537 lines
15 KiB
Ruby
537 lines
15 KiB
Ruby
# frozen_string_literal: true
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class TopicsFilter
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attr_reader :topic_notification_levels
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def initialize(guardian:, scope: Topic.all)
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@guardian = guardian
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@scope = scope
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@topic_notification_levels = Set.new
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end
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FILTER_ALIASES = { "categories" => "category", "tags" => "tag" }
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private_constant :FILTER_ALIASES
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def filter_from_query_string(query_string)
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return @scope if query_string.blank?
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filters = {}
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query_string.scan(
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/(?<key_prefix>(?:-|=|-=|=-))?(?<key>[\w-]+):(?<value>[^\s]+)/,
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) do |key_prefix, key, value|
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key = FILTER_ALIASES[key] || key
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filters[key] ||= {}
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filters[key]["key_prefixes"] ||= []
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filters[key]["key_prefixes"] << key_prefix
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filters[key]["values"] ||= []
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filters[key]["values"] << value
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end
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filters.each do |filter, hash|
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key_prefixes = hash["key_prefixes"]
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values = hash["values"]
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filter_values = extract_and_validate_value_for(filter, values)
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case filter
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when "activity-before"
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filter_by_activity(before: filter_values)
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when "activity-after"
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filter_by_activity(after: filter_values)
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when "category"
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filter_categories(values: key_prefixes.zip(filter_values))
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when "created-after"
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filter_by_created(after: filter_values)
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when "created-before"
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filter_by_created(before: filter_values)
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when "created-by"
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filter_created_by_user(usernames: filter_values.flat_map { |value| value.split(",") })
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when "in"
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filter_in(values: filter_values)
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when "latest-post-after"
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filter_by_latest_post(after: filter_values)
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when "latest-post-before"
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filter_by_latest_post(before: filter_values)
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when "likes-min"
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filter_by_number_of_likes(min: filter_values)
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when "likes-max"
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filter_by_number_of_likes(max: filter_values)
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when "likes-op-min"
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filter_by_number_of_likes_in_first_post(min: filter_values)
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when "likes-op-max"
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filter_by_number_of_likes_in_first_post(max: filter_values)
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when "order"
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order_by(values: filter_values)
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when "posts-min"
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filter_by_number_of_posts(min: filter_values)
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when "posts-max"
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filter_by_number_of_posts(max: filter_values)
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when "posters-min"
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filter_by_number_of_posters(min: filter_values)
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when "posters-max"
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filter_by_number_of_posters(max: filter_values)
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when "status"
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filter_values.each { |status| @scope = filter_status(status: status) }
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when "tag"
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filter_tags(values: key_prefixes.zip(filter_values))
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when "views-min"
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filter_by_number_of_views(min: filter_values)
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when "views-max"
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filter_by_number_of_views(max: filter_values)
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end
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end
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@scope
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end
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def self.add_filter_by_status(status, &blk)
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custom_status_filters[status] = blk
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end
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def self.custom_status_filters
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@custom_status_filters ||= {}
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end
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def filter_status(status:, category_id: nil)
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case status
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when "open"
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@scope = @scope.where("NOT topics.closed AND NOT topics.archived")
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when "closed"
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@scope = @scope.where("topics.closed")
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when "archived"
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@scope = @scope.where("topics.archived")
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when "listed"
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@scope = @scope.where("topics.visible")
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when "unlisted"
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@scope = @scope.where("NOT topics.visible")
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when "deleted"
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category = category_id.present? ? Category.find_by(id: category_id) : nil
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if @guardian.can_see_deleted_topics?(category)
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@scope = @scope.unscope(where: :deleted_at).where("topics.deleted_at IS NOT NULL")
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end
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when "public"
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@scope = @scope.joins(:category).where("NOT categories.read_restricted")
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else
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if custom_filter = TopicsFilter.custom_status_filters[status]
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@scope = custom_filter.call(@scope)
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end
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end
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@scope
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end
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private
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YYYY_MM_DD_REGEXP =
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/\A(?<year>[12][0-9]{3})-(?<month>0?[1-9]|1[0-2])-(?<day>0?[1-9]|[12]\d|3[01])\z/
