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class NotesFinder
FETCH_OVERLAP = 5.seconds
# Used to filter Notes
# When used with target_type and target_id this returns notes specifically for the controller
#
# Arguments:
# current_user - which user check authorizations with
# project - which project to look for notes on
# params:
# target_type: string
# target_id: integer
# last_fetched_at: time
# search: string
#
def initialize(project, current_user, params = {})
@project = project
@current_user = current_user
@params = params
end
def execute
notes = init_collection
notes = since_fetch_at(notes)
notes.fresh
end
def target
return @target if defined?(@target)
target_type = @params[:target_type]
target_id = @params[:target_id]
return @target = nil unless target_type && target_id
@target =
if target_type == "commit"
if Ability.allowed?(@current_user, :download_code, @project)
@project.commit(target_id)
end
else
noteables_for_type(target_type).find(target_id)
end
end
private
def init_collection
if target
notes_on_target
else
notes_of_any_type
end
end
def notes_of_any_type
types = %w(commit issue merge_request snippet)
note_relations = types.map { |t| notes_for_type(t) }
note_relations.map! { |notes| search(notes) }
UnionFinder.new.find_union(note_relations, Note)
end
def noteables_for_type(noteable_type)
case noteable_type
when "issue"
IssuesFinder.new(@current_user, project_id: @project.id).execute
when "merge_request"
MergeRequestsFinder.new(@current_user, project_id: @project.id).execute
when "snippet", "project_snippet"
SnippetsFinder.new(@current_user, project: @project).execute
when "personal_snippet"
PersonalSnippet.all
else
raise 'invalid target_type'
end
end
def notes_for_type(noteable_type)
if noteable_type == "commit"
if Ability.allowed?(@current_user, :download_code, @project)
@project.notes.where(noteable_type: 'Commit')
else
Note.none
end
else
finder = noteables_for_type(noteable_type)
@project.notes.where(noteable_type: finder.base_class.name, noteable_id: finder.reorder(nil))
end
end
def notes_on_target
if target.respond_to?(:related_notes)
target.related_notes
else
target.notes
end
end
# Searches for notes matching the given query.
#
# This method uses ILIKE on PostgreSQL and LIKE on MySQL.
#
def search(notes)
query = @params[:search]
return notes unless query
pattern = "%#{query}%"
notes.where(Note.arel_table[:note].matches(pattern))
end
# Notes changed since last fetch
# Uses overlapping intervals to avoid worrying about race conditions
def since_fetch_at(notes)
return notes unless @params[:last_fetched_at]
# Default to 0 to remain compatible with old clients
last_fetched_at = Time.at(@params.fetch(:last_fetched_at, 0).to_i)
notes.updated_after(last_fetched_at - FETCH_OVERLAP)
end
end
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