312 lines
8.8 KiB
Ruby
312 lines
8.8 KiB
Ruby
# frozen_string_literal: true
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class SearchIndexer
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POST_INDEX_VERSION = 4
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MIN_POST_REINDEX_VERSION = 3
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TOPIC_INDEX_VERSION = 3
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CATEGORY_INDEX_VERSION = 3
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USER_INDEX_VERSION = 3
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TAG_INDEX_VERSION = 3
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REINDEX_VERSION = 0
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def self.disable
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@disabled = true
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end
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def self.enable
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@disabled = false
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end
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def self.scrub_html_for_search(html, strip_diacritics: SiteSetting.search_ignore_accents)
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HtmlScrubber.scrub(html, strip_diacritics: strip_diacritics)
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end
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def self.update_index(table: , id: , raw_data:)
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search_data = raw_data.map do |data|
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Search.prepare_data(data || "", :index)
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end
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table_name = "#{table}_search_data"
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foreign_key = "#{table}_id"
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# for user login and name use "simple" lowercase stemmer
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stemmer = table == "user" ? "simple" : Search.ts_config
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ranked_index = <<~SQL
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setweight(to_tsvector('#{stemmer}', coalesce(:a,'')), 'A') ||
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setweight(to_tsvector('#{stemmer}', coalesce(:b,'')), 'B') ||
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setweight(to_tsvector('#{stemmer}', coalesce(:c,'')), 'C') ||
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setweight(to_tsvector('#{stemmer}', coalesce(:d,'')), 'D')
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SQL
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ranked_params = {
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a: search_data[0],
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b: search_data[1],
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c: search_data[2],
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d: search_data[3],
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}
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tsvector = DB.query_single("SELECT #{ranked_index}", ranked_params)[0]
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additional_lexemes = []
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tsvector.scan(/'(([a-zA-Z0-9]+\.)+[a-zA-Z0-9]+)'\:([\w+,]+)/).reduce(additional_lexemes) do |array, (lexeme, _, positions)|
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count = 0
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if lexeme !~ /^(\d+\.)?(\d+\.)*(\*|\d+)$/
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loop do
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count += 1
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break if count >= 10 # Safeguard here to prevent infinite loop when a term has many dots
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term, _, remaining = lexeme.partition(".")
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break if remaining.blank?
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array << "'#{remaining}':#{positions}"
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lexeme = remaining
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end
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end
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array
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end
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tsvector = "#{tsvector} #{additional_lexemes.join(' ')}"
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indexed_data =
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if table.to_s == "post"
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clean_post_raw_data!(ranked_params[:d])
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else
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search_data.select { |d| d.length > 0 }.join(' ')
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end
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params = {
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raw_data: indexed_data,
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id: id,
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locale: SiteSetting.default_locale,
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version: const_get("#{table.upcase}_INDEX_VERSION"),
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tsvector: tsvector,
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}
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# Would be nice to use AR here but not sure how to execut Postgres functions
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# when inserting data like this.
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rows = DB.exec(<<~SQL, params)
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UPDATE #{table_name}
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SET
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raw_data = :raw_data,
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locale = :locale,
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search_data = (:tsvector)::tsvector,
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version = :version
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WHERE #{foreign_key} = :id
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SQL
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if rows == 0
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DB.exec(<<~SQL, params)
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INSERT INTO #{table_name}
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(#{foreign_key}, search_data, locale, raw_data, version)
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VALUES (:id, (:tsvector)::tsvector, :locale, :raw_data, :version)
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SQL
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end
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rescue
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# TODO is there any way we can safely avoid this?
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# best way is probably pushing search indexer into a dedicated process so it no longer happens on save
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# instead in the post processor
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end
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def self.update_topics_index(topic_id, title, cooked)
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scrubbed_cooked = scrub_html_for_search(cooked)[0...Topic::MAX_SIMILAR_BODY_LENGTH]
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# a bit inconsitent that we use title as A and body as B when in
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# the post index body is D
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update_index(table: 'topic', id: topic_id, raw_data: [title, scrubbed_cooked])
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end
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def self.update_posts_index(post_id, topic_title, category_name, topic_tags, cooked)
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update_index(table: 'post', id: post_id, raw_data: [topic_title, category_name, topic_tags, scrub_html_for_search(cooked)])
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end
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def self.update_users_index(user_id, username, name)
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update_index(table: 'user', id: user_id, raw_data: [username, name])
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end
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def self.update_categories_index(category_id, name)
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update_index(table: 'category', id: category_id, raw_data: [name])
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end
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def self.update_tags_index(tag_id, name)
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update_index(table: 'tag', id: tag_id, raw_data: [name.downcase])
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end
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def self.queue_category_posts_reindex(category_id)
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return if @disabled
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DB.exec(<<~SQL, category_id: category_id, version: REINDEX_VERSION)
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UPDATE post_search_data
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SET version = :version
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FROM posts
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INNER JOIN topics ON posts.topic_id = topics.id
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INNER JOIN categories ON topics.category_id = categories.id
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WHERE post_search_data.post_id = posts.id
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AND categories.id = :category_id
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SQL
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end
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def self.queue_post_reindex(topic_id)
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return if @disabled
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DB.exec(<<~SQL, topic_id: topic_id, version: REINDEX_VERSION)
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UPDATE post_search_data
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SET version = :version
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FROM posts
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WHERE post_search_data.post_id = posts.id
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AND posts.topic_id = :topic_id
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SQL
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end
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def self.index(obj, force: false)
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return if @disabled
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category_name = nil
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tag_names = nil
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topic = nil
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if Topic === obj
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topic = obj
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elsif Post === obj
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topic = obj.topic
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end
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category_name = topic.category&.name if topic
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if topic
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tags = topic.tags.select(:id, :name).to_a
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if tags.present?
