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# frozen_string_literal: true
require "nokogiri"
require "asciidoctor/extensions/asciidoctor_kroki/extension"
module Banzai
module Filter
# HTML that replaces all diagrams supported by Kroki with the corresponding img tags.
# If the source content is large then the hidden attribute is added to the img tag.
class KrokiFilter < HTML::Pipeline::Filter
MAX_CHARACTER_LIMIT = 2000
def call
return doc unless settings.kroki_enabled
diagram_selectors = ::Gitlab::Kroki.formats(settings)
.map { |diagram_type| %(pre[lang="#{diagram_type}"] > code) }
.join(', ')
xpath = Gitlab::Utils::Nokogiri.css_to_xpath(diagram_selectors)
return doc unless doc.at_xpath(xpath)
diagram_format = "svg"
doc.xpath(xpath).each do |node|
diagram_type = node.parent['lang']
diagram_src = node.content
image_src = create_image_src(diagram_type, diagram_format, diagram_src)
lazy_load = diagram_src.length > MAX_CHARACTER_LIMIT
other_attrs = lazy_load ? "hidden" : ""
img_tag = Nokogiri::HTML::DocumentFragment.parse(%(<img class="js-render-kroki" src="#{image_src}" #{other_attrs} />))
node.parent.replace(img_tag)
end
doc
end
private
def create_image_src(type, format, text)
::AsciidoctorExtensions::KrokiDiagram.new(type, format, text)
.get_diagram_uri(settings.kroki_url)
end
def settings
Gitlab::CurrentSettings.current_application_settings
end
end
end
end
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