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manager.rb
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manager.rb
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# frozen_string_literal: true
require "distributed_cache"
require "stylesheet/compiler"
module Stylesheet
end
class Stylesheet::Manager
BASE_COMPILER_VERSION = 2
CACHE_PATH = "tmp/stylesheet-cache"
private_constant :CACHE_PATH
MANIFEST_DIR ||= "#{Rails.root}/tmp/cache/assets/#{Rails.env}"
THEME_REGEX ||= /_theme\z/
COLOR_SCHEME_STYLESHEET ||= "color_definitions"
@@lock = Mutex.new
def self.cache
@cache ||= DistributedCache.new("discourse_stylesheet")
end
def self.clear_theme_cache!
cache.clear_regex(/theme/)
end
def self.clear_color_scheme_cache!
cache.clear_regex(/color_definitions/)
end
def self.clear_core_cache!(targets)
cache.clear_regex(/#{targets.join("|")}/)
end
def self.clear_plugin_cache!(plugin)
cache.clear_regex(/#{plugin}/)
end
def self.color_scheme_cache_key(color_scheme, theme_id = nil)
color_scheme_name = Slug.for(color_scheme.name) + color_scheme&.id.to_s
theme_string = theme_id ? "_theme#{theme_id}" : ""
"#{COLOR_SCHEME_STYLESHEET}_#{color_scheme_name}_#{theme_string}_#{Discourse.current_hostname}"
end
def self.precompile_css
targets = %i[desktop mobile admin wizard desktop_rtl mobile_rtl admin_rtl wizard_rtl]
targets +=
Discourse.find_plugin_css_assets(
include_disabled: true,
mobile_view: true,
desktop_view: true,
)
targets +=
Discourse.find_plugin_css_assets(
include_disabled: true,
mobile_view: true,
desktop_view: true,
rtl: true,
)
targets.each do |target|
$stderr.puts "precompile target: #{target}"
Stylesheet::Manager::Builder.new(target: target, manager: nil).compile(force: true)
end
end
def self.precompile_theme_css
themes =
Theme.where("user_selectable OR id = ?", SiteSetting.default_theme_id).pluck(
:id,
:color_scheme_id,
)
color_schemes = ColorScheme.where(user_selectable: true).to_a
color_schemes << ColorScheme.find_by(id: SiteSetting.default_dark_mode_color_scheme_id)
color_schemes << ColorScheme.base
color_schemes = color_schemes.compact.uniq
targets = %i[desktop_theme mobile_theme]
compiled = Set.new
themes.each do |theme_id, color_scheme_id|
manager = self.new(theme_id: theme_id)
targets.each do |target|
next if theme_id == -1
scss_checker = ScssChecker.new(target, manager.theme_ids)
manager
.load_themes(manager.theme_ids)
.each do |theme|
next if compiled.include?("#{target}_#{theme.id}")
builder =
Stylesheet::Manager::Builder.new(target: target, theme: theme, manager: manager)
next if theme.component && !scss_checker.has_scss(theme.id)
$stderr.puts "precompile target: #{target} #{theme.name}"
builder.compile(force: true)
compiled << "#{target}_#{theme.id}"
end
end
theme_color_scheme = ColorScheme.find_by_id(color_scheme_id)
theme = manager.get_theme(theme_id)
[theme_color_scheme, *color_schemes].compact.uniq.each do |scheme|
$stderr.puts "precompile target: #{COLOR_SCHEME_STYLESHEET} #{theme.name} (#{scheme.name})"
Stylesheet::Manager::Builder.new(
target: COLOR_SCHEME_STYLESHEET,
theme: theme,
color_scheme: scheme,
manager: manager,
).compile(force: true)
end
clear_color_scheme_cache!
end
nil
end
def self.fs_asset_cachebuster
if use_file_hash_for_cachebuster?
@cachebuster ||=
if File.exist?(manifest_full_path)
File.readlines(manifest_full_path, "r")[0]
else
cachebuster = "#{BASE_COMPILER_VERSION}:#{fs_assets_hash}"
FileUtils.mkdir_p(MANIFEST_DIR)
File.open(manifest_full_path, "w") { |f| f.print(cachebuster) }
cachebuster
end
else
"#{BASE_COMPILER_VERSION}:#{max_file_mtime}"
end
end
def self.recalculate_fs_asset_cachebuster!
File.delete(manifest_full_path) if File.exist?(manifest_full_path)
@cachebuster = nil
fs_asset_cachebuster
end
def self.manifest_full_path
path = "#{MANIFEST_DIR}/stylesheet-manifest"
return path if !Rails.env.test?
"#{path}-test_#{ENV["TEST_ENV_NUMBER"].presence || "0"}"
end
private_class_method :manifest_full_path
def self.use_file_hash_for_cachebuster?
Rails.env.production?
end
private_class_method :use_file_hash_for_cachebuster?
def self.list_files
globs = [
"#{Rails.root}/app/assets/stylesheets/**/*.*css",
"#{Rails.root}/app/assets/images/**/*.*",
]
Discourse.plugins.each do |plugin|
path = File.dirname(plugin.path)
globs << "#{path}/plugin.rb"
globs << "#{path}/assets/stylesheets/**/*.*css"
end
globs.flat_map { |g| Dir.glob(g) }.compact
end
private_class_method :list_files
def self.max_file_mtime
list_files.map { |x| File.mtime(x) }.compact.max.to_i
end
private_class_method :max_file_mtime
def self.fs_assets_hash
hashes = list_files.sort.map { |x| Digest::SHA1.hexdigest("#{x}: #{File.read(x)}") }
Digest::SHA1.hexdigest(hashes.join("|"))
end
private_class_method :fs_assets_hash
def self.cache_fullpath
path = "#{Rails.root}/#{CACHE_PATH}"
return path if !Rails.env.test?
