[txt-records] Initial basic version with direct URLs

Gemfile

@@ -1,7 +1,7 @@
 source "https://rubygems.org"
 
 gem 'sinatra'
-
+gem 'dnsruby'
 group :test do
   gem 'minitest'
   gem 'mina'

Gemfile.lock

@@ -1,35 +1,37 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    daemons (1.2.3)
-    eventmachine (1.0.8)
-    mina (0.3.7)
+    daemons (1.2.4)
+    dnsruby (1.60.0)
+    eventmachine (1.2.1)
+    mina (1.0.3)
       open4 (~> 1.3.4)
       rake
-    minitest (5.7.0)
+    minitest (5.10.1)
     open4 (1.3.4)
-    rack (1.6.4)
+    rack (1.6.5)
     rack-protection (1.5.3)
       rack
-    rake (10.4.2)
-    sinatra (1.4.6)
-      rack (~> 1.4)
+    rake (11.3.0)
+    sinatra (1.4.7)
+      rack (~> 1.5)
       rack-protection (~> 1.4)
       tilt (>= 1.3, < 3)
-    thin (1.6.3)
+    thin (1.7.0)
       daemons (~> 1.0, >= 1.0.9)
-      eventmachine (~> 1.0)
-      rack (~> 1.0)
-    tilt (2.0.1)
+      eventmachine (~> 1.0, >= 1.0.4)
+      rack (>= 1, < 3)
+    tilt (2.0.5)
 
 PLATFORMS
   ruby
 
 DEPENDENCIES
+  dnsruby
   mina
   minitest
   sinatra
   thin
 
 BUNDLED WITH
-   1.10.5
+   1.13.6

lightsaber.rb

@@ -1,5 +1,7 @@
+require 'rubygems'
 require 'uri'
 require 'rack/response'
+require 'dnsruby'
 
 # This is the class that resolves a given URL
 # to what we need to redirect to
@@ -17,21 +19,31 @@ class Lightsaber
     end
   end
 
-  def get_response_from_yml
-    res = Rack::Response.new
+  def get_response_from_dns (host)
 
-    YAML::load_file('redirects.yml').each do |code, zone|
-      if zone.has_key? @url.host.to_s
-        url = get_url(zone[@url.host], @url.path)
-        if url
-          res.redirect url, code
-        else
-          res.status = 400
-          res.body = "Invalid configuration for #{@url.host}"
+    res = not_setup_response
+
+    ret = Dnsruby::Resolver.new.query("_redirect.#{host}", 'TXT')
+    ret.answer.rrsets.each do |rrset|
+      rrset.rrs.each do |rr|
+        if is_valid_lightsaber_record? rr.data
+          url = get_redirect_from_dns_record rr.data
+          if url =~ /\A#{URI::regexp}\z/
+            res = Rack::Response.new
+            res.redirect url
+          end
         end
-        return res
       end
     end
+    res
+  end
+
+  def get_redirect_from_dns_record(data)
+    data[6..-1]
+  end
+
+  def is_valid_lightsaber_record? (data)
+    data[0..5] === 'v=lr1;'
   end
 
   def not_setup_response
@@ -42,10 +54,6 @@ class Lightsaber
 
 
   def get_response
-
-    yml_res = get_response_from_yml
-    return yml_res unless yml_res.nil?
-
-    not_setup_response
+    get_response_from_dns @url.host
   end
 end

redirects.yml

@@ -14,4 +14,4 @@
 302:
   fb.captnemo.in: https://facebook.com/captn3m0
   where.rzp.io: https://goo.gl/maps/1A9nhMPzehS2
-  where.razorpay.com: https://goo.gl/maps/1A9nhMPzehS2
+  where.razorpay.com: https://goo.gl/maps/1A9nhMPzehS2

test.rb

@@ -2,6 +2,7 @@ require 'minitest/autorun'
 require 'resolv'
 require 'yaml'
 require 'pp'
+require_relative './lightsaber'
 
 class TestConfig < Minitest::Test
   REDIRECTS = [301, 302]
@@ -15,6 +16,11 @@ class TestConfig < Minitest::Test
     end
   end
 
+  def test_txt_record
+    saber = Lightsaber.new 'http://localhost:9292/test'
+    pp saber.get_response_from_dns 'captnemo.in'
+  end
+
   def test_each_domain
     @config.each do |section, zone|
       zone.each do |domain, redirect|