FIX: Support for cookies in onebox redirects

Gemfile

@@ -48,7 +48,7 @@ gem 'onebox'
 gem 'http_accept_language', '~>2.0.5', require: false
 
 gem 'ember-rails', '0.18.5'
-gem 'ember-source', '2.10.0'
+gem 'ember-source'
 gem 'ember-handlebars-template', '0.7.5'
 gem 'barber'
 gem 'babel-transpiler'

Gemfile.lock

@@ -214,7 +214,7 @@ GEM
     omniauth-twitter (1.3.0)
       omniauth-oauth (~> 1.1)
       rack
-    onebox (1.8.10)
+    onebox (1.8.11)
       fast_blank (>= 1.0.0)
       htmlentities (~> 4.3)
       moneta (~> 1.0)
@@ -409,7 +409,7 @@ DEPENDENCIES
   email_reply_trimmer (= 0.1.6)
   ember-handlebars-template (= 0.7.5)
   ember-rails (= 0.18.5)
-  ember-source (= 2.10.0)
+  ember-source
   excon
   execjs
   fabrication (= 2.9.8)

lib/oneboxer.rb

@@ -144,9 +144,17 @@ module Oneboxer
     def self.onebox_raw(url)
 
       Rails.cache.fetch(onebox_cache_key(url), expires_in: 1.day) do
-        uri = FinalDestination.new(url).resolve
+        fd = FinalDestination.new(url)
+        uri = fd.resolve
         return blank_onebox if uri.blank? || SiteSetting.onebox_domains_blacklist.include?(uri.hostname)
-        options = { cache: {}, max_width: 695, sanitize_config: Sanitize::Config::DISCOURSE_ONEBOX }
+        options = {
+          cache: {},
+          max_width: 695,
+          sanitize_config: Sanitize::Config::DISCOURSE_ONEBOX
+        }
+
+        options[:cookie] = fd.cookie if fd.cookie
+
         r = Onebox.preview(url, options)
         { onebox: r.to_s, preview: r.try(:placeholder_html).to_s }
       end