discourse/lib/stylesheet/manager.rb

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# frozen_string_literal: true
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"
THEME_REGEX ||= /_theme$/
@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.clear_core_cache!(targets)
cache.hash.keys.select { |k| k =~ /#{targets.join('|')}/ }.each { |k| cache.delete(k) }
end
def self.clear_plugin_cache!(plugin)
cache.hash.keys.select { |k| k =~ /#{plugin}/ }.each { |k| cache.delete(k) }
end
def self.stylesheet_data(target = :desktop, theme_ids = :missing)
stylesheet_details(target, "all", theme_ids)
end
def self.stylesheet_link_tag(target = :desktop, media = 'all', theme_ids = :missing)
stylesheets = stylesheet_details(target, media, theme_ids)
stylesheets.map do |stylesheet|
href = stylesheet[:new_href]
theme_id = stylesheet[:theme_id]
data_theme_id = theme_id ? "data-theme-id=\"#{theme_id}\"" : ""
%[<link href="#{href}" media="#{media}" rel="stylesheet" data-target="#{target}" #{data_theme_id}/>]
end.join("\n").html_safe
end
def self.stylesheet_details(target = :desktop, media = 'all', theme_ids = :missing)
if theme_ids == :missing
theme_ids = [SiteSetting.default_theme_id]
end
target = target.to_sym
theme_ids = [theme_ids] unless Array === theme_ids
theme_ids = [theme_ids.first] unless target =~ THEME_REGEX
theme_ids = Theme.transform_ids(theme_ids, extend: false)
current_hostname = Discourse.current_hostname
array_cache_key = "array_themes_#{theme_ids.join(",")}_#{target}_#{current_hostname}"
stylesheets = cache[array_cache_key]
return stylesheets if stylesheets.present?
@lock.synchronize do
stylesheets = []
theme_ids.each do |theme_id|
data = { target: target }
cache_key = "path_#{target}_#{theme_id}_#{current_hostname}"
href = cache[cache_key]
unless href
builder = self.new(target, theme_id)
is_theme = builder.is_theme?
has_theme = builder.theme.present?
if is_theme && !has_theme
next
else
data[:theme_id] = builder.theme.id if has_theme && is_theme
builder.compile unless File.exists?(builder.stylesheet_fullpath)
href = builder.stylesheet_path(current_hostname)
end
cache[cache_key] = href
end
data[:theme_id] = theme_id if theme_id.present? && data[:theme_id].blank?
data[:new_href] = href
stylesheets << data
end
cache[array_cache_key] = stylesheets.freeze
stylesheets
end
end
def self.precompile_css
themes = Theme.where('user_selectable OR id = ?', SiteSetting.default_theme_id).pluck(:id, :name)
themes << nil
themes.each do |id, name|
[:desktop, :mobile, :desktop_rtl, :mobile_rtl, :desktop_theme, :mobile_theme, :admin].each do |target|
theme_id = id || SiteSetting.default_theme_id
next if target =~ THEME_REGEX && theme_id == -1
cache_key = "#{target}_#{theme_id}"
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STDERR.puts "precompile target: #{target} #{name}"
builder = self.new(target, theme_id)
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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
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globs = ["#{Rails.root}/app/assets/stylesheets/**/*.*css",
"#{Rails.root}/app/assets/images/**/*.*"]
Discourse.plugins.map { |plugin| File.dirname(plugin.path) }.each do |path|
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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 self.cache_fullpath
"#{Rails.root}/#{CACHE_PATH}"
end
def initialize(target = :desktop, theme_id)
@target = target
@theme_id = theme_id
end
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def compile(opts = {})
unless opts[:force]
if File.exists?(stylesheet_fullpath)
unless StylesheetCache.where(target: qualified_target, digest: digest).exists?
begin
source_map = begin
File.read(source_map_fullpath)
rescue Errno::ENOENT
end
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$/
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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
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if Stylesheet::Importer::THEME_TARGETS.include?(@target.to_s)
# no special errors for theme, handled in theme editor
["", nil]
else
raise Discourse::ScssError, e.message
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 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(hostname)
"#{GlobalSetting.cdn_url}#{stylesheet_relpath}?__ws=#{hostname}"
end
def stylesheet_path(hostname)
stylesheet_cdnpath(hostname)
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
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stylesheet_filename(_with_digest = false)
end
def is_theme?
!!(@target.to_s =~ THEME_REGEX)
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(id: @theme_id) || :nil
@theme == :nil ? nil : @theme
end
def theme_digest
scss = ""
if [:mobile_theme, :desktop_theme].include?(@target)
scss_digest = theme.resolve_baked_field(:common, :scss)
scss_digest += theme.resolve_baked_field(@target.to_s.sub("_theme", ""), :scss)
elsif @target == :embedded_theme
scss_digest = theme.resolve_baked_field(:common, :embedded_scss)
else
raise "attempting to look up theme digest for invalid field"
end
Digest::SHA1.hexdigest(scss_digest.to_s + color_scheme_digest.to_s + settings_digest + plugins_digest + uploads_digest)
end
# this protects us from situations where new versions of a plugin removed a file
# old instances may still be serving CSS and not aware of the change
# so we could end up poisoning the cache with a bad file that can not be removed
def plugins_digest
assets = []
DiscoursePluginRegistry.stylesheets.each { |_, paths| assets += paths.to_a }
DiscoursePluginRegistry.mobile_stylesheets.each { |_, paths| assets += paths.to_a }
DiscoursePluginRegistry.desktop_stylesheets.each { |_, paths| assets += paths.to_a }
Digest::SHA1.hexdigest(assets.sort.join)
end
def settings_digest
theme_ids = Theme.components_for(@theme_id).dup
theme_ids << @theme_id
fields = ThemeField.where(
name: "yaml",
type_id: ThemeField.types[:yaml],
theme_id: theme_ids
).pluck(:updated_at)
settings = ThemeSetting.where(theme_id: theme_ids).pluck(:updated_at)
timestamps = fields.concat(settings).map!(&:to_f).sort!.join(",")
Digest::SHA1.hexdigest(timestamps)
end
def uploads_digest
Digest::SHA1.hexdigest(ThemeField.joins(:upload).where(id: theme&.all_theme_variables).pluck(:sha1).join(","))
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