discourse/lib/site_setting_extension.rb

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require_dependency 'site_settings/deprecated_settings'
require_dependency 'site_settings/type_supervisor'
require_dependency 'site_settings/defaults_provider'
require_dependency 'site_settings/db_provider'
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module SiteSettingExtension
include SiteSettings::DeprecatedSettings
extend Forwardable
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def_delegator :defaults, :site_locale, :default_locale
def_delegator :defaults, :site_locale=, :default_locale=
def_delegator :defaults, :has_setting?
def_delegators 'SiteSettings::TypeSupervisor', :types, :supported_types
# part 1 of refactor, centralizing the dependency here
def provider=(val)
@provider = val
refresh!
end
def provider
@provider ||= SiteSettings::DbProvider.new(SiteSetting)
end
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def mutex
@mutex ||= Mutex.new
end
def current
@containers ||= {}
@containers[provider.current_site] ||= {}
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end
def defaults
@defaults ||= SiteSettings::DefaultsProvider.new(self)
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end
def type_supervisor
@type_supervisor ||= SiteSettings::TypeSupervisor.new(defaults)
end
def categories
@categories ||= {}
end
def shadowed_settings
@shadowed_settings ||= []
end
def hidden_settings
@hidden_settings ||= []
end
def refresh_settings
@refresh_settings ||= []
end
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def client_settings
@client_settings ||= []
end
def previews
@previews ||= {}
end
def setting(name_arg, default = nil, opts = {})
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name = name_arg.to_sym
shadowed_val = nil
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mutex.synchronize do
defaults.load_setting(
name,
default,
opts.extract!(*SiteSettings::DefaultsProvider::CONSUMED_OPTS)
)
categories[name] = opts[:category] || :uncategorized
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if opts[:hidden]
hidden_settings << name
end
if opts[:shadowed_by_global] && GlobalSetting.respond_to?(name)
val = GlobalSetting.send(name)
unless val.nil? || (val == ''.freeze)
shadowed_val = val
hidden_settings << name
shadowed_settings << name
end
end
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if opts[:refresh]
refresh_settings << name
end
if opts[:client]
client_settings << name.to_sym
end
if opts[:preview]
previews[name] = opts[:preview]
end
type_supervisor.load_setting(
name,
opts.extract!(*SiteSettings::TypeSupervisor::CONSUMED_OPTS)
)
if !shadowed_val.nil?
setup_shadowed_methods(name, shadowed_val)
else
setup_methods(name)
end
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end
end
def settings_hash
result = {}
defaults.each_key do |s|
result[s] = send(s).to_s
end
result
end
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def client_settings_json
Rails.cache.fetch(SiteSettingExtension.client_settings_cache_key, expires_in: 30.minutes) do
client_settings_json_uncached
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end
end
def client_settings_json_uncached
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MultiJson.dump(Hash[*@client_settings.map { |n| [n, self.send(n)] }.flatten])
end
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# Retrieve all settings
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def all_settings(include_hidden = false)
defaults
.reject { |s, _| !include_hidden && hidden_settings.include?(s) }
.map do |s, v|
value = send(s)
opts = {
setting: s,
description: description(s),
default: defaults[s].to_s,
value: value.to_s,
category: categories[s],
preview: previews[s]
}.merge(type_supervisor.type_hash(s))
opts
end.unshift(defaults.locale_setting_hash)
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end
def description(setting)
I18n.t("site_settings.#{setting}")
end
def self.client_settings_cache_key
# NOTE: we use the git version in the key to ensure
# that we don't end up caching the incorrect version
# in cases where we are cycling unicorns
"client_settings_json_#{Discourse.git_version}"
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end
# refresh all the site settings
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def refresh!
mutex.synchronize do
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ensure_listen_for_changes
new_hash = Hash[*(defaults.db_all.map { |s|
[s.name.to_sym, type_supervisor.to_rb_value(s.name, s.value, s.data_type)]
}.to_a.flatten)]
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defaults_view = defaults.all
# add locale default and defaults based on default_locale, cause they are cached
new_hash = defaults_view.merge!(new_hash)
# add shadowed
shadowed_settings.each { |ss| new_hash[ss] = GlobalSetting.send(ss) }
changes, deletions = diff_hash(new_hash, current)
changes.each { |name, val| current[name] = val }
deletions.each { |name, _| current[name] = defaults_view[name] }
clear_cache!
