package invoicesrpc import ( "encoding/hex" "errors" "fmt" "github.com/btcsuite/btcd/btcec" "github.com/btcsuite/btcd/chaincfg" "github.com/lightningnetwork/lnd/channeldb" "github.com/lightningnetwork/lnd/lnrpc" "github.com/lightningnetwork/lnd/lnwire" "github.com/lightningnetwork/lnd/zpay32" ) // decodePayReq decodes the invoice payment request if present. This is needed, // because not all information is stored in dedicated invoice fields. If there // is no payment request present, a dummy request will be returned. This can // happen with just-in-time inserted keysend invoices. func decodePayReq(invoice *channeldb.Invoice, activeNetParams *chaincfg.Params) (*zpay32.Invoice, error) { paymentRequest := string(invoice.PaymentRequest) if paymentRequest == "" { preimage := invoice.Terms.PaymentPreimage if preimage == nil { return nil, errors.New("cannot reconstruct pay req") } hash := [32]byte(preimage.Hash()) return &zpay32.Invoice{ PaymentHash: &hash, }, nil } var err error decoded, err := zpay32.Decode(paymentRequest, activeNetParams) if err != nil { return nil, fmt.Errorf("unable to decode payment "+ "request: %v", err) } return decoded, nil } // CreateRPCInvoice creates an *lnrpc.Invoice from the *channeldb.Invoice. func CreateRPCInvoice(invoice *channeldb.Invoice, activeNetParams *chaincfg.Params) (*lnrpc.Invoice, error) { decoded, err := decodePayReq(invoice, activeNetParams) if err != nil { return nil, err } var descHash []byte if decoded.DescriptionHash != nil { descHash = decoded.DescriptionHash[:] } fallbackAddr := "" if decoded.FallbackAddr != nil { fallbackAddr = decoded.FallbackAddr.String() } settleDate := int64(0) if !invoice.SettleDate.IsZero() { settleDate = invoice.SettleDate.Unix() } // Convert between the `lnrpc` and `routing` types. routeHints := CreateRPCRouteHints(decoded.RouteHints) preimage := invoice.Terms.PaymentPreimage satAmt := invoice.Terms.Value.ToSatoshis() satAmtPaid := invoice.AmtPaid.ToSatoshis() isSettled := invoice.State == channeldb.ContractSettled var state lnrpc.Invoice_InvoiceState switch invoice.State { case channeldb.ContractOpen: state = lnrpc.Invoice_OPEN case channeldb.ContractSettled: state = lnrpc.Invoice_SETTLED case channeldb.ContractCanceled: state = lnrpc.Invoice_CANCELED case channeldb.ContractAccepted: state = lnrpc.Invoice_ACCEPTED default: return nil, fmt.Errorf("unknown invoice state %v", invoice.State) } rpcHtlcs := make([]*lnrpc.InvoiceHTLC, 0, len(invoice.Htlcs)) for key, htlc := range invoice.Htlcs { var state lnrpc.InvoiceHTLCState switch htlc.State { case channeldb.HtlcStateAccepted: state = lnrpc.InvoiceHTLCState_ACCEPTED case channeldb.HtlcStateSettled: state = lnrpc.InvoiceHTLCState_SETTLED case channeldb.HtlcStateCanceled: state = lnrpc.InvoiceHTLCState_CANCELED default: return nil, fmt.Errorf("unknown state %v", htlc.State) } rpcHtlc := lnrpc.InvoiceHTLC{ ChanId: key.ChanID.ToUint64(), HtlcIndex: key.HtlcID, AcceptHeight: int32(htlc.AcceptHeight), AcceptTime: htlc.AcceptTime.Unix(), ExpiryHeight: int32(htlc.Expiry), AmtMsat: uint64(htlc.Amt), State: state, CustomRecords: