passport-selfkey

Passport strategy for authenticating using Login with SelfKey.

This is the passport strategy for integrating Login with SelfKey authentication for NodeJS apps. Reasonably simple to integrate with standard NodeJS middleware including Connect and Express.

Install

$ npm install passport-selfkey

Usage

Configure Strategy

The Login with SelfKey strategy authenticates users using a nonce, signature and ethereum address public key. You will need to include the selfkey.js library to perform the signature verification. This strategy requires a verify callback, which accepts these credentials and calls done providing a user. The request object is passed as the first argument.

const selfkey = require('selfkey.js')
const SelfKeyStrategy = require('passport-selfkey').Strategy

/**
 * Login with SelfKey Passport Config
 */
passport.use(new SelfKeyStrategy((req, nonce, signature, publicKey, done) => {
  // if the signature verification succeeds
  if (selfkey.verifySignature(nonce, signature, publicKey)) {
    // find user with existing wallet
    User.findOne({wallet: publicKey}, (err, existingUser) => {
      if (err) return done(err) 
      // if a wallet is found then add token to user object
      if (existingUser) {
        const token = generateToken()
        User.update({wallet: publicKey}, {token: token}, (err, user) => {
          if (err) return done(err)
          return done(null, user)
        })
      } else {
        // no user with this address
        return done(null, false)
      }
    })
  } else {
    // verification fails
    return done(null, false)
  }
}))

Authenticate Requests

Use passport.authenticate(), specifying the 'selfkey' strategy, to authenticate requests.

For example, as route middleware in an Express application:

app.post('/auth/selfkey', passport.authenticate('selfkey', {session: false}), (req, res) => {
  return res.status(200).json({message: 'Is Authenticated', successUrl: 'https://example.com/success.html'})
})

License

The GPL-3.0 License

Copyright (c) 2018 SelfKey Foundation https://selfkey.org/