1 files changed, 37 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..8c4e852235
--- /dev/null
+++ b/actionpack/lib/action_dispatch/http/filter_redirect.rb
@@ -0,0 +1,37 @@
+# frozen_string_literal: true
+
+module ActionDispatch
+  module Http
+    module FilterRedirect
+      FILTERED = "[FILTERED]" # :nodoc:
+
+      def filtered_location # :nodoc:
+        if location_filter_match?
+          FILTERED
+        else
+          location
+        end
+      end
+
+    private
+
+      def location_filters
+        if request
+          request.get_header("action_dispatch.redirect_filter") || []
+        else
+          []
+        end
+      end
+
+      def location_filter_match?
+        location_filters.any? do |filter|
+          if String === filter
+            location.include?(filter)
+          elsif Regexp === filter
+            location =~ filter
+          end
+        end
+      end
+    end
+  end
+end