htlc.CustomRecords, MppTotalAmtMsat: uint64(htlc.MppTotalAmt), } // Only report resolved times if htlc is resolved. if htlc.State != channeldb.HtlcStateAccepted { rpcHtlc.ResolveTime = htlc.ResolveTime.Unix() } rpcHtlcs = append(rpcHtlcs, &rpcHtlc) } rpcInvoice := &lnrpc.Invoice{ Memo: string(invoice.Memo[:]), RHash: decoded.PaymentHash[:], Value: int64(satAmt), ValueMsat: int64(invoice.Terms.Value), CreationDate: invoice.CreationDate.Unix(), SettleDate: settleDate, Settled: isSettled, PaymentRequest: string(invoice.PaymentRequest), DescriptionHash: descHash, Expiry: int64(invoice.Terms.Expiry.Seconds()), CltvExpiry: uint64(invoice.Terms.FinalCltvDelta), FallbackAddr: fallbackAddr, RouteHints: routeHints, AddIndex: invoice.AddIndex, Private: len(routeHints) > 0, SettleIndex: invoice.SettleIndex, AmtPaidSat: int64(satAmtPaid), AmtPaidMsat: int64(invoice.AmtPaid), AmtPaid: int64(invoice.AmtPaid), State: state, Htlcs: rpcHtlcs, Features: CreateRPCFeatures(invoice.Terms.Features), IsKeysend: len(invoice.PaymentRequest) == 0, } if preimage != nil { rpcInvoice.RPreimage = preimage[:] } return rpcInvoice, nil } // CreateRPCFeatures maps a feature vector into a list of lnrpc.Features. func CreateRPCFeatures(fv *lnwire.FeatureVector) map[uint32]*lnrpc.Feature { if fv == nil { return nil } features := fv.Features() rpcFeatures := make(map[uint32]*lnrpc.Feature, len(features)) for bit := range features { rpcFeatures[uint32(bit)] = &lnrpc.Feature{ Name: fv.Name(bit), IsRequired: bit.IsRequired(), IsKnown: fv.IsKnown(bit), } } return rpcFeatures } // CreateRPCRouteHints takes in the decoded form of an invoice's route hints // and converts them into the lnrpc type. func CreateRPCRouteHints(routeHints [][]zpay32.HopHint) []*lnrpc.RouteHint { var res []*lnrpc.RouteHint for _, route := range routeHints { hopHints := make([]*lnrpc.HopHint, 0, len(route)) for _, hop := range route { pubKey := hex.EncodeToString( hop.NodeID.SerializeCompressed(), ) hint := &lnrpc.HopHint{ NodeId: pubKey, ChanId: hop.ChannelID, FeeBaseMsat: hop.FeeBaseMSat, FeeProportionalMillionths: hop.FeeProportionalMillionths, CltvExpiryDelta: uint32(hop.CLTVExpiryDelta), } hopHints = append(hopHints, hint) } routeHint := &lnrpc.RouteHint{HopHints: hopHints} res = append(res, routeHint) } return res } // CreateZpay32HopHints takes in the lnrpc form of route hints and converts them // into an invoice decoded form. func CreateZpay32HopHints(routeHints []*lnrpc.RouteHint) ([][]zpay32.HopHint, error) { var res [][]zpay32.HopHint for _, route := range routeHints { hopHints := make([]zpay32.HopHint, 0, len(route.HopHints)) for _, hop := range route.HopHints { pubKeyBytes, err := hex.DecodeString(hop.NodeId) if err != nil { return nil, err } p, err := btcec.ParsePubKey(pubKeyBytes, btcec.S256()) if err != nil { return nil, err } hopHints = append(hopHints, zpay32.HopHint{ NodeID: p, ChannelID: hop.ChanId, FeeBaseMSat: hop.FeeBaseMsat, FeeProportionalMillionths: hop.FeeProportionalMillionths, CLTVExpiryDelta: uint16(hop.CltvExpiryDelta), }) } res = append(res, hopHints) } return res, nil }