discourse/app/models/site_customization.rb

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require_dependency 'sass/discourse_sass_compiler'
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class SiteCustomization < ActiveRecord::Base
ENABLED_KEY = '7e202ef2-56d7-47d5-98d8-a9c8d15e57dd'
# placing this in uploads to ease deployment rules
CACHE_PATH = 'uploads/stylesheet-cache'
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@lock = Mutex.new
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before_create do
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self.position ||= (SiteCustomization.maximum(:position) || 0) + 1
self.enabled ||= false
self.key ||= SecureRandom.uuid
true
end
def compile_stylesheet(scss)
DiscourseSassCompiler.compile(scss, 'custom')
rescue => e
puts e.backtrace.join("\n") unless Sass::SyntaxError === e
raise e
end
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before_save do
['stylesheet', 'mobile_stylesheet'].each do |stylesheet_attr|
if self.send("#{stylesheet_attr}_changed?")
begin
self.send("#{stylesheet_attr}_baked=", compile_stylesheet(self.send(stylesheet_attr)))
rescue Sass::SyntaxError => e
self.send("#{stylesheet_attr}_baked=", DiscourseSassCompiler.error_as_css(e, "custom stylesheet"))
end
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end
end
end
after_save do
if stylesheet_changed?
File.delete(stylesheet_fullpath) if File.exists?(stylesheet_fullpath)
end
if mobile_stylesheet_changed?
File.delete(stylesheet_fullpath(:mobile)) if File.exists?(stylesheet_fullpath(:mobile))
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end
remove_from_cache!
if stylesheet_changed? or mobile_stylesheet_changed?
ensure_stylesheets_on_disk!
# TODO: this is broken now because there's mobile stuff too
MessageBus.publish "/file-change/#{key}", stylesheet_hash
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end
MessageBus.publish "/header-change/#{key}", header if header_changed?
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end
after_destroy do
if File.exists?(stylesheet_fullpath)
File.delete stylesheet_fullpath
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end
if File.exists?(stylesheet_fullpath(:mobile))
File.delete stylesheet_fullpath(:mobile)
end
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self.remove_from_cache!
end
def self.enabled_key
ENABLED_KEY.dup << RailsMultisite::ConnectionManagement.current_db
end
def self.enabled_style_key
@cache ||= {}
preview_style = @cache[enabled_key]
return if preview_style == :none
return preview_style if preview_style
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@lock.synchronize do
style = find_by(enabled: true)
if style
@cache[enabled_key] = style.key
else
@cache[enabled_key] = :none
nil
end
end
end
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def self.custom_stylesheet(preview_style, target=:desktop)
preview_style ||= enabled_style_key
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style = lookup_style(preview_style)
style.stylesheet_link_tag(target).html_safe if style
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end
def self.custom_header(preview_style, target=:desktop)
preview_style ||= enabled_style_key
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style = lookup_style(preview_style)
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if style && ((target != :mobile && style.header) || (target == :mobile && style.mobile_header))
target == :mobile ? style.mobile_header.html_safe : style.header.html_safe
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else
""
end
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end
def self.override_default_style(preview_style)
preview_style ||= enabled_style_key
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style = lookup_style(preview_style)
style.override_default_style if style
end
def self.lookup_style(key)
return if key.blank?
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# cache is cross site resiliant cause key is secure random
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@cache ||= {}
ensure_cache_listener
style = @cache[key]
return style if style
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@lock.synchronize do
style = find_by(key: key)
style.ensure_stylesheets_on_disk! if style
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@cache[key] = style
end
end
def self.ensure_cache_listener
unless @subscribed
klass = self
MessageBus.subscribe("/site_customization") do |msg|
message = msg.data
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klass.remove_from_cache!(message["key"], false)
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end
@subscribed = true
end
end
def self.remove_from_cache!(key, broadcast = true)
MessageBus.publish('/site_customization', key: key) if broadcast
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if @cache
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@lock.synchronize do
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@cache[key] = nil
end
end
end
def remove_from_cache!
self.class.remove_from_cache!(self.class.enabled_key)
self.class.remove_from_cache!(key)
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end
def stylesheet_hash(target=:desktop)
Digest::MD5.hexdigest( target == :mobile ? mobile_stylesheet : stylesheet )
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end
def cache_fullpath
"#{Rails.root}/public/#{CACHE_PATH}"
end
def ensure_stylesheets_on_disk!
[[:desktop, 'stylesheet_baked'], [:mobile, 'mobile_stylesheet_baked']].each do |target, baked_attr|
path = stylesheet_fullpath(target)
dir = cache_fullpath
FileUtils.mkdir_p(dir)
unless File.exists?(path)
File.open(path, "w") do |f|
f.puts self.send(baked_attr)
end
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end
end
end
def stylesheet_filename(target=:desktop)
target == :desktop ? "/#{self.key}.css" : "/#{target}_#{self.key}.css"
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end
def stylesheet_fullpath(target=:desktop)
"#{cache_fullpath}#{stylesheet_filename(target)}"
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end
def stylesheet_link_tag(target=:desktop)
return mobile_stylesheet_link_tag if target == :mobile
return "" unless stylesheet.present?
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return @stylesheet_link_tag if @stylesheet_link_tag
ensure_stylesheets_on_disk!
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@stylesheet_link_tag = link_css_tag "/#{CACHE_PATH}#{stylesheet_filename}?#{stylesheet_hash}"
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end
def mobile_stylesheet_link_tag
return "" unless mobile_stylesheet.present?
return @mobile_stylesheet_link_tag if @mobile_stylesheet_link_tag
ensure_stylesheets_on_disk!
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@mobile_stylesheet_link_tag = link_css_tag "/#{CACHE_PATH}#{stylesheet_filename(:mobile)}?#{stylesheet_hash(:mobile)}"
end
def link_css_tag(href)
href = (GlobalSetting.cdn_url || "") + href
%Q{<link class="custom-css" rel="stylesheet" href="#{href}" type="text/css" media="all">}
end
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end
# == Schema Information
#
# Table name: site_customizations
#
# id :integer not null, primary key
# name :string(255) not null
# stylesheet :text
# header :text
# position :integer not null
# user_id :integer not null
# enabled :boolean not null
# key :string(255) not null
# created_at :datetime not null
# updated_at :datetime not null
# override_default_style :boolean default(FALSE), not null
# stylesheet_baked :text default(""), not null
# mobile_stylesheet :text
# mobile_header :text
# mobile_stylesheet_baked :text
#
# Indexes
#
# index_site_customizations_on_key (key)
#