readded convert generator/processor but just as deprecation errors

lib/dragonfly/image_magick/plugin.rb

@@ -57,6 +57,9 @@ def call(app, opts = {})
         app.add_generator :plain, ImageMagick::Generators::Plain.new
         app.add_generator :plasma, ImageMagick::Generators::Plasma.new
         app.add_generator :text, ImageMagick::Generators::Text.new
+        app.add_generator :convert do
+          raise "The convert generator is deprecated for better security - use Dragonfly::ImageMagick::Commands.generate(content, args, format) instead."
+        end
 
         # Processors
         app.add_processor :encode, Processors::Encode.new
@@ -65,6 +68,9 @@ def call(app, opts = {})
           ParamValidators.validate!(amount, &ParamValidators.is_number)
           Commands.convert(content, "-rotate #{amount}")
         end
+        app.add_processor :convert do
+          raise "The convert processor is deprecated for better security - use Dragonfly::ImageMagick::Commands.convert(content, args, opts) instead."
+        end
 
         # Extra methods
         app.define :identify do |cli_args = nil|

spec/dragonfly/image_magick/plugin_spec.rb

@@ -131,4 +131,18 @@
       image.identify("-format %h").chomp.should == "355"
     end
   end
+
+  describe "deprecated convert commands" do
+    it "raises a deprecated message if using the convert processor" do
+      expect {
+        image.convert!("into something").apply
+      }.to raise_error(/deprecated/i)
+    end
+
+    it "raises a deprecated message if using the convert generator" do
+      expect {
+        image.generate!(:convert, "into something").apply
+      }.to raise_error(/deprecated/i)
+    end
+  end
 end