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# frozen_string_literal: true
require "nokogiri"
require "asciidoctor_plantuml/plantuml"
module Banzai
module Filter
# HTML that replaces all `lang plantuml` tags with PlantUML img tags.
#
class PlantumlFilter < HTML::Pipeline::Filter
prepend Concerns::PipelineTimingCheck
def call
return doc unless settings.plantuml_enabled? && doc.at_xpath(lang_tag)
Gitlab::Plantuml.configure
doc.xpath(lang_tag).each do |node|
img_tag = Nokogiri::HTML::DocumentFragment.parse(
Asciidoctor::PlantUml::Processor.plantuml_content(node.content, {})).css('img').first
next if img_tag.nil?
img_tag.set_attribute('data-diagram', 'plantuml')
img_tag.set_attribute('data-diagram-src', "data:text/plain;base64,#{Base64.strict_encode64(node.content)}")
node.parent.replace(img_tag)
end
doc
end
private
def lang_tag
@lang_tag ||= Gitlab::Utils::Nokogiri
.css_to_xpath('pre[data-canonical-lang="plantuml"] > code, pre > code[data-canonical-lang="plantuml"]').freeze
end
def settings
Gitlab::CurrentSettings.current_application_settings
end
end
end
end
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