# frozen_string_literal: true

# Redmine - project management software
# Copyright (C) 2006-  Jean-Philippe Lang
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

module Redmine
  module WikiFormatting
    # Combination of SanitizationFilter and ExternalLinksScrubber
    class HtmlSanitizer
      SANITIZER = Redmine::WikiFormatting::CommonMark::SanitizationFilter.new
      SCRUBBERS = [Redmine::WikiFormatting::CommonMark::ExternalLinksScrubber.new]

      def self.call(html)
        fragment = HtmlParser.parse(html)
        SANITIZER.call(fragment)

        scrubber = Loofah::Scrubber.new do |node|
          SCRUBBERS.each do |s|
            result = s.scrub(node)
            break result if result == Loofah::Scrubber::STOP
            break if node.parent.nil?
          end
        end

        fragment.scrub!(scrubber)
        fragment.to_s
      end
    end
  end
end
