw(ids: nftIDs) // withdraw DUC self.mainDucVault = dapper.borrow<&DapperUtilityCoin.Vault>(from: /storage/dapperUtilityCoinVault) ?? panic("Could not borrow reference to Dapper Utility Coin vault") self.balanceBeforeTransfer = self.mainDucVault.balance self.paymentVault <- self.mainDucVault.withdraw(amount: price) // set seller DUC receiver ref self.sellerPaymentReceiver = getAccount(sellerAddress).getCapability(/public/dapperUtilityCoinReceiver) .borrow<&{FungibleToken.Receiver}>() ?? panic("Could not borrow receiver reference to the recipient's Vault") // set buyer NFT receiver ref self.buyerNFTCollection = buyer .getCapability(UFC_NFT.CollectionPublicPath)! .borrow<&{UFC_NFT.UFC_NFTCollectionPublic}>()! } pre { // Make sure the seller is the right account self.gigAuthAccountAddress == 0x329feb3ab062d289 && sellerAddress == 0xcfa0d15914188d1d: "seller must be GigLabs" } execute { self.sellerPaymentReceiver.deposit(from: <- self.paymentVault) self.buyerNFTCollection.batchDeposit(tokens: <-self.gigNFTCollectionRef) } post { // Ensure there is no DUC leakage self.mainDucVault.balance == self.balanceBeforeTransfer: "transaction would leak DUC" } }

Transaction

This transaction was not submitted because it was sent to the blockchain with a key that already has a pending transaction.