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end
end
def ensure_listen_for_changes
unless @subscribed
MessageBus.subscribe("/site_settings") do |message|
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process_message(message)
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end
@subscribed = true
end
end
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def process_message(message)
data = message.data
if data["process"] != process_id
begin
@last_message_processed = message.global_id
MessageBus.on_connect.call(message.site_id)
refresh!
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ensure
MessageBus.on_disconnect.call(message.site_id)
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end
end
end
def diags
{
last_message_processed: @last_message_processed
}
end
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def process_id
@process_id ||= SecureRandom.uuid
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end
def after_fork
@process_id = nil
ensure_listen_for_changes
end
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def remove_override!(name)
provider.destroy(name)
current[name] = defaults[name]
clear_cache!
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end
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def add_override!(name, val)
val, type = type_supervisor.to_db_value(name, val)
provider.save(name, val, type)
current[name] = type_supervisor.to_rb_value(name, val)
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notify_clients!(name) if client_settings.include? name
clear_cache!
end
def notify_changed!
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MessageBus.publish('/site_settings', process: process_id)
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end
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def notify_clients!(name)
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MessageBus.publish('/client_settings', name: name, value: self.send(name))
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end
def requires_refresh?(name)
refresh_settings.include?(name.to_sym)
end
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def filter_value(name, value)
if %w[disabled_image_download_domains onebox_domains_blacklist exclude_rel_nofollow_domains email_domains_blacklist email_domains_whitelist white_listed_spam_host_domains].include? name
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domain_array = []
value.split('|').each { |url| domain_array << get_hostname(url) }
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value = domain_array.join("|")
end
value
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end
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def set(name, value)
if has_setting?(name)
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value = filter_value(name, value)
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self.send("#{name}=", value)
Discourse.request_refresh! if requires_refresh?(name)
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else
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raise ArgumentError.new("Either no setting named '#{name}' exists or value provided is invalid")
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end
end
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def set_and_log(name, value, user = Discourse.system_user)
prev_value = send(name)
set(name, value)
StaffActionLogger.new(user).log_site_setting_change(name, prev_value, value) if has_setting?(name)
end
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protected
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def clear_cache!
Rails.cache.delete(SiteSettingExtension.client_settings_cache_key)
Site.clear_anon_cache!
end
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def diff_hash(new_hash, old)
changes = []
deletions = []
new_hash.each do |name, value|
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changes << [name, value] if !old.has_key?(name) || old[name] != value
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end
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old.each do |name, value|
deletions << [name, value] unless new_hash.has_key?(name)
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end
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[changes, deletions]
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end
def setup_shadowed_methods(name, value)
clean_name = name.to_s.sub("?", "").to_sym
define_singleton_method clean_name do
value
end
define_singleton_method "#{clean_name}?" do
value
end
define_singleton_method "#{clean_name}=" do |val|
Rails.logger.warn("An attempt was to change #{clean_name} SiteSetting to #{val} however it is shadowed so this will be ignored!")
nil
end
end
def setup_methods(name)
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clean_name = name.to_s.sub("?", "").to_sym
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define_singleton_method clean_name do
if (c = current[name]).nil?
refresh!
current[name]
else
c
end
end
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define_singleton_method "#{clean_name}?" do
self.send clean_name
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end
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define_singleton_method "#{clean_name}=" do |val|
add_override!(name, val)
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end
end
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def get_hostname(url)
unless (URI.parse(url).scheme rescue nil).nil?
url = "http://#{url}" if URI.parse(url).scheme.nil?
url = URI.parse(url).host
end
url
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end
private
def logger
Rails.logger
end
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end