burn.gno

 1package gnogle_nftmarket
 2
 3import (
 4	"chain"
 5	"strconv"
 6
 7	"gno.land/p/g18wk4a80cr7dqa25vfka2yug5n3pd50udled6y3/grc721"
 8)
 9
10// Burn permanently destroys a token the caller owns. The token must be held
11// directly by the caller (not escrowed in a listing or auction).
12func Burn(cur realm, collID, tokenID string) {
13	assertUserCall(cur)
14	coll := mustGetCollection(collID)
15	caller := cur.Previous().Address()
16	tid := grc721.TokenID(tokenID)
17
18	owner, err := coll.nft.OwnerOf(tid)
19	if err != nil {
20		panic(err)
21	}
22	if owner != caller {
23		panic("only the token owner can burn it")
24	}
25	if err := coll.nft.Burn(tid); err != nil {
26		panic(err)
27	}
28	coll.burned++
29
30	chain.Emit("Burn", "collection", collID, "tokenId", tokenID, "by", caller.String())
31}
32
33// SealCollection caps a collection at its current minted count, permanently
34// "burning" the unminted remainder so no further tokens can be minted.
35// Creator-only and irreversible — useful when you created a large supply but
36// minted only part of it.
37func SealCollection(cur realm, collID string) {
38	assertUserCall(cur)
39	coll := mustGetCollection(collID)
40	if cur.Previous().Address() != coll.creator {
41		panic("only the collection creator can seal it")
42	}
43	coll.maxSupply = coll.minted
44	coll.sealed = true
45
46	chain.Emit("CollectionSealed", "collection", collID, "supply", strconv.FormatInt(coll.minted, 10))
47}