module SoarAuthenticationToken
  class TokenProvider
    def initialize(configuration)
      @configuration = configuration
      validate_configuration
      instantiate_provider
    end

    def fetch(request)
      @provider.fetch(request)
    end

    private

    def instantiate_provider
      @provider = Object::const_get(@configuration['authentication_token']['provider'])
                      .new(@configuration['authentication_token'])
    end

    def validate_configuration
      raise 'authentication_token provider must be configured' if @configuration['authentication_token'].nil? or
                                                                  @configuration['authentication_token']['provider'].nil?
    end
  end
end