Support `embeddable_host` values that contain a HTTP/HTTPs protocol

app/controllers/embed_controller.rb

@@ -48,8 +48,8 @@ class EmbedController < ApplicationController
     def ensure_embeddable
 
       if !(Rails.env.development? && current_user.try(:admin?))
-        raise Discourse::InvalidAccess.new('embeddable host not set') if SiteSetting.embeddable_host.blank?
-        raise Discourse::InvalidAccess.new('invalid referer host') if URI(request.referer || '').host != SiteSetting.embeddable_host
+        raise Discourse::InvalidAccess.new('embeddable host not set') if SiteSetting.normalized_embeddable_host.blank?
+        raise Discourse::InvalidAccess.new('invalid referer host') if URI(request.referer || '').host != SiteSetting.normalized_embeddable_host
       end
 
       response.headers['X-Frame-Options'] = "ALLOWALL"

app/models/site_setting.rb

@@ -56,6 +56,11 @@ class SiteSetting < ActiveRecord::Base
     @anonymous_menu_items ||= Set.new Discourse.anonymous_filters.map(&:to_s)
   end
 
+  def self.normalized_embeddable_host
+    return embeddable_host if embeddable_host.blank?
+    embeddable_host.sub(/^https?\:\/\//, '')
+  end
+
   def self.anonymous_homepage
     top_menu_items.map { |item| item.name }
                   .select { |item| anonymous_menu_items.include?(item) }

lib/topic_retriever.rb

@@ -12,7 +12,7 @@ class TopicRetriever
   private
 
     def invalid_host?
-      SiteSetting.embeddable_host != URI(@embed_url).host
+      SiteSetting.normalized_embeddable_host != URI(@embed_url).host
     rescue URI::InvalidURIError
       # An invalid URI is an invalid host
       true
@@ -52,4 +52,4 @@ class TopicRetriever
       TopicEmbed.import_remote(user, @embed_url)
     end
 
-end
+end

spec/components/topic_retriever_spec.rb

@@ -7,13 +7,13 @@ describe TopicRetriever do
   let(:topic_retriever) { TopicRetriever.new(embed_url) }
 
   it "does not call perform_retrieve when embeddable_host is not set" do
-    SiteSetting.expects(:embeddable_host).returns(nil)
+    SiteSetting.stubs(:embeddable_host).returns(nil)
     topic_retriever.expects(:perform_retrieve).never
     topic_retriever.retrieve
   end
 
   it "does not call perform_retrieve when embeddable_host is different than the host of the URL" do
-    SiteSetting.expects(:embeddable_host).returns("eviltuna.com")
+    SiteSetting.stubs(:embeddable_host).returns("eviltuna.com")
     topic_retriever.expects(:perform_retrieve).never
     topic_retriever.retrieve
   end
@@ -26,7 +26,7 @@ describe TopicRetriever do
 
   context "with a valid host" do
     before do
-      SiteSetting.expects(:embeddable_host).returns("eviltrout.com")
+      SiteSetting.stubs(:embeddable_host).returns("eviltrout.com")
     end
 
     it "calls perform_retrieve if it hasn't been retrieved recently" do

spec/models/site_setting_spec.rb

@@ -30,6 +30,23 @@ describe SiteSetting do
     end
   end
 
+  describe "normalized_embeddable_host" do
+    it 'returns the `embeddable_host` value' do
+      SiteSetting.stubs(:embeddable_host).returns("eviltrout.com")
+      SiteSetting.normalized_embeddable_host.should == "eviltrout.com"
+    end
+
+    it 'strip http from `embeddable_host` value' do
+      SiteSetting.stubs(:embeddable_host).returns("http://eviltrout.com")
+      SiteSetting.normalized_embeddable_host.should == "eviltrout.com"
+    end
+
+    it 'strip https from `embeddable_host` value' do
+      SiteSetting.stubs(:embeddable_host).returns("https://eviltrout.com")
+      SiteSetting.normalized_embeddable_host.should == "eviltrout.com"
+    end
+  end
+
   describe 'topic_title_length' do
     it 'returns a range of min/max topic title length' do
       SiteSetting.topic_title_length.should ==