discourse/app/models/site_customization.rb

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class SiteCustomization < ActiveRecord::Base
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ENABLED_KEY = '7e202ef2-56d7-47d5-98d8-a9c8d15e57dd'
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CACHE_PATH = '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
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before_save do
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if self.stylesheet_changed?
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begin
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self.stylesheet_baked = Sass.compile self.stylesheet
rescue Sass::SyntaxError => e
error = e.sass_backtrace_str("custom stylesheet")
error.gsub!("\n", '\A ')
error.gsub!("'", '\27 ')
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self.stylesheet_baked =
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"#main {display: none;}
footer {white-space: pre; margin-left: 100px;}
footer:after{ content: '#{error}' }"
end
end
end
after_save do
if self.stylesheet_changed?
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if File.exists?(self.stylesheet_fullpath)
File.delete self.stylesheet_fullpath
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end
end
self.remove_from_cache!
if self.stylesheet_changed?
self.ensure_stylesheet_on_disk!
MessageBus.publish "/file-change/#{self.key}", self.stylesheet_hash
end
MessageBus.publish "/header-change/#{self.key}", self.header if self.header_changed?
end
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after_destroy do
if File.exists?(self.stylesheet_fullpath)
File.delete self.stylesheet_fullpath
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end
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[self.enabled_key]
return nil if preview_style == :none
return preview_style if preview_style
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@lock.synchronize do
style = self.where(enabled: true).first
if style
@cache[self.enabled_key] = style.key
return style.key
else
@cache[self.enabled_key] = :none
return nil
end
end
end
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def self.custom_stylesheet(preview_style)
preview_style ||= enabled_style_key
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style = lookup_style(preview_style)
style.stylesheet_link_tag.html_safe if style
end
def self.custom_header(preview_style)
preview_style ||= enabled_style_key
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style = lookup_style(preview_style)
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if style && style.header
style.header.html_safe
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
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style = self.where(key: key).first
style.ensure_stylesheet_on_disk!
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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
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)
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self.class.remove_from_cache!(self.key)
end
def stylesheet_hash
Digest::MD5.hexdigest(self.stylesheet)
end
def cache_fullpath
"#{Rails.root}/public/#{CACHE_PATH}"
end
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def ensure_stylesheet_on_disk!
path = stylesheet_fullpath
dir = cache_fullpath
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FileUtils.mkdir_p(dir)
unless File.exists?(path)
File.open(path, "w") do |f|
f.puts self.stylesheet_baked
end
end
end
def stylesheet_filename
"/#{self.key}.css"
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end
def stylesheet_fullpath
"#{self.cache_fullpath}#{self.stylesheet_filename}"
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end
def stylesheet_link_tag
return "" unless self.stylesheet.present?
return @stylesheet_link_tag if @stylesheet_link_tag
ensure_stylesheet_on_disk!
@stylesheet_link_tag = "<link class=\"custom-css\" rel=\"stylesheet\" href=\"/#{CACHE_PATH}#{self.stylesheet_filename}?#{self.stylesheet_hash}\" type=\"text/css\" media=\"screen\">"
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end
end