gno.land/r/gnoland/wugnot⧉

1package wugnot23import (4	"chain"5	"chain/banker"6	"chain/runtime"7	"chain/runtime/unsafe"8	"strings"910	"gno.land/p/nt/grc20/v0"11	"gno.land/p/nt/ufmt/v0"12	"gno.land/r/nt/grc20reg/v0"13)1415var (16	Token *grc20.Token17	adm   *grc20.PrivateLedger18)1920const (21	ugnotMinDeposit  int64 = 100022	wugnotMinDeposit int64 = 123)2425func init(cur realm) {26	// wugnot only ever creates this one token, so id 0 can't collide.27	Token, adm = grc20.NewToken("wrapped GNOT", "wugnot", 0, 0, cur)28	grc20reg.Register(cross(cur), Token, "")29}3031func Deposit(cur realm) {32	// Prevent cross-realm MITM: without this, an intermediary could33	// deposit on behalf of the caller and mint wugnot to itself34	// instead of the actual sender.35	runtime.AssertOriginCall()36	caller := cur.Previous().Address()37	sent := unsafe.OriginSend()38	amount := sent.AmountOf("ugnot")3940	require(int64(amount) >= ugnotMinDeposit, ufmt.Sprintf("Deposit below minimum: %d/%d ugnot.", amount, ugnotMinDeposit))4142	checkErr(adm.Mint(caller, int64(amount)))43}4445func Withdraw(cur realm, amount int64) {46	runtime.AssertOriginCall()47	require(amount >= wugnotMinDeposit, ufmt.Sprintf("Deposit below minimum: %d/%d wugnot.", amount, wugnotMinDeposit))4849	caller := cur.Previous().Address()50	pkgaddr := cur.Address()51	callerBal := Token.BalanceOf(caller)52	require(amount <= callerBal, ufmt.Sprintf("Insufficient balance: %d available, %d needed.", callerBal, amount))5354	// send swapped ugnots to qcaller55	stdBanker := banker.NewBanker(banker.BankerTypeRealmSend, cur)56	send := chain.Coins{{"ugnot", int64(amount)}}57	stdBanker.SendCoins(pkgaddr, caller, send)58	checkErr(adm.Burn(caller, amount))59}6061func Render(path string) string {62	parts := strings.Split(path, "/")63	c := len(parts)6465	switch {66	case path == "":67		return Token.RenderHome()68	case c == 2 && parts[0] == "balance":69		owner := address(parts[1])70		balance := Token.BalanceOf(owner)71		return ufmt.Sprintf("%d", balance)72	default:73		return "404"74	}75}7677func TotalSupply() int64 {78	return Token.TotalSupply()79}8081func BalanceOf(owner address) int64 {82	return Token.BalanceOf(owner)83}8485func Allowance(owner, spender address) int64 {86	return Token.Allowance(owner, spender)87}8889func Transfer(cur realm, to address, amount int64) {90	userTeller := adm.CallerTeller()91	checkErr(userTeller.Transfer(0, cur, to, amount))92}9394func Approve(cur realm, spender address, amount int64) {95	userTeller := adm.CallerTeller()96	checkErr(userTeller.Approve(0, cur, spender, amount))97}9899func TransferFrom(cur realm, from, to address, amount int64) {100	userTeller := adm.CallerTeller()101	checkErr(userTeller.TransferFrom(0, cur, from, to, amount))102}103104func require(condition bool, msg string) {105	if !condition {106		panic(msg)107	}108}109110func checkErr(err error) {111	if err != nil {112		panic(err)113	}114}115