File.join(path, "test_#{ENV["TEST_ENV_NUMBER"].presence || "0"}")
end
if Rails.env.test?
def self.rm_cache_folder
FileUtils.rm_rf(cache_fullpath)
end
end
attr_reader :theme_ids
def initialize(theme_id: nil)
@theme_id = theme_id
@theme_ids = Theme.transform_ids(@theme_id)
@themes_cache = {}
end
def cache
self.class.cache
end
def get_theme(theme_id)
if theme = @themes_cache[theme_id]
theme
else
load_themes([theme_id]).first
end
end
def load_themes(theme_ids)
themes = []
to_load_theme_ids = []
theme_ids.each do |theme_id|
if @themes_cache[theme_id]
themes << @themes_cache[theme_id]
else
to_load_theme_ids << theme_id
end
end
Theme
.where(id: to_load_theme_ids)
.includes(:yaml_theme_fields, :theme_settings, :upload_fields, :builder_theme_fields)
.each do |theme|
@themes_cache[theme.id] = theme
themes << theme
end
themes
end
def stylesheet_data(target = :desktop)
stylesheet_details(target, "all")
end
def stylesheet_preload_tag(target = :desktop, media = "all")
stylesheets = stylesheet_details(target, media)
stylesheets
.map do |stylesheet|
href = stylesheet[:new_href]
%[<link href="#{href}" rel="preload" as="style"/>]
end
.join("\n")
.html_safe
end
def stylesheet_link_tag(target = :desktop, media = "all", preload_callback = nil)
stylesheets = stylesheet_details(target, media)
stylesheets
.map do |stylesheet|
href = stylesheet[:new_href]
preload_callback.call(href, "style") if preload_callback
theme_id = stylesheet[:theme_id]
data_theme_id = theme_id ? "data-theme-id=\"#{theme_id}\"" : ""
theme_name = stylesheet[:theme_name]
data_theme_name = theme_name ? "data-theme-name=\"#{CGI.escapeHTML(theme_name)}\"" : ""
%[<link href="#{href}" media="#{media}" rel="stylesheet" data-target="#{target}" #{data_theme_id} #{data_theme_name}/>]
end
.join("\n")
.html_safe
end
def stylesheet_details(target = :desktop, media = "all")
target = target.to_sym
current_hostname = Discourse.current_hostname
is_theme_target = !!(target.to_s =~ THEME_REGEX)
array_cache_key =
(
if is_theme_target
"array_themes_#{@theme_ids.join(",")}_#{target}_#{current_hostname}"
else
"array_#{target}_#{current_hostname}"
end
)
cache.defer_get_set(array_cache_key) do
@@lock.synchronize do
stylesheets = []
if is_theme_target
scss_checker = ScssChecker.new(target, @theme_ids)
themes = load_themes(@theme_ids)
themes.each do |theme|
theme_id = theme&.id
data = {
target: target,
theme_id: theme_id,
theme_name: theme&.name&.downcase,
remote: theme.remote_theme_id?,
}
builder = Builder.new(target: target, theme: theme, manager: self)
next if builder.theme&.component && !scss_checker.has_scss(theme_id)
builder.compile unless File.exist?(builder.stylesheet_fullpath)
href = builder.stylesheet_absolute_url
data[:new_href] = href
stylesheets << data
end
if stylesheets.size > 1
stylesheets =
stylesheets.sort_by do |s|
[s[:remote] ? 0 : 1, s[:theme_id] == @theme_id ? 1 : 0, s[:theme_name]]
end
end
else
builder = Builder.new(target: target, manager: self)
builder.compile unless File.exist?(builder.stylesheet_fullpath)
href = builder.stylesheet_absolute_url
data = { target: target, new_href: href }
stylesheets << data
end
stylesheets
end
end
end
def color_scheme_stylesheet_details(color_scheme_id = nil, media)
theme_id = @theme_id || SiteSetting.default_theme_id
color_scheme =
begin
ColorScheme.find(color_scheme_id)
rescue StandardError
# don't load fallback when requesting dark color scheme
return false if media != "all"
get_theme(theme_id)&.color_scheme || ColorScheme.base
end
return false if !color_scheme
target = COLOR_SCHEME_STYLESHEET.to_sym
current_hostname = Discourse.current_hostname
cache_key = self.class.color_scheme_cache_key(color_scheme, theme_id)
cache.defer_get_set(cache_key) do
stylesheet = { color_scheme_id: color_scheme.id }
theme = get_theme(theme_id)
builder =
Builder.new(
target: target,
theme: get_theme(theme_id),
color_scheme: color_scheme,
manager: self,
)
builder.compile unless File.exist?(builder.stylesheet_fullpath)
href = builder.stylesheet_absolute_url
stylesheet[:new_href] = href
stylesheet.freeze
end
end
def color_scheme_stylesheet_preload_tag(color_scheme_id = nil, media = "all")
stylesheet = color_scheme_stylesheet_details(color_scheme_id, media)
return "" if !stylesheet
href = stylesheet[:new_href]
%[<link href="#{href}" rel="preload" as="style"/>].html_safe
end
def color_scheme_stylesheet_link_tag(color_scheme_id = nil, media = "all", preload_callback = nil)
stylesheet = color_scheme_stylesheet_details(color_scheme_id, media)
return "" if !stylesheet
href = stylesheet[:new_href]
preload_callback.call(href, "style") if preload_callback
css_class = media == "all" ? "light-scheme" : "dark-scheme"
%[<link href="#{href}" media="#{media}" rel="stylesheet" class="#{css_class}"/>].html_safe
end
end