class DomainName

Represents a domain name ready for extracting its registered domain and TLD.

Constants

ETLD_DATA
ETLD_DATA_DATE
VERSION

Attributes

domain[R]

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.

domain_idn[R]

The Unicode representation of the domain property.

hostname[R]

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.

hostname_idn[R]

The Unicode representation of the hostname property.

idn[R]

The Unicode representation of the hostname property.

ipaddr[R]

Returns an IPAddr object if this is an IP address.

tld[R]

The TLD part of this domain name. For example, if the hostname is “www.sub.example.co.uk”, the TLD part is “uk”. This property is nil only if ipaddr? is true. This may be nil if the hostname does not have one, like when it is an IP address or of a non-canonical domain.

tld_idn[R]

The Unicode representation of the tld property.

uri_host[R]

Returns a host name representation suitable for use in the host name part of a URI. A host name, an IPv4 address, or a IPv6 address enclosed in square brackets.

Public Class Methods

etld_data() click to toggle source

# File lib/domain_name/etld_data.rb, line 7872
def self.etld_data
  ETLD_DATA
end

new(hostname) click to toggle source

Parses hostname into a DomainName object. An IP address is also accepted. An IPv6 address may be enclosed in square brackets.

# File lib/domain_name.rb, line 77
def initialize(hostname)
  hostname.is_a?(String) or
    (hostname.respond_to?(:to_str) && (hostname = hostname.to_str).is_a?(String)) or
    raise TypeError, "#{hostname.class} is not a String"
  if hostname.start_with?(DOT)
    raise ArgumentError, "domain name must not start with a dot: #{hostname}"
  end
  case hostname
  when /\A([0-9]+\.[0-9]+\.[0-9]+\.[0-9]+)\z/
    @ipaddr = IPAddr.new($1)
    @uri_host = @hostname = @ipaddr.to_s
    @domain = @tld = nil
    return
  when /\A([0-9A-Fa-f:]*:[0-9A-Fa-f:]*:[0-9A-Fa-f:]*)\z/,
    /\A\[([0-9A-Fa-f:]*:[0-9A-Fa-f:]*:[0-9A-Fa-f:]*)\]\z/
    @ipaddr = IPAddr.new($1)
    @hostname = @ipaddr.to_s
    @uri_host = "[#{@hostname}]"
    @domain = @tld = nil
    return
  end
  @ipaddr = nil
  @hostname = DomainName.normalize(hostname)
  @uri_host = @hostname
  if last_dot = @hostname.rindex(DOT)
    @tld = @hostname[(last_dot + 1)..-1]
  else
    @tld = @hostname
  end
  etld_data = DomainName.etld_data
  if @canonical_tld_p = etld_data.key?(@tld)
    subdomain = domain = nil
    parent = @hostname
    loop {
      case etld_data[parent]
      when 0
        @domain = domain if domain
        return
      when -1
        @domain = subdomain if subdomain
        return
      when 1
        @domain = parent
        return
      end
      subdomain = domain
      domain = parent
      pos = @hostname.index(DOT, -domain.length) or break
      parent = @hostname[(pos + 1)..-1]
    }
  else
    # unknown/local TLD
    if last_dot
      # fallback - accept cookies down to second level
      # cf. http://www.dkim-reputation.org/regdom-libs/
      if penultimate_dot = @hostname.rindex(DOT, last_dot - 1)
        @domain = @hostname[(penultimate_dot + 1)..-1]
      else
        @domain = @hostname
      end
    else
      # no domain part - must be a local hostname
      @domain = @tld
    end
  end
end

normalize(domain) click to toggle source

Normalizes a domain using the Punycode algorithm as necessary. The result will be a downcased, ASCII-only string.

# File lib/domain_name.rb, line 287
def normalize(domain)
  DomainName::Punycode.encode_hostname(domain.chomp(DOT).to_nfc).downcase
end

Public Instance Methods

<(other) click to toggle source

# File lib/domain_name.rb, line 194
def <(other)
  case self <=> other
  when -1
    true
  when nil
    nil
  else
    false
  end
end

<=(other) click to toggle source

# File lib/domain_name.rb, line 216
def <=(other)
  case self <=> other
  when -1, 0
    true
  when nil
    nil
  else
    false
  end
end

<=>(other) click to toggle source

# File lib/domain_name.rb, line 178
def <=>(other)
  other = DomainName.new(other) unless DomainName === other
  othername = other.hostname
  if othername == @hostname
    0
  elsif @hostname.end_with?(othername) && @hostname[-othername.size - 1, 1] == DOT
    # The other is higher
    -1
  elsif othername.end_with?(@hostname) && othername[-@hostname.size - 1, 1] == DOT
    # The other is lower
    1
  else
    nil
  end
end

==(other) click to toggle source

# File lib/domain_name.rb, line 173
def ==(other)
  other = DomainName.new(other) unless DomainName === other
  other.hostname == @hostname
end

>(other) click to toggle source

# File lib/domain_name.rb, line 205
def >(other)
  case self <=> other
  when 1
    true
  when nil
    nil
  else
    false
  end
end

>=(other) click to toggle source

# File lib/domain_name.rb, line 227
def >=(other)
  case self <=> other
  when 1, 0
    true
  when nil
    nil
  else
    false
  end
end

canonical?() click to toggle source

Returns true if this domain name has a canonical registered domain.

# File lib/domain_name.rb, line 69
def canonical?
  @canonical_tld_p && (@domain ? true : false)
end

canonical_tld?() click to toggle source

Returns true if this domain name has a canonical TLD.

# File lib/domain_name.rb, line 63
def canonical_tld?
  @canonical_tld_p
end

cookie_domain?(domain, host_only = false) click to toggle source

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.

# File lib/domain_name.rb, line 149
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) unless DomainName === domain
  if ipaddr?
    # RFC 6265 #5.1.3
    # Do not perform subdomain matching against IP addresses.
    @hostname == domain.hostname
  else
    # RFC 6265 #4.1.1
    # Domain-value must be a subdomain.
    @domain && self <= domain && domain <= @domain ? true : false
  end
end

inspect() click to toggle source

# File lib/domain_name.rb, line 273
def inspect
  str = '#<%s:%s' % [self.class.name, @hostname]
  if @ipaddr
    str << ' (ipaddr)'
  else
    str << ' domain=' << @domain if @domain
    str << ' tld=' << @tld if @tld
  end
  str << '>'
end

ipaddr?() click to toggle source

Returns true if this is an IP address, such as “192.168.0.1” and “[::1]”.

# File lib/domain_name.rb, line 53
def ipaddr?
  @ipaddr ? true : false
end

superdomain() click to toggle source

Returns the superdomain of this domain name.

# File lib/domain_name.rb, line 167
def superdomain
  return nil if ipaddr?
  pos = @hostname.index(DOT) or return nil
  self.class.new(@hostname[(pos + 1)..-1])
end

to_s() click to toggle source

# File lib/domain_name.rb, line 238
def to_s
  @hostname
end

Also aliased as: to_str

to_str()

Alias for: to_s