require_dependency 'distributed_cache' require_dependency 'stylesheet/compiler' module Stylesheet; end class Stylesheet::Manager CACHE_PATH ||= 'tmp/stylesheet-cache' MANIFEST_DIR ||= "#{Rails.root}/tmp/cache/assets/#{Rails.env}" MANIFEST_FULL_PATH ||= "#{MANIFEST_DIR}/stylesheet-manifest" @lock = Mutex.new def self.cache @cache ||= DistributedCache.new("discourse_stylesheet") end def self.clear_theme_cache! cache.hash.keys.select { |k| k =~ /theme/ }.each { |k|cache.delete(k) } end def self.stylesheet_href(target = :desktop, theme_key = :missing) href = stylesheet_link_tag(target, 'all', theme_key) if href href.split(/["']/)[1] end end def self.stylesheet_link_tag(target = :desktop, media = 'all', theme_key = :missing) target = target.to_sym if theme_key == :missing theme_key = SiteSetting.default_theme_key end cache_key = "#{target}_#{theme_key}" tag = cache[cache_key] return tag.dup.html_safe if tag @lock.synchronize do builder = self.new(target, theme_key) if builder.is_theme? && !builder.theme tag = "" else builder.compile unless File.exists?(builder.stylesheet_fullpath) tag = %[] end cache[cache_key] = tag tag.dup.html_safe end end def self.precompile_css themes = Theme.where('user_selectable OR key = ?', SiteSetting.default_theme_key).pluck(:key, :name) themes << nil themes.each do |key, name| [:desktop, :mobile, :desktop_rtl, :mobile_rtl].each do |target| theme_key = key || SiteSetting.default_theme_key cache_key = "#{target}_#{theme_key}" STDERR.puts "precompile target: #{target} #{name}" builder = self.new(target, theme_key) builder.compile(force: true) cache[cache_key] = nil end end nil end def self.last_file_updated if Rails.env.production? @last_file_updated ||= if File.exists?(MANIFEST_FULL_PATH) File.readlines(MANIFEST_FULL_PATH, 'r')[0] else mtime = max_file_mtime FileUtils.mkdir_p(MANIFEST_DIR) File.open(MANIFEST_FULL_PATH, "w") { |f| f.print(mtime) } mtime end else max_file_mtime end end def self.max_file_mtime globs = ["#{Rails.root}/app/assets/stylesheets/**/*.*css", "#{Rails.root}/app/assets/images/**/*.*"] Discourse.plugins.map { |plugin| File.dirname(plugin.path) }.each do |path| globs << "#{path}/plugin.rb" globs << "#{path}/**/*.*css" end globs.map do |pattern| Dir.glob(pattern).map { |x| File.mtime(x) }.max end.compact.max.to_i end def initialize(target = :desktop, theme_key) @target = target @theme_key = theme_key end def compile(opts = {}) unless opts[:force] if File.exists?(stylesheet_fullpath) unless StylesheetCache.where(target: qualified_target, digest: digest).exists? begin source_map = File.read(source_map_fullpath) rescue nil StylesheetCache.add(qualified_target, digest, File.read(stylesheet_fullpath), source_map) rescue => e Rails.logger.warn "Completely unexpected error adding contents of '#{stylesheet_fullpath}' to cache #{e}" end end return true end end rtl = @target.to_s =~ /_rtl$/ css, source_map = begin Stylesheet::Compiler.compile_asset( @target, rtl: rtl, theme_id: theme&.id, source_map_file: source_map_filename ) rescue SassC::SyntaxError => e Rails.logger.error "Failed to compile #{@target} stylesheet: #{e.message}" if %w{embedded_theme mobile_theme desktop_theme}.include?(@target.to_s) # no special errors for theme, handled in theme editor ["", nil] else [Stylesheet::Compiler.error_as_css(e, "#{@target} stylesheet"), nil] end end FileUtils.mkdir_p(cache_fullpath) File.open(stylesheet_fullpath, "w") do |f| f.puts css end if source_map.present? File.open(source_map_fullpath, "w") do |f| f.puts source_map end end begin StylesheetCache.add(qualified_target, digest, css, source_map) rescue => e Rails.logger.warn "Completely unexpected error adding item to cache #{e}" end css end def self.cache_fullpath "#{Rails.root}/#{CACHE_PATH}" end def cache_fullpath self.class.cache_fullpath end def stylesheet_fullpath "#{cache_fullpath}/#{stylesheet_filename}" end def source_map_fullpath "#{cache_fullpath}/#{source_map_filename}" end def source_map_filename "#{stylesheet_filename}.map" end def stylesheet_fullpath_no_digest "#{cache_fullpath}/#{stylesheet_filename_no_digest}" end def stylesheet_cdnpath "#{GlobalSetting.cdn_url}#{stylesheet_relpath}?__ws=#{Discourse.current_hostname}" end def stylesheet_path stylesheet_cdnpath end def root_path "#{GlobalSetting.relative_url_root}/" end def stylesheet_relpath "#{root_path}stylesheets/#{stylesheet_filename}" end def stylesheet_relpath_no_digest "#{root_path}stylesheets/#{stylesheet_filename_no_digest}" end def qualified_target if is_theme? "#{@target}_#{theme.id}" else scheme_string = theme && theme.color_scheme ? "_#{theme.color_scheme.id}" : "" "#{@target}#{scheme_string}" end end def stylesheet_filename(with_digest = true) digest_string = "_#{self.digest}" if with_digest "#{qualified_target}#{digest_string}.css" end def stylesheet_filename_no_digest stylesheet_filename(_with_digest = false) end def is_theme? !!(@target.to_s =~ /_theme$/) end # digest encodes the things that trigger a recompile def digest @digest ||= begin if is_theme? theme_digest else color_scheme_digest end end end def theme @theme ||= (Theme.find_by(key: @theme_key) || :nil) @theme == :nil ? nil : @theme end def theme_digest scss = "" if [:mobile_theme, :desktop_theme].include?(@target) scss = theme.resolve_baked_field(:common, :scss) scss += theme.resolve_baked_field(@target.to_s.sub("_theme", ""), :scss) elsif @target == :embedded_theme scss = theme.resolve_baked_field(:common, :embedded_scss) else raise "attempting to look up theme digest for invalid field" end Digest::SHA1.hexdigest(scss.to_s + color_scheme_digest.to_s) end def color_scheme_digest cs = theme&.color_scheme category_updated = Category.where("uploaded_background_id IS NOT NULL").pluck(:updated_at).map(&:to_i).sum if cs || category_updated > 0 Digest::SHA1.hexdigest "#{RailsMultisite::ConnectionManagement.current_db}-#{cs&.id}-#{cs&.version}-#{Stylesheet::Manager.last_file_updated}-#{category_updated}" else digest_string = "defaults-#{Stylesheet::Manager.last_file_updated}" if cdn_url = GlobalSetting.cdn_url digest_string = "#{digest_string}-#{cdn_url}" end Digest::SHA1.hexdigest digest_string end end end