discourse/app/controllers/site_customizations_control...

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class SiteCustomizationsController < ApplicationController
skip_before_filter :preload_json, :check_xhr, :redirect_to_login_if_required
def show
no_cookies
cache_time = request.env["HTTP_IF_MODIFIED_SINCE"]
cache_time = Time.rfc2822(cache_time) rescue nil if cache_time
stylesheet_time =
begin
if params[:key].to_s == SiteCustomization::ENABLED_KEY
SiteCustomization.where(enabled: true)
.order('created_at desc')
.limit(1)
.pluck(:created_at)
.first
else
SiteCustomization.where(key: params[:key].to_s).pluck(:created_at).first
end
end
if !stylesheet_time
raise Discourse::NotFound
end
if cache_time && stylesheet_time <= cache_time
return render nothing: true, status: 304
end
response.headers["Last-Modified"] = stylesheet_time.httpdate
expires_in 1.year, public: true
render text: SiteCustomization.stylesheet_contents(params[:key], params[:target]),
content_type: "text/css"
end
end