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# frozen_string_literal: true
require 'uri'
module Banzai
module Filter
class BaseRelativeLinkFilter < HTML::Pipeline::Filter
include Gitlab::Utils::StrongMemoize
CSS = 'a:not(.gfm), img:not(.gfm), video:not(.gfm), audio:not(.gfm)'
XPATH = Gitlab::Utils::Nokogiri.css_to_xpath(CSS).freeze
protected
def linkable_attributes
if Feature.enabled?(:optimize_linkable_attributes, project, default_enabled: :yaml)
# Nokorigi Nodeset#search performs badly for documents with many nodes
#
# Here we store fetched attributes in the shared variable "result"
# This variable is passed through the chain of filters and can be
# accessed by them
result[:linkable_attributes] ||= fetch_linkable_attributes
else
strong_memoize(:linkable_attributes) do
fetch_linkable_attributes
end
end
end
def relative_url_root
Gitlab.config.gitlab.relative_url_root.presence || '/'
end
def project
context[:project]
end
private
def unescape_and_scrub_uri(uri)
Addressable::URI.unescape(uri).scrub.delete("\0")
end
def fetch_linkable_attributes
attrs = []
attrs += doc.xpath(XPATH).flat_map do |el|
[el.attribute('href'), el.attribute('src'), el.attribute('data-src')]
end
attrs.reject { |attr| attr.blank? || attr.value.start_with?('//') }
end
end
end
end
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