Doorkeeper - Assertion Grant Extension

Assertion grant extension for Doorkeeper. Born from: https://github.com/doorkeeper-gem/doorkeeper/pull/249

Instalation

1. Add both gems to your Gemfile.
2. Add assertion as a grant_flow to your initializer.

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Lets you define your own way of authenticating resource owners via 3rd Party applications. For example, via Facebook:

Doorkeeper.configure do
  resource_owner_from_assertion do
    facebook = URI.parse('https://graph.facebook.com/me?access_token=' +
    params[:assertion])
    response = Net::HTTP.get_response(facebook)
    user_data = JSON.parse(response.body)
    User.find_by_facebook_id(user_data['id'])
  end
end

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IETF standard: http://tools.ietf.org/html/draft-ietf-oauth-assertions-16