doorkeeper_server.rb

begin
  require 'bundler/inline'
rescue LoadError => e
  $stderr.puts 'Bundler version 1.10 or later is required. Please update your Bundler'
  raise e
end

gemfile(true) do
  source 'https://rubygems.org'

  gem 'sqlite3'
  # gem 'pg'
  gem 'rails', '~> 5.2'
  gem 'listen'
  gem 'puma'
  gem 'doorkeeper', '~> 5.0'
end

require 'rails'

require 'active_storage/engine'
require 'active_model/railtie'
require 'active_record/railtie'
require 'action_controller/railtie'
require 'action_mailer/railtie'
require 'action_view/railtie'
require 'action_controller/railtie'
require 'sprockets/railtie'

require 'doorkeeper'
require 'rack/handler/puma'

ActiveRecord::Base.establish_connection(adapter: 'sqlite3', database: ':memory:')
ActiveRecord::Base.logger = Logger.new(STDOUT)

ActiveRecord::Schema.define do
  create_table :oauth_applications do |t|
    t.string :name, null: false
    t.string :uid, null: false
    t.string :secret, null: false
    t.text :redirect_uri, null: false
    t.string :scopes, null: false, default: ''
    t.boolean :confidential, null: false, default: true
    t.timestamps null: false
  end

  add_index :oauth_applications, :uid, unique: true

  create_table :oauth_access_grants do |t|
    t.references :resource_owner, null: false
    t.references :application, null: false
    t.string :token, null: false
    t.integer :expires_in, null: false
    t.text :redirect_uri, null: false
    t.datetime :created_at, null: false
    t.datetime :revoked_at
    t.string :scopes
  end

  add_index :oauth_access_grants, :token, unique: true
  add_foreign_key(
    :oauth_access_grants,
    :oauth_applications,
    column: :application_id
  )

  create_table :oauth_access_tokens do |t|
    t.references :resource_owner, index: true
    t.references :application

    t.string :token, null: false

    t.string :refresh_token
    t.integer :expires_in
    t.datetime :revoked_at
    t.datetime :created_at, null: false
    t.string :scopes

    t.string :previous_refresh_token, null: false, default: ''
  end

  add_index :oauth_access_tokens, :token, unique: true
  add_index :oauth_access_tokens, :refresh_token, unique: true
  add_foreign_key(
    :oauth_access_tokens,
    :oauth_applications,
    column: :application_id
  )
end

class DoorkeeperTestApp < Rails::Application
  config.load_defaults 5.1
  secrets.secret_token = 'secret_token'
  secrets.secret_key_base = 'secret_key_base'
  config.eager_load = false

  config.logger = Logger.new($stdout)
  Rails.logger = config.logger
end

Rails.application.initialize!

Doorkeeper.configure do
  orm :active_record

  grant_flows %w[password authorization_code client_credentials]

  skip_authorization do
    true
  end
end

Rails.application.routes.draw do
  use_doorkeeper
end

Rack::Handler::Puma.run(DoorkeeperTestApp, Port: 3000)

# $ ruby doorkeeper_server.rb