Add latest changes from gitlab-org/security/gitlab@13-12-stable-ee

1 files changed, 24 insertions, 0 deletions

diff --git a/lib/gitlab/utils/nokogiri.rb b/lib/gitlab/utils/nokogiri.rb
new file mode 100644
index 00000000000..4b37bb7e5ea
--- /dev/null
+++ b/lib/gitlab/utils/nokogiri.rb
@@ -0,0 +1,24 @@
+# frozen_string_literal: true
+
+module Gitlab
+  module Utils
+    class Nokogiri
+      class << self
+        # Use Nokogiri to convert a css selector into an xpath selector.
+        # Nokogiri can use css selectors with `doc.search()`.  However
+        # for large node trees, it is _much_ slower than using xpath,
+        # by several orders of magnitude.
+        # https://gitlab.com/gitlab-org/gitlab/-/issues/329186
+        def css_to_xpath(css)
+          xpath = ::Nokogiri::CSS.xpath_for(css)
+
+          # Due to https://github.com/sparklemotion/nokogiri/issues/572,
+          # we remove the leading `//` and add `descendant-or-self::`
+          # in order to ensure we're searching from this node and all
+          # descendants.
+          xpath.map { |t| "descendant-or-self::#{t[2..-1]}" }.join('|')
+        end
+      end
+    end
+  end
+end