discourse/app/controllers/stylesheets_controller.rb

109 lines
2.7 KiB
Ruby

# frozen_string_literal: true
class StylesheetsController < ApplicationController
skip_before_action :preload_json,
:redirect_to_login_if_required,
:check_xhr,
:verify_authenticity_token,
only: %i[show show_source_map color_scheme]
before_action :apply_cdn_headers, only: %i[show show_source_map color_scheme]
def show_source_map
show_resource(source_map: true)
end
def show
is_asset_path
show_resource
end
def color_scheme
params.require("id")
params.permit("theme_id")
manager = Stylesheet::Manager.new(theme_id: params[:theme_id])
stylesheet = manager.color_scheme_stylesheet_details(params[:id], "all")
render json: stylesheet
end
protected
def show_resource(source_map: false)
extension = source_map ? ".css.map" : ".css"
no_cookies
target, digest = params[:name].split(/_([a-f0-9]{40})/)
cache_time = request.env["HTTP_IF_MODIFIED_SINCE"]
if cache_time
begin
cache_time = Time.rfc2822(cache_time)
rescue ArgumentError
end
end
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 : ""
cache_path = Stylesheet::Manager.cache_fullpath
location = "#{cache_path}/#{target}#{underscore_digest}#{extension}"
stylesheet_time = query.pick(:created_at)
handle_missing_cache(location, target, digest) if !stylesheet_time
if cache_time && stylesheet_time && stylesheet_time <= cache_time
return render body: nil, status: 304
end
unless File.exist?(location)
if current = query.pick(source_map ? :source_map : :content)
FileUtils.mkdir_p(cache_path)
File.write(location, current)
else
raise Discourse::NotFound
end
end
if Rails.env == "development"
response.headers["Last-Modified"] = Time.zone.now.httpdate
immutable_for(1.second)
else
response.headers["Last-Modified"] = stylesheet_time.httpdate if stylesheet_time
immutable_for(1.year)
end
send_file(location, disposition: :inline)
end
def handle_missing_cache(location, name, digest)
location = location.sub(".css.map", ".css")
source_map_location = location + ".map"
existing = read_file(location)
if existing && digest
source_map = read_file(source_map_location)
StylesheetCache.add(name, digest, existing, source_map)
end
end
private
def read_file(location)
begin
File.read(location)
rescue Errno::ENOENT
end
end
end