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# frozen_string_literal: true
require 'nokogiri'
require 'asciidoctor/extensions/asciidoctor_kroki/version'
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
include ActionView::Helpers::TagHelper
MAX_CHARACTER_LIMIT = 2000
def call
return doc unless settings.kroki_enabled
diagram_selectors = ::Gitlab::Kroki.formats(settings)
.map do |diagram_type|
%(pre[lang="#{diagram_type}"] > code,
pre > code[lang="#{diagram_type}"])
end
.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'] || node['lang']
next unless diagram_selectors.include?(diagram_type)
diagram_src = node.content
image_src = create_image_src(diagram_type, diagram_format, diagram_src)
img_tag = Nokogiri::HTML::DocumentFragment.parse(content_tag(:img, nil, src: image_src))
img_tag = img_tag.children.first
next if img_tag.nil?
lazy_load = diagram_src.length > MAX_CHARACTER_LIMIT
img_tag.set_attribute('hidden', '') if lazy_load
img_tag.set_attribute('class', 'js-render-kroki')
img_tag.set_attribute('data-diagram', diagram_type)
img_tag.set_attribute('data-diagram-src', "data:text/plain;base64,#{Base64.strict_encode64(diagram_src)}")
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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