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'
require_dependency 'theme_translation_parser'
require_dependency 'theme_translation_manager'
class Theme < ActiveRecord::Base
@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 :theme_translation_overrides, dependent: :destroy
has_many :child_theme_relation, class_name: 'ChildTheme', foreign_key: 'parent_theme_id', dependent: :destroy
has_many :parent_theme_relation, class_name: 'ChildTheme', foreign_key: 'child_theme_id', dependent: :destroy
has_many :child_themes, -> { order(:name) }, through: :child_theme_relation, source: :child_theme
has_many :parent_themes, -> { order(:name) }, through: :parent_theme_relation, source: :parent_theme
has_many :color_schemes
belongs_to :remote_theme, autosave: true
has_one :settings_field, -> { where(target_id: Theme.targets[:settings], name: "yaml") }, class_name: 'ThemeField'
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has_many :locale_fields, -> { filter_locale_fields(I18n.fallbacks[I18n.locale]) }, class_name: 'ThemeField'
validate :component_validations
scope :user_selectable, ->() {
where('user_selectable OR id = ?', SiteSetting.default_theme_id)
}
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?
remove_from_cache!
clear_cached_settings!
ColorScheme.hex_cache.clear
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!
ColorScheme.hex_cache.clear
end
after_commit ->(theme) do
theme.notify_theme_change(with_scheme: theme.saved_change_to_color_scheme_id?)
end, on: [:create, :update]
def self.get_set_cache(key, &blk)
if val = @cache[key]
return val
end
@cache[key] = blk.call
end
def self.theme_ids
get_set_cache "theme_ids" do
Theme.pluck(:id)
end
end
def self.user_theme_ids
get_set_cache "user_theme_ids" do
Theme.user_selectable.pluck(:id)
end
end
def self.components_for(theme_id)
get_set_cache "theme_components_for_#{theme_id}" do
ChildTheme.where(parent_theme_id: theme_id).distinct.pluck(:child_theme_id)
end
end
def self.expire_site_cache!
Site.clear_anon_cache!
clear_cache!
ApplicationSerializer.expire_cache_fragment!("user_themes")
ColorScheme.hex_cache.clear
end
def self.clear_default!
SiteSetting.default_theme_id = -1
expire_site_cache!
end
def self.transform_ids(ids, extend: true)
return [] if ids.nil?
get_set_cache "#{extend ? "extended_" : ""}transformed_ids_#{ids.join("_")}" do
next [] if ids.blank?
ids = ids.dup
ids.uniq!
parent = ids.shift
components = ids
components.push(*components_for(parent)) if extend
components.sort!.uniq!
all_ids = [parent, *components]
disabled_ids = Theme.where(id: all_ids).includes(:remote_theme)
.reject(&:enabled?).pluck(:id)
all_ids - disabled_ids
end
end
def set_default!
if component
raise Discourse::InvalidParameters.new(
I18n.t("themes.errors.component_no_default")
)
end
SiteSetting.default_theme_id = id
Theme.expire_site_cache!
end
def default?
SiteSetting.default_theme_id == id
end
def enabled?
if minimum_version = remote_theme&.minimum_discourse_version
return false unless Discourse.has_needed_version?(Discourse::VERSION::STRING, minimum_version)
end
if maximum_version = remote_theme&.maximum_discourse_version
return false unless Discourse.has_needed_version?(maximum_version, Discourse::VERSION::STRING)
end
true
end
def component_validations
return unless component
errors.add(:base, I18n.t("themes.errors.component_no_color_scheme")) if color_scheme_id.present?
errors.add(:base, I18n.t("themes.errors.component_no_user_selectable")) if user_selectable
errors.add(:base, I18n.t("themes.errors.component_no_default")) if default?
end
def switch_to_component!
return if component
Theme.transaction do
self.component = true
self.color_scheme_id = nil
self.user_selectable = false
Theme.clear_default! if default?
ChildTheme.where("parent_theme_id = ?", id).destroy_all
self.save!
end
end
def switch_to_theme!
return unless component
Theme.transaction do
self.component = false
ChildTheme.where("child_theme_id = ?", id).destroy_all
self.save!
end
end
def self.lookup_field(theme_ids, target, field)
return if theme_ids.blank?
theme_ids = [theme_ids] unless Array === theme_ids
theme_ids = transform_ids(theme_ids)
cache_key = "#{theme_ids.join(",")}:#{target}:#{field}:#{ThemeField::COMPILER_VERSION}"
lookup = @cache[cache_key]
return lookup.html_safe if lookup
target = target.to_sym
val = resolve_baked_field(theme_ids, target, field)
(@cache[cache_key] = val || "").html_safe
end
def self.remove_from_cache!
clear_cache!
end
def self.clear_cache!
