discourse/lib/discourse_tagging.rb

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# frozen_string_literal: true
module DiscourseTagging
TAGS_FIELD_NAME ||= "tags"
TAGS_FILTER_REGEXP ||= /[\/\?#\[\]@!\$&'\(\)\*\+,;=\.%\\`^\s|\{\}"<>]+/ # /?#[]@!$&'()*+,;=.%\`^|{}"<>
TAGS_STAFF_CACHE_KEY ||= "staff_tag_names"
TAG_GROUP_TAG_IDS_SQL ||= <<-SQL
SELECT tag_id
FROM tag_group_memberships tgm
INNER JOIN tag_groups tg
ON tgm.tag_group_id = tg.id
SQL
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def self.tag_topic_by_names(topic, guardian, tag_names_arg, append: false)
if guardian.can_tag?(topic)
tag_names = DiscourseTagging.tags_for_saving(tag_names_arg, guardian) || []
if !tag_names.empty?
Tag.where_name(tag_names).joins(:target_tag).includes(:target_tag).each do |tag|
tag_names[tag_names.index(tag.name)] = tag.target_tag.name
end
end
# tags currently on the topic
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old_tag_names = topic.tags.pluck(:name) || []
# tags we're trying to add to the topic
new_tag_names = tag_names - old_tag_names
# tag names being removed from the topic
removed_tag_names = old_tag_names - tag_names
# tag names which are visible, but not usable, by *some users*
readonly_tags = DiscourseTagging.readonly_tag_names(guardian)
# tags names which are not visible or usable by this user
hidden_tags = DiscourseTagging.hidden_tag_names(guardian)
# tag names which ARE permitted by *this user*
permitted_tags = DiscourseTagging.permitted_tag_names(guardian)
# If this user has explicit permission to use certain tags,
# we need to ensure those tags are removed from the list of
# restricted tags
if permitted_tags.present?
readonly_tags = readonly_tags - permitted_tags
end
# visible, but not usable, tags this user is trying to use
disallowed_tags = new_tag_names & readonly_tags
# hidden tags this user is trying to use
disallowed_tags += new_tag_names & hidden_tags
if disallowed_tags.present?
topic.errors.add(:base, I18n.t("tags.restricted_tag_disallowed", tag: disallowed_tags.join(" ")))
return false
end
removed_readonly_tags = removed_tag_names & readonly_tags
if removed_readonly_tags.present?
topic.errors.add(:base, I18n.t("tags.restricted_tag_remove_disallowed", tag: removed_readonly_tags.join(" ")))
return false
end
tag_names += removed_tag_names & hidden_tags
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category = topic.category
tag_names = tag_names + old_tag_names if append
if tag_names.present?
# guardian is explicitly nil cause we don't want to strip all
# staff tags that already passed validation
tags = filter_allowed_tags(
nil, # guardian
for_topic: true,
category: category,
selected_tags: tag_names,
only_tag_names: tag_names
)
tags = Tag.where(id: tags.map(&:id)).all.to_a if tags.size > 0
if tags.size < tag_names.size && (category.nil? || category.allow_global_tags || (category.tags.count == 0 && category.tag_groups.count == 0))
tag_names.each do |name|
unless Tag.where_name(name).exists?
tags << Tag.create(name: name)
end
end
end
# add missing mandatory parent tags
tag_ids = tags.map(&:id)
parent_tags_map = DB.query("
SELECT tgm.tag_id, tg.parent_tag_id
FROM tag_groups tg
INNER JOIN tag_group_memberships tgm
ON tgm.tag_group_id = tg.id
WHERE tg.parent_tag_id IS NOT NULL
AND tgm.tag_id IN (?)
", tag_ids).inject({}) do |h, v|
h[v.tag_id] ||= []
h[v.tag_id] << v.parent_tag_id
h
end
missing_parent_tag_ids = parent_tags_map.map do |_, parent_tag_ids|
(tag_ids & parent_tag_ids).size == 0 ? parent_tag_ids.first : nil
end.compact.uniq
unless missing_parent_tag_ids.empty?
