import NonFungibleToken from 0x1d7e57aa55817448 import MetadataViews from 0x1d7e57aa55817448 pub contract Hexi_Coll_1517 : NonFungibleToken { pub var totalSupply: UInt64 pub let CollectionStoragePath: StoragePath pub let CollectionPublicPath: PublicPath pub let MinterStoragePath: StoragePath pub let MinterPublicPath: PublicPath //pub var CollectionPrivatePath: PrivatePath pub event ContractInitialized() pub event Withdraw(id: UInt64, from: Address?) pub event Deposit(id: UInt64, to: Address?) pub event Mint(id: UInt64, creator: Address, metadata: {String:String}) pub event Destroy(id: UInt64) // We use dict to store raw metadata pub resource interface RawMetadata { pub fun getRawMetadata(): {String: String} } pub resource NFT: NonFungibleToken.INFT, MetadataViews.Resolver, RawMetadata { pub let id: UInt64 pub let creator: Address access(self) let metadata: {String:String} init( id: UInt64, creator: Address, metadata: {String: String} ) { self.id = id self.creator = creator self.metadata = metadata } pub fun getViews(): [Type] { return [ Type() ] } pub fun resolveView(_ view: Type): AnyStruct? { switch view { case Type(): return MetadataViews.Display( name: self.metadata["name"]!, description: self.metadata["description"]!, thumbnail: MetadataViews.HTTPFile( url: self.metadata["thumbnail"]! ) ) } return nil } pub fun getRawMetadata(): {String: String} { return self.metadata } destroy() { emit Destroy(id: self.id) } } pub resource interface Hexi_Coll_1517CollectionPublic { pub fun deposit(token: @NonFungibleToken.NFT) pub fun getIDs(): [UInt64] pub fun borrowNFT(id: UInt64): &NonFungibleToken.NFT pub fun borrowHexi_Coll_1517(id: UInt64): &Hexi_Coll_1517.NFT? { post { (result == nil) || (result?.id == id): "Cannot borrow NFT reference: the ID of the returned reference is incorrect" } } } pub resource Collection: Hexi_Coll_1517CollectionPublic, NonFungibleToken.Provider, NonFungibleToken.Receiver, NonFungibleToken.CollectionPublic, MetadataViews.ResolverCollection { pub var ownedNFTs: @{UInt64: NonFungibleToken.NFT} init () { self.ownedNFTs <- {} } // withdraw removes an NFT from the collection and moves it to the caller pub fun withdraw(withdrawID: UInt64): @NonFungibleToken.NFT { let token <- self.ownedNFTs.remove(key: withdrawID) ?? panic("missing NFT") emit Withdraw(id: token.id, from: self.owner?.address) return <-token } // deposit takes a NFT and adds it to the collections dictionary // and adds the ID to the id array pub fun deposit(token: @NonFungibleToken.NFT) { let token <- token as! @Hexi_Coll_1517.NFT let id: UInt64 = token.id // add the new token to the dictionary which removes the old one let oldToken <- self.ownedNFTs[id] <- token emit Deposit(id: id, to: self.owner?.address) destroy oldToken } // getIDs returns an array of the IDs that are in the collection pub fun getIDs(): [UInt64] { return self.ownedNFTs.keys } // borrowNFT 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: UInt64): &NonFungibleToken.NFT { return (&self.ownedNFTs[id] as &NonFungibleToken.NFT?)! } pub fun borrowHexi_Coll_1517(id: UInt64): &Hexi_Coll_1517.NFT? { if self.ownedNFTs[id] != nil { // Create an authorized reference to allow downcasting let ref = &self.ownedNFTs[id] as auth &NonFungibleToken.NFT? return ref as! &Hexi_Coll_1517.NFT? } return nil } pub fun borrowViewResolver(id: UInt64): &AnyResource{MetadataViews.Resolver} { let nft = (&self.ownedNFTs[id] as auth &NonFungibleToken.NFT?)! let mlNFT = nft as! &Hexi_Coll_1517.NFT return mlNFT } destroy() { destroy self.ownedNFTs } } // public function that anyone can call to create a new empty collection pub fun createEmptyCollection(): @NonFungibleToken.Collection { return <- create Collection() } // Resource that an admin or something similar would own to be // able to mint new NFTs // pub resource NFTMinter { // mintNFT mints a new NFT with a new ID // and deposit it in the recipients collection using their collection reference pub fun mintNFT( recipient: &{NonFungibleToken.CollectionPublic}, metadata: {String: String} ): &NonFungibleToken.NFT { let creator = self.owner!.address // create a new NFT var newNFT <- create NFT( id: Hexi_Coll_1517.totalSupply, creator: creator, metadata: metadata ) let tokenRef = &newNFT as &NonFungibleToken.NFT // deposit it in the recipient's account using their reference recipient.deposit(token: <-newNFT) Hexi_Coll_1517.totalSupply = Hexi_Coll_1517.totalSupply + 1 emit Mint(id: tokenRef.id, creator: creator, metadata: metadata) return tokenRef } } init() { // Initialize the total supply self.totalSupply = 0 // Set the named paths self.CollectionStoragePath = /storage/MatrixMarketHexi_Coll_1517Collection self.CollectionPublicPath = /public/MatrixMarketHexi_Coll_1517Collection self.MinterStoragePath = /storage/MatrixMarketHexi_Coll_1517Minter self.MinterPublicPath = /public/MatrixMarketHexi_Coll_1517Minter // Create a Collection resource and save it to storage let collection <- create Collection() self.account.save(<-collection, to: self.CollectionStoragePath) // create a public capability for the collection self.account.link<&Hexi_Coll_1517.Collection{NonFungibleToken.Receiver, NonFungibleToken.CollectionPublic, Hexi_Coll_1517.Hexi_Coll_1517CollectionPublic, MetadataViews.ResolverCollection}>( self.CollectionPublicPath, target: self.CollectionStoragePath ) // Create a Minter resource and save it to storage let minter <- create NFTMinter() self.account.save(<-minter, to: self.MinterStoragePath) emit ContractInitialized() } }