```ruby
class Oauth::AuthorizationsController < Doorkeeper::AuthorizationsController
  before_action :authenticate_resource_owner!

  layout 'profile'

  def new
    if pre_auth.authorizable?
      if skip_authorization? || matching_token?
        auth = authorization.authorize
        session.delete(:user_return_to)
        redirect_to auth.redirect_uri
      else
        render "doorkeeper/authorizations/new"
      end
    else
      render "doorkeeper/authorizations/error"
    end
  end

  # TODO: Handle raise invalid authorization
  def create
    redirect_or_render authorization.authorize
  end

  def destroy
    redirect_or_render authorization.deny
  end

  private

  def matching_token?
    Doorkeeper::AccessToken.matching_token_for(pre_auth.client,
                                               current_resource_owner.id,
                                               pre_auth.scopes)
  end

  def redirect_or_render(auth)
    if auth.redirectable?
      redirect_to auth.redirect_uri
    else
      render json: auth.body, status: auth.status
    end
  end

  def pre_auth
    @pre_auth ||=
      Doorkeeper::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
end
```

Remove duplicated code in Oauth::AuthorizationsController
user
```ruby
class Oauth::AuthorizationsController < Doorkeeper::AuthorizationsController
  layout 'profile'

  # Overriden from Doorkeeper::AuthorizationsController to
  # include the call to session.delete
  def new
    if pre_auth.authorizable?
      if skip_authorization? || matching_token?
        auth = authorization.authorize
        session.delete(:user_return_to)
        redirect_to auth.redirect_uri
      else
        render "doorkeeper/authorizations/new"
      end
    else
      render "doorkeeper/authorizations/error"
    end
  end
end
```
assistant