Patch for param parsing to check for encoded latin-1 URL parameters

gistfile1.rb

  #
  # Source: https://rails.lighthouseapp.com/projects/8994/tickets/2188-i18n-fails-with-multibyte-strings-in-ruby-19-similar-to-2038
  # (fix_params.rb)

  module ActionController
    class Request
      private

        def check_string_encoding(str)
          str.valid_encoding? ? str : str.force_encoding("iso-8859-1").encode("utf-8")
        end

        # Convert nested Hashs to HashWithIndifferentAccess and replace
        # file upload hashs with UploadedFile objects
        def normalize_parameters(value)
          case value
          when Hash
            if value.has_key?(:tempfile)
              upload = value[:tempfile]
              upload.extend(UploadedFile)
              upload.original_path = value[:filename]
              upload.content_type = value[:type]
              upload
            else
              h = {}
              value.each { |k, v| h[k] = normalize_parameters(v) }
              h.with_indifferent_access
            end
          when Array
            value.map { |e| normalize_parameters(e) }
          else
            value.force_encoding(Encoding::UTF_8)
            check_string_encoding(value)
          end
        end
    end
  end