This app is an example of an OAuth 2 provider using Doorkeeper gem, Rails 5.2 and Devise. Check out the app hosted on heroku for a live demo.

For more information about the gem, documentation, wiki and another resources, check out the project on GitHub

First clone the repository from GitHub:

git clone git://github.com/doorkeeper-gem/doorkeeper-provider-app.git

Install all dependencies with:

bundle install

After that you're almost ready to go.

The configuration is quite simple, all you need to do is run:

bundle exec rake db:setup

This will generate all necessary tables, create fake data, create an user and a client application.

The generated user email is [email protected] and password is doorkeeper.

The application id and secret will show up on terminal when the script ends.

After that, you can just fire up the rails server and you're ready to go.

The endpoints is mounted under /oauth so our routes look like this:

GET       /oauth/authorize
POST      /oauth/authorize
DELETE    /oauth/authorize
POST      /oauth/token
resources /oauth/applications

This app provides a sample JSON API under /api/v1. The current API endpoints are:

/api/v1/profiles.json
/api/v1/me.json

In routes.rb you can check out how they're made:

namespace :api do
  namespace :v1 do
    resources :profiles
    get '/me' => "credentials#me"
  end
end

We namespace the API controllers to avoid name clashing and collisions between your existing application and the API. This way, you can make changes to your application without messing up with the API's behavior.

You can find all controllers under /app/controllers/api/v1 folder.

The api_controller.rb works as a parent class to the other controllers. It only defines a method that returns the current resource owner, based on the access token:

def current_resource_owner
  User.find(doorkeeper_token.resource_owner_id) if doorkeeper_token
end

This is required if you want to return data based on the current user, like in credentials_controller.rb

To make your API only available for OAuth users, you need to tell doorkeeper to require an access token in your api controller, like this:

module Api::V1
  class ProfilesController < ApiController
    before_action :doorkeeper_authorize!

    def index
      render json: Profile.recent
    end
  end
end

However, see also the Doorkeeper wiki article about using scopes.

If you attempt to access any of the protected resources without an proper access token, you'll get an 401 Unauthorized response.

You can manage all client applications in /oauth/applications.

If you want to create a client application, check out this example using Sinatra and this another one using Rails and Devise.