Cryotokens

Simple NodeJS module to keep and check against a list of JSON Web Tokens (JWT) until their expiration, allowing for a "logout" and "logout from all other devices" functionality to auth systems that use stateless tokens.

⚠️ Warning! ⚠️

This is a work in progress and is NOT production ready yet.

Prerequisites

A running Redis server is needed, unless running Test mode (in memory) as specified in the Configuration section below.

If the "logout from all other devices" functionality (freezeSub method) is used, the JWT needs to have a sub property in their payload, which refers to the subscriber (usually the id of the user associated with that token). This is required to filter all tokens from the same user.

Installation

$ npm install --save cryotokens

Usage

Initialization (a secret is required)

The modules needs to be initialized (ran as a function) and has only one required parameter: the secret used to verify the JWT.

const ct = require('cryotokens')('somesecret');

Ideally this isn't hardcoded on your code but instead grabbed as a environment variable:

const secret = process.env.JWT_SECRET;
const ct = require('cryotokens')(secret);

Freeze token (Logout)

ct.freeze(token);

Freeze subscriber (Logout from all devices)

ct.freezeSub(token);

Check token

Returns the decoded token if it's not on the list and valid. Otherwise it throws an error if the token is frozen, expired or invalid.

ct.check(token)
  .then(decoded => console.log('Decoded token: ', decoded))
  .catch(error => console.log('An error ocurred', error));

or inside try/catch blocks:

try {
  const decoded = ct.check(token);
  console.log('Decoded token: ', decoded));
} catch(error) {
  console.log('An error ocurred', error));
}

Configuration

Cryotokens uses this redis client and thus accepts its options listed here. It uses the default host (127.0.0.1) and port (6379) for the Redis server. The only option this library sets is prefix, which adds cryotokens: to beginning of the database keys.

Those options can be overriden by passing a second parameter to the imported module:

const config = {host: 'somehost.com', port: 6378};
const ct = require('cryotokens')('somesecret', config);

Test mode (in memory)

To store tokens in memory (no Redis install needed) just pass {test: true} as second parameter.

const ct = require('cryotokens')('somesecret', {test: true});

Tests

Tests use jest, redis-mock and sinon (for simulating expiry). To run them:

$ npm test

Contributing

Pull requests are welcome. For major changes, please open an issue first to discuss what you would like to change.

Please make sure to update tests as appropriate.

Roadmap

• [ ] Better error handling
• [ ] Express middleware that validates token from request header and handles auth
• [ ] Fail safely (if Redis is down)

License

MIT