class ActionMailbox::PostfixRelayer

def client
  @client ||= Net::HTTP.new(uri.host, uri.port).tap do |connection|
    if uri.scheme == "https"
      require "openssl"
      connection.use_ssl     = true
      connection.verify_mode = OpenSSL::SSL::VERIFY_PEER
    end
    connection.open_timeout = 1
    connection.read_timeout = 10
  end
end

def initialize(url:, username: "actionmailbox", password:)
  @uri, @username, @password = URI(url), username, password
end

def post(source)
  client.post uri, source,
    "Content-Type"  => CONTENT_TYPE,
    "User-Agent"    => USER_AGENT,
    "Authorization" => "Basic #{Base64.strict_encode64(username + ":" + password)}"
end

def relay(source)
  case response = post(source)
  when Net::HTTPSuccess
    Result.new "2.0.0 Successfully relayed message to Postfix ingress"
  when Net::HTTPUnauthorized
    Result.new "4.7.0 Invalid credentials for Postfix ingress"
  else
    Result.new "4.0.0 HTTP #{response.code}"
  end
rescue IOError, SocketError, SystemCallError => error
  Result.new "4.4.2 Network error relaying to Postfix ingress: #{error.message}"
rescue Timeout::Error
  Result.new "4.4.2 Timed out relaying to Postfix ingress"
rescue => error
  Result.new "4.0.0 Error relaying to Postfix ingress: #{error.message}"
end