Class: MonoVM::Whois::Availability::Rules::Recordless

Inherits:
MonoVM::Whois::Availability::Rule show all
Defined in:
lib/monovm/whois/availability/rules/recordless.rb

Overview

Last resort: the server answered with its banner and nothing else.

A few registries — NIC Monaco among them — reply to an unregistered name with no marker at all, just their header. For those, silence genuinely is the signal, and no other rule can help.

Inferring availability from absence is unsound in general, so this rule is off unless a TLD definition sets available_when_empty, and even then it refuses to answer if the response looks like anything other than a clean empty reply: no registration fields, no refusal, no error or restriction notice. Opt-in per TLD rather than a global fallback is the difference between handling one registry's quirk and reporting every unreadable response as free to register.

Constant Summary collapse

MAX_FIELDS =

Below two registration fields the response is not a record. At two or more it is, however terse.

2

Instance Method Summary collapse

Methods inherited from MonoVM::Whois::Availability::Rule

#name

Instance Method Details

#call(context) ⇒ Object 



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# File 'lib/monovm/whois/availability/rules/recordless.rb', line 27

def call(context)
  return nil unless context.definition&.available_when_empty?
  return nil if context.empty?
  return nil if context.match?(Patterns::ERROR_OR_RESTRICTION, source: :significant)

  fields = context.count(Patterns::REGISTRATION_FIELDS, source: :significant)
  return nil if fields >= MAX_FIELDS

  available(
    reason: "#{context.tld} answers unregistered names with no record, " \
            "and this response carries none",
    evidence: context.preview(80)
  )
end