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private_constant :YYYY_MM_DD_REGEXP
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def extract_and_validate_value_for(filter, values)
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case filter
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when "activity-before", "activity-after", "created-before", "created-after",
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"latest-post-before", "latest-post-after"
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value = values.last
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if match_data = value.match(YYYY_MM_DD_REGEXP)
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Time.zone.parse(
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"#{match_data[:year].to_i}-#{match_data[:month].to_i}-#{match_data[:day].to_i}",
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)
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end
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when "likes-min", "likes-max", "likes-op-min", "likes-op-max", "posts-min", "posts-max",
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"posters-min", "posters-max", "views-min", "views-max"
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value = values.last
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value if value =~ /\A\d+\z/
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when "order"
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values.flat_map { |value| value.split(",") }
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when "created-by"
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values.flat_map { |value| value.split(",").map { |username| username.delete_prefix("@") } }
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else
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values
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end
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end
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def filter_by_topic_range(column_name:, min: nil, max: nil, scope: nil)
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{ min => ">=", max => "<=" }.each do |value, operator|
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next if !value
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@scope = (scope || @scope).where("#{column_name} #{operator} ?", value)
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end
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end
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def filter_by_activity(before: nil, after: nil)
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filter_by_topic_range(column_name: "topics.bumped_at", min: after, max: before)
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end
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def filter_by_created(before: nil, after: nil)
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filter_by_topic_range(column_name: "topics.created_at", min: after, max: before)
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end
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def filter_by_latest_post(before: nil, after: nil)
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filter_by_topic_range(column_name: "topics.last_posted_at", min: after, max: before)
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end
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def filter_by_number_of_posts(min: nil, max: nil)
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filter_by_topic_range(column_name: "topics.posts_count", min:, max:)
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end
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def filter_by_number_of_posters(min: nil, max: nil)
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filter_by_topic_range(column_name: "topics.participant_count", min:, max:)
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end
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def filter_by_number_of_likes(min: nil, max: nil)
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filter_by_topic_range(column_name: "topics.like_count", min:, max:)
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end
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def filter_by_number_of_likes_in_first_post(min: nil, max: nil)
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filter_by_topic_range(
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column_name: "first_posts.like_count",
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min:,
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max:,
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scope: self.joins_first_posts(@scope),
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)
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end
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def filter_by_number_of_views(min: nil, max: nil)
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filter_by_topic_range(column_name: "views", min:, max:)
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end
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def filter_categories(values:)
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category_slugs = {
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include: {
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with_subcategories: [],
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without_subcategories: [],
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},
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exclude: {
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with_subcategories: [],
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without_subcategories: [],
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},
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}
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values.each do |key_prefix, value|
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exclude_categories = key_prefix&.include?("-")
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exclude_subcategories = key_prefix&.include?("=")
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value
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.scan(
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/\A(?<category_slugs>([\p{L}\p{N}\-:]+)(?<delimiter>[,])?([\p{L}\p{N}\-:]+)?(\k<delimiter>[\p{L}\p{N}\-:]+)*)\z/,
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)
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.each do |category_slugs_match, delimiter|
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slugs = category_slugs_match.split(delimiter)
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type = exclude_categories ? :exclude : :include
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subcategory_type = exclude_subcategories ? :without_subcategories : :with_subcategories
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category_slugs[type][subcategory_type].concat(slugs)
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end
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end
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include_category_ids = []
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if category_slugs[:include][:without_subcategories].present?
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include_category_ids =
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get_category_ids_from_slugs(
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category_slugs[:include][:without_subcategories],
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exclude_subcategories: true,
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)
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end
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if category_slugs[:include][:with_subcategories].present?
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include_category_ids.concat(
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get_category_ids_from_slugs(
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category_slugs[:include][:with_subcategories],
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exclude_subcategories: false,
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),
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)
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end
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if include_category_ids.present?
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@scope = @scope.where("topics.category_id IN (?)", include_category_ids)
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elsif category_slugs[:include].values.flatten.present?
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@scope = @scope.none
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return
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end
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exclude_category_ids = []
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if category_slugs[:exclude][:without_subcategories].present?
