class Apartment::Elevators::Subdomain


Assumes that database name should match subdomain
Provides a rack based db switching solution based on subdomains

def self.excluded_subdomains 

def self.excluded_subdomains
  @@excluded_subdomains ||= []
end

def self.excluded_subdomains=(arg) 

def self.excluded_subdomains=(arg)
  @@excluded_subdomains = arg
end

def named_host?(host) 

def named_host?(host)
  !(host.nil? || /\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$/.match(host))
end

def parse_database_name(request) 

def parse_database_name(request)
  request_subdomain = subdomain(request.host)
  # If the domain acquired is set to be exlcluded, set the database to whatever is currently
  # next in line in the schema search path.
  database = if self.class.excluded_subdomains.include?(request_subdomain)
    nil
  else
    request_subdomain
  end
  database.present? && database || nil
end

def subdomain(host)

Only care about the first subdomain for the database name 
def subdomain(host)
  subdomains(host).first
end

def subdomains(host, tld_length = 1)

Assuming tld_length of 1, might need to make this configurable in Apartment in the future for things like .co.uk 
def subdomains(host, tld_length = 1)
  return [] unless named_host?(host)
  host.split('.')[0..-(tld_length + 2)]
end