tags = tags + Tag.where(id: missing_parent_tag_ids).all
end
return false unless validate_min_required_tags_for_category(guardian, topic, category, tags)
return false unless validate_required_tags_from_group(guardian, topic, category, tags)
if tags.size == 0
topic.errors.add(:base, I18n.t("tags.forbidden.invalid", count: new_tag_names.size))
return false
end
topic.tags = tags
else
return false unless validate_min_required_tags_for_category(guardian, topic, category)
return false unless validate_required_tags_from_group(guardian, topic, category)
topic.tags = []
end
topic.tags_changed = true
DiscourseEvent.trigger(
:topic_tags_changed,
topic, old_tag_names: old_tag_names, new_tag_names: topic.tags.map(&:name)
)
return true
end
false
end
def self.validate_min_required_tags_for_category(guardian, model, category, tags = [])
if !guardian.is_staff? &&
category &&
category.minimum_required_tags > 0 &&
tags.length < category.minimum_required_tags
model.errors.add(:base, I18n.t("tags.minimum_required_tags", count: category.minimum_required_tags))
false
else
true
end
end
def self.validate_required_tags_from_group(guardian, model, category, tags = [])
if !guardian.is_staff? &&
category &&
category.required_tag_group &&
(tags.length < category.min_tags_from_required_group ||
category.required_tag_group.tags.where("tags.id in (?)", tags.map(&:id)).count < category.min_tags_from_required_group)
model.errors.add(:base,
I18n.t(
"tags.required_tags_from_group",
count: category.min_tags_from_required_group,
tag_group_name: category.required_tag_group.name,
tags: category.required_tag_group.tags.pluck(:name).join(", ")
)
)
false
else
true
end
end
TAG_GROUP_RESTRICTIONS_SQL ||= <<~SQL
tag_group_restrictions AS (
SELECT t.id as tag_id, tgm.id as tgm_id, tg.id as tag_group_id, tg.parent_tag_id as parent_tag_id,
tg.one_per_topic as one_per_topic
FROM tags t
LEFT OUTER JOIN tag_group_memberships tgm ON tgm.tag_id = t.id /*and_name_like*/
LEFT OUTER JOIN tag_groups tg ON tg.id = tgm.tag_group_id
)
SQL
CATEGORY_RESTRICTIONS_SQL ||= <<~SQL
category_restrictions AS (
SELECT t.id as tag_id, ct.id as ct_id, ct.category_id as category_id
FROM tags t
INNER JOIN category_tags ct ON t.id = ct.tag_id /*and_name_like*/
UNION
SELECT t.id as tag_id, ctg.id as ctg_id, ctg.category_id as category_id
FROM tags t
INNER JOIN tag_group_memberships tgm ON tgm.tag_id = t.id /*and_name_like*/
INNER JOIN category_tag_groups ctg ON tgm.tag_group_id = ctg.tag_group_id
)
SQL
PERMITTED_TAGS_SQL ||= <<~SQL
permitted_tag_groups AS (
SELECT tg.id as tag_group_id, tgp.group_id as group_id, tgp.permission_type as permission_type
FROM tags t
INNER JOIN tag_group_memberships tgm ON tgm.tag_id = t.id /*and_name_like*/
INNER JOIN tag_groups tg ON tg.id = tgm.tag_group_id
INNER JOIN tag_group_permissions tgp
ON tg.id = tgp.tag_group_id /*and_group_ids*/
AND tgp.permission_type = #{TagGroupPermission.permission_types[:full]}
)
SQL
# Options:
# term: a search term to filter tags by name
# limit: max number of results
# category: a Category to which the object being tagged belongs
# for_input: result is for an input field, so only show permitted tags
# for_topic: results are for tagging a topic
# selected_tags: an array of tag names that are in the current selection
# only_tag_names: limit results to tags with these names
# exclude_synonyms: exclude synonyms from results
# order_search_results: result should be ordered for name search results
# order_popularity: order result by topic_count
def self.filter_allowed_tags(guardian, opts = {})
selected_tag_ids = opts[:selected_tags] ? Tag.where_name(opts[:selected_tags]).pluck(:id) : []
category = opts[:category]
category_has_restricted_tags = category ? (category.tags.count > 0 || category.tag_groups.count > 0) : false
# If guardian is nil, it means the caller doesn't want tags to be filtered
# based on guardian rules. Use the same rules as for staff users.
filter_for_non_staff = !guardian.nil? && !guardian.is_staff?
builder_params = {}
unless selected_tag_ids.empty?
builder_params[:selected_tag_ids] = selected_tag_ids
end
sql = +"WITH #{TAG_GROUP_RESTRICTIONS_SQL}, #{CATEGORY_RESTRICTIONS_SQL}"
if (opts[:for_input] || opts[:for_topic]) && filter_for_non_staff
sql << ", #{PERMITTED_TAGS_SQL} "
builder_params[:group_ids] = permitted_group_ids(guardian)
sql.gsub!("/*and_group_ids*/", "AND group_id IN (:group_ids)")
end
outer_join = category.nil? || category.allow_global_tags || !category_has_restricted_tags
distinct_clause = if opts[:order_popularity]
"DISTINCT ON (topic_count, name)"
elsif opts[:order_search_results] && opts[:term].present?
