FEATURE: Onebox local categories (#11311)

* FEATURE: onebox for local categories

This commit adjusts the category onebox to look more like the category boxes do on the category page.

Co-authored-by: Jordan Vidrine <jordan@jordanvidrine.com>

lib/onebox/templates/discourse_category_onebox.mustache

@@ -0,0 +1,33 @@
+<aside class="onebox" style="border-left: 5px solid #{{color}}">
+  <article class="onebox-body category-onebox">
+    {{#logo_url}}
+      <img src="{{logo_url}}" class="thumbnail" />
+    {{/logo_url}}
+    <h3>
+      <a class="badge-wrapper bullet" href="{{url}}">
+        <span class="clear-badge"><span>{{{name}}}</span></span>
+      </a>
+    </h3>
+    {{#description}}
+      <div>
+        <span class="description">
+          <p>{{{description}}}</p>
+        </span>
+      </div>
+    {{/description}}
+    {{#has_subcategories}}
+      <div class="subcategories">
+        {{#subcategories}}
+          <span class="subcategory">
+            <a class="badge-wrapper bullet" href="{{url}}">
+              <span class="badge-category-bg" style="background-color: #{{{color}}}"></span>
+              <span class="badge-category clear-badge"><span class="category-name">{{{name}}}</span></span>
+            </a>
+          </span>
+        {{/subcategories}}
+      </div>
+      <div class="clearfix"></div>
+    {{/has_subcategories}}
+  </article>
+  <div class="clearfix"></div>
+</aside>

lib/oneboxer.rb

@@ -188,6 +188,7 @@ module Oneboxer
       when "uploads" then local_upload_html(url)
       when "topics"  then local_topic_html(url, route, opts)
       when "users"   then local_user_html(url, route)
+      when "list"    then local_category_html(url, route)
       end
 
     html = html.presence || "<a href='#{url}'>#{url}</a>"
@@ -293,6 +294,25 @@ module Oneboxer
     end
   end
 
+  def self.local_category_html(url, route)
+    return unless route[:category_slug_path_with_id]
+    category = Category.find_by_slug_path_with_id(route[:category_slug_path_with_id])
+
+    if Guardian.new.can_see_category?(category)
+      args = {
+        url: category.url,
+        name: category.name,
+        color: category.color,
+        logo_url: category.uploaded_logo&.url,
+        description: category.description,
+        has_subcategories: category.subcategories.present?,
+        subcategories: category.subcategories.collect { |sc| { name: sc.name, color: sc.color, url: sc.url } }
+      }
+
+      Mustache.render(template("discourse_category_onebox"), args)
+    end
+  end
+
   def self.blocked_domains
     SiteSetting.blocked_onebox_domains.split("|")
   end

spec/requests/onebox_controller_spec.rb

@@ -188,5 +188,28 @@ describe OneboxController do
       get "/onebox.json", params: { url: url }
       expect(response.body).to include('blockquote')
     end
+
+    context 'local categories' do
+      fab!(:category) { Fabricate(:category) }
+
+      it 'oneboxes a public category' do
+        get "/onebox.json", params: { url: category.url }
+        expect(response.body).to include('aside')
+      end
+
+      it 'includes subcategories' do
+        subcategory = Fabricate(:category, name: "child", parent_category_id: category.id)
+
+        get "/onebox.json", params: { url: subcategory.url }
+        expect(response.body).not_to include('subcategories')
+      end
+
+      it 'does not onebox restricted categories' do
+        staff_category = Fabricate(:private_category, group: Group[:staff])
+
+        get "/onebox.json", params: { url: staff_category.url }
+        expect(response.body).not_to include('aside')
+      end
+    end
   end
 end