Add onceoff job to backfill oneboxes

app/jobs/onceoff/grant_onebox.rb

@@ -0,0 +1,35 @@
+module Jobs
+
+  class GrantOnebox < Jobs::Onceoff
+    sidekiq_options queue: 'low'
+
+    def execute_onceoff(args)
+      to_award = {}
+
+      Post.secured(Guardian.new)
+          .select(:id, :created_at, :raw, :user_id)
+          .visible
+          .public_posts
+          .where("raw like '%http%'")
+          .find_in_batches do |group|
+
+        group.each do |p|
+          # Note we can't use `p.cooked` here because oneboxes have been cooked out
+          cooked = PrettyText.cook(p.raw)
+          doc = Nokogiri::HTML::fragment(cooked)
+          if doc.search('a.onebox').size > 0
+            to_award[p.user_id] ||= { post_id: p.id, created_at: p.created_at }
+          end
+        end
+
+      end
+
+      badge = Badge.find(Badge::FirstOnebox)
+      to_award.each do |user_id, opts|
+        BadgeGranter.grant(badge, User.find(user_id), opts)
+      end
+    end
+
+  end
+
+end