s3 presign 用に作ったけど aws-sdk-s3 が内部で uri encode するので事前に encode してはダメだったと判明し供養

http_util.rb

module HttpUtil
  class PathSegment < String
    MATCHER = Regexp.new("\\A#{URI::RFC3986_Parser::SEG_NC}+\\Z")
    def self.encode_from(str, allow_slash: false)
      return str if str.is_a?(PathSegment)
      raise 'should not include / in element or use allow_slash option to encode' if !allow_slash && str.include?('/')
      new(URI.encode_uri_component(str.unicode_normalize(:nfkc)))
    end
    def initialize(str)
      raise "invalid char: #{str}" unless MATCHER.match?(str)
      super.freeze
    end
    def decode
      URI.decode_uri_component(self)
    end
  end

  class Path < Array
    def self.build(str_or_arr, allow_slash: false)
      case str_or_arr
      when Path
        str_or_arr
      when String
        build(str_or_arr.split('/'))
      when Array
        raise 'should not include blank path segment' if str_or_arr.any?(&:blank?)
        Path[*str_or_arr.map { PathSegment.encode_from(_1, allow_slash:) }].freeze
      else
        raise 'invalid type'
      end
    end
    def to_s
      join('/')
    end
  end

  module_function

  def content_disposition_value(type, filename)
    raise 'type should be attachment or inline' unless type.in? %i[attachment inline]

    encoded = PathSegment.encode_from(filename)
    "#{type}; filename*=UTF-8''#{encoded.decode}"
  end
end