59 lines
1.9 KiB
Ruby
59 lines
1.9 KiB
Ruby
# frozen_string_literal: true
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require "nokogiri"
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require "asciidoctor/extensions/asciidoctor_kroki/extension"
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module Banzai
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module Filter
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# HTML that replaces all diagrams supported by Kroki with the corresponding img tags.
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# If the source content is large then the hidden attribute is added to the img tag.
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class KrokiFilter < HTML::Pipeline::Filter
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MAX_CHARACTER_LIMIT = 2000
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def call
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return doc unless settings.kroki_enabled
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diagram_selectors = ::Gitlab::Kroki.formats(settings)
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.map { |diagram_type| %(pre[lang="#{diagram_type}"] > code) }
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.join(', ')
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xpath = Gitlab::Utils::Nokogiri.css_to_xpath(diagram_selectors)
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return doc unless doc.at_xpath(xpath)
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diagram_format = "svg"
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doc.xpath(xpath).each do |node|
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diagram_type = node.parent['lang']
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diagram_src = node.content
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image_src = create_image_src(diagram_type, diagram_format, diagram_src)
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img_tag = Nokogiri::HTML::DocumentFragment.parse(%(<img src="#{image_src}" />))
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img_tag = img_tag.children.first
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unless img_tag.nil?
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lazy_load = diagram_src.length > MAX_CHARACTER_LIMIT
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img_tag.set_attribute('hidden', '') if lazy_load
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img_tag.set_attribute('class', 'js-render-kroki')
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img_tag.set_attribute('data-diagram', node.parent['lang'])
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img_tag.set_attribute('data-diagram-src', "data:text/plain;base64,#{Base64.strict_encode64(node.content)}")
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node.parent.replace(img_tag)
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end
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end
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doc
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end
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private
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def create_image_src(type, format, text)
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::AsciidoctorExtensions::KrokiDiagram.new(type, format, text)
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.get_diagram_uri(settings.kroki_url)
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end
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def settings
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Gitlab::CurrentSettings.current_application_settings
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end
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end
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end
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end
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