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tag_names = (tags.map(&:name) + Tag.where(target_tag_id: tags.map(&:id)).pluck(:name)).join(' ')
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end
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end
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if Post === obj && obj.raw.present? &&
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(
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obj.saved_change_to_cooked? ||
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obj.saved_change_to_topic_id? ||
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force
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)
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if topic
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SearchIndexer.update_posts_index(obj.id, topic.title, category_name, tag_names, obj.cooked)
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SearchIndexer.update_topics_index(topic.id, topic.title, obj.cooked) if obj.is_first_post?
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end
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end
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if User === obj && (obj.saved_change_to_username? || obj.saved_change_to_name? || force)
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SearchIndexer.update_users_index(obj.id, obj.username_lower || '', obj.name ? obj.name.downcase : '')
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end
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if Topic === obj && (obj.saved_change_to_title? || force)
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if obj.posts
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if post = obj.posts.find_by(post_number: 1)
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SearchIndexer.update_posts_index(post.id, obj.title, category_name, tag_names, post.cooked)
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SearchIndexer.update_topics_index(obj.id, obj.title, post.cooked)
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end
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end
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end
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if Category === obj && (obj.saved_change_to_name? || force)
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SearchIndexer.update_categories_index(obj.id, obj.name)
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end
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if Tag === obj && (obj.saved_change_to_name? || force)
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SearchIndexer.update_tags_index(obj.id, obj.name)
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end
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end
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def self.clean_post_raw_data!(raw_data)
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urls = Set.new
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raw_data.scan(Discourse::Utils::URI_REGEXP) { urls << $& }
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urls.each do |url|
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begin
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case File.extname(URI(url).path || "")
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when Oneboxer::VIDEO_REGEX
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raw_data.gsub!(url, I18n.t("search.video"))
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when Oneboxer::AUDIO_REGEX
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raw_data.gsub!(url, I18n.t("search.audio"))
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end
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rescue URI::InvalidURIError
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end
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end
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raw_data
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end
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private_class_method :clean_post_raw_data!
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class HtmlScrubber < Nokogiri::XML::SAX::Document
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attr_reader :scrubbed
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def initialize(strip_diacritics: false)
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@scrubbed = +""
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@strip_diacritics = strip_diacritics
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end
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def self.scrub(html, strip_diacritics: false)
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return +"" if html.blank?
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document = Nokogiri::HTML5("<div>#{html}</div>", nil, Encoding::UTF_8.to_s)
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nodes = document.css(
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"div.#{CookedPostProcessor::LIGHTBOX_WRAPPER_CSS_CLASS}"
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)
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if nodes.present?
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nodes.each do |node|
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node.traverse do |child_node|
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next if child_node == node
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if %w{a img}.exclude?(child_node.name)
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child_node.remove
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elsif child_node.name == "a"
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ATTRIBUTES.each do |attribute|
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child_node.remove_attribute(attribute)
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end
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end
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end
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end
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end
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document.css("img[class='emoji']").each do |node|
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node.remove_attribute("alt")
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end
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document.css("a[href]").each do |node|
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if node["href"] == node.text || MENTION_CLASSES.include?(node["class"])
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node.remove_attribute("href")
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end
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end
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me = new(strip_diacritics: strip_diacritics)
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Nokogiri::HTML::SAX::Parser.new(me).parse(document.to_html)
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me.scrubbed.squish
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end
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MENTION_CLASSES ||= %w{mention mention-group}
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ATTRIBUTES ||= %w{alt title href data-youtube-title}
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def start_element(_name, attributes = [])
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attributes = Hash[*attributes.flatten]
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ATTRIBUTES.each do |attribute_name|
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if attributes[attribute_name].present? &&
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!(
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attribute_name == "href" &&
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UrlHelper.is_local(attributes[attribute_name])
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)
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characters(attributes[attribute_name])
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end
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end
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end
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def characters(str)
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str = Search.strip_diacritics(str) if @strip_diacritics
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scrubbed << " #{str} "
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end
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end
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end
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