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main.go
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main.go
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package main
import (
"bytes"
"encoding/base64"
"encoding/json"
"flag"
"fmt"
"html/template"
baselog "log"
"net/http"
"os"
"strings"
"github.com/MadAppGang/httplog"
"github.com/btcsuite/btclog"
"github.com/btcsuite/btcutil/bech32"
"github.com/lightningnetwork/lnd/lnrpc"
"github.com/lightningnetwork/lnd/macaroons"
"github.com/skip2/go-qrcode"
"google.golang.org/grpc"
"google.golang.org/grpc/credentials"
"gopkg.in/macaroon.v2"
)
type ServerConfig struct {
RPCHost string
InvoiceMacaroonPath string
TLSCertPath string
WorkingDir string
ExternalURL string
ListAllURLs bool
LightningAddresses []string
MinSendableMsat int
MaxSendableMsat int
MaxCommentLength int
Tag string
Metadata [][]string
Thumbnail string
SuccessMessage string
InvoiceCallback string
AddressServerPort int
Nostr *NostrConfig
Notificators []notificatorConfig
}
type LNUrlPay struct {
MinSendable int `json:"minSendable"`
MaxSendable int `json:"maxSendable"`
CommentAllowed int `json:"commentAllowed"`
Tag string `json:"tag"`
Metadata string `json:"metadata"`
Callback string `json:"callback"`
}
type Invoice struct {
Pr string `json:"pr"`
Routes []string `json:"routes"`
SuccessAction *SuccessAction `json:"successAction"`
}
type Error struct {
Status string `json:"status"`
Reason string `json:"reason"`
}
type SuccessAction struct {
Tag string `json:"tag"`
Message string `json:"message,omitempty"`
}
var (
log btclog.Logger
)
type NostrConfig struct {
Names map[string]string `json:"names"`
Relays map[string][]string `json:"relays"`
}
func main() {
c := flag.String(
"config", "./config.json", "Specify the configuration file",
)
flag.Parse()
configBytes, err := os.ReadFile(*c)
if err != nil {
baselog.Fatalf("cannot read config file '%s': %v", *c, err)
}
config := ServerConfig{}
err = json.Unmarshal(configBytes, &config)
if err != nil {
baselog.Fatalf("cannot decode config JSON %v", err)
}
workingDir := config.WorkingDir
log, err = GetLogger(workingDir, "LNADDR")
if err != nil {
baselog.Fatalf("cannot get logger %v", err)
}
log.Infof("Starting lightning address server on port %v...",
config.AddressServerPort)
clientConn, err := getClientConn(
config.RPCHost, config.TLSCertPath, config.InvoiceMacaroonPath,
)
if err != nil {
log.Errorf("unable to get a lnd client connection: %v", err)
return
}
lndClient := lnrpc.NewLightningClient(clientConn)
settlementHandler := NewSettlementHandler(lndClient)
invoiceManager := NewInvoiceManager(
&InvoiceManagerConfig{
LndClient: lndClient,
SettlementHandler: settlementHandler,
},
)
setupHandlerPerAddress(config)
setupNostrHandlers(config.Nostr)
setupNotificators(config)
setupIndexHandler(config)
http.HandleFunc("/invoice/", useLogger(
invoiceManager.handleInvoiceCreation(config),
))
err = http.ListenAndServe(
fmt.Sprintf(":%d", config.AddressServerPort), nil,
)
if err != nil {
log.Errorf("unable to start server: %v", err)
}
}
func useLogger(h http.HandlerFunc) http.HandlerFunc {
logger := httplog.LoggerWithConfig(httplog.LoggerConfig{
Formatter: httplog.ChainLogFormatter(
httplog.DefaultLogFormatter,
httplog.RequestHeaderLogFormatter,
httplog.RequestBodyLogFormatter,
httplog.ResponseHeaderLogFormatter,
httplog.ResponseBodyLogFormatter,
),
CaptureBody: true,
})
return logger(h).ServeHTTP
}
func setupHandlerPerAddress(config ServerConfig) {
metadata, err := metadataToString(config)
if err != nil {
return
}
for _, addr := range config.LightningAddresses {
addr := strings.Split(addr, "@")[0]
endpoint := fmt.Sprintf("/.well-known/lnurlp/%s", addr)
http.HandleFunc(
endpoint, useLogger(handleLNUrlp(config, metadata)),
)
}
}
func handleLNUrlp(config ServerConfig, metadata string) http.HandlerFunc {
return func(w http.ResponseWriter, r *http.Request) {
resp := LNUrlPay{
MinSendable: config.MinSendableMsat,
MaxSendable: config.MaxSendableMsat,
CommentAllowed: config.MaxCommentLength,
Tag: config.Tag,
Metadata: metadata,
Callback: config.InvoiceCallback,
}
w.Header().Set("Content-Type", "application/json")
w.Header().Set("Access-Control-Allow-Origin", "*")
w.WriteHeader(http.StatusOK)
_ = json.NewEncoder(w).Encode(resp)
}
}
func setupNostrHandlers(nostr *NostrConfig) {
if nostr == nil {
return
}
http.HandleFunc(
"/.well-known/nostr.json",
useLogger(func(w http.ResponseWriter, r *http.Request) {
log.Infof("Nostr request: %#v\n", *r)
