# frozen_string_literal: true

module DnsHelpers
  def block_dns!
    stub_all_dns!
    stub_invalid_dns!
    permit_local_dns!
  end

  def permit_dns!
    allow(Addrinfo).to receive(:getaddrinfo).and_call_original
  end

  def stub_all_dns!
    allow(Addrinfo).to receive(:getaddrinfo).with(anything, anything, nil, :STREAM).and_return([])
    allow(Addrinfo).to receive(:getaddrinfo).with(anything, anything, nil, :STREAM, anything, anything).and_return([])
  end

  def stub_invalid_dns!
    allow(Addrinfo).to receive(:getaddrinfo).with(/\Afoobar\.\w|(\d{1,3}\.){4,}\d{1,3}\z/i, anything, nil, :STREAM) do
      raise SocketError.new("getaddrinfo: Name or service not known")
    end
  end

  def permit_local_dns!
    local_addresses = /\A(127|10)\.0\.0\.\d{1,3}|(192\.168|172\.16)\.\d{1,3}\.\d{1,3}|0\.0\.0\.0|localhost\z/i
    allow(Addrinfo).to receive(:getaddrinfo).with(local_addresses, anything, nil, :STREAM).and_call_original
    allow(Addrinfo).to receive(:getaddrinfo).with(local_addresses, anything, nil, :STREAM, anything, anything, any_args).and_call_original
  end
end