well-goknown/lightningpub/well-known.go

package lightningpub

import (
	"encoding/json"
	"fmt"
	"io/ioutil"
	"net"
	"net/http"

	"git.devvul.com/asara/gologger"
	"git.devvul.com/asara/well-goknown/config"
	"github.com/jmoiron/sqlx"
)

var (
	DB *sqlx.DB
)

type lnurlp struct {
	Tag         string `json:"tag"`
	Callback    string `json:"callback"`
	MaxSendable int64  `json:"maxSendable"`
	MinSendable int64  `json:"minSendable"`
	Metadata    string `json:"metadata"`
	AllowsNostr bool   `json:"allowsNostr"`
	NostrPubkey string `json:"nostrPubkey"`
}

func GetLnurlp(w http.ResponseWriter, r *http.Request) {
	l := gologger.Get(config.GetConfig().LogLevel).With().Caller().Logger()

	// normalize domain
	domain, _, err := net.SplitHostPort(r.Host)
	if err != nil {
		domain = r.Host
	}

	name := r.PathValue("name")
	var lnwallet string
	err = DB.QueryRow("SELECT wallet FROM lnwallets WHERE name=$1 AND domain=$2", name, domain).Scan(&lnwallet)
	if err != nil {
		l.Debug().Msgf("user (%s@%s) doesn't exist: %s", name, domain, err.Error())
		http.Error(w, http.StatusText(http.StatusNotFound), http.StatusNotFound)
		return
	}

	//upstreamUrl := fmt.Sprintf("https://%s/api/guest/lnurl_pay/info?k1=%s", domain, lnwallet)
	upstreamUrl := fmt.Sprintf("https://%s/api/guest/lnurl_pay/info?k1=%s", domain, lnwallet)
	upstreamPayload, err := http.Get(upstreamUrl)
	if err != nil {
		l.Debug().Msgf("user (%s@%s) doesn't exist: %s", name, domain, err.Error())
		http.Error(w, http.StatusText(http.StatusNotFound), http.StatusNotFound)
		return
	}

	defer upstreamPayload.Body.Close()
	body, err := ioutil.ReadAll(upstreamPayload.Body)
	if err != nil {
		l.Debug().Msgf("user (%s@%s) doesn't exist: %s", name, domain, err.Error())
		http.Error(w, http.StatusText(http.StatusNotFound), http.StatusNotFound)
		return
	}

	lnurlpReturn := lnurlp{}
	err = json.Unmarshal(body, &lnurlpReturn)
	if err != nil {
		l.Debug().Msgf("user (%s@%s) doesn't exist: %s", name, domain, err.Error())
		http.Error(w, http.StatusText(http.StatusNotFound), http.StatusNotFound)
		return
	}

	m := fmt.Sprintf("[[\"text/plain\", \"ln address payment to a user on the devvul server\"],[\"text/identifier\", \"%s@%s\"]]", name, domain)
	lnurlpReturn.Metadata = m

	ret, err := json.Marshal(lnurlpReturn)
	if err != nil {
		l.Debug().Msgf("user (%s@%s) doesn't exist: %s", name, domain, err.Error())
		http.Error(w, http.StatusText(http.StatusNotFound), http.StatusNotFound)
		return
	}

	l.Debug().Msgf("returning lnwallet for %s@%s", name, domain)
	w.Header().Set("Content-Type", "application/json")
	w.WriteHeader(http.StatusOK)
	w.Write(ret)
	return
}