discourse/app/controllers/stylesheets_controller.rb

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# frozen_string_literal: true
class StylesheetsController < ApplicationController
skip_before_action :preload_json, :redirect_to_login_if_required, :check_xhr, :verify_authenticity_token, only: [:show, :show_source_map]
def show_source_map
show_resource(source_map: true)
end
def show
is_asset_path
show_resource
end
protected
def show_resource(source_map: false)
extension = source_map ? ".css.map" : ".css"
params[:name]
no_cookies
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target, digest = params[:name].split(/_([a-f0-9]{40})/)
if !Rails.env.production?
# TODO add theme
# calling this method ensures we have a cache for said target
# we hold of re-compilation till someone asks for asset
if target.include?("theme")
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split_target, theme_id = target.split(/_(-?[0-9]+)/)
theme = Theme.find_by(id: theme_id) if theme_id.present?
else
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split_target, color_scheme_id = target.split(/_(-?[0-9]+)/)
theme = Theme.find_by(color_scheme_id: color_scheme_id)
end
Stylesheet::Manager.stylesheet_link_tag(split_target, nil, theme&.id)
end
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 = "#{Rails.root}/#{Stylesheet::Manager::CACHE_PATH}"
location = "#{cache_path}/#{target}#{underscore_digest}#{extension}"
stylesheet_time = query.pluck_first(:created_at)
if !stylesheet_time
handle_missing_cache(location, target, digest)
end
if cache_time && stylesheet_time && stylesheet_time <= cache_time
return render body: nil, status: 304
end
unless File.exist?(location)
if current = query.pluck_first(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
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def read_file(location)
begin
File.read(location)
rescue Errno::ENOENT
end
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end
end