2 files changed, 38 insertions, 0 deletions
diff --git a/actionpack/lib/action_dispatch/http/filter_redirect.rb b/actionpack/lib/action_dispatch/http/filter_redirect.rb
new file mode 100644
index 0000000000..900ce1c646
--- /dev/null
+++ b/actionpack/lib/action_dispatch/http/filter_redirect.rb
@@ -0,0 +1,37 @@
+module ActionDispatch
+  module Http
+    module FilterRedirect
+
+      FILTERED = '[FILTERED]'.freeze # :nodoc:
+
+      def filtered_location
+        if !location_filter.empty? && location_filter_match?
+          FILTERED
+        else
+          location
+        end
+      end
+
+    private
+
+      def location_filter
+        if request.present?
+          request.env['action_dispatch.redirect_filter'] || []
+        else
+          []
+        end
+      end
+
+      def location_filter_match?
+        location_filter.any? do |filter|
+          if String === filter
+            location.include?(filter)
+          elsif Regexp === filter
+            location.match(filter)
+          end
+        end
+      end
+
+    end
+  end
+end
diff --git a/actionpack/lib/action_dispatch/http/response.rb b/actionpack/lib/action_dispatch/http/response.rb
index 11b7534ea4..0f808ac9cf 100644
--- a/actionpack/lib/action_dispatch/http/response.rb
+++ b/actionpack/lib/action_dispatch/http/response.rb
@@ -61,6 +61,7 @@ module ActionDispatch # :nodoc:
     cattr_accessor(:default_headers)
 
     include Rack::Response::Helpers
+    include ActionDispatch::Http::FilterRedirect
     include ActionDispatch::Http::Cache::Response
     include MonitorMixin