FEATURE: add RSS feed for badge pages

app/controllers/badges_controller.rb

@@ -39,6 +39,8 @@ class BadgesController < ApplicationController
 
     params.require(:id)
     @badge = Badge.enabled.find(params[:id])
+    @rss_title = I18n.t('rss_description.badge', display_name: @badge.display_name, site_title: SiteSetting.title)
+    @rss_link = "#{Discourse.base_url}/badges/#{@badge.id}/#{@badge.slug}"
 
     if current_user
       user_badge = UserBadge.find_by(user_id: current_user.id, badge_id: @badge.id)
@@ -49,9 +51,11 @@ class BadgesController < ApplicationController
 
     serialized = MultiJson.dump(serialize_data(@badge, BadgeSerializer, root: "badge", include_long_description: true))
     respond_to do |format|
+      format.rss do
+        @rss_description = @badge.long_description
+      end
       format.html do
         store_preloaded "badge", serialized
-        render :show
       end
       format.json { render json: serialized }
     end

app/views/badges/show.html.erb

@@ -1,3 +1,4 @@
 <% content_for :head do %>
   <%= raw crawlable_meta_data(title: I18n.t('badges.badge_title_metadata', display_name: @badge.display_name, site_title: SiteSetting.title), description: @badge.long_description) %>
+  <%= auto_discovery_link_tag(:rss, "#{@rss_link}.rss", title: @rss_title) %>
 <% end %>

app/views/badges/show.rss.erb

@@ -0,0 +1,21 @@
+<?xml version="1.0" encoding="UTF-8" ?>
+<rss version="2.0" xmlns:discourse="http://www.discourse.org/" xmlns:atom="http://www.w3.org/2005/Atom" xmlns:dc="http://purl.org/dc/elements/1.1/">
+  <channel>
+    <% lang = SiteSetting.find_by_name('default_locale').try(:value) %>
+    <% site_email = SiteSetting.find_by_name('contact_email').try(:value) %>
+    <title><%= @rss_title %></title>
+    <link><%= @rss_link %></link>
+    <description><![CDATA[<%= @rss_description %>]]></description>
+    <% if @badge.user_badges.first.present? %>
+      <atom:link href="<%= "#{@rss_link}.rss" %>" rel="self" type="application/rss+xml" />
+      <% @badge.user_badges.last(50).reverse_each do |user_badge| %>
+        <item>
+          <title><![CDATA[<%= "@#{user_badge.user.username}#{" #{user_badge.user.name}" if (user_badge.user.name.present? && SiteSetting.enable_names?)}" -%>]]></title>
+          <discourse:grantedAt><%= user_badge.granted_at.rfc2822 %></discourse:grantedAt>
+          <discourse:grantedBy><![CDATA[<%= "@#{user_badge.granted_by.username}#{" #{user_badge.granted_by.name}" if (user_badge.granted_by.name.present? && SiteSetting.enable_names?)}" -%>]]></discourse:grantedBy>
+          <guid><%= "#{@rss_link}?username=#{user_badge.user.username}" %></guid>
+        </item>
+      <% end %>
+    <% end %>
+  </channel>
+</rss>

config/locales/server.en.yml

@@ -232,6 +232,7 @@ en:
   num_participants: "Participants:"
   read_full_topic: "Read full topic"
   private_message_abbrev: "Msg"
+
   rss_description:
     latest: "Latest topics"
     hot: "Hot topics"
@@ -249,6 +250,8 @@ en:
     user_posts: "Latest posts by @%{username}"
     user_topics: "Latest topics by @%{username}"
     tag: "Tagged topics"
+    badge: "%{display_name} badge on %{site_title}"
+
   too_late_to_edit: "That post was created too long ago. It can no longer be edited or deleted."
   revert_version_same: "The current version is same as the version you are trying to revert to."
 

spec/controllers/badges_controller_spec.rb

@@ -33,5 +33,11 @@ describe BadgesController do
       get :show, id: badge.id, format: :json
       expect(user_badge.notification.reload.read).to eq(true)
     end
+
+    it 'renders rss feed of a badge' do
+      get :show, id: badge.id, format: :rss
+      expect(response.status).to eq(200)
+      expect(response.content_type).to eq('application/rss+xml')
+    end
   end
 end