vic / verily

Demo application for APW subscriptions via websockets

Verily

This is a demo application to serve as an example of how to use Apollo Phoenix Websocket with Absinthe subscriptions.

Verily implements a mail authentication app, akin to Facebook AccountKit. That is, the user enters their email and clicks on Login, then the application awaits (via gql subscription) for the user to verify via a link on their inbox. The app receives the subscription data and logins the user automatically.

Installation

$ git clone https://github.com/vic/verily.git
$ cd verily
$ mix deps.get
$ yarn install
$ mix phoenix.server
$ open http://localhost:4000/

Code

The backend code is just a simple plug application that exposes a tiny GQL API with Absinthe.

Of these the most interesting one is the viewer subscription. It takes a device_token as topic (in my example, every client, eg mobile device or browser must generate a unique device token for its viewer subscription to work)

Verification is made via an email_login mutation that basically generates a random verification token (that will be sent via email) and starts a tiny process using an Elixir Registry. These veirfier processes live just five minutes, so that if no one confirms the email, the process automatically dies and the token becomes invalid. When the user cliks on the link with the token, the backend terminates the verifier process and sends the original email to the client via the GraphQL websocket subscription.

The client code is at web/static/js and most of it has nothing to do with Apollo Phoenix Websocket, haha, the apollo client configuration is made at apollo.js which also prefers to convert promises and observers into xstreams (as I just wanted to use them for this example) the api is defined at api.js, the app.js is where views and logic is bound together.