discourse/app/models/theme.rb

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require_dependency 'distributed_cache'
require_dependency 'stylesheet/compiler'
require_dependency 'stylesheet/manager'
require_dependency 'theme_settings_parser'
require_dependency 'theme_settings_manager'
class Theme < ActiveRecord::Base
# TODO: remove in 2019
self.ignored_columns = ["key"]
@cache = DistributedCache.new('theme')
belongs_to :user
belongs_to :color_scheme
has_many :theme_fields, dependent: :destroy
has_many :theme_settings, dependent: :destroy
has_many :child_theme_relation, class_name: 'ChildTheme', foreign_key: 'parent_theme_id', dependent: :destroy
has_many :child_themes, through: :child_theme_relation, source: :child_theme
has_many :color_schemes
belongs_to :remote_theme
def notify_color_change(color)
changed_colors << color
end
after_save do
color_schemes = {}
changed_colors.each do |color|
color.save!
color_schemes[color.color_scheme_id] ||= color.color_scheme
end
color_schemes.values.each(&:save!)
changed_colors.clear
changed_fields.each(&:save!)
changed_fields.clear
Theme.expire_site_cache! if saved_change_to_user_selectable? || saved_change_to_name?
@dependant_themes = nil
@included_themes = nil
remove_from_cache!
clear_cached_settings!
notify_scheme_change if saved_change_to_color_scheme_id?
end
after_destroy do
remove_from_cache!
clear_cached_settings!
if SiteSetting.default_theme_id == self.id
Theme.clear_default!
end
if self.id
ColorScheme
.where(theme_id: self.id)
.where("id NOT IN (SELECT color_scheme_id FROM themes where color_scheme_id IS NOT NULL)")
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.destroy_all
ColorScheme
.where(theme_id: self.id)
.update_all(theme_id: nil)
end
Theme.expire_site_cache!
end
after_commit ->(theme) do
theme.notify_theme_change
end, on: :update
def self.theme_ids
if ids = @cache["theme_ids"]
return ids
end
@cache["theme_ids"] = Set.new(Theme.pluck(:id))
end
def self.user_theme_ids
if ids = @cache["user_theme_ids"]
return ids
end
@cache["user_theme_ids"] = Set.new(
Theme
.where('user_selectable OR id = ?', SiteSetting.default_theme_id)
.pluck(:id)
)
end
def self.expire_site_cache!
Site.clear_anon_cache!
ApplicationSerializer.expire_cache_fragment!("user_themes")
end
def self.clear_default!
SiteSetting.default_theme_id = -1
expire_site_cache!
end
def set_default!
SiteSetting.default_theme_id = id
Theme.expire_site_cache!
end
def default?
SiteSetting.default_theme_id == id
end
def self.lookup_field(theme_id, target, field)
return if theme_id.blank?
cache_key = "#{theme_id}:#{target}:#{field}:#{ThemeField::COMPILER_VERSION}"
lookup = @cache[cache_key]
return lookup.html_safe if lookup
target = target.to_sym
theme = find_by(id: theme_id)
val = theme.resolve_baked_field(target, field) if theme
(@cache[cache_key] = val || "").html_safe
end
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def self.remove_from_cache!(themes = nil)
clear_cache!
end
def self.clear_cache!
@cache.clear
end
def self.targets
@targets ||= Enum.new(common: 0, desktop: 1, mobile: 2, settings: 3)
end
def self.lookup_target(target_id)
self.targets.invert[target_id]
end
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def notify_scheme_change(clear_manager_cache = true)
Stylesheet::Manager.cache.clear if clear_manager_cache
message = refresh_message_for_targets(["desktop", "mobile", "admin"], self)
MessageBus.publish('/file-change', message)
end
def notify_theme_change
Stylesheet::Manager.clear_theme_cache!
