pvnp/index.js

An express middleware meant to detect if P v NP has been solved

const cheerio = require('cheerio');
const request = require('request');
const EventEmitter = require('events');
const default_message = 'Service denied, P v. NP solved. Read more <a href="https://www.claymath.org/millennium-problems/p-vs-np-problem">here</a>';
const default_code = 500;

class PvNP extends EventEmitter {
    middleware(message, code) {
        return (req, res, next) => {
            request("https://www.claymath.org/millennium-problems/p-vs-np-problem", (err, stat, html) => {
                var $ = cheerio.load(html);

                const results = $('#node-problem-112 > div.field-collection-container.clearfix > div > div > div > div > div > div > div.field-items > div').text();

                if (results === "Solved") {
                    res.status(code || default_code).send(message || default_message);
                    this.emit('solved');
                } else {
                    next();
                }
            });
        }
    }
}

module.exports = new PvNP();