posts: use low quality thumbnails when Save-Data header is set.

When the Save-Data HTTP header is present, disable high quality (2x pixel density) thumbnails. This is normally set when "Data Saver mode" is enabled on Android, or "Lite mode" is enabled in Chrome. This setting can also be set using the `save_data` URL param or HTTP cookie. This is mainly for testing. The <body> tag has a `current-user-save-data` data attribute that indicates whether save data mode is on. https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Save-Data https://developers.google.com/web/fundamentals/performance/optimizing-content-efficiency/save-data/#the_save-data_request_header https://source.android.com/devices/tech/connect/data-saver
2021-12-09 19:52:02 -06:00
parent 7dbde7bc14
commit 52013eac1f
5 changed files with 28 additions and 13 deletions
--- a/app/helpers/application_helper.rb
+++ b/app/helpers/application_helper.rb
@@ -252,7 +252,7 @@ module ApplicationHelper
    render "table_builder/table", table: table
  end

-  def body_attributes(user, params, current_item = nil)
+  def body_attributes(current_user, params, current_item = nil)
    controller_param = params[:controller].parameterize.dasherize
    action_param = params[:action].parameterize.dasherize

@@ -265,7 +265,8 @@ module ApplicationHelper
        action: action_param,
        layout: controller.class.send(:_layout),
        "current-user-ip-addr": request.remote_ip,
-        **current_user_data_attributes(user),
+        "current-user-save-data": CurrentUser.save_data,
+        **current_user_data_attributes(current_user),
        **cookie_data_attributes,
        **current_item_data_attributes(current_item),
      }