@luckbox/token-data-middleware

token-data-middleware

Validates and extracts data from signed tokens

Examples

Express 4.x middleware

const express = require('express');
const fs = require('fs');

const app = express();

const { tokenData } = require('@luckbox/token-data-middleware');
const publicKey = fs.readFileSync('id_ecdsa.pub.pem');

app.use(tokenData(publicKey, 'Custom-Token-Header'));

app.post('/message', (req, res) => {
  if (!req.tokenData.id) {
    return res.status(403).send('Permission denied');
  }

  // new message logic goes here...
});

app.listen(80);

Manual usage

const fs = require('fs');

const { parser } = require('@luckbox/token-data-middleware');
const publicKey = fs.readFileSync('id_ecdsa.pub.pem');

const tokenParser = parser(publicKey);

const token = 'qZPb3DyNIOnTeRv4oSy5TraslRO41AYjDlxSttpW5PWIcKIwqvlGDgMWPjhbIKpdcoX6mfsG9dwC-JRz5wbVAgeyJpZCI6MTIzNDV9';

const tokenData = tokenParser(token);
console.log(tokenData); // { id: 12345 }

API

Methods

module#parser(publicKey) : tokenParser()

Initializes a new token parser.

Name	Type	Description
publicKey	`String	Buffer`

module#tokenData(publicKey[, headerName]) : ExpressMiddleware

Creates a new Express 4.x middleware.

Name	Type	Default	Description
publicKey	`String	Buffer`
headerName	String	"Token"	An optional name for the header from which to extract the token data

sign(payload, privateKey) : Object

Signs a payload and generates a token provided an ECDSA private key.

Name	Type	Description
payload	any	Payload to sign
privateKey	String	PEM-formatted private key

tokenParser(token) : Object

Parses a signed token and returns the data contained within. In case the token is invalid, an empty object is returned.

Name	Type	Description
publicKey	String	PEM-formatted public key