authorizations_controller.rb

module Doorkeeper
  class AuthorizationsController < Doorkeeper::ApplicationController
    before_action :authenticate_resource_owner!

    def new
      if pre_auth.authorizable?
        render_success
      else
        render_error
      end
    end

    # TODO: Handle raise invalid authorization
    def create
      redirect_or_render authorize_response
    end

    def destroy
      redirect_or_render authorization.deny
    end

    private

    def render_success
      if skip_authorization? || matching_token?
        redirect_or_render authorize_response
      elsif Doorkeeper.configuration.api_only
        render json: pre_auth
      else
        render :new
      end
    end

    def render_error
      if Doorkeeper.configuration.api_only
        render json: pre_auth.error_response.body,
               status: :bad_request
      else
        render :error
      end
    end

    def matching_token?
      token = AccessToken.matching_token_for(
        pre_auth.client,
        current_resource_owner.id,
        pre_auth.scopes
      )

      token && token.accessible?
    end

    def redirect_or_render(auth)
      if auth.redirectable?
        if Doorkeeper.configuration.api_only
          render(
            json: { status: :redirect, redirect_uri: auth.redirect_uri },
            status: auth.status
          )
        else
          redirect_to auth.redirect_uri
        end
      else
        render json: auth.body, status: auth.status
      end
    end

    def pre_auth
      @pre_auth ||= OAuth::PreAuthorization.new(Doorkeeper.configuration,
                                                server.client_via_uid,
                                                params)
    end

    def authorization
      @authorization ||= strategy.request
    end

    def strategy
      @strategy ||= server.authorization_request pre_auth.response_type
    end

    def authorize_response
      @authorize_response ||= begin
        authorizable = pre_auth.authorizable?
        before_successful_authorization if authorizable
        auth = strategy.authorize
        after_successful_authorization if authorizable
        auth
      end
    end

    def after_successful_authorization
      Doorkeeper.configuration.after_successful_authorization.call(self)
    end

    def before_successful_authorization
      Doorkeeper.configuration.before_successful_authorization.call(self)
    end
  end
end