class Doorkeeper::OAuth::Token

def self.authenticate(request, *methods)
  token = from_request request, *methods
  Doorkeeper::AccessToken.authenticate(token) if token
end

def self.from_request(request, *methods)
  methods.inject(nil) do |credentials, method|
    method = self.method(method) if method.is_a?(Symbol)
    credentials = method.call(request)
    break credentials unless credentials.blank?
  end
end