@cache.clear
end
def self.targets
@targets ||= Enum.new(common: 0, desktop: 1, mobile: 2, settings: 3, translations: 4)
end
def self.lookup_target(target_id)
self.targets.invert[target_id]
end
def self.notify_theme_change(theme_ids, with_scheme: false, clear_manager_cache: true, all_themes: false)
Stylesheet::Manager.clear_theme_cache!
targets = [:mobile_theme, :desktop_theme]
if with_scheme
targets.prepend(:desktop, :mobile, :admin)
Stylesheet::Manager.cache.clear if clear_manager_cache
end
if all_themes
message = theme_ids.map { |id| refresh_message_for_targets(targets, id) }.flatten
else
parent_ids = Theme.where(id: theme_ids).joins(:parent_themes).pluck(:parent_theme_id).uniq
message = refresh_message_for_targets(targets, theme_ids | parent_ids).flatten
end
MessageBus.publish('/file-change', message)
end
def notify_theme_change(with_scheme: false)
theme_ids = Theme.transform_ids([id])
self.class.notify_theme_change(theme_ids, with_scheme: with_scheme)
end
def self.refresh_message_for_targets(targets, theme_ids)
targets.map do |target|
Stylesheet::Manager.stylesheet_data(target.to_sym, theme_ids)
end
end
def self.resolve_baked_field(theme_ids, target, name)
list_baked_fields(theme_ids, target, name).map { |f| f.value_baked || f.value }.join("\n")
end
def self.list_baked_fields(theme_ids, target, name)
target = target.to_sym
name = name.to_sym
if target == :translations
fields = ThemeField.find_first_locale_fields(theme_ids, I18n.fallbacks[name])
else
fields = ThemeField.find_by_theme_ids(theme_ids)
.where(target_id: [Theme.targets[target], Theme.targets[:common]])
.where(name: name.to_s)
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.order(:target_id)
end
fields.each(&:ensure_baked!)
fields
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)
theme_ids = Theme.transform_ids([id])
self.class.list_baked_fields(theme_ids, target, name)
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: name, target: target)
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 = {}
ids = Theme.transform_ids([id])
ThemeField.find_by_theme_ids(ids).where(type_id: ThemeField.theme_var_type_ids).each do |field|
next if fields.key?(field.name)
fields[field.name] = field
end
fields.values
end
def add_child_theme!(theme)
new_relation = child_theme_relation.new(child_theme_id: theme.id)
if new_relation.save
child_themes.reload
save!
Theme.clear_cache!
else
raise Discourse::InvalidParameters.new(new_relation.errors.full_messages.join(", "))
end
end
def internal_translations
translations(internal: true)
end
def translations(internal: false)
fallbacks = I18n.fallbacks[I18n.locale]
begin
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data = locale_fields.first&.translation_data(with_overrides: false, internal: internal, fallback_fields: locale_fields)
return {} if data.nil?
best_translations = {}
fallbacks.reverse.each do |locale|
best_translations.deep_merge! data[locale] if data[locale]
end
ThemeTranslationManager.list_from_hash(theme: self, hash: best_translations, locale: I18n.locale)
rescue ThemeTranslationParser::InvalidYaml
{}
end
end
def settings
field = settings_field
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 = {}
Theme.where(id: Theme.transform_ids([id])).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
def update_translation(translation_key, new_value)
target_translation = translations.find { |translation| translation.key == translation_key }
raise Discourse::NotFound unless target_translation
target_translation.value = new_value
end
def translation_override_hash
hash = {}
theme_translation_overrides.each do |override|
cursor = hash
path = [override.locale] + override.translation_key.split(".")
path[0..-2].each do |key|
cursor = (cursor[key] ||= {})
end
cursor[path[-1]] = override.value
end
hash
end
def generate_metadata_hash
{}.tap do |meta|
meta[:name] = name
meta[:component] = component
RemoteTheme::METADATA_PROPERTIES.each do |property|
meta[property] = remote_theme&.public_send(property)
meta[property] = nil if meta[property] == "URL" # Clean up old discourse_theme CLI placeholders
end
meta[:assets] = {}.tap do |hash|
theme_fields.where(type_id: ThemeField.types[:theme_upload_var]).each do |field|
hash[field.name] = field.file_path
end
end
meta[:color_schemes] = {}.tap do |hash|
schemes = self.color_schemes
# The selected color scheme may not belong to the theme, so include it anyway
schemes = [self.color_scheme] + schemes if self.color_scheme
schemes.uniq.each do |scheme|
hash[scheme.name] = {}.tap { |colors| scheme.colors.each { |color| colors[color.name] = color.hex } }
end
end
meta[:learn_more] = "https://meta.discourse.org/t/beginners-guide-to-using-discourse-themes/91966"
end
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
# component :boolean default(FALSE), not null
#
# Indexes
#
# index_themes_on_remote_theme_id (remote_theme_id) UNIQUE
#