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exclude_category_ids =
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get_category_ids_from_slugs(
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category_slugs[:exclude][:without_subcategories],
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exclude_subcategories: true,
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)
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end
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if category_slugs[:exclude][:with_subcategories].present?
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exclude_category_ids.concat(
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get_category_ids_from_slugs(
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category_slugs[:exclude][:with_subcategories],
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exclude_subcategories: false,
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),
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)
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end
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if exclude_category_ids.present?
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@scope = @scope.where("topics.category_id NOT IN (?)", exclude_category_ids)
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end
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end
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def filter_created_by_user(usernames:)
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@scope =
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@scope.joins(:user).where(
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"users.username_lower IN (:usernames)",
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usernames: usernames.map(&:downcase),
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)
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end
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def filter_in(values:)
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values.uniq!
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if values.delete("pinned")
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@scope =
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@scope.where(
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"topics.pinned_at IS NOT NULL AND topics.pinned_until > topics.pinned_at AND ? < topics.pinned_until",
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Time.zone.now,
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)
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end
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if @guardian.user
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if values.delete("bookmarked")
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@scope =
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@scope.joins(:topic_users).where(
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"topic_users.bookmarked AND topic_users.user_id = ?",
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@guardian.user.id,
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)
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end
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if values.present?
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values.each do |value|
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value
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.split(",")
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.each do |topic_notification_level|
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if level = TopicUser.notification_levels[topic_notification_level.to_sym]
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@topic_notification_levels << level
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end
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end
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end
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@scope =
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@scope.joins(:topic_users).where(
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"topic_users.notification_level IN (:topic_notification_levels) AND topic_users.user_id = :user_id",
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topic_notification_levels: @topic_notification_levels.to_a,
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user_id: @guardian.user.id,
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)
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end
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elsif values.present?
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@scope = @scope.none
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end
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end
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def get_category_ids_from_slugs(slugs, exclude_subcategories: false)
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category_ids = Category.ids_from_slugs(slugs)
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category_ids =
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Category
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.where(id: category_ids)
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.filter { |category| @guardian.can_see_category?(category) }
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.map(&:id)
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if !exclude_subcategories
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category_ids = category_ids.flat_map { |category_id| Category.subcategory_ids(category_id) }
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end
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category_ids
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end
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# Accepts an array of tag names and returns an array of tag ids and the tag ids of aliases for the tag names which the user can see.
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# If a block is given, it will be called with the tag ids and alias tag ids as arguments.
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def tag_ids_from_tag_names(tag_names)
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tag_ids, alias_tag_ids =
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DiscourseTagging
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.filter_visible(Tag, @guardian)
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.where_name(tag_names)
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.pluck(:id, :target_tag_id)
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.transpose
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tag_ids ||= []
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alias_tag_ids ||= []
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yield(tag_ids, alias_tag_ids) if block_given?
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all_tag_ids = tag_ids.concat(alias_tag_ids)
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all_tag_ids.compact!
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all_tag_ids.uniq!
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all_tag_ids
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end
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def filter_tags(values:)
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return if !SiteSetting.tagging_enabled?
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exclude_all_tags = []
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exclude_any_tags = []
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include_any_tags = []
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include_all_tags = []
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values.each do |key_prefix, value|
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break if key_prefix && key_prefix != "-"
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value.scan(
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/\A(?<tag_names>([\p{N}\p{L}\-]+)(?<delimiter>[,+])?([\p{N}\p{L}\-]+)?(\k<delimiter>[\p{N}\p{L}\-]+)*)\z/,
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) do |tag_names, delimiter|
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match_all =
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if delimiter == ","
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false
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else
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true
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end
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(
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case [key_prefix, match_all]
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in ["-", true]
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exclude_all_tags
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in ["-", false]
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exclude_any_tags
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in [nil, true]
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include_all_tags
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in [nil, false]
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include_any_tags
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end
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).concat(tag_names.split(delimiter))
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end
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end
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if exclude_all_tags.present?
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exclude_topics_with_all_tags(tag_ids_from_tag_names(exclude_all_tags))
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end
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if exclude_any_tags.present?
