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224: decoding payments locally for offchain accounting #242

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224: decoding payments locally for offchain accounting #242

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224: decoding payments locally for offchain accounting
murraystewart96 May 17, 2026
6449140
224: decoding all payment request fields
murraystewart96 May 17, 2026
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36 changes: 35 additions & 1 deletion accounting/config.go
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Original file line number Diff line number Diff line change
Expand Up @@ -5,12 +5,15 @@ import (
"time"

"github.com/btcsuite/btcd/btcutil"
"github.com/btcsuite/btcd/chaincfg"
"github.com/btcsuite/btcd/chaincfg/chainhash"
"github.com/lightninglabs/faraday/fees"
"github.com/lightninglabs/faraday/fiat"
"github.com/lightninglabs/faraday/lndwrap"
"github.com/lightninglabs/lndclient"
"github.com/lightningnetwork/lnd/lnwire"
"github.com/lightningnetwork/lnd/routing/route"
"github.com/lightningnetwork/lnd/zpay32"
)

// decodePaymentRequest is a signature for decoding payment requests.
Expand Down Expand Up @@ -194,7 +197,7 @@ func NewOffChainConfig(ctx context.Context, lnd lndclient.LndServices,
DecodePayReq: func(payReq string) (*lndclient.PaymentRequest,
error) {

return lnd.Client.DecodePaymentRequest(ctx, payReq)
return decodePaymentReq(payReq, lnd.ChainParams)
},
OwnPubKey: ownPubkey,
CommonConfig: CommonConfig{
Expand All @@ -206,3 +209,34 @@ func NewOffChainConfig(ctx context.Context, lnd lndclient.LndServices,
},
}
}

func decodePaymentReq(payReq string,
chainParams *chaincfg.Params) (*lndclient.PaymentRequest, error) {

invoice, err := zpay32.Decode(payReq, chainParams)
if err != nil {
return nil, err
}

desc := ""
if invoice.Description != nil {
desc = *invoice.Description
}

var amtMsat lnwire.MilliSatoshi
if invoice.MilliSat != nil {
amtMsat = *invoice.MilliSat
}

req := &lndclient.PaymentRequest{
Destination: route.NewVertex(invoice.Destination),
Hash: *invoice.PaymentHash,
Value: amtMsat,
Description: desc,
Timestamp: invoice.Timestamp,
Expiry: invoice.Timestamp.Add(invoice.Expiry()),
PaymentAddress: invoice.PaymentAddr.UnwrapOr([32]byte{}),
}

return req, nil
}