How to custom render external links in Action Text?

rubyonrails-talk
3

Actually I’ve managed to do it server-side as follows, don’t know if there’s a simpler way:

# config/initializers/action_text.rb
module ActionText
  Rails.application.reloader.to_prepare do
    ContentHelper.allowed_attributes += ["target", "rel"]
    unless ContentHelper.included_modules.include?(ContentHelperMonkeyPatch)
      ContentHelper.include(ContentHelperMonkeyPatch)
    end
    unless Content.included_modules.include?(ContentMonkeyPatch)
      Content.include(ContentMonkeyPatch)
    end
  end
end

# lib/action_text/content_helper_monkey_patch.rb
module ActionText
  module ContentHelperMonkeyPatch
    def custom_render_action_text(content)
      local_base_url = request.base_url
      self.prefix_partial_path_with_controller_namespace = false
      rendered = render_action_text_attachments(content).render_links(local_base_url)
      sanitize_action_text_content(rendered)
    end
  end
end

# lib/action_text/content_monkey_patch.rb
module ActionText
  module ContentMonkeyPatch
    def render_links(local_base_url)
      content = fragment.replace("a") do |node|
        unless node.attribute("href")&.value&.start_with?(local_base_url)
          node.set_attribute("target", "_blank")
          node.set_attribute("rel", "noreferrer noopener")
          node.set_attribute("class", "external")
        end
        node
      end
      self.class.new(content, canonicalize: false)
    end
  end
end

# app/views/action_text/content/_layout.html.erb
<div class="trix-content">
  <%= custom_render_action_text(content) %>
</div>
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