discourse/lib/topics_filter.rb

565 lines
16 KiB
Ruby

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