"DISTINCT ON (lower(name) = lower(:cleaned_term), topic_count, name)"
else
""
end
sql << <<~SQL
SELECT #{distinct_clause} t.id, t.name, t.topic_count, t.pm_topic_count,
tgr.tgm_id as tgm_id, tgr.tag_group_id as tag_group_id, tgr.parent_tag_id as parent_tag_id,
tgr.one_per_topic as one_per_topic, t.target_tag_id
FROM tags t
INNER JOIN tag_group_restrictions tgr ON tgr.tag_id = t.id
#{outer_join ? "LEFT OUTER" : "INNER"}
JOIN category_restrictions cr ON t.id = cr.tag_id
/*where*/
/*order_by*/
/*limit*/
SQL
builder = DB.build(sql)
if !opts[:for_topic] && builder_params[:selected_tag_ids]
builder.where("id NOT IN (:selected_tag_ids)")
end
if opts[:only_tag_names]
builder.where("LOWER(name) IN (:only_tag_names)")
builder_params[:only_tag_names] = opts[:only_tag_names].map(&:downcase)
end
# parent tag requirements
if opts[:for_input]
builder.where(
builder_params[:selected_tag_ids] ?
"tgm_id IS NULL OR parent_tag_id IS NULL OR parent_tag_id IN (:selected_tag_ids)" :
"tgm_id IS NULL OR parent_tag_id IS NULL"
)
end
if category && category_has_restricted_tags
builder.where(
category.allow_global_tags ? "category_id = ? OR category_id IS NULL" : "category_id = ?",
category.id
)
elsif category || opts[:for_input] || opts[:for_topic]
# tags not restricted to any categories
builder.where("category_id IS NULL")
end
if filter_for_non_staff && (opts[:for_input] || opts[:for_topic])
# exclude staff-only tag groups
builder.where("tag_group_id IS NULL OR tag_group_id IN (SELECT tag_group_id FROM permitted_tag_groups)")
end
term = opts[:term]
if term.present?
term = term.gsub("_", "\\_").downcase
builder.where("LOWER(name) LIKE :term")
builder_params[:cleaned_term] = term
builder_params[:term] = "%#{term}%"
sql.gsub!("/*and_name_like*/", "AND LOWER(t.name) LIKE :term")
else
sql.gsub!("/*and_name_like*/", "")
end
# show required tags for non-staff
# or for staff when
# - there are more available tags than the query limit
# - and no search term has been included
filter_required_tags = category&.required_tag_group && (filter_for_non_staff || (term.blank? && category&.required_tag_group&.tags.size >= opts[:limit].to_i))
if opts[:for_input] && filter_required_tags
required_tag_ids = category.required_tag_group.tags.pluck(:id)
if (required_tag_ids & selected_tag_ids).size < category.min_tags_from_required_group
builder.where("id IN (?)", required_tag_ids)
end
end
if filter_for_non_staff
group_ids = permitted_group_ids(guardian)
builder.where(<<~SQL, group_ids, group_ids)
id NOT IN (
(SELECT tgm.tag_id
FROM tag_group_permissions tgp
INNER JOIN tag_groups tg ON tgp.tag_group_id = tg.id
INNER JOIN tag_group_memberships tgm ON tg.id = tgm.tag_group_id
WHERE tgp.group_id NOT IN (?))
EXCEPT
(SELECT tgm.tag_id
FROM tag_group_permissions tgp
INNER JOIN tag_groups tg ON tgp.tag_group_id = tg.id
INNER JOIN tag_group_memberships tgm ON tg.id = tgm.tag_group_id
WHERE tgp.group_id IN (?))
)
SQL
end
if builder_params[:selected_tag_ids] && (opts[:for_input] || opts[:for_topic])
one_tag_per_group_ids = DB.query(<<~SQL, builder_params[:selected_tag_ids]).map(&:id)
SELECT DISTINCT(tg.id)
FROM tag_groups tg
INNER JOIN tag_group_memberships tgm ON tg.id = tgm.tag_group_id AND tgm.tag_id IN (?)
WHERE tg.one_per_topic
SQL
if !one_tag_per_group_ids.empty?
builder.where(
"tag_group_id IS NULL OR tag_group_id NOT IN (?) OR id IN (:selected_tag_ids)",
one_tag_per_group_ids
)
end
end
if opts[:exclude_synonyms]
builder.where("target_tag_id IS NULL")
end
if opts[:exclude_has_synonyms]
builder.where("id NOT IN (SELECT target_tag_id FROM tags WHERE target_tag_id IS NOT NULL)")
end
if opts[:limit]
if required_tag_ids && term.blank?
