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add accept sell ord offer + add ulocker to UTXO
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,43 +1,126 @@ | ||
| package bt | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "context" | ||
| "fmt" | ||
|
|
||
| "github.com/libsv/go-bt/v2/bscript" | ||
| "github.com/libsv/go-bt/v2/sighash" | ||
| "github.com/pkg/errors" | ||
| ) | ||
|
|
||
| func MakeOfferToSellOrdinal(ctx context.Context, sellerOutput *Output, | ||
| utxo *UTXO, unlocker Unlocker) (*Tx, error) { | ||
| // MakeSellOfferArgs contains the arguments | ||
| // needed to make an offer to sell an | ||
| // ordinal (PSBT). | ||
| type MakeSellOfferArgs struct { | ||
| SellerReceiveOutput *Output | ||
| OrdinalUTXO *UTXO | ||
| OrdinalUnlocker Unlocker | ||
| } | ||
|
|
||
| // MakeOfferToSellOrdinal creates a PBST (Partially Signed Bitcoin | ||
| // Transaction) that offers a specific ordinal UTXO for sale at a | ||
| // specific price. | ||
| func MakeOfferToSellOrdinal(ctx context.Context, msoa *MakeSellOfferArgs) (*Tx, error) { | ||
| tx := NewTx() | ||
|
|
||
| // add dummy input 0 to balance out tx | ||
| // so that the next indices are equal | ||
| // for the sighash single as well as | ||
| // fo the ordinal theory rules to carry | ||
| // over ordinals from input to output | ||
| err := tx.From("0000000000000000000000000000000000000000000000000000000000000000", 0, "", 0) | ||
| err := tx.FromUTXOs(msoa.OrdinalUTXO) | ||
| if err != nil { | ||
| return nil, ErrDummyInput | ||
| return nil, err | ||
| } | ||
|
|
||
| err = tx.FromUTXOs(utxo) | ||
| tx.AddOutput(msoa.SellerReceiveOutput) | ||
|
|
||
| err = tx.FillInput(ctx, msoa.OrdinalUnlocker, UnlockerParams{ | ||
| InputIdx: 0, | ||
| SigHashFlags: sighash.SingleForkID | sighash.AnyOneCanPay, | ||
| }) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| // add dummy output (to be replaced by buyer/taker) | ||
| tx.AddDummyOutput() | ||
| return tx, nil | ||
| } | ||
|
|
||
| tx.AddOutput(sellerOutput) | ||
| // AcceptSellOfferArgs contains the arguments | ||
| // needed to make an offer to sell an | ||
| // ordinal (PSBT). | ||
| type AcceptSellOfferArgs struct { | ||
| PSTx *Tx | ||
| Utxos []*UTXO | ||
| BuyerReceiveOrdinalScript *bscript.Script | ||
| DummyOutputScript *bscript.Script | ||
| ChangeScript *bscript.Script | ||
| FQ *FeeQuote | ||
| } | ||
|
|
||
| err = tx.FillInput(ctx, unlocker, UnlockerParams{ | ||
| InputIdx: 1, | ||
| SigHashFlags: sighash.SingleForkID | sighash.AnyOneCanPay, | ||
| // AcceptOfferToSellOrdinal accepts a partially signed Bitcoin | ||
| // transaction offer to sell an ordinal. When accepting the offer, | ||
| // you will need to provide at least 3 UTXOs - with the first 2 | ||
| // being dummy utxos that will just pass through, and the rest with | ||
| // the required payment and tx fees. | ||
| func AcceptOfferToSellOrdinal(ctx context.Context, asoa *AcceptSellOfferArgs) (*Tx, error) { | ||
|
|
||
| // TODO: ValidateSellOffer() | ||
| // check if input 1 sat | ||
|
|
||
| if len(asoa.Utxos) < 3 { | ||
| return nil, ErrInsufficientUTXOs | ||
| } | ||
|
|
||
| tx := NewTx() | ||
|
|
||
| // add dummy inputs | ||
| err := tx.FromUTXOs(asoa.Utxos[0], asoa.Utxos[1]) | ||
| if err != nil { | ||
| return nil, fmt.Errorf(`failed to add inputs: %w`, err) | ||
| } | ||
|
|
||
| sellerOrdinalInput := asoa.PSTx.Inputs[0] // TODO: get from psbt | ||
| tx.addInput(sellerOrdinalInput) | ||
|
|
||
| // add payment input(s) | ||
| err = tx.FromUTXOs(asoa.Utxos[2:]...) | ||
| if err != nil { | ||
| return nil, fmt.Errorf(`failed to add inputs: %w`, err) | ||
| } | ||
|
|
||
| // add dummy output to passthrough dummy inputs | ||
| tx.AddOutput(&Output{ | ||
| LockingScript: asoa.DummyOutputScript, | ||
| Satoshis: asoa.Utxos[0].Satoshis + asoa.Utxos[1].Satoshis, | ||
| }) | ||
|
|
||
| // add ordinal receive output | ||
| tx.AddOutput(&Output{ | ||
| LockingScript: asoa.BuyerReceiveOrdinalScript, | ||
| Satoshis: 1, | ||
| }) | ||
|
|
||
| sellerOutput := asoa.PSTx.Outputs[0] // TODO: get from psbt | ||
| tx.AddOutput(sellerOutput) | ||
|
|
||
| err = tx.Change(asoa.ChangeScript, asoa.FQ) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| for i, u := range asoa.Utxos { | ||
| // skip 3rd input (ordinals input) | ||
| j := i | ||
| if i >= 2 { | ||
| j++ | ||
| } | ||
|
|
||
| if !(bytes.Equal(u.TxID, tx.Inputs[j].previousTxID)) { | ||
| return nil, errors.New("input and utxo mismatch") // TODO: move to errors.go | ||
| } | ||
| err = tx.FillInput(context.Background(), *u.Unlocker, UnlockerParams{InputIdx: uint32(j)}) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| } | ||
|
|
||
| return tx, nil | ||
| } |
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