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

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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
This commit is contained in:
evazion
2021-12-09 19:52:02 -06:00
parent 7dbde7bc14
commit 52013eac1f
5 changed files with 28 additions and 13 deletions
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5
app/logical/current_user.rb
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@@ -1,5 +1,6 @@
# A global variable containing the current user, the current IP address, the
# current user's country code, and whether safe mode is enabled.
# current user's country code, whether safe mode is enabled, and whether
# save-data mode is enabled.
#
# The current user is set during a request by {ApplicationController#set_current_user},
# which calls {SessionLoader#load}. The current user will not be set outside of
@@ -11,7 +12,7 @@
# @see ApplicationController#set_current_user
# @see SessionLoader#load
class CurrentUser < ActiveSupport::CurrentAttributes
attribute :user, :ip_addr, :country, :safe_mode
attribute :user, :ip_addr, :country, :safe_mode, :save_data
alias_method :safe_mode?, :safe_mode
delegate :id, to: :user, allow_nil: true