discourse/lib/onebox/engine/hackernews_onebox.rb

# frozen_string_literal: true

module Onebox
  module Engine
    class HackernewsOnebox
      include Engine
      include LayoutSupport
      include JSON

      REGEX = %r{^https?://news\.ycombinator\.com/item\?id=(?<item_id>\d+)}

      matches_regexp(REGEX)

      # This is their official API: https://blog.ycombinator.com/hacker-news-api/
      def url
        "https://hacker-news.firebaseio.com/v0/item/#{match[:item_id]}.json"
      end

      private

      def match
        @match ||= @url.match(REGEX)
      end

      def data
        return nil if %w[story comment].exclude?(raw["type"])

        html_entities = HTMLEntities.new
        data = {
          link: @url,
          title: Onebox::Helpers.truncate(raw["title"], 80),
          favicon: "https://news.ycombinator.com/y18.gif",
          timestamp: Time.at(raw["time"]).strftime("%-l:%M %p - %-d %b %Y"),
          author: raw["by"],
        }

        data["description"] = html_entities.decode(
          Onebox::Helpers.truncate(raw["text"], 400),
        ) if raw["text"]

        if raw["type"] == "story"
          data["data_1"] = raw["score"]
          data["data_2"] = raw["descendants"]
        end

        data
      end
    end
  end
end