discourse/app/models/site.rb

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# frozen_string_literal: true
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# A class we can use to serialize the site data
class Site
include ActiveModel::Serialization
cattr_accessor :preloaded_category_custom_fields
def self.reset_preloaded_category_custom_fields
self.preloaded_category_custom_fields = Set.new
end
reset_preloaded_category_custom_fields
##
# Sometimes plugins need to have additional data or options available
# when rendering custom markdown features/rules that are not available
# on the default opts.discourse object. These additional options should
# be namespaced to the plugin adding them.
#
# ```
# Site.markdown_additional_options["chat"] = { limited_pretty_text_markdown_rules: [] }
# ```
#
# These are passed down to markdown rules on opts.discourse.additionalOptions.
cattr_accessor :markdown_additional_options
self.markdown_additional_options = {}
def self.add_categories_callbacks(&block)
categories_callbacks << block
end
def self.categories_callbacks
@categories_callbacks ||= []
end
def initialize(guardian)
@guardian = guardian
end
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def site_setting
SiteSetting
end
def notification_types
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Notification.types
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end
def trust_levels
TrustLevel.levels
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end
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def user_fields
UserField.includes(:user_field_options).order(:position).all
end
def self.categories_cache_key
"site_categories_#{Discourse.git_version}"
end
def self.clear_cache
Discourse.cache.delete(categories_cache_key)
end
def self.all_categories_cache
# Categories do not change often so there is no need for us to run the
# same query and spend time creating ActiveRecord objects for every requests.
#
# Do note that any new association added to the eager loading needs a
# corresponding ActiveRecord callback to clear the categories cache.
Discourse
.cache
.fetch(categories_cache_key, expires_in: 30.minutes) do
categories =
begin
query =
Category
.includes(
:uploaded_logo,
:uploaded_logo_dark,
:uploaded_background,
:uploaded_background_dark,
:tags,
:tag_groups,
:form_templates,
category_required_tag_groups: :tag_group,
)
.joins("LEFT JOIN topics t on t.id = categories.topic_id")
.select("categories.*, t.slug topic_slug")
.order(:position)
query =
DiscoursePluginRegistry.apply_modifier(:site_all_categories_cache_query, query, self)
query.to_a
end
if preloaded_category_custom_fields.present?
Category.preload_custom_fields(categories, preloaded_category_custom_fields)
end
ActiveModel::ArraySerializer.new(
categories,
each_serializer: SiteCategorySerializer,
).as_json
end
end
def categories
if @guardian.can_lazy_load_categories?
preloaded_category_ids = []
if @guardian.authenticated?
sidebar_category_ids = @guardian.user.secured_sidebar_category_ids(@guardian)
preloaded_category_ids.concat(
Category
.secured(@guardian)
.select(:parent_category_id)
.distinct
.where(id: sidebar_category_ids)
.pluck(:parent_category_id),
)
preloaded_category_ids.concat(sidebar_category_ids)
end
end
@categories ||=
begin
categories = []
self.class.all_categories_cache.each do |category|
if (
!@guardian.can_lazy_load_categories? ||
preloaded_category_ids.include?(category[:id])
) &&
@guardian.can_see_serialized_category?(
category_id: category[:id],
read_restricted: category[:read_restricted],
)
categories << category
end
end
with_children = Set.new
categories.each { |c| with_children << c[:parent_category_id] if c[:parent_category_id] }
allowed_topic_create = nil
unless @guardian.is_admin?
allowed_topic_create_ids =
@guardian.anonymous? ? [] : Category.topic_create_allowed(@guardian).pluck(:id)
allowed_topic_create = Set.new(allowed_topic_create_ids)
end
by_id = {}
notification_levels = CategoryUser.notification_levels_for(@guardian.user)
default_notification_level = CategoryUser.default_notification_level
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categories.each do |category|
category[:notification_level] = notification_levels[category[:id]] ||
default_notification_level
category[:permission] = CategoryGroup.permission_types[
:full
] if allowed_topic_create&.include?(category[:id]) || @guardian.is_admin?
category[:has_children] = with_children.include?(category[:id])
category[:can_edit] = @guardian.can_edit_serialized_category?(
category_id: category[:id],
read_restricted: category[:read_restricted],
)
by_id[category[:id]] = category
end
categories.reject! { |c| c[:parent_category_id] && !by_id[c[:parent_category_id]] }
self.class.categories_callbacks.each { |callback| callback.call(categories, @guardian) }
categories
end
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end
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def groups
query =
Group.visible_groups(@guardian.user, "groups.name ASC", include_everyone: true).includes(
:flair_upload,
)
query = DiscoursePluginRegistry.apply_modifier(:site_groups_query, query, self)
query
end
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def archetypes
Archetype.list.reject { |t| t.id == Archetype.private_message }
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end
def auth_providers
Discourse.enabled_auth_providers
end
def self.json_for(guardian)
if guardian.anonymous? && SiteSetting.login_required
return(
{
periods: TopTopic.periods.map(&:to_s),
filters: Discourse.filters.map(&:to_s),
user_fields:
UserField
.includes(:user_field_options)
.order(:position)
.all
.map { |userfield| UserFieldSerializer.new(userfield, root: false, scope: guardian) },
auth_providers:
Discourse.enabled_auth_providers.map do |provider|
AuthProviderSerializer.new(provider, root: false, scope: guardian)
end,
}.to_json
)
end
seq = nil
if guardian.anonymous?
seq = MessageBus.last_id("/site_json")
cached_json, cached_seq, cached_version =
Discourse.redis.mget("site_json", "site_json_seq", "site_json_version")
if cached_json && seq == cached_seq.to_i && Discourse.git_version == cached_version
return cached_json
end
end
site = Site.new(guardian)
json = MultiJson.dump(SiteSerializer.new(site, root: false, scope: guardian))
if guardian.anonymous?
Discourse.redis.multi do |transaction|
transaction.setex "site_json", 1800, json
transaction.set "site_json_seq", seq
transaction.set "site_json_version", Discourse.git_version
end
end
json
end
SITE_JSON_CHANNEL = "/site_json"
def self.clear_anon_cache!
# publishing forces the sequence up
# the cache is validated based on the sequence
MessageBus.publish(SITE_JSON_CHANNEL, "")
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end
end