fastify-aws-jwt-verify

Fastify plugin wrapper around aws-jwt-verify for JWT authentication/authorization with AWS Cognito

The options provided to the plugin registration are passed directly to CognitoJwtVerifier.create with helpers for ease of reuse.

Install

npm i fastify-aws-jwt-verify

Usage

Register as a plugin, providing the following options:

tokenProvider

Either use a built-in method for extracting the JWT token from a request or provide your own

Built-in method(~~s~~)

• Bearer: Follow the Bearer Authorization scheme, where the token is provided via the Authorization header with value Bearer <TOKEN>

Custom token provider

Accept the FastifyRequest object and return the extracted string token, e.g.

await fastify.register(FastifyAwsJwtVerify, {
  tokenProvider: req => {
    if ('X-Auth-Token' in req.headers) {
      return req.headers['X-Auth-Token']
    } else {
      throw new Unauthorized("Missing 'X-Auth-Token' header")
    }
  },
  userPoolId: 'user-pool-id'
})

User pool options

Plugin configuration supports scenarios for both a single user pool or multiple potential user pools.

Single user pool

For a single user pool, set verifier fields in the top-level plugin configuration object, e.g.

await fastify.register(FastifyAwsJwtVerify, {
  clientId: 'app-client-id',
  tokenProvider: 'Bearer',
  tokenUse: 'access',
  userPoolId: 'user-pool-id'
})

For complete set of options, see the aws-jwt-verify package documentation

Multiple user pools

For multiple user pools, set verifier fields in the pools field of the plugin configuration, e.g.

await fastify.register(FastifyAwsJwtVerify, {
  pools: [
    {
      clientId: 'app-client-id-1',
      tokenUse: 'access',
      userPoolId: 'user-pool-1'
    },
    {
      clientId: 'app-client-id-2',
      tokenUse: 'access',
      userPoolId: 'user-pool-2'
    }
  ],
  tokenProvider: 'Bearer'
})

For complete set of options, see the aws-jwt-verify package documentation

Request handlers

Registering the plugin on its own does not require authentication/authorization on any route. Three decorators are provided to simplify attaching handlers.

auth.require(options?: FastifyAwsJwtVerifyOptions)

If no options provided, requires authorization based on the options provided at plugin registration time. This is the simplest usage.

fastify.addHook('onRequest', fastify.auth.require())

If any option is provided, it overrides the corresponding option in the base plugin configuration options. (Note: Providing the pools field here overrides the entire pools field in the base options.)

fastify.addHook('onRequest', fastify.auth.require({
  groups: [ 'Administrators', 'Moderators' ]
}))

auth.client(...clientIds: string[])

Specify allowed client IDs in place of the base configuration options, e.g.

fastify.addHook('onRequest', fastify.auth.client( 'app-client-1', 'app-client-2' ))

This is semantically equivalent to

fastify.addHook('onRequest', fastify.auth.require({
  clientId: [ 'app-client-1', 'app-client-2' ]
}))

auth.groups(...groups: string[])

Specify allowed groups in place of the base configuration options, e.g.

fastify.addHook('onRequest', fastify.auth.groups( 'Administrators', 'Moderators' ))

This is semantically equivalent to

fastify.addHook('onRequest', fastify.auth.require({
  groups: [ 'Administrators', 'Moderators' ]
}))

User payload

Upon successful JWT verification, the request is decorated with the decoded user payload in the user field.

fastify.post('/item', {
  onRequest: fastify.auth.groups('Administrators')
}, req => {
  fastify.log.info(`User: ${req.user}`)
  // Add item
})

Example

const fastify = Fastify()

await fastify.register(fp(fastifyAwsJwtVerifyPlugin), {
    clientId: 'app-client-1',
    tokenProvider: 'Bearer',
    tokenUse: 'access',
    userPoolId: 'user-pool-1'
})

// No authorization required
await fastify.get('/', req => { /** Handle request **/ })

// Require authorization based on registration options
await fastify.get('/account', {
  onRequest: fastify.auth.require()
}, req => { /** Handle request **/ })

// Administrators group membership required
await fastify.post('/item', {
  onRequest: fastify.auth.groups('Administrators')
}, req => { /** Handle request **/ })

License

Licensed under Apache 2.0