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# frozen_string_literal: true
#
# domain_name.rb - Domain Name manipulation library for Ruby
#
# Copyright (C) 2011-2017 Akinori MUSHA, All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.
require "ipaddr"
module HTTPX
# Represents a domain name ready for extracting its registered domain
# and TLD.
class DomainName
include Comparable
# The full host name normalized, ASCII-ized and downcased using the
# Unicode NFC rules and the Punycode algorithm. If initialized with
# an IP address, the string representation of the IP address
# suitable for opening a connection to.
attr_reader :hostname
# The Unicode representation of the #hostname property.
#
# :attr_reader: hostname_idn
# The least "universally original" domain part of this domain name.
# For example, "example.co.uk" for "www.sub.example.co.uk". This
# may be nil if the hostname does not have one, like when it is an
# IP address, an effective TLD or higher itself, or of a
# non-canonical domain.
attr_reader :domain
class << self
def new(domain)
return domain if domain.is_a?(self)
super
end
# Normalizes a _domain_ using the Punycode algorithm as necessary.
# The result will be a downcased, ASCII-only string.
def normalize(domain)
unless domain.ascii_only?
domain = domain.chomp(".").unicode_normalize(:nfc)
domain = Punycode.encode_hostname(domain)
end
domain.downcase
end
end
# Parses _hostname_ into a DomainName object. An IP address is also
# accepted. An IPv6 address may be enclosed in square brackets.
def initialize(hostname)
hostname = String(hostname)
raise ArgumentError, "domain name must not start with a dot: #{hostname}" if hostname.start_with?(".")
begin
@ipaddr = IPAddr.new(hostname)
@hostname = @ipaddr.to_s
return
rescue IPAddr::Error
nil
end
@hostname = DomainName.normalize(hostname)
tld = if (last_dot = @hostname.rindex("."))
@hostname[(last_dot + 1)..-1]
else
@hostname
end
# unknown/local TLD
@domain = if last_dot
# fallback - accept cookies down to second level
# cf. http://www.dkim-reputation.org/regdom-libs/
if (penultimate_dot = @hostname.rindex(".", last_dot - 1))
@hostname[(penultimate_dot + 1)..-1]
else
@hostname
end
else
# no domain part - must be a local hostname
tld
end
end
# Checks if the server represented by this domain is qualified to
# send and receive cookies with a domain attribute value of
# _domain_. A true value given as the second argument represents
# cookies without a domain attribute value, in which case only
# hostname equality is checked.
def cookie_domain?(domain, host_only = false)
# RFC 6265 #5.3
# When the user agent "receives a cookie":
return self == @domain if host_only
domain = DomainName.new(domain)
# RFC 6265 #5.1.3
# Do not perform subdomain matching against IP addresses.
@hostname == domain.hostname if @ipaddr
# RFC 6265 #4.1.1
# Domain-value must be a subdomain.
@domain && self <= domain && domain <= @domain
end
def <=>(other)
other = DomainName.new(other)
othername = other.hostname
if othername == @hostname
0
elsif @hostname.end_with?(othername) && @hostname[-othername.size - 1, 1] == "."
# The other is higher
-1
else
# The other is lower
1
end
end
end
end
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