require 'nickserver/source'
require 'nickserver/response'
require 'nickserver/wkd/url'
require 'nickserver/key_response'

module Nickserver::Wkd
  # Query the web key directory for a given email address
  class Source < Nickserver::Source
    def query(email)
      url = Url.new(email)
      status, blob = adapter.get url,
                                 rescue: 'failed to connect: getaddrinfo'
      if status == 200
        Nickserver::KeyResponse.new(email.to_s, armor_key(blob))
      end
    end

    protected

    def armor_key(blob)
      header + encode(blob) + footer
    end

    def encode(blob)
      Base64.strict_encode64(blob).scan(/.{1,64}/).join "\n"
    end

    def header
      "-----BEGIN PGP PUBLIC KEY BLOCK-----\n\n"
    end

    def footer
      "\n-----END PGP PUBLIC KEY BLOCK-----\n"
    end
  end
end