discourse/lib/discourse_tagging.rb

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module DiscourseTagging
TAGS_FIELD_NAME = "tags"
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TAGS_FILTER_REGEXP = /[\/\?#\[\]@!\$&'\(\)\*\+,;=\.%\\`^\s|\{\}"<>]+/ # /?#[]@!$&'()*+,;=.%\`^|{}"<>
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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) || []
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old_tag_names = topic.tags.pluck(: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
tag_names = tag_names + old_tag_names if append
# guardian is explicitly nil cause we don't want to strip all
# staff tags that already passed validation
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tags = filter_allowed_tags(Tag.where(name: tag_names), nil, for_input: true,
category: category,
selected_tags: tag_names).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
topic.tags = tags
else
topic.tags = []
end
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topic.tags_changed = true
end
true
end
# Options:
# term: a search term to filter tags by name
# category: a Category to which the object being tagged belongs
# for_input: result is for an input field, so only show permitted tags
# selected_tags: an array of tag names that are in the current selection
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def self.filter_allowed_tags(query, guardian, opts = {})
term = opts[:term]
if term.present?
term.gsub!("_", "\\_")
term = clean_tag(term)
query = query.where('tags.name like ?', "%#{term}%")
end
# Filters for category-specific tags:
category = opts[:category]
if category && (category.tags.count > 0 || category.tag_groups.count > 0)
if category.tags.count > 0 && category.tag_groups.count > 0
tag_group_ids = 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 IN (?))",
category.id, tag_group_ids
)
elsif category.tags.count > 0
query = query.where("tags.id IN (SELECT tag_id FROM category_tags WHERE category_id = ?)", category.id)
else # category.tag_groups.count > 0
tag_group_ids = category.tag_groups.pluck(:id)
query = query.where("tags.id IN (SELECT tag_id FROM tag_group_memberships WHERE tag_group_id IN (?))", tag_group_ids)
end
elsif opts[:for_input] || category
# 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 IN (?))", tag_group_ids)
end
end
if opts[:for_input]
selected_tag_ids = opts[:selected_tags] ? Tag.where(name: opts[:selected_tags]).pluck(:id) : []
unless guardian.nil? || 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
# exclude tag groups that have a parent tag which is missing from selected_tags
select_sql = <<-SQL
SELECT tag_id
FROM tag_group_memberships tgm
INNER JOIN tag_groups tg
ON tgm.tag_group_id = tg.id
SQL
if selected_tag_ids.empty?
sql = "tags.id NOT IN (#{select_sql} WHERE tg.parent_tag_id IS NOT NULL)"
query = query.where(sql)
else
# One tag per group restriction
exclude_group_ids = TagGroup.where(one_per_topic: true)
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.joins(:tag_group_memberships)
.where('tag_group_memberships.tag_id in (?)', selected_tag_ids)
.pluck(:id)
if exclude_group_ids.empty?
sql = "tags.id NOT IN (#{select_sql} WHERE tg.parent_tag_id NOT IN (?))"
query = query.where(sql, selected_tag_ids)
else
# It's possible that the selected tags violate some one-tag-per-group restrictions,
# so filter them out by picking one from each group.
limit_tag_ids = TagGroupMembership.select('distinct on (tag_group_id) tag_id')
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.where(tag_id: selected_tag_ids)
.where(tag_group_id: exclude_group_ids)
.map(&:tag_id)
sql = "(tags.id NOT IN (#{select_sql} WHERE (tg.parent_tag_id NOT IN (?) OR tg.id in (?))) OR tags.id IN (?))"
query = query.where(sql, selected_tag_ids, exclude_group_ids, limit_tag_ids)
end
end
end
query
end
def self.clean_tag(tag)
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tag.downcase.strip
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.gsub(/\s+/, '-').squeeze('-')
.gsub(TAGS_FILTER_REGEXP, '')[0...SiteSetting.max_tag_length]
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
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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
return opts[:unlimited] ? tag_names : 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, 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
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
def self.muted_tags(user)
return [] unless user
TagUser.lookup(user, :muted).joins(:tag).pluck('tags.name')
end
end