lib/mongoid/kms/mock.rb in mongoid-kms-0.1.2 vs lib/mongoid/kms/mock.rb in mongoid-kms-0.1.3

@@ -1,16 +1,31 @@
 require 'mongoid/kms'
-require 'rot13'
 
 module Mongoid
   module Kms
     module ClassMethods
       def encrypt_field(object, field_name, value)
         Rot13.rotate(value, 13)
       end
 
       def decrypt_field(object, field_name, data, encryption_context = nil)
         Rot13.rotate(data, -13)
+      end
+    end
+
+    # inline Rot13 gem, as seen in
+    # https://github.com/jrobertson/rot13/blob/012c9c37d767a364f793db00890dee82d9a65732/lib/rot13.rb
+    # so we don't add unnecessary dependencies
+    class Rot13
+      def self.rotate(s,deg=13)
+        a = ('a'..'z').map.with_index{|x,i| [x.chr,i] }
+
+        r = s.split(//).map do |x|
+          item = a.assoc(x.downcase)
+          c = item ? a.rotate(deg)[item.last].first : x
+          x == x.downcase ? c : c.upcase
+        end
+        r.join
       end
     end
   end
 end