discourse/lib/discourse_tagging.rb

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module DiscourseTagging
TAGS_FIELD_NAME = "tags"
TAGS_FILTER_REGEXP = /[<\\\/\>\#\?\&\s]/
# class Engine < ::Rails::Engine
# engine_name "discourse_tagging"
# isolate_namespace DiscourseTagging
# end
def self.tag_topic_by_names(topic, guardian, tag_names_arg)
if SiteSetting.tagging_enabled
tag_names = DiscourseTagging.tags_for_saving(tag_names_arg, guardian) || []
old_tag_names = topic.tags.map(&:name) || []
new_tag_names = tag_names - old_tag_names
removed_tag_names = old_tag_names - tag_names
# Protect staff-only tags
unless guardian.is_staff?
staff_tags = DiscourseTagging.staff_only_tags(new_tag_names)
if staff_tags.present?
topic.errors[:base] << I18n.t("tags.staff_tag_disallowed", tag: staff_tags.join(" "))
return false
end
staff_tags = DiscourseTagging.staff_only_tags(removed_tag_names)
if staff_tags.present?
topic.errors[:base] << I18n.t("tags.staff_tag_remove_disallowed", tag: staff_tags.join(" "))
return false
end
end
if tag_names.present?
category = topic.category
tags = filter_allowed_tags(Tag.where(name: tag_names), guardian, { for_input: true, category: category }).to_a
if tags.size < tag_names.size && (category.nil? || category.tags.count == 0)
tag_names.each do |name|
unless Tag.where(name: name).exists?
tags << Tag.create(name: name)
end
end
end
auto_notify_for(tags, topic)
topic.tags = tags
else
auto_notify_for([], topic)
topic.tags = []
end
end
true
end
# Options:
# term: a search term to filter tags by name
# for_input: result is for an input field, so only show permitted tags
# category: a Category to which the object being tagged belongs
def self.filter_allowed_tags(query, guardian, opts={})
term = opts[:term]
if term.present?
term.gsub!(/[^a-z0-9\.\-\_]*/, '')
term.gsub!("_", "\\_")
query = query.where('tags.name like ?', "%#{term}%")
end
if opts[:for_input]
unless guardian.is_staff?
staff_tag_names = SiteSetting.staff_tags.split("|")
query = query.where('tags.name NOT IN (?)', staff_tag_names) if staff_tag_names.present?
end
# Filters for category-specific tags:
if opts[:category] && (opts[:category].tags.count > 0 || opts[:category].tag_groups.count > 0)
if opts[:category].tags.count > 0 && opts[:category].tag_groups.count > 0
tag_group_ids = opts[:category].tag_groups.pluck(:id)
query = query.where(
"tags.id IN (SELECT tag_id FROM category_tags WHERE category_id = ?
UNION
SELECT tag_id FROM tag_group_memberships WHERE tag_group_id = ?)",
opts[:category].id, tag_group_ids
)
elsif opts[:category].tags.count > 0
query = query.where("tags.id IN (SELECT tag_id FROM category_tags WHERE category_id = ?)", opts[:category].id)
else # opts[:category].tag_groups.count > 0
tag_group_ids = opts[:category].tag_groups.pluck(:id)
query = query.where("tags.id IN (SELECT tag_id FROM tag_group_memberships WHERE tag_group_id = ?)", tag_group_ids)
end
else
# exclude tags that are restricted to other categories
if CategoryTag.exists?
query = query.where("tags.id NOT IN (SELECT tag_id FROM category_tags)")
end
if CategoryTagGroup.exists?
tag_group_ids = CategoryTagGroup.pluck(:tag_group_id).uniq
query = query.where("tags.id NOT IN (SELECT tag_id FROM tag_group_memberships WHERE tag_group_id = ?)", tag_group_ids)
end
end
end
query
end
def self.auto_notify_for(tags, topic)
TagUser.auto_watch_new_topic(topic, tags)
TagUser.auto_track_new_topic(topic, tags)
end
def self.clean_tag(tag)
tag.downcase.strip[0...SiteSetting.max_tag_length].gsub(TAGS_FILTER_REGEXP, '')
end
def self.staff_only_tags(tags)
return nil if tags.nil?
staff_tags = SiteSetting.staff_tags.split("|")
tag_diff = tags - staff_tags
tag_diff = tags - tag_diff
tag_diff.present? ? tag_diff : nil
end
def self.tags_for_saving(tags, guardian)
return [] unless guardian.can_tag_topics?
return unless tags.present?
tag_names = tags.map {|t| clean_tag(t) }
tag_names.delete_if {|t| t.blank? }
tag_names.uniq!
# If the user can't create tags, remove any tags that don't already exist
unless guardian.can_create_tag?
tag_names = Tag.where(name: tag_names).pluck(:name)
end
return tag_names[0...SiteSetting.max_tags_per_topic]
end
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def self.add_or_create_tags_by_name(taggable, tag_names_arg)
tag_names = DiscourseTagging.tags_for_saving(tag_names_arg, Guardian.new(Discourse.system_user)) || []
if taggable.tags.pluck(:name).sort != tag_names.sort
taggable.tags = Tag.where(name: tag_names).all
if taggable.tags.size < tag_names.size
new_tag_names = tag_names - taggable.tags.map(&:name)
new_tag_names.each do |name|
taggable.tags << Tag.create(name: name)
end
end
end
end
# TODO: this is unused?
def self.notification_key(tag_id)
"tags_notification:#{tag_id}"
end
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# TODO: this is unused?
def self.muted_tags(user)
return [] unless user
UserCustomField.where(user_id: user.id, value: TopicUser.notification_levels[:muted]).pluck(:name).map { |x| x[0,17] == "tags_notification" ? x[18..-1] : nil}.compact
end
end