Oauth2 workflow for sinatra + angular.js app

We want to build three example apps.

  1. sinatra oauth2 provider
  2. rails app with angular.js on frontend auhenticated through 1 app
  3. sinatra on backend and angular.js on frontend auhenticated through 1

Our Rails/Sinatra app will be authenticate users using satelizer
and our custom provider.

These is our Oauth2 workflow right now.

  1. Using Satellizer we get the authorization code from provider. We
    send this code to our backend.

  2. In backend using this authorization code, secret key and other
    params, we send an request to provider to get an access token.

  3. Using this obtain access token we call ‘/me’ action to get an
    email and other user attributes from provider.

  4. In the same action we parse the response body and we find or create
    user based on uid.

  5. We are wondering about this step which should somehow set the user’s
    authentication token.

  • store the provider access token in user database record.
  • generate new authentication token and change it on every request
  1. Generate JWToken with user uid and token and send it back to
  2. Then on each request Satellizer include Bearer JWToken in header.
    After recive request our backend verify header token stored in database
    and call sing_in method in our case devise(sign_in, store: false) maybe
    in sinatra app we will use warden.

What do you think about this concept? Maybe we are missing something.
These is our first Oauth2 authentication implementation and we are
worried about it.

Why not devise+omniauth?

I am not talking about tools but workflow. I want to understand what is
going on behind the scene.