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Doorkeeper is an OAuth 2 provider for Ruby on Rails / Grape
Doorkeeper is a gem (Rails engine) that makes it easy to introduce OAuth 2 provider functionality to your Ruby on Rails or Grape application. Doorkeeper is an oAuth2 provider built in Ruby. It integrates with Ruby on Rails and Grape frameworks. The installation process depends on the framework you're using. Doorkeeper follows Rails maintenance policy and supports only supported versions of the framework.