index.js

const express = require("express");
const LnurlAuth = require("passport-lnurl-auth");
const passport = require("passport");
const session = require("express-session");
const cors = require("cors");
const path = require("path");

const app = express();

app.use(
  cors({
    origin: "http://localhost:5173",
    credentials: true,
  })
);

const config = {
  host: "localhost",
  port: 3001,
  url: null,
};

if (!config.url) {
  config.url = "http://" + config.host + ":" + config.port;
}

app.use(
  session({
    secret: "12345",
    resave: true,
    saveUninitialized: true,
  })
);

app.use(passport.initialize());
app.use(passport.session());

const map = {
  user: new Map(),
};

passport.serializeUser(function (user, done) {
  done(null, user.id);
});

passport.deserializeUser(function (id, done) {
  done(null, map.user.get(id) || null);
});

passport.use(
  new LnurlAuth.Strategy(function (linkingPublicKey, done) {
    let user = map.user.get(linkingPublicKey);
    if (!user) {
      user = { id: linkingPublicKey };
      map.user.set(linkingPublicKey, user);
    }
    done(null, user);
  })
);

app.use(passport.authenticate("lnurl-auth"));

app.get("/", function (req, res) {
  if (!req.user) {
    return res.send(
      'You are not authenticated. To login go <a href="/login">here</a>.'
    );
    // return res.redirect('/login');
  }
  res.send("Logged-in");
});

app.get(
  "/login",
  function (req, res, next) {
    if (req.user) {
      // Already authenticated.
      return res.redirect("http://localhost:5173/");
    }
    next();
  },
  new LnurlAuth.Middleware({
    callbackUrl: config.url + "/login",
    cancelUrl: "http://localhost:5173/browseDevs",
    loginTemplateFilePath: path.join(__dirname, "login.html"),
  })
);

app.get("/user", (req, res) => {
  res.send(req.user);
});

app.get("/logout", function (req, res, next) {
  if (req.user) {
    req.session.destroy();
    res.json({ message: "user logged out" });
    // Already authenticated.
    return res.redirect("http://localhost:5173");
  }
  next();
});

const server = app.listen(config.port, config.host, function () {
  console.log("Server listening at " + config.url);
});

process.on("uncaughtException", (error) => {
  console.error(error);
});

process.on("beforeExit", (code) => {
  try {
    server.close();
  } catch (error) {
    console.error(error);
  }
  process.exit(code);
});