import CapsuleNFT from 0xecb0408a4ab2329d pub contract EventTickets: CapsuleNFT { pub var totalMinted: UInt64 pub event ContractInitialized() pub event CollectionCreated() pub event CollectionDestroyed(length: Int) pub event Withdraw(id: String, size: UInt64, from: Address?) pub event Deposit(id: String, size: UInt64, to: Address?) pub event Minted(id: String) pub event TicketMinted( id: String, ticketId: UInt64, ticketCategory: String, eventName: String, retailPrice: UFix64, mintedTime: String, rarity: String, edition: String, mediaUri: String, resourceId: UInt64 ) pub event TicketDestroyed(id: String) pub let CollectionStoragePath: StoragePath pub let CollectionPublicPath: PublicPath pub let MinterStoragePath: StoragePath /// NFT: /// An EventTicket as an NFT pub resource NFT: CapsuleNFT.INFT { pub let id: String pub let ticketId: UInt64 pub let ticketCategory: String pub let eventName: String pub let retailPrice: UFix64 pub let mintedTime: String pub let rarity: String pub let edition: String pub let mediaUri: String init( id: String, ticketId: UInt64, ticketCategory: String, eventName: String, retailPrice: UFix64, mintedTime: String, rarity: String, edition: String, mediaUri: String, ) { self.id = id self.ticketId = ticketId self.ticketCategory = ticketCategory self.eventName = eventName self.retailPrice = retailPrice self.mintedTime = mintedTime self.rarity = rarity self.edition = edition self.mediaUri = mediaUri } destroy() { emit TicketDestroyed(id: self.id) } } /// EventTicketsCollectionPublic: /// This is the interface that users can cast their EventTicket Collection as, /// in order to allow others to deposit an EventTicket into their Collection. /// It also allows for reading the details of an EventTicket in the Collection. pub resource interface EventTicketsCollectionPublic { pub fun deposit(token: @CapsuleNFT.NFT) pub fun getIDs(): [String] pub fun borrowNFT(id: String): &CapsuleNFT.NFT pub fun borrowTicket(id: String): &EventTickets.NFT? { post { (result == nil) || (result?.id == id): "Cannot borrow EventTicket reference: the ID of the returned reference is incorrect" } } } /// Collection: /// A collection of EventTicket NFTs owned by an account pub resource Collection: EventTicketsCollectionPublic, CapsuleNFT.Provider, CapsuleNFT.Receiver, CapsuleNFT.CollectionPublic { // dictionary of NFT conforming tokens // NFT is a resource type with a `String` ID field pub var ownedNFTs: @{String: CapsuleNFT.NFT} init () { self.ownedNFTs <- {} } /// Removes an NFT from the collection and moves it to the caller pub fun withdraw(id: String): @CapsuleNFT.NFT { let address: Address? = self.owner?.address let account: PublicAccount = getAccount(address!) let startUsed: UInt64 = account.storageUsed let token: @CapsuleNFT.NFT <- self.ownedNFTs.remove(key: id) ?? panic("Missing EventTicket NFT!") let endUsed: UInt64 = account.storageUsed let delta: UInt64 = startUsed - endUsed emit Withdraw(id: token.id, size: delta, from: address) return <-token } /// Takes an NFT, adds it to the Collections dictionary, and adds the ID to the id array pub fun deposit(token: @CapsuleNFT.NFT) { let address: Address? = self.owner?.address let account: PublicAccount = getAccount(address!) let startUsed: UInt64 = account.storageUsed let token: @EventTickets.NFT <- token as! @EventTickets.NFT let id: String = token.id // Add the new token to the dictionary which removes the old one let oldToken: @CapsuleNFT.NFT? <- self.ownedNFTs[id] <- token let endUsed: UInt64 = account.storageUsed let delta: UInt64 = endUsed - startUsed emit Deposit(id: id, size: delta, to: address) destroy oldToken } /// Returns an array of the IDs that are in the collection pub fun getIDs(): [String] { return self.ownedNFTs.keys } /// Gets a reference to an NFT in the Collection so that the caller can read its metadata and call its methods pub fun borrowNFT(id: String): &CapsuleNFT.NFT { return (&self.ownedNFTs[id] as &CapsuleNFT.NFT?)! } // Safe way to borrow a reference to an NFT that does not panic // Also now part of the CapsuleNFT.PublicCollection interface // // Parameters: id: The ID of the NFT to get the reference for // // Returns: An optional reference to the desired NFT, will be nil if the passed ID does not exist pub fun borrowNFTSafe(id: String): &CapsuleNFT.NFT? { if let nftRef = &self.ownedNFTs[id] as &CapsuleNFT.NFT? { return nftRef } return nil } pub fun borrowTicket(id: String): &EventTickets.NFT? { if self.ownedNFTs[id] != nil { // Create an authorised reference to allow downcasting let ref = (&self.ownedNFTs[id] as auth &CapsuleNFT.NFT?)! return ref as! &EventTickets.NFT } else { return nil } } // If a transaction destroys the Collection resource, // All the NFTs contained within are also destroyed. // destroy() { let collectionLength = self.ownedNFTs.length destroy self.ownedNFTs emit CollectionDestroyed(length: collectionLength) } } /// Public function that anyone can call to create a new empty collection pub fun createEmptyCollection(): @CapsuleNFT.Collection { emit CollectionCreated() return <- create Collection() } /// Minter: /// Resource that an Admin (or similar) would own to be able to mint new EventTicket NFTs. pub resource NFTMinter { /// Mints a new EventTicket NFT with a new ID and deposits it in the recipients Collection. pub fun mintTicket( recipient: &{CapsuleNFT.CollectionPublic}, id: String, ticketId: UInt64, ticketCategory: String, eventName: String, retailPrice: UFix64, mintedTime: String, rarity: String, edition: String, mediaUri: String, ) { // Create a new EventTicket var ticket: @EventTickets.NFT <- create NFT( id: id, ticketId: ticketId, ticketCategory: ticketCategory, eventName: eventName, retailPrice: retailPrice, mintedTime: mintedTime, rarity: rarity, edition: edition, mediaUri: mediaUri, ) // Emit Events // emit Minted(id: id) emit TicketMinted( id: id, ticketId: ticketId, ticketCategory: ticketCategory, eventName: eventName, retailPrice: retailPrice, mintedTime: mintedTime, rarity: rarity, edition: edition, mediaUri: mediaUri, resourceId: ticket.uuid ) // Increment the total of minted EventTickets EventTickets.totalMinted = EventTickets.totalMinted + 1 // Deposit it in the recipient's account using their reference recipient.deposit(token: <-ticket) } } init() { // Initialize the total minted number of EventTickets self.totalMinted = 0 // Set the named paths self.CollectionStoragePath = /storage/CapsuleTicketsCollection self.CollectionPublicPath = /public/CapsuleTicketsCollection self.MinterStoragePath = /storage/CapsuleTicketsMinter // Create a Collection resource and save it to storage let collection: @EventTickets.Collection <- create Collection() self.account.save(<-collection, to: self.CollectionStoragePath) // Create a public capability for the Collection self.account.link<&EventTickets.Collection{CapsuleNFT.CollectionPublic, EventTickets.EventTicketsCollectionPublic}> (self.CollectionPublicPath, target: self.CollectionStoragePath) // Create a Minter resource and save it to storage let minter: @EventTickets.NFTMinter <- create NFTMinter() self.account.save(<-minter, to: self.MinterStoragePath) emit ContractInitialized() } }