class Devise::SecretKeyFinder

def find
  if @application.respond_to?(:credentials) && key_exists?(@application.credentials)
    @application.credentials.secret_key_base
  elsif @application.respond_to?(:secrets) && key_exists?(@application.secrets)
    @application.secrets.secret_key_base
  elsif @application.config.respond_to?(:secret_key_base) && key_exists?(@application.config)
    @application.config.secret_key_base
  elsif @application.respond_to?(:secret_key_base) && key_exists?(@application)
    @application.secret_key_base
  end
end