176 lines
4.3 KiB
Ruby
176 lines
4.3 KiB
Ruby
class SiteCustomization < ActiveRecord::Base
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ENABLED_KEY = '7e202ef2-56d7-47d5-98d8-a9c8d15e57dd'
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# placing this in uploads to ease deployment rules
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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
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self.enabled ||= false
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self.key ||= SecureRandom.uuid
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true
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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
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rescue Sass::SyntaxError => e
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error = e.sass_backtrace_str("custom stylesheet")
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error.gsub!("\n", '\A ')
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error.gsub!("'", '\27 ')
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self.stylesheet_baked =
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"#main {display: none;}
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footer {white-space: pre; margin-left: 100px;}
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footer:after{ content: '#{error}' }"
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end
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end
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end
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after_save do
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if self.stylesheet_changed?
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if File.exists?(self.stylesheet_fullpath)
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File.delete self.stylesheet_fullpath
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end
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end
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self.remove_from_cache!
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if self.stylesheet_changed?
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self.ensure_stylesheet_on_disk!
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MessageBus.publish "/file-change/#{self.key}", self.stylesheet_hash
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end
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MessageBus.publish "/header-change/#{self.key}", self.header if self.header_changed?
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end
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after_destroy do
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if File.exists?(self.stylesheet_fullpath)
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File.delete self.stylesheet_fullpath
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end
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self.remove_from_cache!
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end
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def self.enabled_key
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ENABLED_KEY.dup << RailsMultisite::ConnectionManagement.current_db
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end
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def self.enabled_style_key
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@cache ||= {}
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preview_style = @cache[self.enabled_key]
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return nil if preview_style == :none
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return preview_style if preview_style
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@lock.synchronize do
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style = self.where(enabled: true).first
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if style
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@cache[self.enabled_key] = style.key
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return style.key
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else
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@cache[self.enabled_key] = :none
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return nil
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end
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end
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end
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def self.custom_stylesheet(preview_style)
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preview_style ||= enabled_style_key
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style = lookup_style(preview_style)
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style.stylesheet_link_tag.html_safe if style
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end
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def self.custom_header(preview_style)
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preview_style ||= enabled_style_key
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style = lookup_style(preview_style)
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if style && style.header
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style.header.html_safe
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else
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""
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end
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end
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def self.override_default_style(preview_style)
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preview_style ||= enabled_style_key
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style = lookup_style(preview_style)
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style.override_default_style if style
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end
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def self.lookup_style(key)
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return if key.blank?
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# cache is cross site resiliant cause key is secure random
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@cache ||= {}
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ensure_cache_listener
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style = @cache[key]
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return style if style
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@lock.synchronize do
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style = self.where(key: key).first
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style.ensure_stylesheet_on_disk! if style
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@cache[key] = style
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end
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end
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def self.ensure_cache_listener
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unless @subscribed
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klass = self
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MessageBus.subscribe("/site_customization") do |msg|
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message = msg.data
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klass.remove_from_cache!(message["key"], false)
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end
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@subscribed = true
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end
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end
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def self.remove_from_cache!(key, broadcast=true)
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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
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end
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end
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end
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def remove_from_cache!
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self.class.remove_from_cache!(self.class.enabled_key)
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self.class.remove_from_cache!(self.key)
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end
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def stylesheet_hash
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Digest::MD5.hexdigest(self.stylesheet)
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end
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def cache_fullpath
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"#{Rails.root}/public/#{CACHE_PATH}"
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end
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def ensure_stylesheet_on_disk!
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path = stylesheet_fullpath
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dir = cache_fullpath
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FileUtils.mkdir_p(dir)
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unless File.exists?(path)
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File.open(path, "w") do |f|
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f.puts self.stylesheet_baked
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end
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end
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end
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def stylesheet_filename
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"/#{self.key}.css"
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end
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def stylesheet_fullpath
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"#{self.cache_fullpath}#{self.stylesheet_filename}"
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end
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def stylesheet_link_tag
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return "" unless self.stylesheet.present?
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return @stylesheet_link_tag if @stylesheet_link_tag
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ensure_stylesheet_on_disk!
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@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
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end
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