Vote API

README.md

npm install express body-parser jsonwebtoken node-localstorage express-rate-limit

server.js

const express = require('express');
const bodyParser = require('body-parser');
const jwt = require('jsonwebtoken');
const { LocalStorage } = require('node-localstorage');
const rateLimit = require('express-rate-limit');

const app = express();
const localStorage = new LocalStorage('./database');
const secretKey = 'my-secret-key';

// Use body-parser to parse JSON requests and responses
app.use(bodyParser.json());

// Set up rate limiter to prevent spamming
const limiter = rateLimit({
  windowMs: 60 * 1000, // 1 minute
  max: 5, // limit each IP to 5 requests per windowMs
  message: 'Too many requests, please try again later.',
});
app.use(limiter);

app.post('/vote', (req, res) => {
  // Verify the JWT token in the Authorization header
  try {
    const token = req.headers.authorization.split(' ')[1];
    const decoded = jwt.verify(token, secretKey);
  } catch (err) {
    return res.status(401).json({ message: 'Invalid or missing token' });
  }

  // Get the vote object and user token from the request body
  const { vote, userToken } = req.body;

  // Update the database with the new vote
  const votes = JSON.parse(localStorage.getItem('votes')) || {};
  const existingVote = votes[vote.itemId];
  if (existingVote) {
    existingVote[vote.option] += 1;
  } else {
    votes[vote.itemId] = { [vote.option]: 1 };
  }
  localStorage.setItem('votes', JSON.stringify(votes));

  // Return the current vote results for the items voted on
  return res.status(200).json({ votes });
});

app.listen(3000, () => console.log('Server started on port 3000'));