FEATURE: Onebox for news.ycombinator.com (#15781)

lib/onebox/engine.rb

@@ -210,3 +210,4 @@ require_relative "engine/kaltura_onebox"
 require_relative "engine/reddit_media_onebox"
 require_relative "engine/google_drive_onebox"
 require_relative "engine/facebook_media_onebox"
+require_relative "engine/hackernews_onebox"

lib/onebox/engine/hackernews_onebox.rb

@@ -0,0 +1,48 @@
+# frozen_string_literal: true
+
+module Onebox
+  module Engine
+    class HackernewsOnebox
+      include Engine
+      include LayoutSupport
+      include JSON
+
+      REGEX = /^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 unless %w{story comment}.include?(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

lib/onebox/templates/hackernews.mustache

@@ -0,0 +1,18 @@
+<h3><a href="{{link}}" target="_blank" rel="noopener">{{title}}</a></h3>
+
+{{#description}}
+  <p>{{description}}</p>
+{{/description}}
+
+
+<p>
+  {{#data_1}}
+  <span class="label1">{{data_1}} points</span> —
+  {{/data_1}}
+  {{#data_2}}
+  <span class="label2">{{data_2}} comments</span> —
+  {{/data_2}}
+  <a href="https://news.ycombinator.com/user?id={{author}}" class="author" target="_blank" rel="noopener">{{author}}</a> —
+  <a href="{{link}}" class="timestamp" target="_blank" rel="noopener">{{timestamp}}</a>
+</p>
+