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helpers.go
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/
helpers.go
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package main
import (
"crypto/sha256"
"encoding/hex"
"fmt"
"math/rand"
"time"
"github.com/btcsuite/btcd/btcec"
"github.com/btcsuite/btcd/chaincfg"
"github.com/fiatjaf/go-lnurl"
lightning "github.com/fiatjaf/lightningd-gjson-rpc"
"github.com/lightningnetwork/lnd/lnwire"
"github.com/lightningnetwork/lnd/zpay32"
"github.com/lucsky/cuid"
"github.com/tidwall/gjson"
)
type Preferences struct {
Disposable bool
}
var letterRunes = []rune("abcdefghijklmnopqrstuvwxyz ABCDEFGHIJKLMNOPQRSTUVWXYZ")
func randomLetter() string {
return string(letterRunes[rand.Intn(len(letterRunes))])
}
var privkey, _ = btcec.NewPrivateKey(btcec.S256())
func makeLNURLPayParams(session string) lnurl.LNURLPayParams {
metadata := lnurl.Metadata{}
metadata.Image.DataURI = "data:image/png;base64," + image
for i := 0; i < rand.Intn(50); i++ {
metadata.Description += randomLetter()
metadata.LongDescription += randomLetter() + randomLetter()
}
min, max := generateMinMax()
var commentAllowed int
if rand.Intn(10) > 5 {
commentAllowed = rand.Intn(15)
}
return lnurl.LNURLPayParams{
Callback: fmt.Sprintf("%s/lnurl-pay/callback/%s", s.ServiceURL, session),
MinSendable: min,
MaxSendable: max,
Metadata: metadata,
EncodedMetadata: metadata.Encode(),
Tag: "payRequest",
CommentAllowed: int64(commentAllowed),
PayerData: lnurl.PayerDataSpec{
LightningAddress: &lnurl.PayerDataItemSpec{},
Email: &lnurl.PayerDataItemSpec{},
FreeName: &lnurl.PayerDataItemSpec{},
PubKey: &lnurl.PayerDataItemSpec{},
KeyAuth: &lnurl.PayerDataKeyAuthSpec{K1: lnurl.RandomK1()},
},
}
}
func makeInvoice(
msat int64,
params lnurl.LNURLPayParams,
payerdata string,
) (string, []byte) {
preimage, _ := hex.DecodeString(lnurl.RandomK1())
var h [32]byte
if payerdata == "" {
h = params.HashMetadata()
} else {
h = params.HashWithPayerData(payerdata)
}
var bolt11 string
var err error
spark := &lightning.Client{
SparkURL: s.SparkoURL,
SparkToken: s.SparkoToken,
CallTimeout: time.Second * 3,
}
var inv gjson.Result
inv, err = spark.CallNamed("invoicewithdescriptionhash",
"msatoshi", msat,
"label", "lnurl.bigsun.xyz/"+cuid.Slug(),
"description_hash", hex.EncodeToString(h[:]),
"preimage", hex.EncodeToString(preimage),
)
bolt11 = inv.Get("bolt11").String()
if err != nil {
log.Warn().Err(err).Msg("couldn't generate real invoice, using a fake")
return makeFakeInvoice(msat, h, preimage), preimage
}
return bolt11, preimage
}
func makeFakeInvoice(msat int64, h [32]byte, preimage []byte) string {
hash := sha256.Sum256(preimage)
invoice, _ := zpay32.NewInvoice(
&chaincfg.Params{Bech32HRPSegwit: "bc"},
hash,
time.Now(),
zpay32.Destination(privkey.PubKey()),
zpay32.DescriptionHash(h),
zpay32.Amount(lnwire.MilliSatoshi(msat)),
zpay32.Expiry(time.Minute*60),
)
bolt11, _ := invoice.Encode(zpay32.MessageSigner{
SignCompact: func(hash []byte) ([]byte, error) {
return btcec.SignCompact(btcec.S256(),
privkey, hash, true)
},
})
return bolt11
}
func generateMinMax() (min, max int64) {
if rand.Int63n(100) < 30 {
fixed := (1 + rand.Int63n(15)) * 1000
min = fixed
max = fixed
} else {
min = (1 + rand.Int63n(5)) * 1000
max = min * 4
}
return
}
func randomSuccessAction(
preimage []byte,
comment string,
payer lnurl.PayerDataValues,
) *lnurl.SuccessAction {
switch rand.Intn(3) {
case 0:
var message string
switch {
case payer.FreeName != "":
message = fmt.Sprintf("Obrigado, %s! ", payer.FreeName)
case payer.LightningAddress != "":
message = fmt.Sprintf("Děkuji, %s! ", payer.LightningAddress)
case payer.PubKey != "":
message = fmt.Sprintf("Gracias, %s! ", payer.PubKey)
case payer.KeyAuth != nil:
message = fmt.Sprintf("Grazie, %s! ", payer.KeyAuth.Key)
default:
message = "Thank you! "
}
if comment != "" {
message += fmt.Sprintf("You said: '%s'", comment)
}
return lnurl.Action(message, "")
case 1:
var message string
if payer.PubKey != "" {
message += fmt.Sprintf("Gracias, %s! ", payer.PubKey[:5])
}
if payer.LightningAddress != "" {
message += fmt.Sprintf("Děkuji, %s! ", payer.LightningAddress)
}
if payer.KeyAuth != nil {
message += fmt.Sprintf("Grazie, %s! ", payer.KeyAuth.Key[:5])
}
if payer.FreeName != "" {
message += fmt.Sprintf("Obrigado, %s! ", payer.FreeName)
}
if comment != "" {
message += fmt.Sprintf("You said: '%s'. ", comment)
}
message += "Here is your URL:"
return lnurl.Action(message, "https://fiatjaf.com/")
case 2:
var name string
switch {
case payer.FreeName != "":
name = payer.FreeName
case payer.LightningAddress != "":
name = payer.LightningAddress
case payer.PubKey != "":
name = payer.PubKey
case payer.KeyAuth != nil:
name = payer.KeyAuth.Key
default:
name = "Anonymous Donor"
}
var message string
var secret string
if comment == "" {
message = "Your secret name is: "
secret = name
} else {
message = fmt.Sprintf("Hello %s, your secret comment was: ", name)
secret = comment
}
a, _ := lnurl.AESAction(message, preimage, secret)
return a
}
return nil
}