jwt-mongo-sms

jwt-mongo-sms

If you're wondering how to implement authentication with JSON web tokens, Mongo DB, Twilio SMS, and (optionally) GraphQL, you're in the right place!

Installation

npm install jwt-mongo-sms

or

yarn add jwt-mongo-sms

Quickstart

(Before doing anything with this package, you'll need a Mongo database and a Twilio account with a phone number to use for SMS.)

Create an instance of JwtMongoSms:

import JwtMongoSms from 'jwt-mongo-sms';

const {
  JWT_SECRET,
  MONGODB_URI,
  TWILIO_ACCOUNT_SID,
  TWILIO_AUTH_TOKEN,
  TWILIO_SMS_PHONE_NUMBER,
} = process.env;

const jwtMongoSms = new JwtMongoSms({
  jwtSecret: JWT_SECRET,
  mongoUri: MONGODB_URI,
  twilio: {
    accountSid: TWILIO_ACCOUNT_SID,
    authToken: TWILIO_AUTH_TOKEN,
    phoneNumber: TWILIO_SMS_PHONE_NUMBER,
  },
});

export default jwtMongoSms;

Add the middleware to your server:

import express from 'express';
import jwtMongoSms from './jwtMongoSms';

const server = express();

server.use(jwtMongoSms.getAuthMiddleware());

With the middleware you can check request.user in each request to determine which user (if any) has been authenticated! NOTE: You will need to store the JWT on the client using localStorage, cookies, or another method, and send it via the request Authorization header. See the GraphQL samples below.

GraphQL usage

Sample login resolvers:

const sendLoginCode = async (obj, { phoneNumber }) => {
  await jwtMongoSms.sendLoginCode(phoneNumber);

  return true;
};

const verifyLoginCode = async (obj, { phoneNumber, loginCode }) => {
  const { user, authToken } = await jwtMongoSms.verifyLoginCode({ phoneNumber, loginCode });

  return { user, authToken };
};

Sample auth token storage on client with Apollo:

apolloClient.mutate({
  mutation: gql`
    mutation verifyLoginCode($phoneNumber: String!, $loginCode: String!) {
      verifyLoginCode(phoneNumber: $phoneNumber, loginCode: $loginCode) {
        authToken
      }
    }
  `,
  variables: {
    phoneNumber: '[phone]',
    loginCode: '1234',
  },
})
  .then(({ data }) => {
    localStorage.setItem('authToken', data.verifyLoginCode.authToken);
  })

Sample Apollo middleware that makes authorized requests:

networkInterface.use([{
  applyMiddleware(request, next) {
    const authToken = localStorage.getItem('authToken');

    if (!request.options.headers) {
      request.options.headers = {};
    }

    if (authToken) {
      request.options.headers.authorization = `JWT ${authToken}`;
    }

    next();
  },
}]);

Setting context for resolvers that require authentication:

server.use('/graphql', bodyParser.json(), graphqlExpress((request) => ({
  schema,
  context: {
    user: request.user, // Configure this key with "requestKey" (defaults to "user")
  },
})));

Sample query resolver with authentication:

const guardedResolver = (obj, args, { user }) => {
  if (!user) { // If empty, the user was not authenticated
    throw new GraphQLError('Unauthorized');
  }

  return SensitiveUserData.findOne({ userId: user._id });
};

Configuration

There are three required fields when instantiating a JwtMongoSms object: jwtSecret, mongoUri, and twilio. Configuring the rest is optional.

Field	Default Value	Description
jwtSecret		JSON web token secret
mongoUri		Mongo URI (e.g., mongodb://localhost/my-db)
twilio	{}	Twilio credentials (accountSid, authToken) and phoneNumber used to send SMS text
setSmsMessage	(code => `Your login code is ${code}`)	Function used to set the SMS message for login
usersCollectionName	users	Name of the Mongo collection used to store user data
authCollectionName	users	Name of the Mongo collection used to store auth data
requestKey	user	Key your authenticated user will be assigned to on each server request
loginCodeLength	4	Length of login code
loginCodeTimeoutSeconds	600	Number of seconds it takes for a login code to expire

API

There are three methods from the JwtMongoSms class you should use:

getAuthMiddleware() : express.Handler[]

• Returns the middleware needed for authenticating server requests.

sendLoginCode(phoneNumber: string) : Promise<void>

• Sends login code via Twilio SMS. Upserts auth collection document for phoneNumber with new loginCode and loginCodeCreatedAt. NOTE: By default userCollectionName and authCollectionName are both set to users. That means if you don't override these settings, this method will insert a user document for you (if it doesn't already exist). To avoid this behavior, be sure to create the user document beforehand.

verifyLoginCode({ phoneNumber: string, loginCode: string }) : Promise<{ user: Object, authToken: string }>

• Verifies inputted login code. Will throw errors if no auth data is found, no login code has been generated, the compared codes do not match, or if the login code has expired. When verified, the found user document and a generated authToken are returned.