w.Header().Set("Content-Type", "application/json")
w.Header().Set("Access-Control-Allow-Origin", "*")
w.WriteHeader(http.StatusOK)
_ = json.NewEncoder(w).Encode(nostr)
}),
)
}
func setupIndexHandler(config ServerConfig) {
if !config.ListAllURLs || len(config.LightningAddresses) == 0 ||
config.ExternalURL == "" {
return
}
type user struct {
User string
Encoded string
QRCode string
}
var users []user
for _, addr := range config.LightningAddresses {
userName := strings.Split(addr, "@")[0]
url := fmt.Sprintf("%s/.well-known/lnurlp/%s",
config.ExternalURL, userName)
converted, err := bech32.ConvertBits([]byte(url), 8, 5, true)
if err != nil {
log.Errorf("Unable to convert url: %v", err)
}
lnurl, err := bech32.Encode("lnurl", converted)
if err != nil {
log.Errorf("Unable to encode url: %v", err)
continue
}
png, err := qrcode.Encode(lnurl, qrcode.Highest, 256)
if err != nil {
log.Errorf("Unable to encode QR code: %v", err)
continue
}
users = append(users, user{
User: userName,
Encoded: lnurl,
QRCode: base64.StdEncoding.EncodeToString(png),
})
}
htmlTemplate := `<!DOCTYPE html>
<html>
<head>
<title>LNURLs</title>
</head>
<body>
<h1>LNURLs</h1>
<ul>
{{range .}}
<li>
<h2>User: {{.User}}</h2>
<img src="data::image/png;base64, {{.QRCode}}" style="margin-left:-18px"/><br/>
<pre>{{.Encoded}}</pre>
</li>
{{end}}
</ul>
</body>
</html>
`
bodyTemlate, err := template.New("html").Parse(htmlTemplate)
if err != nil {
log.Errorf("Error building URL template: %w", err)
return
}
var buf bytes.Buffer
err = bodyTemlate.Execute(&buf, users)
if err != nil {
log.Errorf("Error executing URL template: %w", err)
return
}
http.HandleFunc(
"/", useLogger(func(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "text/html")
w.WriteHeader(http.StatusOK)
_, _ = w.Write(buf.Bytes())
}),
)
}
func metadataToString(config ServerConfig) (string, error) {
thumbnailMetadata, err := thumbnailToMetadata(config.Thumbnail)
if thumbnailMetadata != nil {
config.Metadata = append(config.Metadata, thumbnailMetadata)
}
marshalledMetadata, err := json.Marshal(config.Metadata)
return string(marshalledMetadata), err
}
func thumbnailToMetadata(thumbnailPath string) ([]string, error) {
bytes, err := os.ReadFile(thumbnailPath)
if err != nil {
return nil, err
}
encoding := http.DetectContentType(bytes)
switch encoding {
case "image/jpeg":
encoding = "image/jpeg;base64"
case "image/png":
encoding = "image/png;base64"
default:
return nil, fmt.Errorf("Unsupported encodeing %s of "+
"thumbnail %s.\n", encoding, thumbnailPath)
}
encodedThumbnail := base64.StdEncoding.EncodeToString(bytes)
return []string{encoding, encodedThumbnail}, nil
}
func badRequestError(w http.ResponseWriter, reason string,
args ...interface{}) {
w.WriteHeader(http.StatusBadRequest)
_ = json.NewEncoder(w).Encode(Error{
Status: "Error",
Reason: fmt.Sprintf(reason, args...),
})
}
// maxMsgRecvSize is the largest message our client will receive. We
// set this to 200MiB atm.
var (
maxMsgRecvSize = grpc.MaxCallRecvMsgSize(1 * 1024 * 1024 * 200)
macaroonTimeout int64 = 60
)
func getClientConn(address, tlsCertPath, macaroonPath string) (*grpc.ClientConn,
error) {
// We always need to send a macaroon.
macOption, err := readMacaroon(macaroonPath)
if err != nil {
return nil, err
}
// TODO (hieblmi) Support Tor dialing
opts := []grpc.DialOption{
grpc.WithDefaultCallOptions(maxMsgRecvSize),
macOption,
}
// TLS cannot be disabled, we'll always have a cert file to read.
creds, err := credentials.NewClientTLSFromFile(tlsCertPath, "")
if err != nil {
return nil, err
}
opts = append(opts, grpc.WithTransportCredentials(creds))
conn, err := grpc.Dial(address, opts...)
if err != nil {
return nil, fmt.Errorf("unable to connect to RPC server: %v",
err)
}
return conn, nil
}
// readMacaroon tries to read the macaroon file at the specified path and create
// gRPC dial options from it.
func readMacaroon(macPath string) (grpc.DialOption, error) {
// Load the specified macaroon file.
macBytes, err := os.ReadFile(macPath)
if err != nil {
return nil, fmt.Errorf("unable to read macaroon path : %v", err)
}
mac := &macaroon.Macaroon{}
if err = mac.UnmarshalBinary(macBytes); err != nil {
return nil, fmt.Errorf("unable to decode macaroon: %v", err)
}
// Now we append the macaroon credentials to the dial options.
cred, err := macaroons.NewMacaroonCredential(mac)
if err != nil {
return nil, fmt.Errorf("error creating macaroon credential: %v",
err)
}
return grpc.WithPerRPCCredentials(cred), nil
}