class Doorkeeper::OAuth::ClientCredentialsRequest::Validation

def validate_scopes
  return true unless @request.scopes.present?
  application_scopes = if @client.present?
                         @client.application.scopes
                       else
                         ''
                       end
  ScopeChecker.valid?(
    @request.scopes.to_s,
    @server.scopes,
    application_scopes
  )
end