# frozen_string_literal: true

# Custom patch to temporarily maintain 2.7.x support

module OpenTelemetry
  module Common
    module Propagation
      # The RackEnvGetter class provides a common methods for reading
      # keys from a rack environment. It abstracts away the rack-normalization
      # process so that keys can be looked up without having to transform them
      # first. With this class you can get +traceparent+ instead of
      # +HTTP_TRACEPARENT+
      class RackEnvGetter

        private

        def to_rack_key(key)
          ret = "HTTP_#{key}"
          ret = ret.tr('-', '_')
          ret = ret.upcase
          ret
        end

        def from_rack_key(key)
          start = key.start_with?('HTTP_') ? 5 : 0
          ret = key[start..]
          ret = ret.tr('_', '-')
          ret = ret.downcase!
          ret
        end
      end
    end
  end
end