api/server/routes/oauth.js

const passport = require('passport');
const express = require('express');
const router = express.Router();
const config = require('../../../config/loader');
const { setAuthTokens } = require('../services/AuthService');
const { loginLimiter, checkBan } = require('../middleware');
const domains = config.domains;

router.use(loginLimiter);

const oauthHandler = async (req, res) => {
  try {
    await checkBan(req, res);
    if (req.banned) {
      return;
    }
    await setAuthTokens(req.user._id, res);
    res.redirect(domains.client);
  } catch (err) {
    console.error('Error in setting authentication tokens:', err);
  }
};

/**
 * Google Routes
 */
router.get(
  '/google',
  passport.authenticate('google', {
    scope: ['openid', 'profile', 'email'],
    session: false,
  }),
);

router.get(
  '/google/callback',
  passport.authenticate('google', {
    failureRedirect: `${domains.client}/login`,
    failureMessage: true,
    session: false,
    scope: ['openid', 'profile', 'email'],
  }),
  oauthHandler,
);

router.get(
  '/facebook',
  passport.authenticate('facebook', {
    scope: ['public_profile'],
    profileFields: ['id', 'email', 'name'],
    session: false,
  }),
);

router.get(
  '/facebook/callback',
  passport.authenticate('facebook', {
    failureRedirect: `${domains.client}/login`,
    failureMessage: true,
    session: false,
    scope: ['public_profile'],
    profileFields: ['id', 'email', 'name'],
  }),
  oauthHandler,
);

router.get(
  '/openid',
  passport.authenticate('openid', {
    session: false,
  }),
);

router.get(
  '/openid/callback',
  passport.authenticate('openid', {
    failureRedirect: `${domains.client}/login`,
    failureMessage: true,
    session: false,
  }),
  oauthHandler,
);

router.get(
  '/github',
  passport.authenticate('github', {
    scope: ['user:email', 'read:user'],
    session: false,
  }),
);

router.get(
  '/github/callback',
  passport.authenticate('github', {
    failureRedirect: `${domains.client}/login`,
    failureMessage: true,
    session: false,
    scope: ['user:email', 'read:user'],
  }),
  oauthHandler,
);
router.get(
  '/discord',
  passport.authenticate('discord', {
    scope: ['identify', 'email'],
    session: false,
  }),
);

router.get(
  '/discord/callback',
  passport.authenticate('discord', {
    failureRedirect: `${domains.client}/login`,
    failureMessage: true,
    session: false,
    scope: ['identify', 'email'],
  }),
  oauthHandler,
);

module.exports = router;