***

## title: Oauth

## Oauth initialisation

    POST /oauth/init
    {
      'provider': 'github',
      'language': 'fr'
    }

On success:

    200
    {
      'state': '5d5132041ad3f369443f1d7b'
    }

On failure:

    400

*   This triggers an Oauth flow
*   `provider` should be one of `google` or `github`
*   `language` should be one of the [configured language codes](https://github.com/freesewing/backend/blob/develop/src/config/index.js#L32)
*   The frontend will use the state value to initialize an Oauth session. We'll check the state value when we receive the Oauth callback at the backend

## Oauth callback

    GET /oauth/callback/from/:provider

On success: Redirects to the frontend

This is part of the Oauth flow. It fetches the user info from the Oauth provider. If it can't match it with a user, it will create a user account.\
In other words, this will handle both log in and sign up.

The frontend redirect will contain a confirmation ID in the URL that we'll `POST` back in the next Oauth flow step.

## Oauth login

    POST /oauth/login
    {
      'confirmation': '98e132041ad3f369443f1d3d'
    }

On success: The account data
On failure:

    400

This is the last step of the Oauth process. It logs a user in.