hub/body.js

'use strict';
// Reads a request body as text, and refuses one that is too big, so a huge upload cannot use up the server's memory.
function readBody(req, max = 2e6) {
  return new Promise((ok, no) => {
    const c = []; let n = 0, done = false;
    req.on('data', d => { if (done) return; n += d.length; if (n > max) { done = true; c.length = 0; const e = new Error('That is too large'); e.status = 413; no(e); return; } c.push(d); });
    req.on('end', () => { if (!done) ok(Buffer.concat(c).toString()); });
    req.on('error', e => { if (!done) no(e); });
  });
}
module.exports = { readBody };