Request#filter_parameters and filter_env

actionpack/lib/action_dispatch/http/parameters.rb

@@ -29,9 +29,31 @@ def symbolized_path_parameters
       def path_parameters
         @env["action_dispatch.request.path_parameters"] ||= {}
       end
-  
-    private
 
+      def filter_parameters
+        # TODO: Remove dependency on controller
+        if controller = @env['action_controller.instance']
+          controller.send(:filter_parameters, params)
+        else
+          params
+        end
+      end
+
+      def filter_env
+        if controller = @env['action_controller.instance']
+          @env.map do |key, value|
+            if (key =~ /RAW_POST_DATA/i)
+              '[FILTERED]'
+            else
+              controller.send(:filter_parameters, {key => value}).values[0]
+            end
+          end
+        else
+          env
+        end
+      end
+
+    private
       # Convert nested Hashs to HashWithIndifferentAccess
       def normalize_parameters(value)
         case value