app/models/soa.rb
# See #SOA
# = Start of Authority Record
# Defined in RFC 1035. The SOA defines global parameters for the zone (domain).
# There is only one SOA record allowed in a zone file.
#
# Obtained from http://www.zytrax.com/books/dns/ch8/soa.html
#
class SOA < Record
validates_presence_of :primary_ns, :content, :serial, :refresh, :retry,
:expire, :minimum
validates_numericality_of :serial, :refresh, :retry, :expire,
:allow_blank => true,
:greater_than_or_equal_to => 0
validates_numericality_of :minimum, # RFC2308
:allow_blank => true,
:greater_than_or_equal_to => 0,
:less_than_or_equal_to => 10800
validates_uniqueness_of :domain_id
validates_format_of :contact, :with => /\A[^@\s]+@([^@\s]+\.)+[^@\s]+\z/
validates :name, :presence => true, :hostname => true
before_validation :set_content
before_update :update_serial
after_initialize :update_convenience_accessors
# The portions of the +content+ column that make up our SOA fields
SOA_FIELDS = %w{ primary_ns contact serial refresh retry expire minimum }
# This allows us to have these convenience attributes act like any other
# column in terms of validations
SOA_FIELDS.each do |soa_entry|
attr_accessor soa_entry
define_method "#{soa_entry}_before_type_cast" do
instance_variable_get("@#{soa_entry}")
end
end
# Treat contact specially, replacing the first period with an @ if
# no @'s are present
def contact=( email )
if !email.nil? && email.index('@').nil?
email.sub!('.', '@')
end
@contact = email
end
# Hook into #reload
def reload_with_content
reload_without_content
update_convenience_accessors
end
alias_method_chain :reload, :content
# Updates the serial number to the next logical one. Format of the generated
# serial is YYYYMMDDNN, where NN is the number of the change for the day.
# 01 for the first change, 02 the seconds, etc...
#
# If the serial number is 0, we opt for PowerDNS's automatic serial number
# generation
def update_serial
unless Record.batch_soa_updates.nil?
if Record.batch_soa_updates.include?( self.id )
return
end
Record.batch_soa_updates << self.id
end
return if self.content_changed?
date_serial = Time.now.strftime( "%Y%m%d00" ).to_i
self.serial = if self.serial.nil? || date_serial > self.serial
date_serial
else
self.serial + 1
end
end
# Same as #update_serial and saves the record
def update_serial!
if respond_to?( :without_auditing )
without_auditing do
update_serial
save
end
else
update_serial
save
end
end
# Nicer representation of the domain as XML
def to_xml(options = {}, &block)
to_xml_without_cleanup options.merge(:methods => SOA_FIELDS)
end
def set_content
self.content = SOA_FIELDS.map { |f| instance_variable_get("@#{f}").to_s }.join(' ')
end
private
# Update our convenience accessors when the object has changed
def update_convenience_accessors
# Setup our convenience values
@primary_ns, @contact, @serial, @refresh, @retry, @expire, @minimum =
self[:content].split(/\s+/) unless self[:content].blank?
%w{ serial refresh retry expire minimum }.each do |i|
value = instance_variable_get("@#{i}")
value = value.to_i unless value.nil?
send("#{i}=", value )
end
update_serial if @serial.nil? || @serial.zero?
end
end