allow Applebot to masquerade as Googlebot [closes #6]

https://support.apple.com/en-us/HT204683

lib/legitbot/apple.rb

@@ -12,5 +12,9 @@ def valid?
     end
   end
 
+  class Apple_as_Google < Apple
+  end
+
   rule Legitbot::Apple, %w(Applebot)
+  rule Legitbot::Apple_as_Google, %w(Googlebot)
 end

lib/legitbot/legitbot.rb

@@ -11,12 +11,15 @@ module Legitbot
   # :yields: a found bot
   #
   def self.bot(userAgent, ip, resolver_config = nil)
-    bot =
+    bots =
       @rules.select { |rule|
         rule[:fragments].any? {|f| userAgent.index f}
       }.map { |rule|
         rule[:class].new(ip, resolver_config)
-      }.first
+      }
+
+    bot = bots.select { |bot| bot.valid? }.first if bots.size > 1
+    bot = bots.first if bot.nil?
 
     if bot && block_given?
       yield bot

test/apple_as_google_test.rb

@@ -0,0 +1,22 @@
+require 'minitest/autorun'
+require 'legitbot'
+
+class AppleAsGoogleTest < Minitest::Test
+  def test_valid_ip
+    ip = "17.58.98.60"
+    match = Legitbot::Apple_as_Google.new(ip)
+    assert match.valid?, msg: "#{ip} is a valid Applebot IP"
+  end
+
+  def test_invalid_ip
+    ip = "127.0.0.1"
+    match = Legitbot::Apple_as_Google.new(ip)
+    assert match.fake?, msg: "#{ip} is a fake Applebot IP"
+  end
+
+  def test_user_agent
+    bot = Legitbot.bot("Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)", "17.58.98.60")
+    assert_equal :apple_as_google, bot.detected_as
+    assert bot.valid?, msg: "A valid Applebot User-agent and IP"
+  end
+end