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$/
COLOR_SCHEME_STYLESHEET ||= "color_definitions"
@@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_color_scheme_cache!
cache.hash.keys.select { |k| k =~ /color_definitions/ }.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.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 = [:desktop, :mobile, :desktop_rtl, :mobile_rtl, :admin, :wizard]
targets += Discourse.find_plugin_css_assets(include_disabled: true, mobile_view: true, desktop_view: 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 = [:desktop_theme, :mobile_theme]
compiled = Set.new
themes.each do |theme_id, color_scheme_id|
manager = self.new(theme_id: theme_id)
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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.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}/assets/stylesheets/**/*.*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
path = "#{Rails.root}/#{CACHE_PATH}"
return path if !Rails.env.test?
File.join(path, "test_#{ENV['TEST_ENV_NUMBER'].presence || '0'}")
end
attr_reader :theme_ids
def initialize(theme_id: nil)
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@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_link_tag(target = :desktop, media = 'all')
stylesheets = stylesheet_details(target, media)
stylesheets.map do |stylesheet|
href = stylesheet[:new_href]
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 = is_theme_target ?
"array_themes_#{@theme_ids.join(",")}_#{target}_#{current_hostname}" :
"array_#{target}_#{current_hostname}"
stylesheets = cache[array_cache_key]
return stylesheets if stylesheets.present?
@@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.exists?(builder.stylesheet_fullpath)
href = builder.stylesheet_path(current_hostname)
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.exists?(builder.stylesheet_fullpath)
href = builder.stylesheet_path(current_hostname)
data = { target: target, new_href: href }
stylesheets << data
end
cache.defer_set(array_cache_key, stylesheets.freeze)
stylesheets
end
end
def color_scheme_stylesheet_details(color_scheme_id = nil, media)
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theme_id = @theme_id || SiteSetting.default_theme_id
color_scheme = begin
ColorScheme.find(color_scheme_id)
rescue
# 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)
stylesheets = cache[cache_key]
return stylesheets if stylesheets.present?
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.exists?(builder.stylesheet_fullpath)
href = builder.stylesheet_path(current_hostname)
stylesheet[:new_href] = href
cache.defer_set(cache_key, stylesheet.freeze)
stylesheet
end
def color_scheme_stylesheet_link_tag(color_scheme_id = nil, media = 'all')
stylesheet = color_scheme_stylesheet_details(color_scheme_id, media)
return '' if !stylesheet
href = stylesheet[:new_href]
css_class = media == 'all' ? "light-scheme" : "dark-scheme"
%[<link href="#{href}" media="#{media}" rel="stylesheet" class="#{css_class}"/>].html_safe
end
end