makeinvoice.go

package main

import (
	"strconv"
	"time"

	"github.com/fiatjaf/makeinvoice"
	"github.com/tidwall/sjson"
)

func makeMetadata(params *UserParams) string {
	metadata, _ := sjson.Set("[]", "0.0", "text/identifier")
	metadata, _ = sjson.Set(metadata, "0.1", params.Name+"@"+params.Domain)

	metadata, _ = sjson.Set(metadata, "1.0", "text/plain")
	metadata, _ = sjson.Set(metadata, "1.1", "Satoshis to "+params.Name+"@"+params.Domain+".")

	return metadata
}

func makeInvoice(
	params *UserParams,
	msat uint64,
	zap string,
	comment string,
) (bolt11 string, err error) {
	// prepare params
	var backend makeinvoice.LNBackendParams
	switch params.Kind {
	case "sparko":
		backend = makeinvoice.SparkoParams{
			Host: params.Host,
			Key:  params.Key,
		}
	case "lnd":
		backend = makeinvoice.LNDParams{
			Host:     params.Host,
			Macaroon: params.Key,
			Private:  true,
		}
	case "lnbits":
		backend = makeinvoice.LNBitsParams{
			Host: params.Host,
			Key:  params.Key,
		}
	case "lnpay":
		backend = makeinvoice.LNPayParams{
			PublicAccessKey:  params.Pak,
			WalletInvoiceKey: params.Waki,
		}
	case "eclair":
		backend = makeinvoice.EclairParams{
			Host:     params.Host,
			Password: "",
		}
	case "commando":
		backend = makeinvoice.CommandoParams{
			Host:   params.Host,
			NodeId: params.NodeId,
			Rune:   params.Rune,
		}
	case "phoenix":
		backend = makeinvoice.PhoenixParams{
			Host:   params.Host,
			Key: params.Key,
		}
	}

	mip := makeinvoice.LNParams{
		Msatoshi: int64(msat),
		Backend:  backend,

		Label: params.Domain + "/" + strconv.FormatInt(time.Now().Unix(), 16),
	}

	// make the lnurlpay description_hash

	if zap != "" {
		mip.UseDescriptionHash = true
		mip.Description = zap
	} else if comment != "" {
		mip.Description = comment
	} else {
		mip.Description = makeMetadata(params)
	}

	// actually generate the invoice
	bolt11, err = makeinvoice.MakeInvoice(mip)

	log.Debug().Uint64("msatoshi", msat).
		Interface("backend", backend).
		Str("bolt11", bolt11).Err(err).
		Msg("invoice generation")

	return bolt11, err
}