gitlab-org--gitlab-foss/app/uploaders/file_mover.rb

# frozen_string_literal: true

class FileMover
  attr_reader :secret, :file_name, :from_model, :to_model, :update_field

  def initialize(file_path, update_field = :description, from_model:, to_model:)
    @secret = File.split(File.dirname(file_path)).last
    @file_name = File.basename(file_path)
    @from_model = from_model
    @to_model = to_model
    @update_field = update_field
  end

  def execute
    return unless valid?

    move

    if update_markdown
      update_upload_model
      uploader.schedule_background_upload
    end
  end

  private

  def valid?
    Pathname.new(temp_file_path).realpath.to_path.start_with?(
      (Pathname(temp_file_uploader.root) + temp_file_uploader.base_dir).to_path
    )
  end

  def move
    FileUtils.mkdir_p(File.dirname(file_path))
    FileUtils.move(temp_file_path, file_path)
  end

  def update_markdown
    updated_text = to_model.read_attribute(update_field)
                           .gsub(temp_file_uploader.markdown_link, uploader.markdown_link)
    to_model.update_attribute(update_field, updated_text)
  rescue
    revert
    false
  end

  def update_upload_model
    return unless upload = temp_file_uploader.upload

    upload.update!(model_id: to_model.id, model_type: to_model.type)
  end

  def temp_file_path
    return @temp_file_path if @temp_file_path

    temp_file_uploader.retrieve_from_store!(file_name)

    @temp_file_path = temp_file_uploader.file.path
  end

  def file_path
    return @file_path if @file_path

    uploader.retrieve_from_store!(file_name)

    @file_path = uploader.file.path
  end

  def uploader
    @uploader ||= PersonalFileUploader.new(to_model, secret: secret)
  end

  def temp_file_uploader
    @temp_file_uploader ||= PersonalFileUploader.new(from_model, secret: secret)
  end

  def revert
    Rails.logger.warn("Markdown not updated, file move reverted for #{to_model}")

    FileUtils.move(file_path, temp_file_path)
  end
end