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
no_cookies
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target,digest = params[:name].split(/_([a-f0-9]{40})/)
cache_time = request.env["HTTP_IF_MODIFIED_SINCE"]
cache_time = Time.rfc2822(cache_time) rescue nil if cache_time
query = StylesheetCache.where(target: target)
if digest
query = query.where(digest: digest)
else
query = query.order('id desc')
end
# Security note, safe due to route constraint
underscore_digest = digest ? "_" + digest : ""
location = "#{Rails.root}/#{DiscourseStylesheets::CACHE_PATH}/#{target}#{underscore_digest}.css"
stylesheet_time = query.pluck(:created_at).first
if !stylesheet_time
handle_missing_cache(location, target, digest)
end
if cache_time && stylesheet_time && stylesheet_time <= cache_time
return render nothing: true, status: 304
end
unless File.exist?(location)
if current = query.first
File.write(location, current.content)
else
raise Discourse::NotFound
end
end
response.headers['Last-Modified'] = stylesheet_time.httpdate if stylesheet_time
immutable_for(1.year) unless Rails.env == "development"
send_file(location, disposition: :inline)
end
protected
def handle_missing_cache(location, name, digest)
existing = File.read(location) rescue nil
if existing && digest
StylesheetCache.add(name, digest, existing)
end
end
end