class Acme::Client

def challenge_from_hash(arguments)
  attributes = arguments.to_h
  %w(type uri token).each do |key|
    raise ArgumentError, "missing key: #{key}" unless attributes.key?(key)
  end
  case attributes.fetch('type')
  when 'http-01'
    Acme::Client::Resources::Challenges::HTTP01.new(self, attributes)
  when 'dns-01'
    Acme::Client::Resources::Challenges::DNS01.new(self, attributes)
  when 'tls-sni-01'
    Acme::Client::Resources::Challenges::TLSSNI01.new(self, attributes)
  else
    raise 'Unsupported resource type'
  end
end