# override limit so all required tags are shown by default
builder.limit(required_tag_ids.size)
else
builder.limit(opts[:limit])
end
end
if opts[:order_popularity]
builder.order_by("topic_count DESC, name")
elsif opts[:order_search_results] && !term.blank?
builder.order_by("lower(name) = lower(:cleaned_term) DESC, topic_count DESC, name")
end
result = builder.query(builder_params).uniq { |t| t.id }
end
def self.filter_visible(query, guardian = nil)
guardian&.is_staff? ? query : query.where("tags.id NOT IN (#{hidden_tags_query.select(:id).to_sql})")
end
def self.hidden_tag_names(guardian = nil)
guardian&.is_staff? ? [] : hidden_tags_query.pluck(:name) - permitted_tag_names(guardian)
end
# most restrictive level of tag groups
def self.hidden_tags_query
query = Tag.joins(:tag_groups)
.where('tag_groups.id NOT IN (
SELECT tag_group_id
FROM tag_group_permissions
WHERE group_id = ?)',
Group::AUTO_GROUPS[:everyone]
)
query
end
def self.permitted_group_ids(guardian = nil)
group_ids = [Group::AUTO_GROUPS[:everyone]]
if guardian&.authenticated?
group_ids.concat(guardian.user.groups.pluck(:id))
end
group_ids
end
# read-only tags for this user
def self.readonly_tag_names(guardian = nil)
return [] if guardian&.is_staff?
query = Tag.joins(tag_groups: :tag_group_permissions)
.where('tag_group_permissions.permission_type = ?',
TagGroupPermission.permission_types[:readonly])
query.pluck(:name)
end
# explicit permissions to use these tags
def self.permitted_tag_names(guardian = nil)
query = Tag.joins(tag_groups: :tag_group_permissions)
.where('tag_group_permissions.group_id IN (?) AND tag_group_permissions.permission_type = ?',
permitted_group_ids(guardian),
TagGroupPermission.permission_types[:full]
)
query.pluck(:name).uniq
end
# middle level of tag group restrictions
def self.staff_tag_names
tag_names = Discourse.cache.read(TAGS_STAFF_CACHE_KEY)
if !tag_names
tag_names = Tag.joins(tag_groups: :tag_group_permissions)
.where('tag_group_permissions.group_id = ? AND tag_group_permissions.permission_type = ?',
Group::AUTO_GROUPS[:everyone],
TagGroupPermission.permission_types[:readonly]
).pluck(:name)
Discourse.cache.write(TAGS_STAFF_CACHE_KEY, tag_names, expires_in: 1.hour)
end
tag_names
end
def self.clear_cache!
Discourse.cache.delete(TAGS_STAFF_CACHE_KEY)
end
def self.clean_tag(tag)
tag = tag.dup
tag.downcase! if SiteSetting.force_lowercase_tags
tag.strip!
tag.gsub!(/[[:space:]]+/, '-')
tag.gsub!(/[^[:word:][:punct:]]+/, '')
tag.squeeze!('-')
tag.gsub!(TAGS_FILTER_REGEXP, '')
tag[0...SiteSetting.max_tag_length]
end
def self.tags_for_saving(tags_arg, guardian, opts = {})
return [] unless guardian.can_tag_topics? && tags_arg.present?
tag_names = Tag.where_name(tags_arg).pluck(:name)
if guardian.can_create_tag?
tag_names += (tags_arg - tag_names).map { |t| clean_tag(t) }
tag_names.delete_if { |t| t.blank? }
tag_names.uniq!
end
opts[:unlimited] ? tag_names : tag_names[0...SiteSetting.max_tags_per_topic]
end
def self.add_or_create_tags_by_name(taggable, tag_names_arg, opts = {})
tag_names = DiscourseTagging.tags_for_saving(tag_names_arg, Guardian.new(Discourse.system_user), opts) || []
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if taggable.tags.pluck(:name).sort != tag_names.sort
taggable.tags = Tag.where_name(tag_names).all
new_tag_names = taggable.tags.size < tag_names.size ? tag_names - taggable.tags.map(&:name) : []
taggable.tags << Tag.where(target_tag_id: taggable.tags.map(&:id)).all
new_tag_names.each do |name|
taggable.tags << Tag.create(name: name)
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end
end
end
# Returns true if all were added successfully, or an Array of the
# tags that failed to be added, with errors on each Tag.
def self.add_or_create_synonyms_by_name(target_tag, synonym_names)
tag_names = DiscourseTagging.tags_for_saving(synonym_names, Guardian.new(Discourse.system_user)) || []
tag_names -= [target_tag.name]
existing = Tag.where_name(tag_names).all
target_tag.synonyms << existing
(tag_names - target_tag.synonyms.map(&:name)).each do |name|
target_tag.synonyms << Tag.create(name: name)
end
successful = existing.select { |t| !t.errors.present? }
synonyms_ids = successful.map(&:id)
TopicTag.where(topic_id: target_tag.topics.with_deleted, tag_id: synonyms_ids).delete_all
TopicTag.where(tag_id: synonyms_ids).update_all(tag_id: target_tag.id)
Scheduler::Defer.later "Update tag topic counts" do
Tag.ensure_consistency!
end
(existing - successful).presence || true
end
def self.muted_tags(user)
return [] unless user
TagUser.lookup(user, :muted).joins(:tag).pluck('tags.name')
end
end