1 files changed, 16 insertions, 5 deletions
diff --git a/actionpack/lib/action_dispatch/request/utils.rb b/actionpack/lib/action_dispatch/request/utils.rb
index 282bdbd2be..0ae464082d 100644
--- a/actionpack/lib/action_dispatch/request/utils.rb
+++ b/actionpack/lib/action_dispatch/request/utils.rb
@@ -1,8 +1,20 @@
+# frozen_string_literal: true
+
 module ActionDispatch
   class Request
     class Utils # :nodoc:
-      mattr_accessor :perform_deep_munge
-      self.perform_deep_munge = true
+      mattr_accessor :perform_deep_munge, default: true
+
+      def self.each_param_value(params, &block)
+        case params
+        when Array
+          params.each { |element| each_param_value(element, &block) }
+        when Hash
+          params.each_value { |value| each_param_value(value, &block) }
+        when String
+          block.call params
+        end
+      end
 
       def self.normalize_encode_params(params)
         if perform_deep_munge
@@ -22,14 +34,13 @@ module ActionDispatch
           unless params.valid_encoding?
             # Raise Rack::Utils::InvalidParameterError for consistency with Rack.
             # ActionDispatch::Request#GET will re-raise as a BadRequest error.
-            raise Rack::Utils::InvalidParameterError, "Non UTF-8 value: #{params}"
+            raise Rack::Utils::InvalidParameterError, "Invalid encoding for parameter: #{params.scrub}"
           end
         end
       end
 
       class ParamEncoder # :nodoc:
         # Convert nested Hash to HashWithIndifferentAccess.
-        #
         def self.normalize_encode_params(params)
           case params
           when Array
@@ -52,7 +63,7 @@ module ActionDispatch
         end
       end
 
-      # Remove nils from the params hash
+      # Remove nils from the params hash.
       class NoNilParamEncoder < ParamEncoder # :nodoc:
         def self.handle_array(params)
           list = super