express-activitypub/routes/webfinger.js

'use strict';
const express = require('express'),
      router = express.Router();

router.get('/', function (req, res) {
  let resource = req.query.resource;
  if (!resource || !resource.includes('acct:')) {
    return res.status(400).send('Bad request. Please make sure "acct:USER@DOMAIN" is what you are sending as the "resource" query parameter.');
  }
  else {
    let name = resource.replace('acct:','');
    let db = req.app.get('db');
    db.get('select webfinger from accounts where name = $name', {$name: name}, (err, result) => {
      if (result === undefined) {
        return res.status(404).send(`No record found for ${name}.`);
      }
      else {
        res.json(JSON.parse(result.webfinger));
      }
    });
  }
});

module.exports = router;