close #61 implement dnsbl

app/models/blacklisted_domain.rb

@@ -1,8 +1,12 @@
 class BlacklistedDomain < ActiveRecord::Base
   # attr_accessible :name
   
-  def self.include?(name)
+  scope :of, ->(domain_name) {
     where("blacklisted_domains.name = ? OR ? LIKE CONCAT('%.', blacklisted_domains.name)",
-      name, name).exists?
+      domain_name, domain_name)
+  }
+  
+  def self.include?(domain_name)
+    of(domain_name).exists? || Dnsbl.include?(domain_name)
   end
 end

config/application.rb

@@ -15,6 +15,7 @@ module Entrydns
     config.autoload_paths += %W(
       #{config.root}/app/controllers/concerns
       #{config.root}/app/models/concerns
+      #{config.root}/lib
     )
 
     # Only load the plugins named here, in the order given (default is alphabetical).

lib/dnsbl.rb

@@ -0,0 +1,15 @@
+class Dnsbl
+  PROVIDER = '.in.dnsbl.org'
+  @dns = Resolv::DNS.new
+  
+  def self.include?(domain_name)
+    query(domain_name) != nil
+  end
+  
+  def self.query(domain_name)
+    @dns.getresource(domain_name + PROVIDER, Resolv::DNS::Resource::IN::A)
+  rescue Resolv::ResolvError
+    nil
+  end
+  
+end

spec/lib/dnsbl_spec.rb

@@ -0,0 +1,15 @@
+require 'spec_helper'
+
+describe Dnsbl do
+  include_context "data"
+
+  it "queries correctly" do
+    Dnsbl.query('does-not-exist-domain-1234567890.net') == nil
+  end
+  
+  it "distinguishes bad domains from good ones" do
+    Dnsbl.include?('place4porn.net').should == true
+    Dnsbl.include?('entrydns.net').should == false
+  end
+  
+end

spec/models/blacklisted_domain_spec.rb

@@ -7,6 +7,7 @@ describe BlacklistedDomain do
     blacklisted_domain
     BlacklistedDomain.should include(blacklisted_domain.name)
     BlacklistedDomain.should include("sub.#{blacklisted_domain.name}")
+    BlacklistedDomain.should include("place4porn.net")
     BlacklistedDomain.should_not include(FactoryGirl.generate(:domain_name))
   end
 end