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exclude_topics_with_any_tags(tag_ids_from_tag_names(exclude_any_tags))
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end
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if include_any_tags.present?
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include_topics_with_any_tags(tag_ids_from_tag_names(include_any_tags))
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end
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if include_all_tags.present?
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has_invalid_tags = false
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all_tag_ids =
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tag_ids_from_tag_names(include_all_tags) do |tag_ids, _|
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has_invalid_tags = tag_ids.length < include_all_tags.length
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end
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if has_invalid_tags
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@scope = @scope.none
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else
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include_topics_with_all_tags(all_tag_ids)
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end
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end
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end
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def topic_tags_alias
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@topic_tags_alias ||= 0
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"tt#{@topic_tags_alias += 1}"
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end
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def exclude_topics_with_all_tags(tag_ids)
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where_clause = []
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tag_ids.each do |tag_id|
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sql_alias = "tt#{topic_tags_alias}"
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@scope =
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@scope.joins(
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"LEFT JOIN topic_tags #{sql_alias} ON #{sql_alias}.topic_id = topics.id AND #{sql_alias}.tag_id = #{tag_id}",
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)
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where_clause << "#{sql_alias}.topic_id IS NULL"
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end
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@scope = @scope.where(where_clause.join(" OR "))
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end
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def exclude_topics_with_any_tags(tag_ids)
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@scope =
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@scope.where(
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"topics.id NOT IN (SELECT DISTINCT topic_id FROM topic_tags WHERE topic_tags.tag_id IN (?))",
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tag_ids,
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)
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end
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def include_topics_with_all_tags(tag_ids)
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tag_ids.each do |tag_id|
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sql_alias = topic_tags_alias
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@scope =
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@scope.joins(
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"INNER JOIN topic_tags #{sql_alias} ON #{sql_alias}.topic_id = topics.id AND #{sql_alias}.tag_id = #{tag_id}",
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)
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end
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end
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def include_topics_with_any_tags(tag_ids)
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sql_alias = topic_tags_alias
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@scope =
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@scope
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.joins("INNER JOIN topic_tags #{sql_alias} ON #{sql_alias}.topic_id = topics.id")
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.where("#{sql_alias}.tag_id IN (?)", tag_ids)
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.distinct(:id)
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end
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ORDER_BY_MAPPINGS = {
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"activity" => {
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column: "topics.bumped_at",
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},
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"category" => {
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column: "categories.name",
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scope: -> { @scope.joins(:category) },
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},
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"created" => {
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column: "topics.created_at",
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},
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"latest-post" => {
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column: "topics.last_posted_at",
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},
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"likes" => {
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column: "topics.like_count",
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},
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"likes-op" => {
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column: "first_posts.like_count",
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scope: -> { joins_first_posts(@scope) },
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},
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"posters" => {
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column: "topics.participant_count",
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},
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"title" => {
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column: "LOWER(topics.title)",
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},
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"views" => {
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column: "topics.views",
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},
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}
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private_constant :ORDER_BY_MAPPINGS
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ORDER_BY_REGEXP = /\A(?<order_by>#{ORDER_BY_MAPPINGS.keys.join("|")})(?<asc>-asc)?\z/
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private_constant :ORDER_BY_REGEXP
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def order_by(values:)
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values.each do |value|
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|
match_data = value.match(ORDER_BY_REGEXP)
|
|
|
|
if match_data && column_name = ORDER_BY_MAPPINGS.dig(match_data[:order_by], :column)
|
|
if scope = ORDER_BY_MAPPINGS.dig(match_data[:order_by], :scope)
|
|
@scope = instance_exec(&scope)
|
|
end
|
|
|
|
@scope = @scope.order("#{column_name} #{match_data[:asc] ? "ASC" : "DESC"}")
|
|
end
|
|
end
|
|
end
|
|
|
|
def joins_first_posts(scope)
|
|
scope.joins(
|
|
"INNER JOIN posts AS first_posts ON first_posts.topic_id = topics.id AND first_posts.post_number = 1",
|
|
)
|
|
end
|
|
end
|