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module Banzai
module Filter
# HTML Filter to add a `rel="nofollow"` attribute to external links
#
class ExternalLinkFilter < HTML::Pipeline::Filter
def call
doc.search('a').each do |node|
link = node.attr('href')
next unless link
# Skip non-HTTP(S) links
next unless link.start_with?('http')
# Skip internal links
next if link.start_with?(internal_url)
node.set_attribute('rel', 'nofollow')
end
doc
end
private
def internal_url
@internal_url ||= Gitlab.config.gitlab.url
end
end
end
end
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