module WebAgent::CookieUtils

def domain_match(host, domain)
  return false if domain.nil?
  domainname = domain.sub(/\.\z/, '').downcase
  hostname = host.sub(/\.\z/, '').downcase
  case domain
  when /\d+\.\d+\.\d+\.\d+/
    return (hostname == domainname)
  when '.'
    return true
  when /^\./
    # allows; host == rubyforge.org, domain == .rubyforge.org
    return tail_match?(domainname, '.' + hostname)
  else
    return (hostname == domainname)
  end
end

def head_match?(str1, str2)
  str1 == str2[0, str1.length]
end

def tail_match?(str1, str2)
  if str1.length > 0
    str1 == str2[-str1.length..-1].to_s
  else
    true
  end
end