| 1 | package abt |
| 2 | |
| 3 | import ( |
| 4 | "chain" |
| 5 | "chain/runtime/unsafe" |
| 6 | "strconv" |
| 7 | |
| 8 | "gno.land/p/akkadia/beta/accesscontrol" |
| 9 | "gno.land/p/nt/grc20/v0" |
| 10 | "gno.land/r/akkadia/beta/admin" |
| 11 | ) |
| 12 | |
| 13 | const FrozenChangedEvent = "FrozenChanged" |
| 14 | |
| 15 | var ( |
| 16 | // Even a Token can create mutable tellers; keep all capabilities private. |
| 17 | token *grc20.Token |
| 18 | ledger *grc20.PrivateLedger |
| 19 | frozen = true |
| 20 | ) |
| 21 | |
| 22 | func init(cur realm) { |
| 23 | token, ledger = grc20.NewToken("Akkadia Beta Token", "abt", 6, 0, cur) |
| 24 | } |
| 25 | |
| 26 | // Mint remains available while frozen. Each successful call issues new tokens. |
| 27 | func Mint(cur realm, to address, amount int64) { |
| 28 | accesscontrol.MustGetAdminOrOperatorCaller(0, cur, admin.IsAdmin, admin.IsOperator) |
| 29 | assertNoCoins(0, cur) |
| 30 | if !to.IsValid() { |
| 31 | panic("invalid abt recipient") |
| 32 | } |
| 33 | if amount <= 0 { |
| 34 | panic("abt amount must be positive") |
| 35 | } |
| 36 | if err := ledger.Mint(to, amount); err != nil { |
| 37 | panic("abt mint failed: " + err.Error()) |
| 38 | } |
| 39 | } |
| 40 | |
| 41 | // SetFrozen preserves existing allowances, which become usable after unfreezing. |
| 42 | func SetFrozen(cur realm, value bool) { |
| 43 | caller := accesscontrol.MustGetAdminCaller(0, cur, admin.IsAdmin) |
| 44 | assertNoCoins(0, cur) |
| 45 | if frozen == value { |
| 46 | return |
| 47 | } |
| 48 | previous := frozen |
| 49 | frozen = value |
| 50 | chain.Emit(FrozenChangedEvent, |
| 51 | "executor", caller.String(), |
| 52 | "previous", strconv.FormatBool(previous), |
| 53 | "frozen", strconv.FormatBool(frozen), |
| 54 | ) |
| 55 | } |
| 56 | |
| 57 | func Transfer(cur realm, to address, amount int64) { |
| 58 | assertCanTransfer(0, cur) |
| 59 | if err := ledger.CallerTeller().Transfer(0, cur, to, amount); err != nil { |
| 60 | panic("abt transfer failed: " + err.Error()) |
| 61 | } |
| 62 | } |
| 63 | |
| 64 | // Approve also rejects allowance revocation while frozen. |
| 65 | func Approve(cur realm, spender address, amount int64) { |
| 66 | assertCanTransfer(0, cur) |
| 67 | if err := ledger.CallerTeller().Approve(0, cur, spender, amount); err != nil { |
| 68 | panic("abt approval failed: " + err.Error()) |
| 69 | } |
| 70 | } |
| 71 | |
| 72 | func TransferFrom(cur realm, from, to address, amount int64) { |
| 73 | assertCanTransfer(0, cur) |
| 74 | // The library spends allowance before rejecting self-transfers. Reject |
| 75 | // here so even a caller that revives the abort cannot consume allowance. |
| 76 | if from == to { |
| 77 | panic("abt transfer failed: cannot send transfer to self") |
| 78 | } |
| 79 | if err := ledger.CallerTeller().TransferFrom(0, cur, from, to, amount); err != nil { |
| 80 | panic("abt transfer failed: " + err.Error()) |
| 81 | } |
| 82 | } |
| 83 | |
| 84 | func IsFrozen() bool { return frozen } |
| 85 | func GetName() string { return token.GetName() } |
| 86 | func GetSymbol() string { return token.GetSymbol() } |
| 87 | func GetDecimals() int { return token.GetDecimals() } |
| 88 | func TotalSupply() int64 { return token.TotalSupply() } |
| 89 | func BalanceOf(owner address) int64 { return token.BalanceOf(owner) } |
| 90 | func Allowance(owner, spender address) int64 { return token.Allowance(owner, spender) } |
| 91 | |
| 92 | func assertCanTransfer(_ int, rlm realm) { |
| 93 | accesscontrol.AssertCurrentRealm(0, rlm) |
| 94 | assertNoCoins(0, rlm) |
| 95 | if frozen { |
| 96 | panic("abt is frozen") |
| 97 | } |
| 98 | } |
| 99 | |
| 100 | func assertNoCoins(_ int, rlm realm) { |
| 101 | // OriginSend belongs to the origin call, not a subsequent realm relay. |
| 102 | if rlm.Previous().IsUser() && len(unsafe.OriginSend()) != 0 { |
| 103 | panic("attached coins not allowed") |
| 104 | } |
| 105 | } |
