gno.land/p/akkadia/beta/grc721⧉

1package grc72123// IGRC721Reader is the read-only view of an NFT. Safe to receive across4// realm boundaries — has no rlm-typed methods, so a malicious impl can5// only lie about read results (data-integrity issue), not capture cur.6//7// Writes are concrete methods on *basicNFT only — there is no IGRC7218// writer interface. The owning realm should9// hold the concrete *basicNFT in an unexported package var and expose10// public rlm-validating wrappers like:11//12//	func TransferFrom(cur realm, from, to address, tid TokenID) error {13//		caller := cur.Previous().Address()14//		return nft.TransferFrom(caller, from, to, tid)15//	}16//17// This is the Reader/Writer split — stronger than the Authority-pattern18// because the writer interface doesn't exist at all, so no realm author19// can accidentally expose it. See `r/demo/foo721` for the canonical20// wrapper pattern.21type IGRC721Reader interface {22	Name() string23	Symbol() string24	TokenCount() int6425	BalanceOf(owner address) (int64, error)26	OwnerOf(tid TokenID) (address, error)27	GetApproved(tid TokenID) (address, error)28	IsApprovedForAll(owner, operator address) bool29}3031type (32	TokenID  string33	TokenURI string34)3536func (t TokenID) String() string  { return string(t) }37func (t TokenURI) String() string { return string(t) }3839const (40	MintEvent           = "Mint"41	BurnEvent           = "Burn"42	TransferEvent       = "Transfer"43	ApprovalEvent       = "Approval"44	ApprovalForAllEvent = "ApprovalForAll"45)4647// NFTGetter returns a reader-only view of an NFT. Aggregators (such as48// tokenhub) register and dispatch NFTGetters; the reader-only return49// type means even a malicious aggregator can't be used to leak cur.50type NFTGetter func() IGRC721Reader51