Encrypted homework

hw.js

const express = require('express');
const app = express();
const crypto = require('crypto');

const supportedAlgos = new Set(['SHA1', 'SHA256', 'SHA512']);

app.use(express.static('./'));

app.get('/encrypt', (req, res) => {
  const { algorithm, string } = req.query;

  if (supportedAlgos.has(algorithm) && string.length > 0) {
    try {
      const encrypted = crypto.createHash(algorithm).update(string).digest('base64');
      res.json({
        statusCode: 200,
        message: encrypted
      });
    } catch(error) {
      res.json({
        statusCode: 500,
        message: 'Something went wrong. Please try again.'
      });
    }
  } else if (string.length === 0) {
    res.json({
      statusCode: 400,
      message: 'Empty string cannot be hashed.'
    });
  } else {
    res.json({
      statusCode: 400,
      message: 'Algorithm not supported.'
    });
  }
});

app.listen(1337, () => console.log('Listening on port 1337'))