themes = [self] + dependant_themes
message = themes.map do |theme|
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refresh_message_for_targets([:mobile_theme, :desktop_theme], theme)
end.compact.flatten
MessageBus.publish('/file-change', message)
end
def refresh_message_for_targets(targets, theme)
targets.map do |target|
href = Stylesheet::Manager.stylesheet_href(target.to_sym, theme.id)
if href
{
target: target,
new_href: href,
theme_id: theme.id
}
end
end
end
def dependant_themes
@dependant_themes ||= resolve_dependant_themes(:up)
end
def included_themes
@included_themes ||= resolve_dependant_themes(:down)
end
def resolve_dependant_themes(direction)
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select_field, where_field = nil
if direction == :up
select_field = "parent_theme_id"
where_field = "child_theme_id"
elsif direction == :down
select_field = "child_theme_id"
where_field = "parent_theme_id"
else
raise "Unknown direction"
end
themes = []
return [] unless id
uniq = Set.new
uniq << id
iterations = 0
added = [id]
while added.length > 0 && iterations < 5
iterations += 1
new_themes = Theme.where("id in (SELECT #{select_field}
FROM child_themes
WHERE #{where_field} in (?))", added).to_a
added = []
new_themes.each do |theme|
unless uniq.include?(theme.id)
added << theme.id
uniq << theme.id
themes << theme
end
end
end
themes
end
def resolve_baked_field(target, name)
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list_baked_fields(target, name).map { |f| f.value_baked || f.value }.join("\n")
end
def list_baked_fields(target, name)
target = target.to_sym
theme_ids = [self.id] + (included_themes.map(&:id) || [])
fields = ThemeField.where(target_id: [Theme.targets[target], Theme.targets[:common]])
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.where(name: name.to_s)
.includes(:theme)
.joins("
JOIN (
SELECT #{theme_ids.map.with_index { |id, idx| "#{id} AS theme_id, #{idx} AS sort_column" }.join(" UNION ALL SELECT ")}
) as X ON X.theme_id = theme_fields.theme_id"
)
.order('sort_column, target_id')
fields.each(&:ensure_baked!)
fields
end
def remove_from_cache!
self.class.remove_from_cache!
end
def changed_fields
@changed_fields ||= []
end
def changed_colors
@changed_colors ||= []
end
def set_field(target:, name:, value: nil, type: nil, type_id: nil, upload_id: nil)
name = name.to_s
target_id = Theme.targets[target.to_sym]
raise "Unknown target #{target} passed to set field" unless target_id
type_id ||= type ? ThemeField.types[type.to_sym] : ThemeField.guess_type(name)
raise "Unknown type #{type} passed to set field" unless type_id
value ||= ""
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field = theme_fields.find { |f| f.name == name && f.target_id == target_id && f.type_id == type_id }
if field
if value.blank? && !upload_id
theme_fields.delete field.destroy
else
if field.value != value || field.upload_id != upload_id
field.value = value
field.upload_id = upload_id
changed_fields << field
end
end
else
theme_fields.build(target_id: target_id, value: value, name: name, type_id: type_id, upload_id: upload_id) if value.present? || upload_id.present?
end
end
def all_theme_variables
fields = {}
([self] + (included_themes || [])).each do |theme|
theme&.theme_fields.each do |field|
next unless ThemeField.theme_var_type_ids.include?(field.type_id)
next if fields.key?(field.name)
fields[field.name] = field
end
end
fields.values
end
def add_child_theme!(theme)
child_theme_relation.create!(child_theme_id: theme.id)
@included_themes = nil
child_themes.reload
save!
end
def settings
field = theme_fields.where(target_id: Theme.targets[:settings], name: "yaml").first
return [] unless field && field.error.nil?
settings = []
ThemeSettingsParser.new(field).load do |name, default, type, opts|
settings << ThemeSettingsManager.create(name, default, type, self, opts)
end
settings
end
def cached_settings
Rails.cache.fetch("settings_for_theme_#{self.id}", expires_in: 30.minutes) do
hash = {}
self.settings.each do |setting|
hash[setting.name] = setting.value
end
hash
end
end
def clear_cached_settings!
Rails.cache.delete("settings_for_theme_#{self.id}")
end
def included_settings
hash = {}
self.included_themes.each do |theme|
hash.merge!(theme.cached_settings)
end
hash.merge!(self.cached_settings)
hash
end
def update_setting(setting_name, new_value)
target_setting = settings.find { |setting| setting.name == setting_name }
raise Discourse::NotFound unless target_setting
target_setting.value = new_value
end
end
# == Schema Information
#
# Table name: themes
#
# id :integer not null, primary key
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# name :string not null
# user_id :integer not null
# created_at :datetime not null
# updated_at :datetime not null
# compiler_version :integer default(0), not null
# user_selectable :boolean default(FALSE), not null
# hidden :boolean default(FALSE), not null
# color_scheme_id :integer
# remote_theme_id :integer
#
# Indexes
#
# index_themes_on_remote_theme_id (remote_theme_id) UNIQUE
#