discourse/app/controllers/stylesheets_controller.rb

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class StylesheetsController < ApplicationController
skip_before_filter :preload_json, :redirect_to_login_if_required, :check_xhr, :verify_authenticity_token, only: [:show]
def show
target,digest = params[:name].split("_")
digest_orig = digest
digest = "_" + digest if digest
# Security note, safe due to route constraint
location = "#{Rails.root}/#{DiscourseStylesheets::CACHE_PATH}/#{target}#{digest}.css"
unless File.exist?(location)
query = StylesheetCache.where(target: target)
if digest
query = query.where(digest: digest_orig)
else
query = query.order('id desc')
end
if current = query.first
File.write(location, current.content)
else
return render nothing: true, status: 404
end
end
expires_in 1.year, public: true unless Rails.env == "development"
send_file(location, disposition: :inline)
end
end