lib/redmine/wiki_formatting/common_mark/external_links_filter.rb
# 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.
require 'uri'
module Redmine
module WikiFormatting
module CommonMark
# adds class="external" to external links, and class="email" to mailto
# links
class ExternalLinksFilter < HTML::Pipeline::Filter
def call
doc.search("a").each do |node|
url = node["href"]
next unless url
next if url.starts_with?("/") || url.starts_with?("#") || !url.include?(':')
scheme = begin
URI.parse(url).scheme
rescue
nil
end
next if scheme.blank?
klass = node["class"].presence
node["class"] = [
klass,
(scheme == "mailto" ? "email" : "external")
].compact.join " "
if node["target"].present? && scheme != "mailto"
rel = node["rel"]&.split || []
rel << "noopener"
node["rel"] = rel.join(" ")
end
end
doc
end
end
end
end
end