debian-mirror-gitlab/app/models/concerns/mentionable.rb
2021-01-03 14:25:43 +05:30

251 lines
8.4 KiB
Ruby

# frozen_string_literal: true
# == Mentionable concern
#
# Contains functionality related to objects that can mention Users, Issues, MergeRequests, Commits or Snippets by
# GFM references.
#
# Used by Issue, Note, MergeRequest, and Commit.
#
module Mentionable
extend ActiveSupport::Concern
class_methods do
# Indicate which attributes of the Mentionable to search for GFM references.
def attr_mentionable(attr, options = {})
attr = attr.to_s
mentionable_attrs << [attr, options]
end
end
included do
# Accessor for attributes marked mentionable.
cattr_accessor :mentionable_attrs, instance_accessor: false do
[]
end
if self < Participable
participant -> (user, ext) { all_references(user, extractor: ext) }
end
end
# Returns the text used as the body of a Note when this object is referenced
#
# By default this will be the class name and the result of calling
# `to_reference` on the object.
def gfm_reference(from = nil)
# "MergeRequest" > "merge_request" > "Merge request" > "merge request"
friendly_name = self.class.to_s.underscore.humanize.downcase
"#{friendly_name} #{to_reference(from)}"
end
# The GFM reference to this Mentionable, which shouldn't be included in its #references.
def local_reference
self
end
def all_references(current_user = nil, extractor: nil)
# Use custom extractor if it's passed in the function parameters.
if extractor
extractors[current_user] = extractor
else
extractor = extractors[current_user] ||= Gitlab::ReferenceExtractor.new(project, current_user)
extractor.reset_memoized_values
end
self.class.mentionable_attrs.each do |attr, options|
text = __send__(attr) # rubocop:disable GitlabSecurity/PublicSend
options = options.merge(
cache_key: [self, attr],
author: author,
skip_project_check: skip_project_check?
).merge(mentionable_params)
cached_html = self.try(:updated_cached_html_for, attr.to_sym)
options[:rendered] = cached_html if cached_html
extractor.analyze(text, options)
end
extractor
end
def extractors
@extractors ||= {}
end
def mentioned_users(current_user = nil)
all_references(current_user).users
end
def store_mentions!
refs = all_references(self.author)
references = {}
references[:mentioned_users_ids] = refs.mentioned_users&.pluck(:id).presence
references[:mentioned_groups_ids] = refs.mentioned_groups&.pluck(:id).presence
references[:mentioned_projects_ids] = refs.mentioned_projects&.pluck(:id).presence
# One retry should be enough as next time `model_user_mention` should return the existing mention record, that
# threw the `ActiveRecord::RecordNotUnique` exception in first place.
self.class.safe_ensure_unique(retries: 1) do
user_mention = model_user_mention
# this may happen due to notes polymorphism, so noteable_id may point to a record that no longer exists
# as we cannot have FK on noteable_id
break if user_mention.blank?
user_mention.mentioned_users_ids = references[:mentioned_users_ids]
user_mention.mentioned_groups_ids = references[:mentioned_groups_ids]
user_mention.mentioned_projects_ids = references[:mentioned_projects_ids]
if user_mention.has_mentions?
user_mention.save!
else
user_mention.destroy!
end
end
true
end
def referenced_users
User.where(id: user_mentions.select("unnest(mentioned_users_ids)"))
end
def referenced_projects(current_user = nil)
Project.where(id: user_mentions.select("unnest(mentioned_projects_ids)")).public_or_visible_to_user(current_user)
end
def referenced_project_users(current_user = nil)
User.joins(:project_members).where(members: { source_id: referenced_projects(current_user) }).distinct
end
def referenced_groups(current_user = nil)
# TODO: IMPORTANT: Revisit before using it.
# Check DB data for max mentioned groups per mentionable:
#
# select issue_id, count(mentions_count.men_gr_id) gr_count from
# (select DISTINCT unnest(mentioned_groups_ids) as men_gr_id, issue_id
# from issue_user_mentions group by issue_id, mentioned_groups_ids) as mentions_count
# group by mentions_count.issue_id order by gr_count desc limit 10
Group.where(id: user_mentions.select("unnest(mentioned_groups_ids)")).public_or_visible_to_user(current_user)
end
def referenced_group_users(current_user = nil)
User.joins(:group_members).where(members: { source_id: referenced_groups }).distinct
end
def directly_addressed_users(current_user = nil)
all_references(current_user).directly_addressed_users
end
# Extract GFM references to other Mentionables from this Mentionable. Always excludes its #local_reference.
def referenced_mentionables(current_user = self.author)
return [] unless matches_cross_reference_regex?
refs = all_references(current_user)
# We're using this method instead of Array diffing because that requires
# both of the object's `hash` values to be the same, which may not be the
# case for otherwise identical Commit objects.
extracted_mentionables(refs).reject { |ref| ref == local_reference }
end
# Uses regex to quickly determine if mentionables might be referenced
# Allows heavy processing to be skipped
def matches_cross_reference_regex?
reference_pattern = if !project || project.default_issues_tracker?
ReferenceRegexes.default_pattern
else
ReferenceRegexes.external_pattern
end
self.class.mentionable_attrs.any? do |attr, _|
__send__(attr) =~ reference_pattern # rubocop:disable GitlabSecurity/PublicSend
end
end
# Create a cross-reference Note for each GFM reference to another Mentionable found in the +mentionable_attrs+.
def create_cross_references!(author = self.author, without = [])
refs = referenced_mentionables(author)
# We're using this method instead of Array diffing because that requires
# both of the object's `hash` values to be the same, which may not be the
# case for otherwise identical Commit objects.
refs.reject! { |ref| without.include?(ref) || cross_reference_exists?(ref) }
refs.each do |ref|
SystemNoteService.cross_reference(ref, local_reference, author)
end
end
# When a mentionable field is changed, creates cross-reference notes that
# don't already exist
def create_new_cross_references!(author = self.author)
changes = detect_mentionable_changes
return if changes.empty?
create_cross_references!(author)
end
private
def extracted_mentionables(refs)
refs.issues + refs.merge_requests + refs.commits
end
# Returns a Hash of changed mentionable fields
#
# Preference is given to the `changes` Hash, but falls back to
# `previous_changes` if it's empty (i.e., the changes have already been
# persisted).
#
# See ActiveModel::Dirty.
#
# Returns a Hash.
def detect_mentionable_changes
source = (changes.presence || previous_changes).dup
mentionable = self.class.mentionable_attrs.map { |attr, options| attr }
# Only include changed fields that are mentionable
source.select { |key, val| mentionable.include?(key) }
end
def any_mentionable_attributes_changed?
self.class.mentionable_attrs.any? do |attr|
saved_changes.key?(attr.first)
end
end
# Determine whether or not a cross-reference Note has already been created between this Mentionable and
# the specified target.
def cross_reference_exists?(target)
SystemNoteService.cross_reference_exists?(target, local_reference)
end
def skip_project_check?
false
end
def mentionable_params
{}
end
# User mention that is parsed from model description rather then its related notes.
# Models that have a descriprion attribute like Issue, MergeRequest, Epic, Snippet may have such a user mention.
# Other mentionable models like Commit, DesignManagement::Design, will never have such record as those do not have
# a description attribute.
#
# Using this method followed by a call to *save* may result in *ActiveRecord::RecordNotUnique* exception
# in a multithreaded environment. Make sure to use it within a *safe_ensure_unique* block.
def model_user_mention
user_mentions.where(note_id: nil).first_or_initialize
end
end
Mentionable.prepend_if_ee('EE::Mentionable')